User's Manual

8-CHANNEL MIXING CONSOLE WITH DIGITAL EFFECTS
LTO www.altoproaudio.com Version 1.0 August 2003

English

SAFETY RELATED SYMBOLS

CAUTION

RISK OF ELECTRIC SHOCK DO NOT OPEN
the recommended fuse type as indicated in this manual. Do not short-circuit the fuse holder. Before replacing the fuse, make sure that the product is OFF and disconnected from the AC outlet.

Protective Ground

This symbol, wherever used, alerts you to the presence of un-insulated and dangerous voltages within the product enclosure. These are voltages that may be sufficient to constitute the risk of electric shock or death. This symbol, wherever used, alerts you to important operating and maintenance instructions. Please read. Protective Ground Terminal AC mains (Alternating Current) Hazardous Live Terminal ON: Denotes the product is turned on.
Before turning the product ON, make sure that it is connected to Ground. This is to prevent the risk of electric shock. Never cut internal or external Ground wires. Likewise, never remove Ground wiring from the Protective Ground Terminal.

Operating Conditions

Always install in accordance with the manufacturer's instructions. To avoid the risk of electric shock and damage, do not subject this product to any liquid/rain or moisture. Do not use this product when in close proximity to water. Do not install this product near any direct heat source. Do not block areas of ventilation. Failure to do so could result in fire. Keep product away from naked flames.
OFF: Denotes the product is turned off. WARNING Describes precautions that should be observed to prevent the possibility of death or injury to the user. CAUTION Describes precautions that should be observed to prevent damage to the product.
IMPORTANT SAFETY INSTRUCTIONS
Read these instructions Follow all instructions Keep these instructions. Do not discard. Heed all warnings. Only use attachments/accessories specified by the manufacturer.

Power Cord and Plug

WARNING
Power Supply Ensure that the mains source voltage (AC outlet) matches the voltage rating of the product. Failure to do so could result in damage to the product and possibly the user. Unplug the product before electrical storms occur and when unused for long periods of time to reduce the risk of electric shock or fire. External Connection Always use proper ready-made insulated mains cabling (power cord). Failure to do so could result in shock/death or fire. If in doubt, seek advice from a registered electrician. Do Not Remove Any Covers Within the product are areas where high voltages may present. To reduce the risk of electric shock do not remove any covers unless the AC mains power cord is removed. Covers should be removed by qualified service personnel only. No user serviceable parts inside.
Do not tamper with the power cord or plug. These are designed for your safety. Do not remove Ground connections! If the plug does not fit your AC outlet seek advice from a qualified electrician. Protect the power cord and plug from any physical stress to avoid risk of electric shock. Do not place heavy objects on the power cord. This could cause electric shock or fire.

Cleaning

When required, either blow off dust from the product or use a dry cloth. Do not use any solvents such as Benzol or Alcohol. For safety, keep product clean and free from dust.

Servicing

Refer all servicing to qualified service personnel only. Do not perform any servicing other than those instructions contained within the User's Manual.
To prevent fire and damage to the product, use only

PREFACE

Dear Customer: Thanks for choosing LTO L-8 8-Channel Mixing Console With Digital Effects and thanks for choosing one of the results of LTO AUDIO TEAM's work and researches. For our LTO AUDIO TEAM, music and sound more than a job. are first of all passion and let us say. our obsession!

We have been designing professional audio products for a long time in cooperation with some of the major brands in the world in the audio field. The LTO line presents unparalleled analogue and digital products made by Musicians for Musicians in our R&D centers in Italy, Netherlands, United Kingdom and a large range of state of the art algorithms which have been developed by our Software Team for the last 7 years. Because we are convinced you are the most important member of LTO AUDIO TEAM and the one confirming the quality of our job, we like to share with you our work and our dreams paying attention to your suggestions and your comments. Following this idea we create our products and we will create the new ones! From our side, we guarantee you and we will guarantee you also in future the best quality, the best fruits of our continuous researches and the best prices. Our LTO L-8 8-Channel Mixing Console with Digital Effects has 4 mono (these are provided with Ultra Low Noise microphone preamplifiers and Phantom Power at +48 Volt) and 2 stereo input channels, and each of them is provided with a 3 bands graphic equliser for HI, MID and LOW controls. It is specifically designed for professional appliance. To our surprise, it provides 24 bits digital stereo effect processor with 256 presets and small and exquisite modeling. Seeing is believing, let's meet the LTO L-8. Nothing else to add, but we would like to thank all the people that made the LTO L-8 8-Channel Mixing Console with Digital Effects a reality available to our customers, and thank our designers and all the LTO staff, people who make possible the realization of products containing our idea of music and sound and are ready to support you, our customers, in the best way, conscious that you are our most important member.
Thank you very much LTO AUDIO TEAM

TABLE OF CONTENTS

1.INTRODUCTION.....4 2.FEATURES.....5 3.READY TO START?.....6 4.CONTROL ELEMENTS.....7 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 The mono MIC/LINE channels....8 INPUT LEVEL setting.....8 LOW-CUT FILTER.....8 STEREO INPUTS.....9 The 3 BANDS EQUALISER....9 AUX SEND.....10 PAN.....10 PEAK......10 LEVEL.....10

4.10 INSERT.....10 4.11 MASTER SECTION.....11 -MAIN MIX LEVEL -LED METER -2 TRACK signal path -AUX RETURN -POWER LED -PHANTOM LED -PHONES/CONTROL ROOM -24 BIT DIGITAL EFFECTS -DFX FOOTSWITCH -PHONES -STEREO AUX RETURN -AUX SEND 1 AND 2 -2-TRACK IN/OUT 4.12 REAR PANEL.....13 -POWER -PHANTOM -AC INLET WITH FUSE HOLDER -MAIN MIX OUTPUT -CONTROL ROOM OUTPUT 5.INSTALLATION AND CONNECTION....14 6.FOR THE EXPERTS WHO WANT TO KNOW MORE...17 7. PRESET LIST.....18 8.SYSTEM BLOCK DIAGRAMS.....25 9.TECHNICAL SPECIFICATION....26 10.WARRANTY.....28

1. INTRODUCTION

Thank you very much for expressing your confidence in LTO products by purchasing LTO L-Channel Mixing Console with Digital Effects. The L-Channel Mixing Console with Digital Effects is a professional compact mixer. You will get the smooth, accurate more natural and open sound from this apparatus, and it is really ideal for small gigs, recording and fixed PA installations. The L-Channel Mixing Console with Digital Effects is packed with feature that can not be found in other consoles of its size: 4 mono (these are provided with Ultra Low Noise microphone preamplifiers and Phantom Power at +48 Volt) and 2 stereo input channels, and each of them is provided with a 3 bands graphic equaliser for HI, MID and LOW controls; 24 bit effects processor; 256 effects (16 presets 16 variations); 2 AUX sends with separate level control on each channel; highly accurate 12-segment bar graph meters and ultra low noise discrete MIC pre-amps with +48V Phantom power and 2-Track inputs assignable to main mix, control room / headphone outputs. Your L-8 is very easy to operate but we advise you to go through each Section of this Manual carefully. In this way you will get the best out of your L-8.

2. FEATURES

The L-Channel Mixing Console with Digital Effects is designed for professional appliance. It will provide the following features: 5 MIC input channels with gold plated XLRs and balanced LINE input 2 stereo input channels with balanced TRS jacks Ultra-low noise discrete MIC pre-amps with +48V Phantom power Extremely high headroom offering more dynamic range Balanced inputs for highest signal integrity Warm, natural 3-band EQ on each channel 24 bit digital effects processor 256 effects (16 presets 16 variations) Effect on/off by means of MUTE switch or a footswitch connected to the DFX FOOTSWITCH Switch-able Low-cut filter on each mono channel Peak LED on each channel AUX send 2 switch-able to PRE/POST fader AUX send 1/2 per channel for external effects and monitoring Control room and headphone outputs 2-Track inputs assignable to main mix, control room / headphone outputs Highly accurate 12-segment bar graph meters Inserts on MIC channels

3. READY TO START?

3.1 Please check the AC Voltage available in your Country before connecting your L-8 to the AC socket. 3.2 Be sure that the main power switch is turned off before connecting the Mixer to the AC socket. Also, you should make sure that all Input and Output Controls are turned down. This will avoid damages to your speakers and avoid excessive noise. 3.3 Before turning on the L-8 you shall connect it to a power amplifier and turn-on the mixer BEFORE the power amplifier. Once you have finished your working session you shall turn the mixer off AFTER the power amplifier. 3.4 Before disconnecting the L-8 always turn-off the Power switch. 3.5 Do not use solvents to clean your L-8. A dry and clean cloth will be OK.

4. CONTROL ELEMENTS

STEREO AUX RETURN

LEFT(MONO) RIGHT

AUX SEND 1 L

2-TRACK IN/OUT

LTO 8-CHANNEL MIXING CONSOLE WITH DIGITAL EFFECTS

TAPE IN

BAL OR UNBAL BAL OR UNBAL BAL OR UNBAL BAL OR UNBAL

TAPE OUT

LINE IN 5/6

LINE IN 7/8

DFX FOOTSWITCH

LINE IN 1 TRIM

LINE IN 2 TRIM

LINE IN 3 TRIM

LINE IN 4 TRIM
LEFT (MONO) MIC (MONO) +15dB 0dB -45dB LINE 60dB MIC LOW CUT 75Hz 18dB/Oct +15dB 0dB -45dB LINE 60dB MIC LOW CUT 75Hz 18dB/Oct +15dB 0dB -45dB LINE 60dB MIC LOW CUT 75Hz 18dB/Oct +15dB 0dB -45dB LINE 60dB MIC LOW CUT 75Hz 18dB/Oct

LEFT (MONO)

RIGHT RIGHT

PHONES

60dB MIC

HI 12kHz

PRESETS

MID 2.5kHz

-+12 -+12

LOW 80Hz -15 +-15 +15 0

LOW 80Hz -15 +15 0

LOW 80Hz

1. VOCAL 1 2. VOCAL 2 3. LARGE HALL 4. SMALL HALL 5. LARGE ROOM 6. SMALL ROOM 7. PLATE 8. TAPE REVERB 9. SPRING REVERB 10. MONO DELAY 11. STEREO DELAY 12. FLANGER 13. CHORUS 14. REVERB + DELAY 15. REVERB + FLANGER 16. REVERB + CHORUS

VARIATIONS DFX MUTE

CLIP 10 7

POST (PRE)

+15 AUX2/DFX TO AUX 1 0

PHANTOM

+15 AUX RTN 1 0

2TK TO MIX

-10 -20

LEFT 0

+15 AUX RTN 2 (DFX)

2TK TO CTRL ROOM

OUTPUT LEVEL

PHONES /

CONTROL ROOM

MAIN MIX LEVEL

4.1 The mono MIC/LINE channels
These are Channel 1 through Channel 4. You can connect balanced, low impedance microphones to the XLR socket. On the 1/4" phone jack you can connect either a microphone or a line level instrument. You shall never connect an unbalanced microphone to the XLR socket if you do not want to damage both the Microphone and the Mixer. 48 Volt phantom power

BAL OR UNBAL

It is available only to the XLR Mic sockets. Never plug in a microphone when phantom power is already on. Before turning phantom power on, make sure that all faders are all the way down. In this way you will protect your Stage Monitors and Main Loudspeakers.

4.2 INPUT LEVEL setting

+15dB 0dB
-45dB LINE 60dB MIC LOW CUT 75Hz 18dB/Oct
This Control is provided with 2 different indication rings: One is for the Microphone and the other for the Line levels. When you use a microphone you shall read the OUTSIDE ring (0-60 dB), When you use a Line level instrument you shall read the INSIDE ring (+15~-45 dB). For optimum operation you shall set this control in a way that the peak LED will blink also occasionally in order to avoid distortion on the input channel.

POWER ON

4.3 LOW-CUT FILTER
By pressing this button you will activate a 75 Hz low frequency filter with a slope of 18 dB per octave. You can use this function to reduce hum and stage rumble when using microphones.

4.4 STEREO INPUTS

These are Channel 5 through 8. They are organised in stereo pair and they are provided with 1/4" TRS phone sockets. If you connect only the left jack, the input will operate in mono mode.

LEFT (MONO) MIC (MONO)

4.5 The 3 BANDS EQUALISER
A 3-band equaliser is provided for all input channels with a wide range of frequency adjustment.

4.5.1 HI

This is the Treble control. You can use it to get rid of high frequency noises or to boost the sound of cymbals or the high harmonics of the human voice. The gain range goes from -15dB to +15dB with a center frequency of 12 kHz.

MID 2.5kHz -+12

4.5.2 MID

-15 +15 0

This is the Midrange control. It can affect most fundamental frequencies of all musical instruments and human voice. An attentive use of this control will give you any very wide panorama of sound effects. The gain range goes from -12dB to +12dB and the center frequency is 2.5 kHz.

4.5.3 LOW

This is the Bass control. Boost male voice or kickdrum and bass guitar. Your system will sound much bigger than what it is. The gain range goes from -15dB to +15dB and the center frequency is 80 Hz.

4.6 AUX SEND

These two controls are used to adjust the level of the signal sent to AUX buses, and their adjustable range goes from to +15dB. AUX1 is configured as PRE-FADER, so, generally, it can be used for monitor application. While AUX2 is configured as POST-FADER, therefore, most of the times, it will be used for effects and processors input, however, you can also changed it to PRE-FADER configuration according to the specific application. (For more detail, please see chapter 6.) In this typical compact unit, excluding sending out directly to the external effect or processor equipment, AUX SEND2 will also be sent to the internal onboard effect module.

-15 -15

LOW 80Hz +15 0

4.7 PAN

This is the PANORAMA control, or balance control. You can adjust the stereo image of the signal via this Control. Keep this control in center position and your signal will be positioned in the middle of stage. Turn this control fully counterclockwise and the signal will be present only on the left speaker and vice-versa. Of course a wide number of intermediate positions is available.

4.8 PEAK

Inside your L-8 the audio signal is monitored in several different stages and then sent to the PEAK Led. When this Led blinks, it warns you that you are reaching signal saturation and possible distortion. The PEAK Led will blink with a level that is 6dB before actual clipping.

4.9 LEVEL

This Control will adjust the overall level of this channel and set the amount of signal sent to the Main output.

4.10 INSERT

Insert points are provided for the Mono Mic Channels. When you insert a jack in the insert socket, the signal will be taken out after the Input Gain Control (Trim), sent to an external processor such a compressor-limiter, and returned into the channel strip immediately before the EQ section. Of course, the jacks used must be stereo (Tip Send/ Ring Return).

CHANNEL INSERT

(PRE-FADER/PRE-EQ TIP SEND/RING RETURN)

4.11 MASTER SECTION

- MAIN MIX LEVEL
This Control sets the amount of signal sent either to the Main Out socket or to the Tape Output.

- LED METER

This stereo 12 segments Led Meter will indicate the level of the overall output signal.

- 2 TRACK signal path

If you push down the 2TK TO CONTROL ROOM button, the 2 TRACK IN signal will be routed into the Control Room output and the level will be adjusted by the Control Room knob nearby the Main MIX LEVEL knob. If you push the 2TR TO MIX button the 2 TRACK IN signal will be routed into the MAIN output and will be adjusted by the MAIN MIX LEVEL knob.

- AUX RETURN

As implied in the name, the Auxiliary Returns are used to 'return' the signal from the external effects or processors to the main mix, but, most of the times, it can also be worked as the additional stereo line inputs. In this typical compact unit: AUX RETURN1 is configured to be assigned to the main mix bus permanently, for mono application, only use the left input jack. But for AUX RETURN2, instead of assigning the returned signal to main mix bus, it can also to AUX1 bus, and in this case, adjust AUX2/DFX TO AUX1 knob (18) to control the input level. Normally, AUX RETURN2 is connected rightly with the output of the internal digital effects, but, this signal flow will be broken, if you have any external signal inserted from these two jacks.

- POWER LED

This LED indicates when the Power is on in your L-8.

- PHANTOM LED

This LED indicates when the Phantom Power is switched on.

- PHONES/CONTROL ROOM

This Control sets the amount of signal sent to the Control Room and headphone.
- 24 BIT DIGITAL EFFECTS PRESETS
Adjust this knob to select the right effect you wish to perform. There are total 16 options for you: several kinds of reverb, mono and stereo delay, effects with modulation, and versatile two-effect combination.

VARIATIONS

Since you have selected the preferable effect, the next step, please go with the fine consideration, there are also total 16 variations for each preset, Each variation may be managed by several different factors.

MUTE SWITCH

This switch is used to activate/deactivate the effect facility. Sometimes, you can also use the DFX FOOTSWITCH for convenient operation.

PEAK LED

This LED lights up when the input signal is too strong. In case of the digital effect module being muted, this LED also lights up.

- DFX FOOTSWITCH

This 1/4" phone jack can be used to connect an external footswitch to turn on/off the onboard effect module.

- PHONES

This socket will send out the mix signal to a pair of headphones.

- STEREO AUX RETURN

Use these stereo 1/4" phone socket to return the sound of an effect unit or sound processor to the Main Mix. Alternatively you can use them as an extra auxiliary input.

- AUX SEND

These 1/4" phone sockets are used to send out the signal from the AUX Bus to external devices such as effects and sound processors.

- 2-TRACK IN/OUT Input

Use the Tape input if you wish to listen to your Mix from a Taper Recorder or DAT, you can assign the signal coming form the Taper Recorder either to a pair of studio monitor using the Control Room assignment on the front panel or directly to the Main Mix. Output These RCA jacks will route the main mix into a tape recorder.
4.12 REAR PANEL DESCRIPTION

CAUTION:

MAIN MIX OUTPUT (BAL/UNBAL) RIGHT LEFT
Use only with a 250V fuse
REPLACE WITH THE SAME TYPE FUSE AND RATING DISCONNECT SUPPLY CORD BEFORE CHANGING FUSE WARNING: SHOCK HAZARD - DO NOT OPEN AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR OFF CONTROL ROOM OUTPUT

AC INPUT

EUROPE 210-240V 50Hz Fuse:T250mAL
RATED POWER CONSUMPTION: 25W
USA / Canada 100-120V 60Hz Fuse:T500mAL
UK / Aust 240V 50Hz Fuse:T250mAL

- POWER ON/OFF switch

This switch is used to turn the Main Power ON and OFF.

- PHANTOM ON/OFF switch

This switch will apply +48 Volt Phantom Power only to the 5 XLR microphone inputs. Never connect microphones when the Phantom Power is on already.

- AC INLET WITH FUSE HOLDER
Use it to connect your L-8 to the Main AC with the supplied AC cord. Please check the Voltage available in your Country and make sure the Voltage for your L-8 before attempting to connect your L-8 to the Main AC.

- MAIN MIX OUTPUT

This stereo output is supplied both with XLR and 1/4" jack socket and it is controlled by the Main Mix Level on the front panel. It will send the audio signal to an amplifier. The output level can be varied from - to +15dB.

- CONTROL ROOM OUTPUT

These 1/4" phone sockets will be used to send the signal to Studio Monitor speakers or to a second set of PA.
5. INSTALLATION AND CONNECTION
Ok, you have got to this point you are now in the position to successfully operate your L-8. However, we advise you to read carefully the following section to be the real Master of your own Mix. Not paying attention enough to the Input signal level, to the routing of the signal and the assignment of the signal will result in unwanted distortion, a corrupted signal or no sound at all. So you should follow this procedure for every single channel:
Turn down all Input and Output Gain Controls. Connect phantom powered microphones before switching on the +48Volt Phantom Power switch. If you have a power amplifier connected to your L-8 set the Level of the amplifier at no more than 70%. Now, set the CONTROL ROOM/PHONES level at no more than 50%. In this way you will be able to hear later what you are doing connecting a pair of headphones or a pair of powered studio monitor speakers. Position HI, MID and LOW eq controls on the middle. Position panoramic (PAN) control on the center. With a headphone or studio monitor speakers connected apply a Line Level input signal so that the PEAK Led does not light up. At this point increase the input gain so that the PEAK led will blink occasionally. In this way you will maintain good headroom and ideal dynamic range. Now connect a microphone and ask the singer to sing loud into the microphone. Turn slowly the Gain Control clockwise and have the PEAK Led blink only occasionally. Now repeat the same sequence for all input channels. The Main Led Meter could move up into the red section. In this case you can adjust the overall output level through the MAIN MIX control.
5.1 SOME FINAL TIPS ON WIRING CONFIGURATION
You can connect unbalanced equipment to balanced inputs and outputs. Simply follow these schematics.

Sleeve Strain Clamp

Tip Ring

Ring=Right Signal

Tip=Left Signal
Sleeve=Ground/Screen Use for Headphone, Stereo Return
1/4" Stereo (TRS) Jack Plug

Sleeve

Strain Clamp

Tip=Signal

Sleeve=Ground/Screen Use for Mono Line In, Mono 1/4"Jack Plugs
1/4" Mono (TS) Jack Plug

Ring=Return Signal

Tip=Send Signal

Sleeve=Ground/Screen

Use for Pre-Gain Channel Inserts

2=Hot(+)

1=Ground/Screen
3=Cold(-) Use for Balanced Mic Inputs (For unbalanced use, connect pin 1 to 3)
3=Cold(-) Use for Main output (For unbalanced use, leave pin 3 unconnected)

3-pin XLR Male Plug

(seen from soldering side)

3-pin XLR Line Socket

Ring=Return Signal (Connected together)

To Channel Insert

To Tape or FX Input
'Tapped' Connection Direct Output Lead (Enables the Insert to be used as a Direct Output while maintaining the channel signal flow)

To Processor Input

Sleeve=Ground/Screen Tip
Sleeve Ring Ring=Return Signal

To Processor Output

-Stereo lead for insert Connection (To be used when the processor does not employ a single jack connection for the In/Out Connections)
6. FOR THE EXPERTS WHO WANT TO KNOW MORE
As we have told you previously in this Manual, the Aux Send 2 Control both on Mono and on stereo channels is factory wired as POST-FADER. If you have some skill in electronic components soldering you can modify this setting and have all your AUX sends configured as PRE-FADER.
Aux (PRE) POST Disconnect the POST route (PRE) POST

Aux Solder the PRE route

Before
Modification on mono and stereo channels

7. PRESET LIST

01. VOCAL1 No Pre-delay Rev Time 1.00 1.00 4.50 3.60 1.20 3.60 0.8 1.50 2.40 0.90 1.50 1.00 1.00 2.10 4.50 1.70 Room Size 11 Rev. Type Hall Tape Spring Plate Spring Hall Plate Plate Spring Tape Plate Hall Spring Tape Plate Plate Hi Damp -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12
02. VOCAL2 No Pre-delay Rev Time 1.00 0.80 3.60 1.20 3.60 4.50 1.00 1.00 1.70 4.50 2.10 1.00 1.00 1.50 0.90 2.40 Room Size Rev. Type Spring Plate Hall Spring Plate Spring Tape Hall Plate Plate Tape Spring Hall Plate Tape Spring Hi Damp -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12 -12
03. LARGE HALL No Pre-delay Rev Time 5.40 5.40 5.40 5.40 4.50 4.50 4.50 4.50 Room Size Hi Damp -0.96 -12.00 -0.96 -12.00 -0.96 -12.00 -0.96 -12.00 Rev level 82 82

Room Size Left Delay Right Delay Left F.B. Right F.B. Rev level 80% 80% 80% 80% 80% 80% 80% 80% 90% 90% 90% 90% 90% 90% 90% 90%
15. REVERB+FLANGER No Rev Time 2.90 2.90 2.90 2.90 2.90 2.90 2.90 2.90 1.50 1.50 1.50 1.50 1.50 1.50 1.00 1.00
Room Size Mod. Freq. 2.52 2.25 1.99 1.61 1.22 0.80 0.54 0.16 2.52 2.25 1.99 1.61 1.22 0.80 0.54 0.16 Pitch. Depth Left F.B. Rev level 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90%
16. REVERB+CHORUS No Rev Time 2.90 2.90 2.90 2.90 2.90 2.90 2.90 2.90 1.50 1.50 1.50 1.50 1.50 1.50 1.00 1.00
Room Size Mod. Freq. 4.74 4.12 3.67 3.02 2.63 1.99 1.35 0.50 4.74 4.12 3.67 3.02 2.63 1.99 1.35 0.50 Pitch. Depth Left F.B. Rev level 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90%

8. SYSTEM BLOCK DIAGRAMS

9. TECHNICAL SPECIFICATION

Mono input channels

Microphone input Frequency response Distortion (THD & N) Gain range SNR (Signal to Noise Ratio) Line input Frequency response Distortion (THD & N) Sensitivity range electronically balanced, discrete input configuration 10Hz to 55kHz, + 3dB 0.005% at +4dBu, 1kHz 0dB to 60dB (MIC) 115dB electronically balanced 10Hz to 55kHz, + 3dB 0.005% at +4dBu, 1kHz +15dBu to 45dBu

Stereo input channels

Line input Frequency response Distortion (THD & N) unbalanced 10Hz to 55kHz, + 3dB 0.005% at +4dBu, 1kHz
Impedances Microphone input Channel Insert return All other inputs Tape out All other output Equalization
Hi shelving Mid bell Low shelving Low Cut filter
1.4kOhm 2.5kOhm 10kOhm or greater 1kOhm 120Ohm
+ 15dB @12kHz + 12dB @2.5kHz + 15dB @80Hz 75Hz, 18dB/oct.

DSP SECTION

A/D and D/A converters DSP resolution Type of effects 24 bit 24 bit Hall, Room, Vocal & Plate REVERBS Mono & Stereo DELAY (max DELAY TIME 650ms) Chorus, Flanger & Reverb MODULATIONS REVERB+DELAY, REVERB+CHORUS, REVERB+FLANGER combinations 256 16-position PRESET Selector 16-position VARIATION selector CLIP LED MUTE SWITCH with LED indicator

Presets Controls

Main Mix Section Noise (Bus noise)
Max output AUX Return gain range AUX Sends max out
Fader 0 dB, channels muted: 100dBr (ref.:+4dBu) Fader 0dB, all input channels assigned and set to UNITY gain: 90dBr (ref.:+4dBu) +22dBu balanced XLR, +22dBu unbalanced, 1/4" jacks OFF to +15dB +22dBu
Power supply Main voltage

USA/Canada Europe U.K./Australia
100 120V~, 60Hz 210 240V~, 50Hz 240V~, 50Hz
Power Consumption Fuse Main connection
25 watts 100 120V~ : T500mAL 210 240V~ : T250mAL Standard IEC receptacle
Physical Dimension (W D Net weight Shipping weight
245mm 268mm 3.0Kg (6.62lb) 4.1Kg (9.04lb)

24/73mm (9.64"

10.54"

0.94"/2.87")

10. WARRANTY
1. WARRANTY REGISTRATION CARD To obtain Warranty Service, the buyer should first fill out and return the enclosed Warranty Registration Card within 10 days of the Purchase Date. All the information presented in this Warranty Registration Card gives the manufacturer a better understanding of the sales status, so as to purport a more effective and efficient after-sales warranty service. Please fill out all the information carefully and genuinely, miswriting or absence of this card will void your warranty service. 2. RETURN NOTICE 2.1 In case of return for any warranty service, please make sure that the product is well packed in its original shipping carton, and it can protect your unit from any other extra damage. 2.2 Please provide a copy of your sales receipt or other proof of purchase with the returned machine, and give detail information about your return address and contact telephone number. 2.3 A brief description of the defect will be appreciated. 2.4 Please prepay all the costs involved in the return shipping, handling and insurance. 3. TERMS AND CONDITIONS 3.1
LTO warrants that this product will be free from any defects in materials and/or workmanship for a period
of 1 year from the purchase date if you have completed the Warranty Registration Card in time. 3.2 The warranty service is only available to the original consumer, who purchased this product directly from the retail dealer, and it can not be transferred. 3.3 During the warranty service, LTO may repair or replace this product at its own option at no charge to you for parts or for labor in accordance with the right side of this limited warranty. 3.4 This warranty does not apply to the damages to this product that occurred as the following conditions: Instead of operating in accordance with the user's manual thoroughly, any abuse or misuse of this product. Normal tear and wear. The product has been altered or modified in any way. Damage which may have been caused either directly or indirectly by another product / force / etc. Abnormal service or repairing by anyone other than the qualified personnel or technician. And in such cases, all the expenses will be charged to the buyer. 3.5 In no event shall LTO be liable for any incidental or consequential damages. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above exclusion or limitation may not apply to you. 3.6 This warranty gives you the specific rights, and these rights are compatible with the state laws, you may also have other statutory rights that may vary from state to state.

SEIKAKU TECHNICAL GROUP LIMITED No. 1, Lane 17, Sec. 2, Han Shi W. Road, Taichung, 401 Taiwan http://www.altomobile.com Tel: 886-4-22313737 email: info@altomobile.com Fax: 886-4-22346757 All rights reserved to ALTO Mobile. Due to continued development in response to customer feedback, product features, specifications and/or internal/external design may be changed without prior notice. No photocopying, translation or reproduction of any part of this user manual is allowed without prior written permission.Copyright c 2004 Seikaku Technical Group Limited.

NF01355-1.0

Service Manual

Model: L-8

(8-CHANNEL MIXING CONSOLE WITH DIGITEL EFFECTS)

www.altoproaudio.com

Version: 1.1

CONTENTS

1. Specification 2. Block Diagram 3. Schematic Diagram 4. Printed Circuit Board 5. Wiring Diagram 6. Test Procedure 7. Electrical Parts List 8. Exploded Views & Mechanical Parts List 9. Notes
8.1. SPECIFICATION (L-8) TECHNICAL SPECIFICATION
Mono input channels Microphone input Frequency response Distortion (THD & N) Gain range SNR (Signal to Noise Ratio) Line input Frequency response Distortion (THD & N) Sensitivity range Stereo input channels Line input Frequency response Distortion (THD & N) Impedances Microphone input Channel Insert return All other inputs Tape out All other output Equalization Hi shelving Mid bell Low shelving Low Cut filter DSP SECTION A/D and D/A converters DSP resolution Type of effects 24 bit 24 bit Hall, Room, Vocal & Plate REVERBS Mono & Stereo DELAY (max DELAY TIME 500ms) Chorus, Flanger & Vibrato MODULATIONS REV+DELAY, REV+CHORUS, REV+FLANGER, REV+VIBRATO combinations 256 16-position PRESET BANK Selector 16-position VARIATION selector CLIP LED MUTE SWITCH with LED indicator + 15dB @12kHz + 12dB @2.5kHz + 15dB @80Hz 75Hz, 18dB/oct. unbalanced 10Hz to 55kHz, + 3dB 0.005% at +4dBu, 1kHz electronically balanced, discrete input configuration 10Hz to 55kHz, + 3dB 0.005% at + 4dBu, 1kHz 0dB to 60dB (MIC) 115dB electronically balanced 10Hz to 55kHz, + 3dB 0.005% at + 4dBu, 1kHz +15dBu to 45dBu
1.4kOhm 2.5kOhm 10kOhm or greater 1kOhm 120Ohm

Presets Controls

Main Mix Section Noise (Bus noise)
Max output AUX Return gain range AUX Sends max out
Fader 0 dB, channels muted: 100dBr (ref.:+4dBu) Fader 0dB, all input channels assigned and set to UNITY gain: 90dBr (ref.:+4dBu) +22dBu balanced XLR, +22dBu unbalanced, 1/4" jacks OFF to +20dB +22dBu
Power supply Main voltage
USA/Canada Europe U.K./Australia
100 120V~, 60Hz 210 230V~, 50Hz 240V~, 50Hz
Power Consumption Fuse Main connection Physical Dimension (W D Net weight Shipping weight
25watts 100 120V~ : T500mAL 210 240V~ : T250mAL Standard IEC receptacle
245mm 268mm 2.4Kg (5.29lb) 3.5Kg (7.72lb)
24/73mm (9.64" 10.54"

0.94"/2.87")

MONO INPUT CHANNELS ( 1-4 )

PHANTOM POWER +48V

LEFT-BUS

PAN AUX SEND1

RIGHT-BUS AUX-2

MIC IN

LO CUT

2.Block Diagram

LINE IN AUX-1
MIC GAIN:0~60dB LINE IN TRIM:+15dB~-45dB

LO MID HI

INSERT
STEREO INPUT CHANNELS (5-8)

80 2.5K 12K 3-BAND EQ

LEFT-BUS +/-15db RIGHT-BUS

3c 4d 2b 1a

R RN TN

RIGHT-BUS

LEFT(MONO) 3c 4d 2b 1a

80 2.5K 12K EQ

2TK TO MIX

MIC5 IN

STEREO AUX RETURN 1

AUX RETURN1

STEREO AUX RETURN 2

AUX RETURN2

LEFT RIGHT-BUS

PRESETS

VARIATIONS
MUTE Titel Size A2(C) Model No: L-8 BLOCK DIAGRAM 5-Oct-2003 L8MAP.Sch Sheet Drawn By: ALTO MIXING CONSOLE Revision VERof 1 KEVIN LIN.
LEFT-BUS RIGHT-BUS AUX-1 AUX-2 EFX SEND

DSP FOOTSWITCH

+/-15db

AUX SEND

AUX1 AUX SEND2 EFX SEND

75Hz HI PASS

LEFT-BUS AUX-2

MAIN MIX LEVEL

MAIN OUT

MAIN MIX LEFT

BALANCE

1 MAIN MIX RIGHT C

2-TRACK

TAPE IN TAPE OUT

2TK TO CTRL ROOM
CONTROL ROOM & PHONES AUX1

CHANNEL 5,6 ONLY

PHONES OUTPUT

PHONES

CONTROL ROOM OUTPUT

LEFT METER

RIGHT METER

DSP BOARD

Date: File: 7

3. Schematic Diagram

C131 18n(M)

VR2 B50K

C163 18n(M)

EQ HI 12KHZ

C179 22P C87 47u/25V

C89 47u/25V

R256 3K9

C180 22P R270 36K

VR7A JQ10K C90 47u/25V VR7B JQ10K

R212 1K1 R137 1K3

C171 12n(M)

R220 1M

R287 5K1

C88 47u/25V

VR8 W50K

C135 18n(M)

VR34A B50K

C167 18n(M)

C187 22P C111 47u/25V

C113 47u/25V

L8MN1 (1/3)
R260 3K9 C188 22P R281 36K

C318 47u/25V

RTN-CH1

R196 910R

VR3 B50K

R197 910R

U3B 4580M C195 2.2u/50V R152 6K8

R236 30K

U3A 4580M

POST (PRE)

R286 5K1

R216 1K1 R145 1K3

C175 12n(M)

R224 1M

R244 22K

VR40A W50K

C116 47u/25V

MID 2.5K

R150 6K8 VR4 B50K C155 12n(M) R151 6K8 C140 33n(M) R47 10K

R264 +VCC 1K5

AUX-POST
R284 5K1 R285 5K1 VR6 W50K

PRE-CH5

R204 910R

VR35A B50K

R205 910R

U16A 4580M

C112 47u/25V C114 47u/25V R97 10K R245 22K
U17A 4580M R261 3K9 C189 22P R99 R280 10K 36K

R100 10K

VR39A JQ10K

R311 5K1

R166 6K8 C159 12n(M) VR36A R167 6K8 B50K C148 33n(M) R96 10K R98 10K C168 18n(M) C190 22P C119 47u/25V

LO 80HZ

C139 33n(M)
R248 4K7 R228 68K TR1 BR TR2 BR

LD1 RED

AUX-PRE

VR5 W50K

VR40B W50K

C147 33n(M)

U17B 4580M

C115 47u/25V

VR39B JQ10K

R310 5K1

C132 18n(M)

VR10 B50K

C164 18n(M)

C181 22P C94 47u/25V

C96 47u/25V

R257 3K9

C183 22P R271 36K
VR15A JQ10K C98 47u/25V VR15B JQ10K

C136 18n(M)

VR34B B50K

R213 1K1

(SOLTON 1K2)

C172 12n(M)

R221 1M

R291 5K1

R217 1K1 R146 1K3 C176 12n(M)

R225 1M

C95 47u/25V

VR16 W50K

R313 5K1 C199 2.2u/50V R170 6K8 R268 1K5

VR38 W50K

C319 47u/25V

RTN-CH2

R198 910R

R139 1K3

VR11 B50K

R199 910R

U6B 4580M C196 2.2u/50V R156 6K8

R237 30K

U6A 4580M

R290 5K1

PRE-CH6

R206 910R

VR35B B50K

R207 910R

U16B 4580M

C120 47u/25V

R154 6K8
C156 12n(M) VR12 R155 B50K 6K8 C142 33n(M) R55 10K R229 68K
R265 +VCC 1K5 R288 5K1 R289 5K1

VR14 W50K

R168 6K8 C160 12n(M) VR36B R169 B50K 6K8 C150 33n(M) R111 10K R233 47K R232 47K
R254 4K7 TR10 BR TR9 BR LD5 RED

R312 5K1

VR37 W50K

C141 33n(M)

R249 4K7 TR4 BR TR3 BR

LD2 RED

VR13 W50K

C149 33n(M)

C133 18n(M)

VR18 B50K

C165 18n(M)

C182 22P C101 47u/25V

C97 47u/25V

R258 3K9

C184 22P R272 36K
VR23A JQ10K C106 47u/25V VR23B JQ10K

C137 18n(M)

VR41A B50K

C169 18n(M)

R214 1K1 R141 1K3

C173 12n(M)

R222 1M

R295 5K1

C103 47u/25V

VR24 W50K

C191 22P C124 47u/25V

C121 47u/25V

R262 3K9

C192 22P R283 36K

R218 1K1 R147 1K3

C177 12n(M)

R226 1M

R246 22K

VR47A W50K

C130 47u/25V

C320 47u/25V

RTN-CH3

R200 910R

VR19 B50K

R201 910R
U9B 4580M C197 2.2u/50V R160 6K8

R238 30K R266 +VCC 1K5

U9A 4580M

R294 5K1

PRE-CH7

R208 910R

VR42A B50K

R209 910R

U19A 4580M
C127 47u/25V C128 47u/25V R121 10K R247 22K
U20A 4580M R263 3K9 C194 22P R123 R282 10K 36K

R124 10K

VR46A JQ10K

R316 5K1

R158 6K8 C157 12n(M) VR20 R159 6K8 B50K C144 33n(M) R63 10K R230 68K
R292 5K1 R293 5K1 VR22 W50K
R171 6K8 C161 12n(M) VR43A R172 B50K 6K8 C152 33n(M) R120 10K C170 18n(M) R122 10K

C143 33n(M)

R250 4K7 TR6 BR TR5 BR

LD3 RED

VR47B W50K

VR21 W50K

C151 33n(M)

U20B 4580M

C129 47u/25V

VR46B JQ10K J6

R315 5K1

C138 18n(M)

VR41B B50K

C134 18n(M)

VR26 B50K

C166 18n(M)

C185 22P C102 47u/25V

C105 47u/25V

R259 3K9

C186 22P R273 36K

VR31A JQ10K C107 47u/25V VR31B JQ10K

R296 5K1

C193 22P C125 47u/25V

R219 1K1 R148 1K3

C178 12n(M)
R227 1M R314 5K1 C200 2.2u/50V R173 6K8 R269 +VCC 1K5 R317 5K1 TR12 BR TR11 BR LD6 RED

VR45 W50K

R215 1K1 R143 1K3

C174 12n(M)

R223 1M

VR32 W50K

C321 47u/25V

RTN-CH4

R202 910R

VR27 B50K

R203 910R

U12B 4580M C198 2.2u/50V

C104 47u/25V
U12A 4580M R239 30K R267 +VCC 1K5

R299 5K1

PRE-CH8

R210 910R

VR42B R211 B50K 910R

U19B 4580M

C126 47u/25V R255 4K7

R174 6K8

R162 6K8 C158 12n(M) VR28 R163 B50K 6K8 C146 33n(M) R71 10K R231 68K

R164 6K8

R297 5K1 R298 5K1 VR30 W50K
C162 12n(M) VR43B R175 B50K 6K8 C154 33n(M) R125 10K

R234 47K

VR44 W50K

C145 33n(M)

R251 4K7 TR8 BR TR7 BR

LD4 RED

R235 47K

VR29 W50K

C153 33n(M)

PGND 8 +VCC

C205 100n

C289 100n

C295 100n

C297 100n

C217 100n

C219 100n

C207 100n

C201 100n

MAIN IN-OUTPUT L8MN1.S01

LED DISPLAY L8MN1.S02

UDASP IN-OUT SECTION L8MN1.S03 -VCC

U3C 4580M

U6C 4580M

U9C 4580M

U12C 4580M

U16C 4580M

U17C 4580M

U19C 4580M

U20C 4580M

C206 100n

C290 100n

C296 100n

C298 100n

C218 100n

C220 100n

C208 100n

C202 100n

INPUT STAGE

PCB# L8MN1.PCB

Size Date: File:

Model No: 5-Oct-2003 L8MN1.Sch

ALTO L-8 Sheet Drawn By:

Revision VERof 4 KEVIN LIN.

C241 47u/25V

AUX-RTN1-L

AUX RETURN 1

R77 8K2 R241 22K VR48A W50K

C223 22P R318 56K

PHONES/ CONTROL ROOM

R302 5K1

L8MN1 (2/4)
R344 3K9 C225 22P R278 36K C250 47u/25V

C249 47u/25V

C265 100P

U21A 4580M C269 22P

C243 47u/25V

SW10A PS-22E85L

MAIN-L-2

R348 27K

VR50B W50K

CTRL-R-L

C239 47u/25V

AUX-RTN1-R

R78 8K2 R240 22K

VR48B W50K

R320 56K R304 5K1 C245 47u/25V R25 3K9 C224 22P R319 36K

2TK TO CR-L L-METER

U27A 4580M C226 22P C255 47u/25V

SW10B PS-22E85L

R82 10K

C266 100P

U21B 4580M C9 47u/25V

R345 3K9 VR50A W50K

R279 36K

CTRL-R-R

C11 22P C19 47u/25V

AUX-RTN2-L

MAIN-R-2 2TK TO CR-R

C305 100n

C307 100n

C309 100n

C311 100n

C15 100n

C17 100n

C340 100n

+VCC -VCC PH PWR

U21C 4580M

A 4 -VCC

U23C 4580M

U24C 4580M

U25C 4580M

U26C 4580M

U27C 4580M

U1C 4580M

U2C 4580M

U31C 4580M
PRE-CH5 PRE-CH6 PRE-CH7 PRE-CH8 +VCC -VCC

C204 100n

C212 100n

C306 100n

C308 100n

C310 100n

C312 100n

C16 100n

C18 100n

C341 100n

Titel Size
STEREO AUX & SENDS & MAIN OUT & 2TK & CTRL R & PHONES Model No: A2(C) ALTO L-8 5-Oct-2003 L8MN1.S01
Revision VER030120 Sheet Drawn By: 2 of 3 KEVIN LIN.

Date: File:

LD10 GR
LD11 GR LD12 GR LD13 GR LD14 GR LD15 GR LD16 GR LD17 GR LD18 GR LD19 GR LD20 YEL LD21 RED

L8MN1 (3/4)

+VCC D

R350 120R

TR13 HR

U38B LM339

U38C LM339
U35B LM339 U39B LM339 U39C LM339 U40B LM339 U40C LM339

U35C LM339

U36B LM339

U36C LM339

U37B LM339

U37C LM339

R252 2K

LD7 GR

R351 470R

PWR ON

+VCC PGND
D1A R354 56R R355 120R R356 470R R359 330R R357 470R R360 330R R358 470R R361 510R R362 620R R363 1K3 R364 2K

D1B R365 5K6 R366 27K

PH PWR

DA204K

R87 10K

R352 470R

R253 4K7

LD8 RED U40A LM339

PGND 2 2
U38A LM339 U35D LM339 U36A LM339 U36D LM339 U39A LM339 U39D LM339

U38D LM339

U35A LM339

U40D LM339

U37A LM339

U37D LM339

13 -VCC

PHANTOM

R353 120R
TR14 HR LD22 GR LD23 GR LD24 GR LD25 GR LD26 GR LD27 GR

LD28 GR

LD29 GR

LD30 GR

LD31 GR

LD32 YEL

LD33 RED

C343 47P

C342 47P D3A DA204K D3B

R372 0R0

C213 100n
R373 47R +VCC C257 47u/25V U30C 4580M

R367 100K

L-METER

D2A DA204K

U35E LM339

U36E LM339

U37E LM339

U38E LM339

U44C 4580M

4 -VCC

U45C 4580M

U46C 4580M

U47C LM393

U43B NE555

U49G 74HC14

C35 100N
C36 +5VD 100N C86 10uF JP1

C30 100N

C32 100N

UDASP IN/OUT SECTION

Titel Size A2(C) Date: File:
UDASP IN/OUT SECTION Model No: 5-Oct-2003 L8MN1.S03 ALTO L-8 Sheet Drawn By: Revision VERof 4 KEVIN LIN.

R53 2K49

R90 2K49

C63 22P

R1 6K81 R13 4R7 C1 330P R14 4R7 R RN TN

R2 6K81 C29 47u/63V

C15 10n

R50 2K49 TR15 HR

C16 10n

R52 2K49 TR25 HR

D4 C51 BAS316 1000u/10V

R57 2K49 TR35 HR

C57 22P

U2A 4580M

C85 47u/25V
R5 6K81 R19 4R7 C3 330P R20 4R7 R RN TN

R6 6K81 C34 47u/63V

C31 10n

R61 2K49 TR19 HR

C38 10n

R66 2K49 TR29 HR

D6 C53 BAS316 1000u/10V

R126 2K49 TR37 HR

U8A 4580M

C92 47u/25V

U1A 4580M

R404 5K11

C49 22P R417 10K0 R46 5K11

R176 20K

SW1A PS-22E85L

U7A 4580M

R410 5K11
C58 22P R180 20K SW3A PS-22E85L

X5 JY-5042-030G

D 3c 4d 2b 1a
R28 20K C30 47u/63V R29 6K34 R30 6K34 R12 1K50 C5 1n R45 2K49

R388 470R

R389 470R VR1 2C10K
X9 JY-5042-030G C72 0.22u/50V
R42 20K C36 47u/63V R33 6K34 R34 6K34 R18 1K50 C9 1n R127 2K49

C48 22P

R403 5K11 U1B 4580M

R392 470R

R393 470R VR17 2C10K
R421 10K0 C64 22P R409 5K11 U7B 4580M
R62 5K11 C78 0.22u/50V C77 0.22u/50V R157 6K8 C100 47u/25V

LINE IN1

C19 22u/35V C20 22u/35V

INS-CH1 SW1B PS-22E85L

X6 JY-6351G-02-250

TR16 A1316

TR26 A1316
C71 0.22u/50V R418 10K0 R136 1K3

R11 4R7

R149 6K8 C86 47u/25V

LINE IN3

C25 22u/35V C26 22u/35V

INS-CH3 SW3B PS-22E85L

MIC GAIN=0~-60dB LINE IN GAIN=+15~-45dB

R15 1K50 C6 1n R51 2K49

-VCC +VCC +VCC

R58 2K49

X10 JY-6351G-02-250

TR20 A1316

TR30 A1316

R399 4R7

R422 10K0 C82 22P R408 5K11 C76 0.22u/50V

R140 1K3

C50 22P R402 5K11
C0.22u/50V R131 62K U2B 4580M

R177 20K

R21 1K50 C10 1n R129 2K49

R144 2K49

R133 62K

U8B 4580M

R182 20K

-VCC PH PWR +VCC

-VCC +VCC +VCC R135 +VCC

R56 2K49

2K49 R91 2K49 TR36 HR
R3 6K81 R48 4R7 C2 330P R49 4R7 R RN TN

R4 6K81 C32 47u/63V

C17 10n

R60 2K49 TR17 HR

C35 10n

R65 2K49 TR27 HR

D5 C52 BAS316 1000u/10V

C62 22P

U5A 4580M

C91 47u/25V

R7 6K81 R24 4R7 C4 330P R25 4R7 C27 22u/35V C28 22u/35V

R8 6K81 C37 47u/63V

C40 10n

R128 2K49 TR21 HR

C44 10n

R130 2K49 TR31 HR

D7 C55 BAS316 1000u/10V

R165 2K49 TR38 HR

C83 22P

U11A 4580M

C99 47u/25V

U4A 4580M

R407 5K11
C54 22P R419 10K0 R54 5K11

R178 20K

SW2A PS-22E85L

U10A 4580M

R411 5K11
C59 22P R423 10K0 R67 5K11

R181 20K

SW4A PS-22E85L

X7 JY-5042-030G

R40 20K C33 47u/63V R31 6K34 R32 6K34 R16 1K50 C7 1n R59 2K49

R390 470R

R391 470R VR9 2C10K
X11 JY-5042-030G C75 0.22u/50V R INS-CH2 SW2B PS-22E85L

3c 4d RN 2b TN 1a T 5e S

R43 20K C39 47u/63V R35 6K34 R36 6K34 R22 1K50 C11 1n R191 2K49

C60 22P

R406 5K11 U4B 4580M

R394 470R

R395 470R VR25 2C10K

C84 22P

R413 5K11 U10B 4580M
C81 0.22u/50V C80 0.22u/50V R424 10K0 R142 1K3

LINE IN2

C21 22u/35V C23 22u/35V

INS-CH4 SW4B PS-22E85L

X8 JY-6351G-02-250

TR18 A1316

TR28 A1316

R398 4R7

R420 10K0 C61 22P R405 5K11 C73 0.22u/50V

R138 1K3

C74 0.22u/50V

R153 6K8 C93 47u/25V

LINE IN4

X12 JY-6351G-02-250

TR22 A1316

TR32 A1316

R161 6K8 C108 47u/25V

R400 4R7

R17 1K50 C8 1n R64 2K49

R94 2K49

R132 62K

U5B 4580M

R179 20K
R23 1K50 C12 1n R379 2K49

R380 2K49

C110 22P R412 5K11

C79 0.22u/50V R134 62K

U11B 4580M

R183 20K

R385 2K49

R88 4R7 C18 330P R89 4R7

C41 47u/63V

+VCC 1

R9 6K81

R10 6K81

C46 10n

R382 2K49 TR23 HR

C47 10n

R384 2K49 TR33 HR

D8 C56 BAS316 1000u/10V

R386 2K49 TR39 HR

C317 22P U13A 4580M R416 5K11

U14A 4580M

C287 100n

C291 100n

C293 100n

U4C 4580M

U5C 4580M

U7C 4580M

U8C 4580M

U10C 4580M

U11C 4580M

R347 47R

C253 C313 47u/25V 100n

X13 JY-5042-030G

C65 22P R425 10K0 R95 5K11

U28C C296 100n R346 47R

BA15218N

C42 47u/63V

R396 470R

R397 470R VR33 2C10K

C315 22P

R415 5K11 U13B 4580M

R44 20K

C288 100n

C292 100n

C294 100n

C254 C314 47u/25V 100n C109 47u/25V R426 10K0 C297 100n C299 100n C301 100n C43 100n C303 100n
TR24 A1316 R26 1K50 C13 1n R381 2K49 R27 1K50

TR34 A1316

R401 4R7

U13C 4580M R190 20K

U14C 4580M

U15C 4580M

U18C 4580M
R387 2K49 C14 1n R383 2K49

STEREO AUX RETURN1

C304 100n

LEFT 1 (MONO / MASTER)

C316 22P R414 5K11

C300 100n

C302 100n

C45 100n

3c 4d 2b 1a 5e
R324 120R AUX-RTN1-L AUX-SEND1 R323 120R

FOOTSWITCH

R 3c RN 4d TN 2b

AUX SEND1

X18 JY-6351G-02-250 R112 10K C279 100P R113 10K
X22 JY-6351G-02-250 R322 120R AUX-RTN1-R AUX-SEND2 R325 120R

X25 JY-6351G-02-250

LINE IN 5/6

LEFT(MONO)

R101 10K C275 100P R102 10K C273 100P
C66 22P R107 10K R108 10K

C68 22P

C117 47u/25V

R37 10K

C22 TP7 47u/25V PRE-CH5 R192 20K U16A 4580M

LINE IN 7/8

R118 10K
C122 47u/25V PRE-CH7 R194 20K

RIGHT 1

AUX SEND2

X14 JY-6351G-02-250

C227 22P

R105 10K

U15A 4580M
X16 JY-6351G-02-250 C277 100P

C229 22P

R116 10K

U18A 4580M

X19 JY-6351G-02-250

X23 JY-6351G-02-250

STEREO AUX RETURN2

LEFT 2

R103 10K C276 100P R104 10K C274 100P C228 22P
C67 22P R110 10K R109 10K

C118 47u/25V R38 10K

C24 TP8 47u/25V PRE-CH6
R114 10K C280 100P R115 10K

C69 22P

TAPE IN

EFXRTN-L AUX-RTN2-L

L(WHITE)

TAPE OUT

X31 SCP6873NS3232

MAIN-L-2 R342 1K

X20 JY-6351G-02-250 R119 10K

C123 47u/25V PRE-CH8

RIGHT 2

R(RED)

MAIN-R-2 R343 1K 2TK-IN-L 2TK-IN-R

X15 JY-6351G-02-250

R106 10K

U15B 4580M

R193 20K
X17 JY-6351G-02-250 C278 100P

C230 22P

R117 10K

U18B 4580M

R195 20K

EFXRTN-R AUX-RTN2-R

X21 JY-6351G-02-250

CN1 9P-2.0 (TO L8PU1)

CN2 7P-2.0 (TO L8PU1) CTRL-R-R CTRL-R-L MAIN-R-2 MAIN-R-3 MAIN-L-2 MAIN-L-3

7 +VCC -VCC PH PWR

CN3 2.5-12P-B24 (TO L8MN1) RTN-CH1 RTN-CH2 RTN-CH3 RTN-CH4 PRE-CH5 PRE-CH6 PRE-CH7 PRE-CH8 +VCC -VCC

C261 22P R84 10K

R330 120R
RTN-CH1 INS-CH1 RTN-CH2 INS-CH2 RTN-CH3 INS-CH3 RTN-CH4 INS-CH4
U28A BA15218N C262 22P R83 10K

U28B BA15218N

R331 120R R332 120R

X28 JY-6351G-02-250

U29A BA15218N

R334 U29B 120R BA15218N

INPUT/OUTPUT STAGE

PCB# L8PU2.PCB

Model No: ALTO L-8 5-Oct-2003 L8PU2.Sch Revision VER030120 Sheet 1 of 1 KEVIN LIN. Drawn By:

CN1 9P-2.0

INSERT1

3c R RN 4d TN 2b

R3 120R

CTRL ROOM R

RTN1 INS1

S X5 JY-6351G-02-250

1a 5e 3c R RN 4d TN 2b

R1 120R

R4 120R

R6 120R

GND-INS
X1 JY-6351G-02-250 R2 120R

MAIN R (UNBAL)

CTRL ROOM L

R7 120R S

INSERT2

RTN2 INS2

3c R RN 4d 2b TN
S X6 JY-6351G-02-250 R11 120R

R8 120R

CN2 7P-2.0 MAIN-R-2 MAIN-R-3 MAIN-L-2 MAIN-L-3

X2 JY-6351G-02-250

R10 120R

R5 120R

MAIN L (UNBAL)

INSERT3

RTN3 INS3

X7 JY-6351G-02-250

R9 120R

R13 120R R14 120R

X3 JY-6351G-02-250

INSERT4

R21 5K1 R22 5K1

MAIN OUT (BALANCED)

X10 JY-5030-030G

RTN4 INS4

R12 120R

R15 120R R16 120R

X4 JY-6351G-02-250

R23 5K1

R24 5K1

X9 JY-5030-030G

OUTPUT STAGE (INSERT & MAIN OUTPUT)

PCB# L8PU1.PCB

Model No: ALTO L-8 Date: File:

Size A4

Revision VER021103 5-Oct-2003 L8PU1.Sch Sheet 1 of 1 Drawn By: KEVIN LIN.

4. PRINTED CIRCUIT DIAGRAM

PCB : L8MN1 Top Overlay

PCB : L8MN1 Top Layer

PCB : L8MN1 Bottom Layer

PCB : L8PU1 Top Overlay

PCB : L8PU1 Bottom Layer

PCB : L8PU2 Top Overlay

PCB : L8PU2 Top Layer

PCB : L8PU2 Bottom Layer
PCB : RD82PWR Top Overlay
PCB : RD82PWR Bottom Layer

PCB : 313123/2 Top Layer

PCB : 313123/2 Bottom Layer
PCB : 313123/2 Top Overlay

7P-2.0

(TO L8PU2)

9P-2.0

5. Wiring Diagram

2P-2.5

(TO L8MN1)

2.5-8P

CN3 CN5 CN1

3P-3.2 3

(TO L8MN1) 2.5-12P-B24 (TO L8MN1) 2.5-12P-B24

(TO L8MN1) 2.5-8P-B24A

RD82PWR

CN2 7P-2.0 (TO L8PU1)

2.5-12P-B24 (TO L8PU2) (TO RD82PWR)

2.5-12P-B24 (TO L8PU2)

2.5-8P-B24A (TO L8PU2)
PT-S12_230V (PT-S12_115V)

Titel Size A3 Model No:

ALTO MIXING CONSOLE Revision L-8 WIRE CONFIGATION 5-Oct-2003 L8PIN.Sch Sheet Drawn By: VERof 1 SAMBOW

7. Electrical Parts List

8. Exploded Views
Mechanical Parts List Model No.
NO 45 Item No MA04065 HK03838 MG00305 MG00061 MG00041 MF00061 ME00060 NI02084 NI01862 NI01863 HK03835 MG00304 MG00363 NI02083 NI02081 NI02082 NI00826 NI02386 NI02633 MI01629 TC00160 MG00102 MJ01189 NI02620 HK03893 HK03836 HC00008 MG00042 HI00171 HI00026 ME00016 MF00038 HA01174 MF00048 MB02799 HK03648 MJ01145 MF00037 MF00030 ME00015 MG00162 NI02249 NI00501 NC00022 NC00005

ALTO L-8

Item Description panel K-PC board copper pole screw screw washer socket nut knob key key K-PC board copper pole bare knob knob knob knob konb knob separating shade transformer screw partitions insulation board PC board K-PC board AC outlet screw power switch power switch colour nut washer signle terminal wiring CF:W146 washer rear board K-PCb heat sink washer washer colour nut screw caushion foot cushion insulation silicone insulator L-8 ALTO P-L8PU2-DIP M3*24*0.5PH M3*10 M3*6 JY-6351G-02-250 JY-6351G-02-250 10.5*18 5.5*5.5*14.5 5.5*W10*7.5 P-L8MN1-DIP M3*14*0.5PH M3*14*0.5PH 10.5*18 10.5*18 10.5*18 12*18 double color 14*13mm 10.5*18 S-12 PT-S12_230V M4*8 L-8 1*86.5*53 L-8 P-313123-DIP(L-8) P-L8PUA TYPE(RF-2004-C-4.8) M3*10 R612KKAT0F1 RA12KKATOF 2P 4m/m 4* 7*1t 80 green/yellow 4* 8*0.5t L8 P-RD82PWR(RD82FX) RD82 3* 5*1t 3* 8*0.8t 3m/m M3*8 TW-1(TO-220) 12.7*9*3t(SF-004) 0.3t*18*45mm S-8 TO-220 square type pcs 1