Re: Techwood PLR85 Receiver
Source: http://sci.techarchive.net/Archive/sci.electronics.repair/200710/msg01156.html
From: rush14 <rush14@xxxxxxxxxxxxxxx> Date: Thu, 25 Oct 2007 12:32:On Oct 25, 2:29 am, "Jerry G." <jerry.@xxxxxxxxxxxxxxxxx> wrote: The output stage is damaged. More than likely some output transistors, drivers, and some support components are damaged. Your friend should send the receiver to a service centre to have it checked. Considering that it is not a big name brand, the service tech may have difficulty to purchase the service manual and any proprietary parts if required. Jerry G. ====== "Darmok" <cooncat.s.@xxxxxxxxx> wrote in message news:mpmvh3p1hmlbr2nptegu6bovcnc07hdrm4@xxxxxxxxxx Hi, A friend of mine at work has a Techwood PLR85 Home Theater Receiver. He recently had a party, and had a couple speakers outside, connected to the receiver (indoors). A sudden rain shower got the speakers (not the receiver) wet outside, and since then, whenever he tries to power on the receiver, after the "WELCOME" message scrolls by, a "PROTECT" message appears on the display. There is a connector to what I believe is the PA board, and when that connector is disconnected, the unit powers up without the "PROTECT" message. Anyone have any kind of information on this unit? I'm trying to help this guy out, but I'm not familiar with this brand, and have no schematics. Tia, Bill
Try hooking up another set of speakers to see if they work. If they Re: Techwood PLR85 Receiver 1
Re: Techwood PLR85 Receiver do then I suspect his other speaker(s) are still wet causing the receiver to sense them as shorted and going into a protect mode of some sort. Let those speakers dry out throughly (days maybe). Don't know if they'd be worth a crap even if they do dry out but what the heck. Rush.

CDC-85

COMPACT DISC CHANGER

OWNERS MANUAL

CAUTION
RISK OF ELECTRIC SHOCK DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.
IMPORTANT SAFETY INSTRUCTIONS
CAUTION: Read all of these instructions. Save these instructions for later use. Follow all warnings and instructions marked on the audio equipment. 1) Read instructions - All the safety and operating instructions should be read before the product is operated. 2) Retain instructions - The safety and operating instructions should be retained for future reference. 3) Heed Warnings - All warnings on the product and in the operating instructions should be adhered to. 4) Follow Instructions - All operating and use instructions should be followed. 5) Cleaning - Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning. 6) Attachments - Do not use attachments not recommended by the product manufacturer as they may cause hazards. 7) Water and Moisture - Do not use this product near waterfor example, near a bath tub, wash bowl, kitchen sink, or laundry tub; in a wet basement; or near a swimming pool; and the like. 8) Carts and Stands - The product should be used only with a cart or stand that is recommended by the manufacturer. 9) A product and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the product and cart combination to overturn. 13) Ventilation - The product should be situated so that its location or position does not interfere with its proper ventilation. For ob a bed, sofa, rug, or similar surface that may block the ventilation openings: or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings. 14) Power Sources - This product should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance. 15) Grounding or Polarization - This product may be equipped with a polarized alternating-current line plug (a plug having one blade wider than the other). This plug will fit into the power outlet only one way. This is a safety feature. If you are unable to insert the plug fully into the outlet, try reversing the plug. If the plug should still fail to fit, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the polarized plug. Alternate Warnings - This product is equipped with a threewire grounding-type power oltlet. This is a safety feature. If outlet, contact your electrician to replace your obsolete outlet. Do not defeat the safety purpose of the grounding- type plug. 16) Power-Cord Protection - Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the product. 17) Protective Attachment plug - The product is equipped with an attachment plug having overload protection. This is a safety feature. See Instruction Manual for replacement or resetting of protective device. If replacement of the plug is required, be sure the service technician has used a replacement plug specified by the manufacturer that has the same overload protection as the original plug. 18) Cleaning - The product should be cleaned only as recommended by the manufacturer. 19) Power Lines -An outdoor antenna should be located away from power lines. 20) Outdoor Antenna Grounding - If an outside antenna or cable system is connected to the product, be sure the antenna or calbe system is grounded so as to provide some protection against voltage surges and built-up static charges. Article 810 of the National Electrical Code, ANSI/NFPA 70, provides information with regard to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna discharge unit, size of grounding conductors, location of antenna-discharge unit, connection to grounding electrodes, and requirements for the grounding electrode. Note to CATV system installer: This reminder is provided to call the CATV system installers attention to Section 820-40 of the NEC which provides guidelines for proper grounding and, in particular, specifies that the cable ground shall be connected to the grounding system of them building, as close to the point of cable entry as practical.

10) Wall or Ceiling Mounting - The product should be mounted to a wall or ceiling only as recommended by the manufacturer. 11) Accessories - Do not place this product on an unstable cart, stand, tripod, bracket, or table. The product may fall, causing serious injury to a child or adult, and serious damage to the product. Use only with a cart, stand, tripod, bracket, or table recommended by the manufacturer, or sold with the product. Any mounting of the product should follow the manufacturers instructions, and should use a mounting accessory recommended by the manufacturer. 12) Ventilation - Slots and openings in the cabinet are provided for ventilation and to ensure reliable operation of the product and to protect it from overheating, and these openings must not be blocked or covered. The openings should never be blocked by placing the product on a bed, sofa, rug, or other similar surface. This product should not be placed in a built-in installation such as a bookcase or rack unless proper ventilation is provided or the manufacturers instructions have been adhered to.
Example of Antenna Grounding as per National Electrical Code, ANSI/NFPA 70

ANTENNA LEAD IN WIRE

GROUND CLAMP ANTENNA DISCHARGE UNIT (NEC SECTION 810-20)
ELECTRIC SERVICE EQUIPMENT
GROUNDING CONDUCTORS (NEC SECTION 810-21) GROUND CLAMPS POWER SERVICE GROUNDING ELECTRODE SYSTEM (NEC ART 250,PART H)
28) Replacement Parts - When replacement parts are required, be sure the service technician has used replacement parts specified by the manufacturer or have the same characteristics as the original part. Unauthorized substitutions may result in fire, electric shock, or other hazards. 29) Safety Check - Upon completion of any service or repairs to this product, ask the service technician to perform safety checks to determine that the product is in proper operating condition. 30) Heat -The product should be situated away from heat sources such as radiators, heat registers, stoves, or other products (including amplifiers) that produce heat. CAUTION : Any changes or modifications in construction of this device which are not expressly approved by the party responsible for compliance, could void the users authority to operate the equipment. NOTE : This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequence energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guar antee that interference to radio or television reception, which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures: - Reorient or relocate the receiving antenna. - Increase the seperation between the equipment and receiver. - Connect the equipment into an outlet on a circuit different from that to which the receiver is connecte. - Consult the dealer or an experienced radio/ TV technician for help.

CAUTION : TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT. ATTENTION : POUR VITER LES CHOCS LECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA BORNE CORRES PONDANTE DE LA PRISE ET POUSSER JUSQUAU FOND.
NEC-NATIONAL ELECTRICAL CODE
21) Lightning -For added protection for this product during a lightning storm, or when it is left unattended and unused for long periods of time, unplug it from the wall outlet and disconnect the antenna or cable system. This will prevent damage to the product due to lightning and power-line surges. 22) Power Lings -An outside antenna system should not be located in the vicinity of overhead power lines or other electric light or power circuits, or where it can fall into such power lines or circuits. When installing an outside antenna system, extreme care should be taken to keep from touching such power lines or circuits as contact with them might be fatal. 23) Overloading - Do not overload wall outlets, extension cords, or integral convenience receptacles as this can result in a risk of fire or electric shock. 24) Nonuse Periods - The power cord of the product should be unplugged from the outlet when left unused for a long period of time. 25) Object and Liquid Entry - Never push objects of any kind into this product through openings as they may touch dangerous voltage points or short-out parts that could result in a fire or electric shock. Never spill liquid of any kind on the product. 26) Damage Requiring Service - Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions: a) When the power-supply cord or plug is damaged. b) If liquid has been spilled, or objects have fallen into the product. c) If the product has been exposed to rain or water. d) If the product does not operate normally by following the operating instructions. Adjust only those controls that are covered by the operat ing instructions as an improper adjustment of other controls may result in damage and will often require extensive work by a qualified technician to restore the product to its normal operation. e) If the product has been dropped or damaged in any way. f) when the product exhibits a distinct change in performancethis indicates a need for service. 27) Servicing - Do not attempt to service this product yourself as opening or removing covers may expose you to dangerous voltage or other hazards. Refer all servicing to qualified service personnel.
- Use of controls, adjustments or the performance of procedures other than those spedified may result hazardous radiation exposure. - To prevent direct exposure to laser beam, do not try to open the enclosure.

DO NOT STARE INTO BEAM.

CONTENTS
IMPORTANT SAFETY INSTRUCTIONS..... 2 CONTENTS......4 PRECAUTIONS.....5 Read This Before Operating.....5 Handling the Discs....5 CONNECTIONS.....6 CONTROLS AND INDICATORS....7 Front Panel.....7 Display.....8 OPERATIONS.....9 Basic Operations.....9 Repeat Play.....9 Program Play.....10 Time Display.....11 Search function.....12 Direct access to a track.....12 TROUBLESHOOTING.....13 SPECIFICATIONS.....14

PRECAUTIONS

Read This Before Operating
Choose the installation location of your unit carefully. Avoid placing it in direct sunlight or close to a source of heat. Also avoid locations subject to vibrations and excessive dust, heat, cold or moisture. Do not open the cabinet as this might result in damage to the circuitry or electrical shock. If a foreign object should get into the set, contact your dealer. When removing the power plug from the wall outlet, always pull directly on the plug, never yank the cord. Do not attempt to clean the unit with chemical solvents as this might damage the finish. Use a clean, dry cloth. Keep this manual in a safe place for future reference. Remove all of the discs in the tray when you move this system, to prevent discs from becoming stuck.

Handling the Discs

This unit has been designed specifically for reproduction of compact discs bearing the mark. No other discs can be reproduced. Always place the compact disc in the disc tray with the label facing upward. (compact discs can be played only on one side.) To remove a disc from its storage case, press down on the center of the case and lift the disc out, holding it carefully by the edges.

How to remove the disc

How to hold the disc
Fingermarks and dust should be carefully wiped off the discs recorded surface with a soft cloth.

Wipe radially

Never use chemicals such as record sprays, antistatic sprays or fluid, benzine or thinner to clean compact discs. Such chemicals will do irreparable damage to the discs plastic surface. Discs should be returned to their cases after use to avoid serious scratches that could cause the laser pickup to skip. Do not expose discs to direct sunlight or high humidity and temperature for extended periods. Long exposure to high temperatures can warp the disc. Do not stick paper or write anything with a ballpoint pen on the surface of the label side.

CONNECTIONS

CAUTION : When you pull the plug out, make sure that the unit has been turned to POWER STANDBY first. Never disconnect the power with the unit on.

1. LINE OUT jacks

Connect these iacks to the CD input jacks on the amplifier : White pin-plug White jack (left) Red pin-plug Red jack (right)

White White White

3. AC power cord
Plug this AC power cord into a 120 Volt, 60 cycle grounded AC wall socket or the AC OUTLETS on the rear of the STR-84 or PLR-85 receiver.

Red Red Red

2. REMOTE CONTROL jacks
Connect the supplied remote control cable to the REMOTE CONTROL jacks as shown in the above diagram, Connect the other end of the cable to the rear of the matching STR84 or PLR-85 receiver. The remote control functions of this tape deck will only operate when connected to a matching Techwood STR-84 or PLR-85 receiver.

IMPORTANT :

A remote control is not included with this CD changer.

CONTROLS AND INDICATORS

Front Panel
1. POWER STANDBY / ON button and Indicator 2. Disc Select buttons (1~5)
There are five Disc Selection buttons numbered 1 through 5, each one corresponding to a numbered disc position on the disc tray. When your disc player is in playback mode, you can press one of these buttons to halt playing of the current disc and start playback of the disc whose number corresponds to the button you have pressed.

11. Disc Skip button

The Disc Skip button located inside on top of the disc tray is used to rotate the disc tray to its next disc playing position in a clockwise direction. With each press of this button, the tray will advance one disc position. Ex : 5 1

12. Play button (

3. Repeat button
This button is used for repeating one track, one disc or all discs.
Pressing the Play button will start playback of all discs loaded onto the disc tray. They will be played in sequential order starting with the disc loaded into position one on the tray. Playback in this manner is called Continuous Play.

4. Program button

Use this button to program the order in which the selections are played.
13. Search Forward button (

5. Clear button

Use This button to cancel the programmed playback.
When pressed and held down, the Search Forward button allows the listener to fast forward to a particular musical passage on disc. When fast forwarding, sound will be heard and appropriate track and time information will be displayed.

6. Time button

The Time button allows any one of four different types of tracking and time information to be displayed. Each press of the Time button advances the display once.
14. Search Reverse button (

7. Disc Tray

Load a disc on this tray with its label side up while the tray is open.
When pressed and held down, the Search Reverse button allows the listener to fast reverse to a particular musical passage on disc. As the disc is spinning in reverse, sound will be heard and appropriate track and time information will be displayed.
15. Skip Forward button (

8. Pause button (

Pressing Pause button will halt playback of a disc temporarily with the display showing the Pause indicator and current track and time. Pressing the Play button again will resume playback starting from the current track and time on the disc.
With each press of the Skip Forward button, the disc currently being played will advance to the beginning of its next track and resume playing.
16. Skip Reverse button (

9. Stop button (

Pressing the Stop button will halt playback of a disc and advance the disc to its end. The last track and total time of the disc will be displayed. Pressing the Play button will resume playback of the disc starting at its first track.
With one press of the Skip Reverse button, the disc currently being played will reverse its direction to the beginning of its current track and resume playing. With two presses of the Skip Reverse button, the disc will reverse its direction to the beginning of its previously recorded track and resume playing.

10. Open/Close button (

17. Display
This display shows the current operating status of this unit.
With one touch of this button the disc compartment opens for disc loading. With another touch the compartment closes. 7

Display

1. Play indicator
The play indicator will appear in the display when the Play button is pressed and a disc is playing.

7. REPEAT play indicator

ONE : This lights up when repeat play of a single track is engaged. : This lights up when repeat play of one entire disc is engaged. TTL : This lights up when repeat play of all discs in the tray is engaged.

2. Pause indicator

When the Pause button is pressed and the disc player is in its pause mode, the pause indicator will be visible in the display.

8. OVER MARK 3. Track Number indicator
During playback of a disc, the Track Number indicator will display the number of the track being played. This indicator lights up when the total number of tracks on the disc is 16 or more.
9. Track calendar display 4. Index Number indicator
It will be appeared when you played a track which is devided chapter. Indicates the number of tracks on the disc being played and which track is playing.
10. Program Play indicator 5. Time mode indicator
The time mode indicator will appear on the display if the Time button is used to select the time remaining of a disc. The program Play indicator will appear in the display when the disc player is in the program play mode and disc selections are programmed to play in a specific order.

6. Time indicator

The time indicator will show the elapsed time of the track being played, track time remaining on the disc or total time of the disc being played. What type of time indication is selected by the time button.

11. Disc NO. indicator

This indicates whether a disc is in a tray slot or not and which disc is playing. Ex.) means there is a disc in Tray No. 1. means Tray No. 1 is selected.

OPERATIONS

Basic Operations Repeat Play
1. Press the open/close( ) button. The disc tray will slide out. 2. Load a disc with its label side facing up. 3. Press Disc Skip button to select another Tray. 4. Load another disc to Tray. Repeat as desired for up to 5 discs. 5. Press the open/close button to close the DISC TRAY. 6. Press the Disc Skip button to select a disc. 7. Select the track you want by pressing the music Skip button( ). , 8. Press the play button( ), and the CD will be played. ) when you want to pause

One-repeat play function

1. Press the repeat button. Only the current track is played repeatedly.

REPEAT ONE

* If you select other tracks during one-repeat play, the track selected last will be repeated.
1 Disc-repeat play function
2. Press the repeat button once more. All the tracks on a disc are played repeatedly. * When the tracks are programmed, only the programmed tracks will be repeated.
9. Press the pause button( playing. 10. Press the stop button( playing.

REPEAT

) when you want to stop

First Track Last Track

All Disc-repeat play function
3. Press the repeat button once more and of all the discs inserted in the disc tray continue to play repeatedly. * Press the button once more to cancel the repeat play function.

REPEAT TTL

1 Disc 2 Disc 3 Disc

Last Disc

Program Play
For your reference: FULL appears on the display when the 33rd track has been programmed (no further programming is possible). Only track numbers actually on the disc can be programmed. The programmed play sequence is not lost even if the unit is turned off. The unit will stop automatically when all programmed tracks have finished playing, and the programmed contents disappear from the display. It is possible to program with the disc tray opened. Note : If you press the program button while programming, programming will cease and change into the program recall mode. If you stop playback, the programmed contents will disappear from the display, but they are not lost from the memory. Press the program button when you want to recall the programmed contents. The program is enabled even if the tray is open.

With this program play function, you can program up to 32 tracks in any desired order. Before beginning: Programming can be done only in the stop mode.
Programming with music skip button
1. Press the program button in the stop mode. 2. Select a DISC by using the DISC SKIP button. 3. Select the desired track by using the music skip( button. Example : Track No. 5 on the Disc No.5. , )

Recalling the program

1. Press the program button. - Then the first programmed track will appear on the display. 2. Press the button repeatedly if you want to check the programmed contents. - Each time the button is pressed, the next programmed contents will appear on the display in the programmed order. 3. Press the play ( ) button at any time if you want to play the disc in the programmed order.
4. Press the program button again. - Then, the 5th track has been programmed as program No.1. 5. Repeat step 2 and step 3 and step 4 to continue programming other tracks. 6. Press the play ( ) button. - The program play will start in the programmed order.
Erasing all the programmed contents
1. Press the program button. 2. Press the clear button and hold it for longer than 2 seconds. - All the programmed contents will be lost. Note: The Program button and the clear button can work only in the stop mode.

Time Display

* Changing the programmed contents
Deleting: Undesired tracks can be deleted from the originally programmed contents. 1. Press the program button repeatedly until the track number that you want to delete appears on the display. 2. Press the clear button. - Then that track number will be deleted from the pro grammed contents. If you press the button repeatedly, the next programmed tracks will be deleted one by one each time the button is pressed.
Status of the display This unit can display four types of time mode on the time counter in the display. 1. The elapsed time of the current track is automatically displayed when playback begins.
Adding after the last track:
1. Press the program button repeatedly until END appears on the display. 2. Enter new tracks in the same way as normal programming after END disappears from the display. 2. During playback, press the time button once and the time remaining on the track is displayed.

Adding to any position:

1. Select the program number which you want to add a new track to by pressing the program button. 2. Enter the new track in the same way as normal programming. 3. Press the time button again and the total elapsed time of the disc being played is displayed.
4. Press the time button once more and, the total remaining time of the entire disc display will be displayed.
Notes: Time will not be displayed during programmed play if the programmed contents exceed 100 minutes. In this case, --,-- will be shown instead. If you press the time button in the stop mode, the total track number and the total playing time of the current disc will be displayed. When track 33 or more is played. the remaining time will not be displayed.
SEARCH function Track Search
1. Press and release the beginning of the next track. Press and hold down the subsequent track. button to advance to the button to advance to a

Direct access to a Track

Select a disc number using the Disc No. buttons. Select a track number using the Disc Skip bottons and then press the play button. Note: Track numbers can be designated from 1 to 99. When a track number which is not contained on a disc is designated, the last track of the disc will be played.
2. Press and release the button to return to the beginning of the currently playing track. Press and hold down the button to return to previous tracks.

Manual Search

1. Press and hold down either Search button to quickly search the disc in the forward or reverse direction. - The volume is lowered to about 1/4 of the current volume. - Search is possible during pause mode, but no sound is heard. - The CD changer will not search beyond the beginning or the end of the disc. 2. Press the stop button to end normal play. - The play indicator goes off. - The time display shows total time of the disc. Note : The unit will stop when the last track on disc number 5 has finished playing.

TROUBLESHOOTING

To determine any problem with your CD changer, always check the most obvious possible causes first. If any problem still remains after your have checked the items below, consult your nearest TECHWOOD dealer. Problem No power when the POWER button is set to ON. Disc play does not start. Probable Cause Power plug not connected in the AC outlet. The disc is loaded upside down. The disc is too dirty. No sound. Incorrect audio cable connections. Remedy Insert the power plug firmly into the AC outlet. Reload the disc with the label side up. Clear the disc. Correctly connect the CD changer to the amplifier. Make sure that the amplifier controls are set correctly. Change the installation location.

Incorrect amplifier operation.

Sound skips.

The CD changer is subject to vibration or physical shock. Defective or deeply scratched disc.
Play another disc. Press the stop button, then enter a program. Firmly connect all the cables. Use supplied remote cable.
Programmed play does not function.
The CD changer is in the normal play mode. Loose cable connections. Remote cable is not connected to changer and/ or receiver. Changer is not being used with compatible receiver.
A Hum sound can be heard. No remote control functions.
Remote functions only operate with matching STR-84 or PLR-85 receivers.

SPECIFICATIONS

Audio Section
Frequency : 10 Hz ~ 20 kHz (0.5 dB) Dynamic Range : More than 90 dB S/N Ratio : 100 dB (IHF) T.H.D : 0.015% (1 kHz) Channel Separation : More than 82 dB (1 kHz) Wow/Flutter : Less than measuring limit Output Voltage : 2.0Vp-p

Pick-up Section

Type : Non-contact optical reading Lighting Source : Semi-conductor laser Wave Length : 780 nm

General

Power Requirements : 120 V AC, 60 Hz Power Consumption : 13 W Dimensions (W x H x D) : 435 x 132 x 396 mm Weight (net) : 6.8 kg Standard Accessories : Audio Connection Cord x 1 Owners manual x 1 Remote Control connection Cable x 1 Improvements may result in specifications and features changing without notice. Illustrations may differ slightly from production models.

Signal Section

Sample Frequency : 44.1 kHz Correction Type : CIRC Demodulation : 1 bit
WELTON U.S.A. 11625 COLUMBIA CENTER DR. SUITE 100 DALLAS, TEXAS 75229 PHONE: 972-243-5602 FAX: 972-243-5958

KQX1A445Z