Custom code 43: A code 52: B code Data code

Initial mode

BS DIGIATL

Blinks.

CHANNEL

<Reference>

VHS SYSCON

KBUS_OUT

40GB HDD

AD 4:19

KBUS_IN

Firmware

HDD driver Navigation information

AD 0:15

IC8204 8M FLASH
boot loader VHS Navi back up

LADO 4:11

IC8206
Address Latch Address Latch

AD 4:11

E:08 is displayed in the case of a communication error with the VHS SYSCON

HOSTDATA

IDE 40PIN

AD 16:31

LADO 12:19

AD 12:19

IC8205

IC8207

DVD 0_:7_

IC8001 ASIC_IF

AD 0:31

IC8201 MPEG_DEC

VIO 0:7

TABLE OF CONTENTS

Section
Hard Disk Drive (HDD) Important Safety Precautions INSTRUCTIONS 1. DISASSEMBLY 1.1 HOW TO REMOVE THE MAJOR PARTS... 1-1
3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6

3.3 VIDEO CIRCUIT... 3-2

1.1.1 Introduction... 1-1
1.2 1.3 1.4 1.5 HOW TO READ THE DISASSEMBLY AND ASSEMBLY.. DISCONNECTION OF CONNECTORS (WIRES).. SCREWS USED CABINET COMPONENTS AND BOARD ASSEMBLIES. HOW TO REMOVE THE MAJOR PARTS <COM section>.. 1-1 1-1 1-1 1-2
D/A level.... 3-2 EE Y level.... 3-3 PB Y level (S-VHS / VHS).. 3-3 REC color (colour) level... 3-3 Video EQ (Frequency response).. 3-4 AUTO PICTURE initial setting... 3-4
3.4 DIGITAL CIRCUIT.... 3-4
3.4.1 HDD EE Y level... 3-4 3.4.2 HDD PB Y level... 3-5 3.4.3 HDD PB C burst level... 3-5

3.5 AUDIO CIRCUIT... 3-5

1.5.1 Disassembly flow chart... 1-2 1.5.2 Disassembly/assembly method <COM section>.. 1-2
1.6 HOW TO REMOVE THE MAJOR PARTS <VHS section>.. 1-4
3.5.1 Audio REC FM... 3-5
3.6 DEMODULATOR CIRCUIT... 3-6
1.6.1 Disassembly flow chart... 1-4 1.6.2 DIsassembly/assembly method <VHS section>.. 1-4
1.7 HOW TO REMOVE THE MAJOR PARTS <HDD section>.. 1-6
1.7.1 Disassembly flow chart... 1-6 1.7.2 DIsassembly/assembly method <HDD section>.. 1-6

5-1 5-2 5-4 5-6

2.3.1 2.3.2 2.3.3 2.3.4 2.3.5
Checking/Adjustment of FM Waveform Linearity.. 2-16 Checking/Adjustment of the Height and Tilt of the Audio Control Head 2-17 Checking/Adjustment of the Audio Control Head Phase (X-Value). 2-17 Checking/Adjustment of the Standard Tracking Preset. 2-18 Checking/Adjustment of the Tension Pole Position.. 2-18
3. ELECTRICAL ADJUSTMENT (VHS) 3.1 PRECAUTION.... 3-1
3.1.1 3.1.2 3.1.3 3.1.4 3.1.5
Required test equipments.. 3-1 Required adjustment tools... 3-1 Color (colour) bar signal,Color (colour) bar pattern.. 3-1 Switch settings and standard precautions.. 3-1 EVR Adjustment.... 3-1

3.2 SERVO CIRCUIT... 3-2

3.2.1 Switching point... 3-2 3.2.2 Slow tracking preset... 3-2
SW REGULATOR BOARD ASSEMBLY <01>.. 5-6 REGULATOR BOARD ASSEMBLY <02>.. 5-7 MAIN BOARD ASSEMBLY <03>.. 5-8 3D DIGITAL/2M BOARD ASSEMBLY <07>.. 5-15 TERMINAL BOARD ASSEMBLY <06>... 5-16 A/C HEAD BOARD ASSEMBLY <12>.. 5-17 DEMOD BOARD ASSEMBLY <14>... 5-17 S-SUB BOARD ASSEMBLY <15>... 5-17 ON SCREEN BOARD ASSEMBLY <17>.. 5-18 EJECT SW BOARD ASSEMBLY <27>... 5-19 SW/DISPLAY BOARD ASSEMBLY <28>.. 5-19 JACK BOARD ASSEMBLY <36>.. 5-20 LED/SW BOARD ASSEMBLY <47>.. 5-20 DIGITAL BOARD ASSEMBLY <50>... 5-20 LOADING MOTOR BOARD ASSEMBLY <55>.. 5-25 LED BOARD ASSEMBLY <90>.. 5-25
Important Safety Precautions
Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and certain parts of the product. When performing service, be sure to read and comply with these and other cautionary notices appearing in the operation and service manuals. 2. Parts identified by the ! symbol and shaded ( ) parts are critical for safety. Replace only with specified part numbers. Note: Parts in this category also include those specified to comply with X-ray emission standards for products using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission. 3. Fuse replacement caution notice. Caution for continued protection against fire hazard. Replace only with same type and rated fuse(s) as specified. 4. Use specified internal wiring. Note especially: 1) Wires covered with PVC tubing 2) Double insulated wires 3) High voltage leads 5. Use specified insulating materials for hazardous live parts. Note especially: 1) Insulation Tape 3) Spacers 5) Barrier 2) PVC tubing 4) Insulation sheets for transistors 6. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering.

9 (S5) <Note 4>

Fig. H2
10 (S5) 12 (S5) WR8 WR12 Foil side <Note 3>
WR14 Supporting tape side <Note 3>
CN8901 CN8002 CN8601 CN(S5)

Fig. H3

1.8 SERVICE POSITIONS The servicing locations for use in troubleshooting or servicing of the set are provided separately for the VHS and HDD.
< Installation > (1) Stand up the bottom chassis assembly so that the Regulator side is in the lower position. (2) Connect the PATCH CORD to the three FPCs then connect CN3014, CN7508 and CN7509. (3) By connecting a total of two FPCs and wires (CN703/ CN2601), carry out the installation so that the Main board assembly comes in the upper position. Point: Take care that the FPCs and wires are not subjected to stress in this positioning. (4) Connect the PATCH CORDS to the two FPCs of the front panel assembly, then connect the CORDS to the CN7507/CN3011. For the PATCH CORD is required, see Table 1-8-2.
I SERVICE POSITIONS <VHS SIDE> II SERVICE POSITIONS <HDD SIDE>
1.8.1 Service position <VHS SIDE> <Removal> (1) Remove the top cover and bracket. (2) Remove the front panel assembly. (3) Remove the MAIN board assembly together with the mechanism assembly. Fig. No. (Page) (1) Top cover, Bracket (2) Front panel assembly (3) Rear cover (4) Main board assembly (etc.) COM1 (1-3) COM2 (1-3) Screw 9 (No.1-9) 0 Hook, etc. Connector Note 2+1 (L1,2) 8 (L3) 0 0
Board to Board (CN7507/ CN3011) 1 (CN5325) 5 (CN5321/ CN5322/ CN3014/ CN703/ CN2601) A B C D E PTU94022-10 PTU94022-18 PTU94022-11 PTU94022-15 YTU94072-06
WIRE QUQ112-1040CG QUQ112-1840CG QUQ212-1140CG QUQ212-1540CG QUQ210-0640CG
COM(1-3) (No.28-35) V2, V(1-6) (No.4-10)

Table 1-8-2

Table 1-8-1

PATCH CORD PTU94017B

Main board assembly
CN7508 CN7509 CN3011 CN703 CN3014

A 1 B 2 E 6 3

CN7507

CN5322

CN5321

Front panel assembly

CN8601 CN8002 CN8801

Fig. 1-8-1

Service position <VHS side>
1.8.2 Service position <HDD side> (1) Remove the exterior parts (Top cover and front panel assembly). (2) Remove the hard disk drive(HDD) together with the frame. (3) Remove the digital board assembly together with the wires attached to it, and place the assembly upside down on an insulated mat that is placed on the mechanism (VHS) assembly. (4) Mount the HDD that was removed in (2) to its original position on the bottom chassis assembly, and connect the wires to the connector CN8001 on the digital board assembly and to the connector CN5326 on the regulator board assembly. Fig. No. Screw (Page) (No.) (1) (2) (3) (4) Top cover, Brackets Front panel assembly Hard disk drive assembly Digital board assembly Hooks, Connectors Note etc. (No.)

This unit has a function for storing the history of the past two emergencies (EMG) and displaying them on each FDP. With the status of the VCR and mechanism at the moment an emergency occurred can also be confirmed.
FDP display switching [DV] FDP display : :

** * *

Example 1
E : 01 : 03 Previous emergency
Normal display Emergency content display (E:Latest:Previous) Emergency content display (E:Latest:Previous)
Latest emergency Example 2 E : : No emergency record

** : ** ** : **

[VHS] FDP display 0 : 00 : E: 1: Normal display Emergency content display (E:Latest:Previous)
For the emergency content, see 1.11.3 Emergency content description.
[VHS] For the emergency content, see 1.11.3 Emergency content description. (2) Transmit the code 59 from the Jig RCU again. The FDP shows the emergency detail information 1 in the form of 1 : 2 : 3 4.

** : **

* * * 5: * 6 : * 7
2 : Emergency detail display 1 Emergency detail display 2
Notes: The emergency detail display show the information on the latest emergency. It becomes : : when there is no latest emergency record. When using the Jig RCU, set its custom code to match the custom code of the VCR.
Jig RCU [Data transmitting method] Depress the ( 3 ) button after the data code is set.
1 : Deck operation mode at the moment of emergency 2 : Mechanism operation mode at the moment of emer-
gency : Mechanism sensor information at the moment of emergency 4 : Mechanism mode position at the moment of emergency
Note: For the emergency detail information 1 , see 1.11.4 Emergency detail information 1. (3) Transmit the code 59 from the Jig RCU once again. The FDP shows the emergency detail information 2 in the form of 5 : 6 : * 7.
CUSTOM CODE 43: A CODE 53: B CODE DATA CODE

INITIAL MODE

* * tape in use 1. * 5 :: Type of the cassettethe cassette tape in use 6 Winding position of * 7 : Type of the cassette tape in use 2 (Winding area) *
Fig. 1-11-1 Jig RCU [PTU94023B]
Note: For the emergency detail information 2 , see 1.11.5 Emergency detail information 2. (4) Transmit the code 59 from the Jig RCU once again to reset the display.
1.11.2 Clearing the emergency history (1) Display the emergency history. (2) Transmit the code 36 from the Jig RCU. (3) Reset the emergency display.

(Y292-03e)

1.11.3 Emergency content description Note: Emergency contents E08/E09 are for the model with Dynamic Drum (DD).

E01: Loading EMG

CONTENT
When the mechanism mode cannot be changed to another mode even when the loading motor has rotated for more than 4 seconds in the loading direction, [E:01] is identified and the power is turned off.
1 The mechanism is locked in the middle of mode transition. 2 The mechanism is locked at the loading end due to the encoder position reading error during mode transition. 3 Power is not supplied to the loading MDA. 1 The mechanism is locked in the middle of mode transition. 2 The mechanism is locked at the unloading end due to the encoder position reading error during mode transition. 3 Power is not supplied to the loading MDA. 1 The take-up reel pulse is not generated in the FWD transport modes (PLAY/ FWD SEARCH/FF, etc.) because; 1) The idler gear is not meshed with the take-up reel gear; 2) The idler gear is meshed with the take-up reel gear, but incapable of winding due to too large mechanical load (abnormal tension); 3) The take-up reel sensor does not output the FG pulse. 2 The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.) because; 1) The idler gear is not meshed with the supply reel gear. 2) The idler gear is meshed with the supply reel gear, but incapable of winding due to too large a mechanical load (abnormal tension); 3) The supply reel sensor does not output the FG pulse. 3 Power is not supplied to the reel sensors. 1 The drum could not start or the drum rotation has stopped due to too large a load on the tape, because; 1) The tape tension is abnormally high; 2) The tape is damaged or a foreign object (grease, etc.) adheres to the tape. 2 The drum FG pulse did not reach the System controller CPU because; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (hall device) of the drum is faulty. 3 The drum control voltage (DRUM CTL V) is not supplied to the MDA. 4 Power is not supplied to the drum MDA. 1 The cassette cannot be ejected due to a failure in the drive mechanism of the housing. 2 When the housing load increases during ejection, the loading motor is stopped because of lack of headroom in its drive torque. Housing load increasing factors: Temperature environment (low temperature, etc.), mechanism wear or failure. 3 The sensor/switch for detecting the end of ejection are not functioning normally. 4 The loading motor drive voltage is lower than specified or power is not supplied to the motor (MDA). 5 When the user attempted to eject a cassette, a foreign object (or perhaps the user's hand) was caught in the opening of the housing. 1 The capstan could not start or the capstan rotation has stopped due to too large a load on the tape, because; 1) The tape tension is abnormally high (mechanical lock); 2) The tape is damaged or a foreign object (grease, etc.) is adhered to the tape (occurrence of tape entangling, etc.). 2 The capstan FG pulse did not reach the System controller CPU because; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (MR device) of the capstans is faulty. 3 The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA. 4 Power is not supplied to the capstan MDA. 1 The SW 5 V power supply circuit is shorted with GND. 2 The SW 12 V power supply circuit is shorted with GND. 1 HDD is defective 2 KBUS_DATA signal is disconnected in the middle.

E0A:Supply Reel Pulse EMG
When the supply reel pulse has not been generated for more than 10 seconds in the capstan rotating mode, [E:0A] is identified and the cassette is ejected (but the power is not turned off). However, note that the reel EMG is not detected in the SLOW/STILL mode.
Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output EC1 or EU1: Head clog warning channels (without regard to the A.FM output) has remained below a certain threshold level for more than 10 seconds, [E:C1] or [E:U1] is identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the 3-second warning display and 7-second noise picture display alternately. EMG code : E:C1 or E:U1 / FDP : U:01 / OSD : Try cleaning tape. or Use cleaning cassette. The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is changed to another mode than PLAY.

Table 1-11-1

1.11.4 Emergency detail information 1 The status (electrical operation mode) of the VCR and the status (mechanism operation mode/sensor information) of the mechanism in the latest emergency can be confirmed based on the figure in EMG detail information 1. [FDP display]
* 2 : Mechanism Operation Mode [Table of MN]
Display 08 0A 0C 0E 18 1A 1C 1E 28 2A 2C 2E 80 Mechanism Operation Mode Command standby (Status without executing command) POWER OFF by EMG occurrence Moving to the adjacent position in the LOAD direction Moving to the adjacent position in the UNLOAD direction Cassette ejection being executed Cassette insertion being executed Tape being loaded Tape being unloaded Mode transition to STOP with pinch roller compression ON Mode transition to STOP with pinch roller compression OFF Mode transition to STOP with pinch roller compression OFF as a result of POWER OFF Mode transition to STOP with pinch roller compression ON as a result of POWER ON Mode transition to PLAY Mode transition to FWD SEARCH Mode transition to REC Mode transition to FWD STILL/SLOW Mode transition to REV STILL/SLOW Mode transition to REV SEARCH Mode transition from FF/REW to STOP Mode transition to FF Mode transition to REW 4 sec. of REV as a result of END sensor going ON during loading Short FF/REV as a result of tape sensor going ON during unloading Mechanism position being corrected due to overrun Mechanism in initial position (Dummy command)

* 1 :1* 2 : operation mode at the moment of emergency * 2 :: Deck operation mode at the moment of emergency * : Mechanism sensor information at the moment of emergency 3 Mechanism
: Mechanism mode position at the moment of emergency
Note: In the Deck operation mode/Mechanism operation mode/ Mechanism mode position, the contents of the code that is shown on the FDP differs depending on the parts number of the System Control microprocessor (IC3001) of the VCR. For the microprocessor parts number that starts with the two letters MN, refer to the Table of MN and for parts number with HD, refer to the Table of HD. Operation Mode * 1 : DeckMN] [Table of
Display 04 0C 24 2C 44 4C 6C 8C 8D 8E AC AD CC CD EC ED Deck Operation Mode Mechanism being initialized STOP with pinch roller pressure off (or tape present with P.OFF) STOP with pinch roller pressure on POWER OFF as a result of EMG PLAY REC Cassette ejected FF Tape fully loaded, START sensor ON, short FF Cassette identification FWD SEARCH before transition to FF (SP x7-speed) FWD SEARCH (variable speed) including x2-speed INSERT REC REW Cassette identification REV SEARCH before transition to REW (SP x7-speed) REV SEARCH (variable speed) AUDIO DUB INSERT REC (VIDEO + AUDIO) FWD STILL/SLOW REV STILL/SLOW REC PAUSE Back spacing Forward spacing (FWD transport mode with BEST function) INSERT REC PAUSE INSERT REC Back spacing AUDIO DUB PAUSE AUDIO DUB Back spacing INSERT REC (VIDEO + AUDIO) PAUSE INSERT REC (VIDEO + AUDIO) Back spacing

[Table of HD]

Display 05 0E 26 2E 4C 6E 8F AF C7 CD EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE Mechanism Operation Mode STOP with pinch roller pressure off STOP with pinch roller pressure on U/L STOP (or tape being loaded) PLAY PLAY (x1-speed playback using JOG) REC Cassette ejected FF FWD SEARCH (variable speed) including x2-speed INSERT REC REW REV SEARCH AUDIO DUB INSERT REC (VIDEO + AUDIO) FWD STILL/SLOW REV STILL/SLOW REC PAUSE INSERT REC PAUSE REV SEARCH (x1-speed reverse playback using JOG) AUDIO DUB PAUSE INSERT REC (VIDEO + AUDIO) PAUSE Mechanism being initialized POWER OFF as a result of EMG Cassette being inserted Cassette being ejected Transition from STOP with pinch roller pressure on to STOP with pinch roller pressure off Transition from STOP with pinch roller pressure on to PLAY Transition from STOP with pinch roller pressure on to REC Cassette type detection SEARCH before FF/REW is being executed Tape being unloaded Transition from STOP with pinch roller pressure off to STOP with pinch roller pressure on Transition from STOP with pinch roller pressure off to FF/REW Transition from STOP with pinch roller pressure off to REC.P (T.REC,etc.) Transition from STOP with pinch roller pressure off to cassette type detection SEARCH Short REV being executed after END sensor on during unloading Tension loosening being executed after tape loading (STOP with pinch roller pressure on)
Display 04 0E 26 2E 4C 6E 8F AF CD EF Deck Operation Mode STOP with pinch roller pressure off (or tape present with P.OFF) STOP with pinch roller pressure on PLAY REC Cassette ejected FF FWD SEARCH (variable speed) including x2-speed INSERT REC REW REV SEARCH (variable speed) AUDIO DUB INSERT REC (VIDEO+AUDIO) FWD STILL/SLOW REV STILL/SLOW REC PAUSE INSERT REC PAUSE AUDIO DUB PAUSE INSERT REC (VIDEO+AUDIO) PAUSE

Control plate

UV catcher2

Coupling gear

Direct gear

Relay gear

Clutch unit

Drive gear

Idler lever

Drive arm

Guide rail

Link lever

2.2 REPLACEMENT OF MAJOR PARTS 2.2.1 Before Starting Disassembling (Phase matching between mechanical parts) The mechanism of this unit is closely linked with the rotary encoder and system controller circuits. Since the system controller detects the status of mechanical operation in response to phases of the rotary encoder (internal switch positions), the mechanism may not operate properly unless such parts as the rotary encoder, control plate, loading arm gear, control cam, cassette gear, limit gear, relay gear and drive gear are installed in their correct positions. Especially, this model is not provided with any cassette housing assembly, so that cassette loading and unloading must be accomplished by operation of the cassette holder assembly. The latter is in turn driven by such parts as the drive gear, relay gear and limit gear. Exercise enough care, therefore, to have the phases of all this gear matching one another. (For information on phase matching of the mechanism, see the instructions on how to install individual parts.) This unit is provided with a mechanism assembly mode. It is therefore necessary to enter this mode for assembling and disassembling procedures. This mode is usually not in use, manually set it when it is required. 2.2.2 How to Set the Mechanism Assembling Mode Remove the mechanism assembly and place it bottom side up. (See SECTION 1 DISASSEMBLY.) Turn the worm gear toward the front so that the guide hole of the control cam is brought into alignment with the hole at the mechanism assembly chassis. This position renders the mechanism assembling mode operational. Make sure that the control plate is located in alignment with the mark E. (See Fig.2-2-2a.)
2.2.3 Cassette Holder Assembly 1. How to remove (1) Remove the guide rail and roller cam assembly. (See Fig.2-2-3a.) (3 lugs on the guide rail and one lug on the roller cam assembly)
Guide rail Roller cam assembly
Fig. 2-2-3a (2) Remove the two slit washers and remove the cassette housing bracket. (See Fig.2-2-3b.) (3) Remove the opener guide, spring(A), door opener, relay gear and limit gear. (See Fig.2-2-3b.)

Limit gear

Spring(A) Opener guide

Chassis hole Worm gear

Door opener
Slit washers Cassette housing bracket

Guide hole

Fig. 2-2-3b

Control cam

(4) While swinging the lock levers (R) and (L) of the cassette holder assembly toward the front, slide the cassette holder assembly until its legs come to where the guide rail and the roller cam assembly have been removed (so that the drive arm is upright). (See Fig.2-2-3c.)
Lock lever (L) Cassette holder assembly Drive arm (Upright)

Mark E

Fig. 2-2-2a

Fig. 2-2-3c 2-6

(5) While holding the left side of the cassette holder, lift the cassette holder assembly so that the three legs on the left side are all released. Then pull the legs A and B on the right side out of the rail and also pull up the leg C. (See Fig.2-2-3d and Fig.2-2-3e.) (6) Draw out the drive gear, and remove the drive arm.

Fig. 2-2-3d

2. How to install (Phase matching) (1) Insert the section A of the drive arm into the section B of the main deck. (2) Insert the section 1 of the drive gear into the round hole, and the section 2 into the square hole on the drive arm. (See Fig.2-2-3f.) (3) Hold the drive arm upright and fit the leg C on the right side of the cassette holder assembly into the groove. (See Fig.2-2-3g.) (4) While swinging the lock lever (R) of the cassette holder assembly toward the front, put the legs A and B into the rail. (See Fig.2-2-3g.) (5) Drop the three legs on the left side of the cassette holder assembly into the groove at one time. (See Fig.2-2-3h.) (6) Slide the whole cassette holder assembly toward the front to bring it to the eject end position. (7) Install the limit gear so that the notch on the outer circumference of the limit gear is brought into alignment with the guide hole on the main deck. (See Fig.2-2-3i.) (8) Install so that the notch on the periphery of the relay gear is aligned with the notch of the main deck and that hole A of the relay gear is aligned with the hole A of the limit gear and that hole B of the relay gear is aligned with the hole B of the drive gear. (See Fig.2-2-3i.) (9) Install the door opener, opener guide, spring(A) and cassette housing bracket and fasten the two slit washers.

Lock lever (R)

Fig. 2-2-3e

Main deck right side

Fig. 2-2-3g
Hole Hole Drive gear Drive arm

Fig. 2-2-3h

Fig. 2-2-3f

2.2.6 Audio Control Head

Notches Relay gear Guide hole Notch
1. How to remove (1) Remove the two screws (A) and remove the audio control head together with the head base. (2) When replacing only the audio control head, remove the three screws (B) while controlling the compression spring.

Fig. 2-2-25c

Tighten

Fig. 2-2-25d

2.3 COMPATIBILITY ADJUSTMENT Notes: Although compatibility adjustment is very important, it is not necessary to perform this as part of the normal servicing work. It will be required when you have replaced the audio control head, drum assembly or any part of the tape transport system. To avoid any damage to the alignment tape while performing the compatibility adjustment, get a separate cassette tape (for recording and play back) ready to be used for checking the initial tape running behavior. Unless otherwise specified, all measuring points and adjustment parts are located on the Main board. When using the Jig RCU, set its custom code to match the custom code of the VCR.
(6) Make sure that the V.PB FM waveform varies in parallel and linearly with the tracking operation again. When required, perform fine-adjustment of the guide roller of the pole base assembly (supply or take-up side). (7) Unload the cassette tape once, play back the alignment tape (A1) again and confirm the V.PB FM waveform. (8) After adjustment, confirm that the tape wrinkling does not occur at the roller upper or lower limits. (See Fig. 2-31d.) [Perform adjustment step (9) only for the models equipped with SP mode and EP (or LP) mode.] (9) Repeat steps (1) to (8) by using the alignment tape (A2).
Max level Min level Proper waveform variation
Fig. 2-3a Jig RCU [PTU94023B] 2.3.1 Checking/Adjustment of FM Waveform Linearity
Signal Mode Equipment Measuring point External trigger Adjustment part Specified value Adjustment tool (A1) (A2) (B) (C) (D) (E) (F) (G) (H)
Alignment tape(SP, stairstep, NTSC) [MHP] Alignment tape(EP, stairstep, NTSC) [MHP-L] PB Oscilloscope TP106 (PB. FM) TP111 (D.FF) Guide roller [Mechanism assembly] Flat V.PB FM waveform Roller driver [PTU94002]
Improper waveform variation

Fig. 2-3-1a

Roller driver
Guide roller (supply side)
(1) Play back the alignment tape (A1). (2) Apply the external trigger signal to D.FF (E), to observe the V.PB FM waveform at the measuring point (D). (3) Press the channel buttons (+, ) simultaneously to enter the manual tracking mode. This also brings tracking to the center (centre). (4) Make sure that there is no significant level drop of the V.PB FM waveform caused by the tracking operation, with its generally parallel and linear variation ensured. Perform the following adjustments when required. (See Fig. 2-3-1a.) (5) Reduce the V.PB FM waveform while pressing the channel buttons (+, ) during playback. If a drop in level is found on the left side, turn the guide roller of the pole base assembly (supply side) with the roller driver to make the V.PB FM waveform linear. If a drop in level is on the right side, likewise turn the guide roller of the pole base assembly (take-up side) with the roller driver to make it linear. (See Fig. 2-3-1c.)

Control head position

Capstan side

Maximum
Fig. 2-3-3b 2.3.4 Checking/Adjustment of the Standard Tracking Preset
Signal Mode Equipment Measuring point External trigger Adjustment part Specified value Adjustment tool (A) (B) (C) (D) (E) (F) (G) (H)

Fig. 2-3-5a

Alignment tape(EP, stairstep, NTSC) [MHP-L] PB Auto adjust Oscilloscope TP106 (PB. FM) TP111 (D.FF) Jig RCU: Code 50 STOP mode
(Maximum V.PB FM waveform)

Jig RCU [PTU94023B]

Mechanism Timing Chart
Mechanism mode Control plate mark
EJECT END E HIGH C CH LOW HIGH B CH LOW HIGH A CH LOW

CASSUP U

CASS-INS CI

FF/REW FR

STOP ST

SLOW/STILL SL

PLAY P
Control cam angle Rotary encoder angle Pole base
ON HALF PRESS CONTACT OFF ON PLAY ON REV CONTACT OFF (C-INS) ON

412.42

Pinch roller

Guide arm

OFF ON HALF REV HALF FF/REW OFF ON CONTACT OFF ON CONTACT OFF ON

Tension arm

Main brake S

Main brake T

Sub brake S

OFF ON

Sub brake T

Capstan brake

OFF IN FF/REW

OUT PLAY OFF

Change lever 2

ON SUPPLY

Idler position

CENTER TAKE-UP READY

RESET ON

Rec safety switch

Timer REC standby STOP (drum at stop) POWER OFF (cassette loaded)

Backspace Search REW

Slow FOR
REC pause REC Search FF STOP (drum in motion)

Operation mode

Slow REW
SECTION 3 ELECTRICAL ADJUSTMENT
3.1 PRECAUTION The following adjustment procedures are not only necessary after replacement of consumable mechanical parts or board assemblies, but are also provided as references to be referred to when servicing the electrical circuitry. In case of trouble with the electrical circuitry, always begin a service by identifying the defective points by using the measuring instruments as described in the following electrical adjustment procedures. After this, proceed to the repair, replacement and/or adjustment. If the required measuring instruments are not available in the field, do not change the adjustment parts (variable resistor, etc.) carelessly. 3.1.1 Required test equipments Color (colour) television or monitor Oscilloscope: wide-band, dual-trace, triggered delayed sweep Frequency counter Audio level meter Signal generator: RF / IF sweep / marker Signal generator: stairstep, color (colour) bar [NTSC] Recording tape Digit-key remote controller(provided) 3.1.2 Required adjustment tools

Tuner EE Audio level meter IC1501 pin 26 Jig RCU : Code 57 A : 23 (Press remote controller 2

and 3 keys.)

(1) Connect the short wire between the short point (D2) and the GND (Ground). (2) Connect the equipment (C) to the measuring point (D1).
(1) Set an audio signal mode of the RF signal generator to alternate L-ch 300 Hz 14% modulated. (2) Connect the equipment (C) to the measuring point (D). (3) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (4) Set the EVR address to (F2) by pressing the button of the digit-key remote controller.
(5) Adjust with the channel buttons (+,) on the VCR (or on the remote controller) so that the level of the measuring point (D) becomes the specified value (G). (6) Release the EVR mode of the VCR by transmitting the code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) 3.6.5 Separation - 2

Signal Mode (A) (B)

(Audio: L-ch 5 kHz 14% modulated)
Equipment Measuring point EVR mode EVR address Specified value Adjustment tool
(C) (D) (F1) (F2) (G) (H)
Tuner EE Audio level meter IC1501 pin 26 Jig RCU : Code 57 A : 24 (Press remote controller 2

and 4 keys.)

(1) Set an audio signal mode of the RF signal generator to alternate L-ch 5 kHz 14% modulated. (2) Connect the equipment (C) to the measuring point (D). (3) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (4) Set the EVR address to (F2) by pressing the button of the digit-key remote controller. (5) Adjust with the channel buttons (+,) on the VCR (or on the remote controller) so that the level of the measuring point(D) becomes the specified value (G). (6) Release the EVR mode of the VCR by transmitting the code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) 3.6.6 SAP VCO
No. signal Tuner EE Frequency counter IC1501 pin 26 C1505 () terminal Jig RCU : Code 57 A : 25 (Press remote controller 2

and 5 keys.)

78.67 0.5 kHz Jig RCU [PTU94023B] Digit-key remote controller
(1) Connect the short wire between the short point (D2) and the GND (Ground). (2) Connect the equipment (C) to the measuring point (D1). (3) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (4) Set the EVR address to (F2) by pressing the button of the digit-key remote controller. (5) Adjust with the channel buttons (+,) on the VCR (or on the remote controller) so that the frequency of the measuring point (D1) becomes the specified value (G). (6) Release the EVR mode of the VCR by transmitting the code (F1) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) (7) Disconnect the short wire between the short point (D2) and the GND (Ground).