1. Power Circuit(SMPS)

(1) No 5.3 A

No 5.3V

Replace F101(Use a specified fuse).

Replace BD101.

Replace R101.

Is D103 normal?

NO

Check/

Replace D103

(2) No 9V

No 12V

YES

Check/ Replace Q163

YES

Is D106 normal?

YES

NO

Replace D106.

(3) No 24 V

YES

Check the power terminal at main

PCB short.

Replace IC103.

Replace D109.

Is L103 normal?

No 24V

(4) No 5.2 A (TO AVCP, BIAS)

(5) No 10V

No 5.2V

Is D106 normal?

YES

Is Q153 normal?

YES

Is there voltage (about 0V) at Q157 collector.

YES

Check/

Replace Q156

NO

Replace D106.

NO

Replace Q153.

No 10V

Does noise level on the screen change periodically?

YES

IC501 Pin 76?

YES

NO

Does CTL pulse move on tracking?

YES

Does Video Envelope wave form NO appear at IC501 pin 86?

YES

Replace IC501.

Replace IC501.

Check the Pre-Amp circuit

NO

Is it 12VA at PMC01 Pin2?

YES

NO

Is there 2.8V at PMC01 Pin9?

Check Power circuit

Does PWM signal appear at IC501 Pin 33?

Check the Video input Jack &

jack Board connection.

Check the IC3G1 Pin14

and Q3G1 emitter.

YES

Is 5V applied to the

NO

Check the 5VA Line.

IC301 Pin16, 40, 55, 58, 75, 87?

(Power Circuit)

YES

Does the Video signal appear at the IC301 Pin29?

YES

NO

YES

NO

Does the Video signal appear at the Emitter terminal of the Q380?

YES

Replace the Q380.

Check the 9V Line.

(Power Circuit)

Is 5V applied to the IC301 Pin 16, 40, 55, 58, 87?

Is the I2C Bus signal applied to the IC301 Pin 23, 24?

YES

YES

Is the V.H.S/W "H" about

3.4V to the IC301 Pin11 ?

YES

Is V.H.S/W "H" about 3.4V at the IC301 Pin 11?

YES

Clean the Drum.

NO

Check the V.H.S/W level. (Check R304, R305)

NO

Replace the IC301.

YES

NO

Is the Y(Luminance) Video waveform

showed up at the IC301 Pin 41?

Is 5V applied to the IC301 Pin 16, 40, 55, 58, 87?

Is the Color Rotary signal applied to the IC301 Pin 10?

YES

NO

NO

Check the line of the 5.3VA Line. (Power Circuit)

Check the Color Rotary

Circuit. (IC501 pin 98)

YES

YES

Does the Color signal appear at the IC301 Pin 61?

YES

Check the circuit of the

Replace the IC301.

IC301 Pin 35, 62.

Does PB Mode operate normally?

YES

Does the RF signal appear at the IC301 Pin 12?

YES

Does the REC RF signal appear at the IC301 Pin90?

YES

Check the Drum &

Drum Connector

NO

NO

NO

Check PB Mode.

Is the REC 'H' signal (about 4V)applied to the IC301 Pin 30?

YES

Check REC Luminance

Pass & Color Pass.

Check the circuit of the

IC301 Pin 90, 92, 94

YES

4. AUDIO CIRCUIT

(1) No sound in EE Mode

No sound in EE Mode.

YES

No sound.

YES

(2) No sound in PB MODE

No sound in PB Mode.

YES

No sound.

YES

YES

YES

Does the CLK/Data signal(I2C) appear at the IC301 Pin 23, 24?

YES

NO

NO

Check the IC501 Pin 18(CLK),

17(Data) Line.

Does the Audio signal appear at the IC301 Pin 96?

YES

NO Is the Audio Mute "High" signal applied

Does the Audio signal appear at the IC301 Pin 1?

YES

Check the connecting State between

the P3D02 Pin 6 and A/C Head.

YES

Check the connection of the Audio out Jack.

YES

Does the CLK/Data signal(I2C) appear at the IC301 Pin 23, 24?

YES

Is the Audio signal applied to the IC301 Pin 76?

YES

Does the Audio waveform appear at the IC301 Pin 7?

YES

Is 5V applied to the FL401

Pin 2?

YES

YES

Check the IC501 Pin 96

(Audio Mute ???H???).

NO

pin23?

YES

Check Drum motor signal

No cassette tape loading

YES

Is there REG. 12V at PMCQ1 Pin8?

YES

Does 'H' signal appear at IC501

Pin62 while inserting CST?

NO

Check power circuit L104.

NO

Is there 5.3V at IC501 Pin73?

YES

As pressing the byttons doeseach

function work properly?

NO

Replace bad switches

6. OSD CIRCUIT

(1) No OSD display.

(2) No F.OSD display.

No OSD display.

YES

Is there 5.3V IC501 Pin 51?

YES

NO

NO

Check 5.3V Line of power circuity.

No F.OSD display.

YES

Refer to ???(5) No OSD picture???

YES

NO

NO

Check power Vcc 9V

Does oscillation appear at the

IC501 PIns 37, 38?

Does oscillation appear at the

IC501 Pins 40, 41?

YES

NO

Does Video signal appear at the IC501 Pin 47?

YES

Replace IC501.

Replace X502.

Check peripheral circuit and replace X501

Check the signal between IC501 Pin47 and V.out Jack.

Does video signal appear at IC501 Pin 50?

YES

Replace IC501

Check the signal between IC301 Pin 29 and IC501 Pin 49.

DECK MECHANISM PARTS

LOCATIONS

DECK MECHANISM

DISASSEMBLY

DECK MECHANISM ADJUSTMENT

MAINTENANCE/INSPECTION

PROCEDURE

MECHANISM TROUBLESHOOTING

GUIDE

EXPLODED VIEWS

??? Top View

??? Bottom View

NOTE : When reassembly perform the procedure in the reverse order.

1)When reassembling, confirm Mechanism and Mode Switch Alignment Position (Refer to Page 4-13)

2)When disassembling, the Parts for Starting No. Should be removed first.

T:Top, B:Bottom

2. Plate Top (Fig. A-2-1)

1)Pull the (B) portion of the Plate Top back in direction of arrow and separate the right side of it.

2)pull the (B???) portion of the Plate Top back in direction of arrow and separate the left side of it.

(Used tools : (-) type driver, anything tool with sharp point or flat point.)

NOTE

(1)When reassembling, push the Plate Top after alignment the two position(C), (C???) as below Fig.

2)Unhook three Hooks(H3, H4, H5) on bottom side of the Chassis, lift up the Bracket Assembly L/M and disassem- ble the Bracket Assembly L/D Motor.

(H3)

(H5)

(B')

(C')

(C)

(B)

6. Gear Assembly Rack F/L (Fig. A-2-5)

1)Move the Gear Assembly Rack F/L in direction of arrow(A) and unhook the Hook(H6) pulling back in front.

2)Separate the Gear Rack F/L in direction of arrow(B).

NOTE

When reassembling, align the gear part of the Gear Assembly Rack F/L with the Gear Drive as below Fig.

3. Holder Assembly CST (Fig.A-2-2)

1)Move the Holder Assembly CST in direction of arrow and separate the left side of it first through the (D) position of the Chassis.

(D)

2)Disassemble the right side of the Holder Assembly CST from each guided hole of the Chassis.

NOTE

When reassembling, insert the (E) part of the Holder Assembly CST in the (E???) hole of the Chassis first and assemble the left side of it.

4. Opener Door (Figure. A-2-3)

1)Turn the Opener Door clockwise and remove it through the guide hole of the Chassis.

5. Bracket Assembly L/D Motor

(Fig. A-2-4)

1) Unplug the Connector(C1).

Gear Rack F/L

Gear Drive

7. Arm Assembly F/L (Fig. A-2-6)

1)Move the Arm Assembly F/L in direction of arrow and separate the left side of it first.

2)Disassemble the Arm Assembly F/L from each guided hole of the Chassis.

8. Lever Assembly S/W(Fig. A-2-7)

1)Unhook the Hook(H8) in the left side of the Chassis and remove the Lever Assembly S/W.

Chassis

(H8)

1)Unhook the Spring TB from the Hook(H9) of the Chassis.

2)Lift the Brake Assembly T up.

13. Brake Assembly RS (Fig. A-4-2)

1)Unhook the Spring RS from the Hook(H10) of the Chassis.

2)Lift the Brake Assembly T up.

14. Arm Assembly Tension (Fig. A-4-3)

Difference for Springs

Spring TB

Spring RS Color (Black)

Spring Tension

15. Reel S / Reel T (Fig. A-4-4)

1) Difference for Reel S / Reel T

1)Breakaway the (A) portion of the Base Assembly P4 from the embossing of the Chassis.

2)Turn the Base Assembly P4 to counterclockwise direction and lift it up.

When reassembling, confirm the (C) portion of the Arm Assembly Pinch is inserted to the Chassis hole correctly as Fig.

17. Opener Lid (Fig. A-5-2)

1)Breakaway the (B) portion of the Opener Lid from the embossing of the Chassis.

2)Turn the Opener Lid to clockwise direction and lift it up.

19. Lever T/up (Fig. A-5-4)/

Arm T/up (Fig. A-5-5)

1)Unhook the Hook(H13) of the bottom Chassis and lift the Lever T/up up.

2)Lift the Arm T/up up.

21. Lever F/R (Fig. A-6-3)

1)Unlock the Locking Tab(L1) as Fig. A-6-3 and lift the Lever F/R up.

1)Pull the Locking Tab(L2) back in direction of arrow and lift it up.

1)Remove the Washer(W2) and lift the Gear Drive up.

2)Unhook the Hook(H14) of the Gear Cam and lift the Gear Cam up.

NOTE

When reassembling, align the Gear Drive Hole(A) and the Gear Cam Hole(B) in a straight line after the Gear Drive Hole(C) is aligned with the Chassis Hole as Fig.

25. Gear Sector (Fig. A-7-3)

1)Unhook the Hook(H15) of the Base Loading on bottom Chassis and lift the Gear Sector up.

27. Lever Tension (Fig. A-7-5)

1)Unhook the (A) portion of the Lever Tension from the Hook(H16) of the Chassis.

2)Turn the Lever Tension to counterclockwise direction and lift it up.

28. Lever Spring (Fig. A-7-6)

1)Unlock the Locking Tab(L3) of the bottom Chassis and lift the Lever Spring up.

29.Gear Assembly P2 (Fig. A-8-1)/ Gear Assembly P3 (Fig. A-8-2)

1)Just lift the Gear Assembly P2 up.

2)Just lift the Gear Assembly P3 up.

NOTE

When reassembling, align the two holes of the Gear Assembly P2 and P3 in a straight line after confirmation whether the Gear Sector Hole(A) and the Plate Slider Hole(B) are aligned or not as Fig.

30. Base Assembly P2 (Fig. A-8-3)/ Base Assembly P3 (Fig. A-8-4)

1)Move the Base Assembly P2 in direction of arrow(A) along the guide hole of the Chassis and disassemble it on bottom side.

2)Move the Base Assembly P3 in direction of arrow(B) along the guide hole of the Chassis and disassemble it on bottom side.

32. Base Tension (Fig. A-9-2)

1)Breakaway the (A) portion of the Base Tension from the embossing of the Chassis.

2)Turn the Base Tension to counterclockwise direction and lift it up.

NOTE

When disassembling, be careful not to be caught the (D) part by the Chassis as Fig.

S

R

T-S H -V K

250

1)Turn the Power S/W on and eject the Cassette by press- ing the Eject Button.

2)Remove the Top Cover and Plate Assembly Top, visual- ly check if the Gear Cam Hole is aligned with the Chassis Hole as below Fig. C-2.

3)IF not, rotate the Shaft of the Loading Motor to either clockwise or counterclockwise until the alignment is as below Fig. C-2.

4)Remove the Screw which fixes the Deck Mechanism and Main Frame and confirm if the Gear Cam is aligned with the Gear Drive as below Fig. C-1(A).

5)Confirm if the Mode S/W on the Main P.C.Board is aligned as below Fig. C-1(B).

6)Remount the Deck Mechanism on the Main P.C.Board and check each operation.

CHECK DIAGRAM

Gear Cam

Mode S/W

2.Preparation for Adjustment (To set the Deck Mechanism of the loading state

without inserting a cassette tape).

1)Unplug the power cord from the AC outlet.

2)Disassemble the Top Cover and Plate Assembly Top.

3)Plug the power cord into the AC outlet.

4)Turn the power S/W on and push the Lever Stopper of the Holder Assembly CST to the back for loading the

cassette without tape.

Cover the holes of the End Sensors at the both sides of the Chassis to prevent a light leak.

Then the Deck Mechanism drives to the Stop Mode. In this case, the Deck Mechanism can accept inputs of each mode, however the Rewind and Review operation can not be performed for more than a few seconds because the Take-up Reel Table is in the Stop State and can not be detected the Reel Pulses.

The values are measured by using a Torque Gauge and Torque Gauge Adaptor with the Torque Gauge affixed.

The torque reading to measure occurs when the tape abruptly changes direction from Fast Forward to Rewind Mode, when quick braking is applied to both Reels.

Torque Gauge

Torque Gauge

Adaptor

Reel Table

S

R

T- H -V K

S

Adjustment Procedure

1)Confirm if the tape runs along the tape guide line of the Lower Drum.

2)If the tape runs the bottom of the guide line, turn the Guide Roller Height Adjustment Screw to clockwise direction.

3)If it runs the top, turn to counterclockwise direction.

4)Adjust the height of the Guide Roller to be guided to the guide line of the Lower Drum from the starting and end- ing point of the Drum.

ADJUSTMENT DIAGRAM Guide Roller Height

Adjustment screw

Upper Flange

Guide Roller

Retaining Screw

Fig. C-4-1

Adjustment Procedure/Diagrams

1)Initially adjust the Base Assembly A/C Head as shown Fig. C-5-1 by using the Height Adjustment Screw(B).

2)Play a blank tape and observe if the tape passes accu- rately over the A/C Head without tape curling or folding.

3)If folding or curling is occured then adjust the Tilt Adjustment Screw(C) while the tape is running to resem- ble Fig. C-5-3.

4)Reconfirm the tape path after Playback about 4~5 sec- onds.

NOTE

Ideal A/C head height occurs when the tape runs between 0.2~0.25mm above the bottom edge of the A/C Head core.

5-2. Confirm that the tape passes smoothly between the Take-up Guide and Pinch Roller(using a mirror or the naked eye).

1)After completing Step 5-1.(Preliminary Adjustment), check that the tape passes around the Take-up Guide and Pinch Roller without folding or curling at the top or bottom.

(1)If folding or curling is observed at the bottom of the Take-up Guide then slowly turn the Tilt Adjustment Screw(C) in the clockwise direction.

(2)If folding or curling is observed at the top of it then slowly turn the Tilt Adjustment Screw(C) in the counterclockwise direction.

NOTE:

Check the RF envelope after adjusting the A/C Head, if the RF waveform differs from Fig. C-5-4, performs Precise Adjustment to flat the RF waveform.

Adjustment Procedure

1)Connect the probe of the oscilloscope to Audio Output Jack.

2)Alternately adjust the Azimuth Adjustment Screw(A) and the Tilt Adjustment Screw(C) for maximum output of the 1KHz and 7KHz segments, while maintaining the flattest envelope differential between the two frequencies.

Fig. C-5-4

2. Required Maintenance

The recording density of a VCR(VCP) is much higher than that of an audio tape recorder. VCR(VCP) components must be very precise, at tolerances of 1/1000mm, to ensure com- patibility with the other VCRs. If any of these components are worn or dirty, the symptoms will be the same as if the part is defective. To ensure a good picture, periodic inspection and maintenance, including replacement of worn out parts and lubrication, is necessary.

3. Scheduled Maintenance

Schedules for maintenance and inspection are not fixed because they vary greatly according to the way in which the customer uses the VCR(VCP), and the environment in which the VCR(VCP) is used.

But, in general home use, a good picture will be maintained if inspection and maintenance is made every 1,000 hours. The table below shows the relation between time used and inspection period.

Table 1

Two hours

Three hours

4.Supplies Required for Inspection and Maintence

(1)Grease : Kanto G-311G (Blue) or equivalent

(2)Isopropyl Alcohol or equivalent

(3)Cleaning Patches

(4)Grease : Kanto G-381(Yellow)

5. Maintenance Procedure

5-1) Cleaning

(1)Cleaning video head

First use a cleaning tape. If the dirt on the head is too stubborn to remove by tape, use the cleaning patch. Coat the cleaning patch with Isopropyl Alcohol. Touch the cleaning patch to the head tip and gently turn the head(rotating cylinder) right and left.

(Do not move the cleaning patch vertically. Make sure that only the buckskin on the cleaning patch comes into contact with the head. Otherwise, the head may be dam- aged.)

Thoroughly dry the head. Then run the test tape. If lso- propyl Alcohol remains on the video head, the tape may be damaged when it comes into contact with the head surface.

(2)Clean the tape transport system and drive system, etc, by wiping with a cleaning patch wetted with Isopropyl Alcohol.

NOTES:

1It is the tape transport system which comes into contact with the running tape. The drive system consists of those parts which moves the tape.

2Make sure that during cleaning you do not touch the tape transport system with excessive force that would cause deformation or damage to the system.

Lever, F/R, Base, Tension

1.Deck Mechanism

A.

Auto REW doesn't work.

YES

YES

Check the syscon circuit.

B.

No F/R modes.

YES

Check the syscon power.

YES

Do the T/Up, Supply Reel rotate?

YES

Check the syscon circuit.

YES

Check the servo, power circuits.

C.

AUTO STOP. (PLAY/CUE/REV)

In Play/Cue/Rev, Is the Pinch Roller in contact with the Capstan Shaft?

YES

Are there T/up and Supply Reel pulses.

YES

Check the Syscon, ??-COM.

D.

Cassette doesn???t load.

Check alignment positions (page 4-13).

NO

NO

YES

NO

Check the Servo, Syscon.

Replace the Reel Sensor.

In PB mode Tape Presence not sensed.

NO

Is the Pinch Roller attached to the Capstan Motor Shaft?

Check Alignment positions (page 4-13).

Does the Capstan Motor turn?

YES

NO

Does the Drum Motor turn?

YES

Are there DPG, DFG pulses?

YES

Are the T/Up and Supply Reel

Sensors ok?

YES

NO

Check the Clutch and Idler

Assembly.

Is the voltage supplied to the

Capstan Motor Vcc1,Vcc2 each?

YES

YES

Replace the Capstan Motor.

NO

Is the Vcc voltage of the Drum

Check the Servo, Syscon.

Motor normal?

YES

Check the Syscon, Circuit.

2. Front Loading Mechanism

A.

Cassette cannot be inserted.

YES

YESDoes the CST IN Switch work normally?

YES

Is the Vcc of Main P.C.Board

5V?

Check the syscon circuit.

YES NO

Is the voltage between cassette

switch and GND on MainCheck the power circuit. P.C.Board 5V??

YES NO

NO

NO

Replace or add the Lever Assembly Switch Spring.

Replace the CST IN Switch.

Check the Mode switch location and syscon circuit.

B.

Is there a short circuit between cassette switch and GND on main P.C.Board?

C.

Cassette does not load.

Does the cassette insert?

YES

Does the Opener Lid work?

YES NO

Does the Gear Assembly Rack F/L work?

Replace the Opener Lid.

YES

NO

Does the Opener Door work?

YES NO

Does the Arm Assembly F/L work?

YES NO

Does the L/D Motor work?

YES NO

Does the Holder Assembly Cassette move the Arm Assembly F/L?

YES NO

Replace the Front Loading

Mechanism Assembly.

Replace the Gear Rack F/L.

Check the opener Door assembled correctly.

Replace the Arm Assembly F/L.

Check the power of L/D Motor.

Check the Holder Assembly Cassette assembled correctly.

OPTIONAL PART

401

402

002A

022

011

079

032

402008

002

004

003

405

023

012

019

018

028

021

020

4-29