Zenith ABV341 Schematic

DECK MECHANISM PARTS
LOCATIONS

• Top View..................................................5-1

• Top View(without Disc Tray) .................5-1

• Bottom View ...........................................5-1

DECK MECHANISM
DISASSEMBLY

1. Clamp Holder....................................5-2

1-1. Disc Clamp Assembly.......................5-2

1-1-1. Plate Clamp ..................................5-2

1-1-2. Magnet Clamp ..............................5-2

1-1-3. Clamp Upper.................................5-2

2. Tray Disc ...........................................5-2

3. Sled Base Assembly ........................5-3

3-1. Feed Gear Assembly........................5-3

3-2. Middle Gear Assembly......................5-3

3-3. Rack Gear Assembly........................5-3

4. Rear Rubber......................................5-3

5. Up/Down Frame Assembly..............5-4

6. Loading Belt......................................5-4

7. Pulley Gear .......................................5-4

8. Loading Gear ....................................5-4

9. Up/Down Guide.................................5-4

10. PWB Loading Assembly................5-4

11. Main Base........................................5-4

EXPLODED VIEW

1. Deck Mechanism Exploded View....5-5

CONTENTS

SECTION 5 MECHANISM OF DVD PART(NS MODEL)

5-1

DECK MECHANISM PARTS LOCATION

Starting No.

1

1, 2

1, 2, 3

1, 2, 3, 4

1

1, 6

1, 2, 6

1, 2, 6, 8

1, 2, 6, 8,

9

1, 2, 7

1, 2, 7

1, 2

1, 2 ,13

1, 2, 13, 14

1, 2, 7, 12, 13, 14

1, 2, 13

1, 2, 7, 12, 13,

14, 15, 16, 17

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

Holder

Clamp

Disc Clamp

Assembly

Plate Clamp

Magnet Clamp

Upper Clamp

Disc Tray

Sled Base Assembly

Feed Gear

Assembly

Middle

Gear

Gear Rack

Assembly

Rear Rubber

Up/Down

Faram Assembly

Loading Belt

Pulley Gear

Loading Gear

Up/Down Guide

PWB Loading

Assembly

Main Base

2 Screws,

2 Locking Tabs

4 Screws,

1 Connector

1 Locking Tabs

1 Screw

1 Screw

1 Locking Tab

1 Locking Tab

1 Locking Tab

1 Hook

2Screw

2 Locking Tabs

5-1

5-1

5-1

5-1

5-1

5-2

5-3

5-3

5-3

5-3

5-3

5-4

5-4

5-4

5-4

5-4

5-4

5-4

Bottom

Bottom

Procedure

Parts Fixing Type

Fig­ure

Disass
embly

Note

When reassembling, perform the procedure in
reverse order.

The “Bottom” on Disassembly column of above
Table indicates the part should be disassembled
at the Bottom side.

• Top View (Without Tray)

• Bottom View

• Top View (With Tray)

5-2

DECK MECHANISM DISASSEMBLY

1.Holder Clamp (Fig. 5-1)

1) Release 1 Screws(S1).

2) Unhook 2 Locking Tabs(L1).

3) Lift up the Clamp Holder and then separate it from the
Base Main.

1-1. Disc Clamp Assembly

1) Place the Disc Clamp Assembly as Fig. (A)

2) Lift up the Disc Clamp Assembly in direction of
arrow(A).

3) Separate the Disc Clamp Assembly from the Clamp
Holder.

1-1-1. Clamp Plate

1) Turn the Clamp Plate to counterclockwise direction and
then lift up the Clamp Plate.

1-1-2. Magnet Clamp
1-1-3. Upper Clamp

2. Tray Disc (Fig. 5-2)

1) Insert and push a Driver in the emergency eject
hole(A) at the right side, or put the Driver on the
Lever(B) of the Gear Emergency and pull the Lever(B)
in direction of arrow so that the Disc Tray is ejected
about 15~20mm.

2) Pull the Disc Tray until it is separated from the Base
Main completely.

(S1)

(L1)

(L1)

(Fig. A)

(A)

CLAMP HOLDER

DISC CLAMP ASSEMBLY

CLAMP HOLDER

MAIN BASE

CLAMP HOLDER

PLATE CLAMP

MAGNET CLAMP

UPPER CLAMP

Fig. 5-1 Fig. 5-2

DISC TRAY

EMERGENCY EJECT HOLE

BOTTOM SIDE VIEW

MAIN BASE

(A)

LEVER

(B)

MAIN BASE

5-3

DECK MECHANISM DISASSEMBLY

3.Sled Base Assembly (Fig. 5-3)

1) Release 4 Screw(S2).

2) Disconnect the FFC Connector(C1)

3-1. Feed Gear Assembly

1) Unhook the Locking Tab(L2) in direction of arrow.

3-2. Middle Gear
3-3. Gear Assembly Rack

1) Release the Scerw(S3)

4. Rear Rubber (Fig. 5-3)

(L2)

(S2)

(S2)

(C1)

(S2)

(S2)

(BLACK)

(GREEN)

(S3)

(BLACK)

(GREEN)

MIDDLE GEAR

GEAR RACK ASSEMBLY

GENERAL
PICK UP
ASSEMBLY

FEED GEAR ASSEMBLY

MIDDLE GEAR

GEAR RACK ASSEMBLY

SPINDLE MOTOR ASSEMBLY

REAR RUBBER

SPINDLE MOTOR ASSEMBLY

GENERAL PICK UP ASSEMBLY

BASE PU(OUTSERT)

FEED GEAR ASSEMBLY

Fig. 5-3

5-4

DECK MECHANISM DISASSEMBLY

5. Up/Down Frame Assembly (Fig. 5-4)

Put the Main Base face down(Bottom Side)

1) Release the Screw(S4)

2) Unlock the Locking Tab(L3) in direction of arrow and
then lift up the Up/Down Frame Assembly to separate
it from the Base Main.

• When reassembling move the Up/Down Guide in direction
of arrow(C) until it is positioned as Fig.(C).

• When reassembling insert (A) portion of the Frame
Assembly Up/Down in the (B) portion of theUp/Down
Guide as Fig.(B)

6. Loading Belt (Fig. 5-4)

Put the Base Main on original position(Top Side)

7. pulley Gear (Fig. 5-4)

1) Unlock the Locking Tab(L4) in direction of arrow(B) and

then separate the Pulley Gear from the Base Main.

8. Loading Gear (Fig. 5-4)

9. Up/Down Guide (Fig. 5-4)

1) Move the Up/Down Guide in direction of arrow(A) as
Fig.(A)

2) Push the Locking Tab(L5) down and then lift up the
Up/Down Guide to separate it from the Base Main.

When reassembling place the Up/Down Guide as Fig.(C)
and move it in direction arrow(B) until it is locked by the
Locking Tab(L5). And confirm the Up/Down Guide as Fig.(A)

10. PWB Assembly Loading (Fig. 5-4)

Put the Main Base face down(Bottom Side)

1) Release 2 Screws(S5)

2) Unkool the Loading Motor Connector (C2) from the
Hook (H1) on the Base Main.

3) Unlock 2 Locking Tabs(L6) and separate the PWB
Loading Assembly from the Base Main.

11. Base Main(Fig. 5-4)

Note

Note

Note

Note

Note

(L4)

(L6)

(L5)

(A)

(B)

(B)

(A)

(A)

(B)

(C)

(S5)

(C2)

(S4)

FIG. (A)

FIG. (C)

FIG. (B)

(H1)

(L6)

(L6)

(L3)

LOADING GEAR

PULLEY GEAR

PWB LOADING ASSEMBLY

LOADING BELT

MAIN BASE

UP/DOWN GUIDE

UP/DOWN GUIDE

UP/DOWN FRAME ASSEMBLY

MAIN BASE

UP/DOWN GUIDE

UP/DOWN GUIDE

Fig. 5-4

EXPLODED VIEWS

1. Deck Mechanism Exploded View

A01

A26

008

009

016

A03

010

A02

014

017

015

431

431

011

011A

430

013

432

026

430

430

012A

430

012

430

012

429

004

001

003

002

012A

018

020

429

5-5 5-6

EXPLODED VIEW

1. Deck Mechanism Exploded View .................................................................................5-1

CONTENTS

SECTION 5 MECHANISM OF DVD PART(MTK MODEL)

EXPLODED VIEWS

5-1

429

429

026

010

018

013

014

017

015

015A

011

430

431

011A

012

004

001

002

003

A01

A26

A02

020

430

430

430

430

012

021

433

433

012

012

028

022

432

024

A03

025

030

015B

015C

435

029

031

431

431

431

024A

024A

024B

1. DECK Mechanism Exploded View

DECK MECHANISM PARTS
LOCATIONS

• Top View . . . . . . . . . . . . . . . . . . . . . . . . .4-1

• Bottom View . . . . . . . . . . . . . . . . . . . . . . .4-1

DECK MECHANISM DISASSEMBLY

1. Drum Assembly . . . . . . . . . . . . . . . . . . .4-2

2. Top Plate Assembly . . . . . . . . . . . . . . . .4-4

3. CST Holder Assembly . . . . . . . . . . . . . .4-4

4. Door Opener . . . . . . . . . . . . . . . . . . . . .4-4

5. L/D Motor Bracket Assembly . . . . . . . . .4-4

6. F/L Gear Rack . . . . . . . . . . . . . . . . . . . .4-4

7. F/L Arm Assembly . . . . . . . . . . . . . . . . .4-4

8. S/W Lever Assembly . . . . . . . . . . . . . . .4-4

9. Cleaner Arm Assembly . . . . . . . . . . . . . .4-5

10. F/E Head . . . . . . . . . . . . . . . . . . . . . . . .4-5

11. A/C Head Base Assembly . . . . . . . . . . .4-5

12. T Brake Assembly . . . . . . . . . . . . . . . . .4-6

13. RS Brake Assembly . . . . . . . . . . . . . . . .4-6

14. Tension Arm Assembly . . . . . . . . . . . . . .4-6

15. S Reel / T Reel . . . . . . . . . . . . . . . . . . .4-6

16. P4 Base Assembly . . . . . . . . . . . . . . . . .4-7

17. Lid Opener . . . . . . . . . . . . . . . . . . . . . . .4-7

18. Pinch Arm Assembly . . . . . . . . . . . . . . .4-7

19. T/up / Arm T/up Lever . . . . . . . . . . . . . .4-7

20. Capstan Belt /Capstan Motor . . . . . . . . .4-8

21. F/R Lever . . . . . . . . . . . . . . . . . . . . . . . .4-8

22. D35 Clutch Assembly . . . . . . . . . . . . . . .4-8

23. Capstan Brake Assembly . . . . . . . . . . . .4-8

24. Drive Gear / Cam Gear . . . . . . . . . . . . .4-9

25. Sector Gear . . . . . . . . . . . . . . . . . . . . . .4-9

26. Slider Plate . . . . . . . . . . . . . . . . . . . . . .4-9

27. Tension Lever . . . . . . . . . . . . . . . . . . . .4-9

28. Spring Lever . . . . . . . . . . . . . . . . . . . . .4-9

29. P2 Gear Assembly/

P3 Gear Assembly . . . . . . . . . . . . . . . .4-10

30. P2 Base Assembly/

P3 Base Assembly . . . . . . . . . . . . . . . .4-10

31. Loading Base . . . . . . . . . . . . . . . . . . . .4-11

32. Tension Base . . . . . . . . . . . . . . . . . . . .4-11

33. Idler Arm Jog Assembly . . . . . . . . . . . .4-11

DECK MECHANISM ADJUSTMENT

• Tools and Fixtures for Service . . . . . . .4-12

1. Mechanism Alignment Position Check .4-13

2. Preparation for Adjustment . . . . . . . . . .4-14

3. Checking Torque . . . . . . . . . . . . . . . . .4-14

4. Guide Roller Height Adjustment . . . . . .4-15

4-1. Preliminary Adjustment . . . . . . . . .4-15

4-2. Precise Adjustment . . . . . . . . . . . .4-15

5. Audio/Control (A/C) Head Adjustment . .4-16

5-1. Preliminary Adjustment . . . . . . . . .4-16

5-2. Confirmation of Tape Path between

Pinch Roller and Take-up Guide . .4-17

5-3. Precise Adjustment

(Azimuth Adjustment) . . . . . . . . . .4-17

6. X-Value Adjustment . . . . . . . . . . . . . . .4-17

7. Adjustment after Replacing Drum Assembly

(Video Heads) . . . . . . . . . . . . . . . . . . .4-18

8. Check the Tape Travel after Reassembling

Deck Mechanism . . . . . . . . . . . . . . . . .4-18

8-1. Check Audio and RF Locking Time

during Playback after CUE or REV

. . . . . . . . . . . . . . . . . . . . . . . . . . .4-18

8-2. Check Tape Curling or Jamming . .4-18

MAINTENANCE/INSPECTION
PROCEDURE

1. Check before starting Repairs . . . . . . .4-19

2. Required Maintenance . . . . . . . . . . . . .4-20

3. Scheduled Maintenance . . . . . . . . . . . .4-20

4. Supplies Required for Inspection and

Maintenance . . . . . . . . . . . . . . . . . . . .4-20

5. Maintenance Procedure . . . . . . . . . . . .4-20

5-1. Cleaning . . . . . . . . . . . . . . . . . . . .4-20

5-2. Greasing . . . . . . . . . . . . . . . . . . . .4-21

MECHANISM TROUBLESHOOTING
GUIDE

1. Deck Mechanism . . . . . . . . . . . . . . . . .4-23

2. Front Loading Mechanism . . . . . . . . . .4-26

EXPLODED VIEWS

1. Front Loading Mechanism Section . . . .4-28

2. Moving Mechanism Section (1) . . . . . . .4-29

3. Moving Mechanism Section (2) . . . . . . .4-30

CONTENTS

SECTION 4 MECHANISM OF VCR PART

DECK MECHANISM PARTS LOCATIONS

4-1

• Top View

• Bottom View

20

24

23

20

24

22

21

29

30

29

30

25
32
27
26
28

NOTE: When reassembly perform the

procedure in the reverse order.

1 Drum Assembly 3 Screw A-1 T

2 Top Plate Assembly 2 Hook A-2 T

2 3 CST Holder Assembly Chassis Hole A-2 T

2 4 Door Opener Chassis Hole A-2 T

5 L/D Motor Bracket 3 Hook A-2 T

Assembly

2,3,4 6 F/L Gear Rack 1 Hook, Chassis Hole A-2 T

2,3,4,6 7 F/L Arm Assembly Chassis Hole A-2 T

8 S/W Lever Assembly 1 Hook A-2 T

9 Cleaner Arm Assembly Chassis Embossing A-3 T

10 F/E Head Chassis Embossing A-3 T

11 A/C Head Base Assembly 1 Screw A-3 T

2,3 12 T Brake Assembly 1 Hook A-4 T

2,3 13 RS Brake Assembly 1 Hook A-4 T

2,3 14 Tension Arm Assembly 2 Hook A-4 T

2,3,12,13, 15 S Reel / T Reel A-4 T

14

16 P4 Base Assembly Chassis Embossing A-5 T

17 Lid Opener Chassis Embossing A-5 T

17 18 Pinch Arm Assembly Shaft A-5 T

17 19 T/up / Arm T/up Lever 1 Hook A-5 T

17,18 20

Capstan Belt /Capstan Motor

3 Screw A-6 B

21 F/R Lever Locking Tab A-6 B

20, 21 22 D35 Clutch Assembly Washer A-6 B

23 Capstan Brake Assembly Locking Tab A-6 B

24 Drive Gear / Cam Gear Washer/Hook A-7 B

25 Sector Gear 1 Hook A-7 B

20,21,23, 26 Slider Plate Shaft Guide A-7 B

24,25

20,21,23, 27 Tension Lever 1 Hook A-7 B

24,25,26

2,3,14,20, 28 Spring Lever Locking Tab A7 B

21,25,23,

24,26

25 29

P2 Gear Assembly/P3 Gear Assembly

Boss A-8 B

2,3,14,25, 30

P2 Base Assembly/P3 Base Assembly

Chassis Slot A-8 B

29

2,3,14,25, 31 Loading Base 1 Screw A-9 T

29

2,3,14 32 Tension Base Chassis Embossing A-9 B

2,3,20,21, 33 Idler Arm Jog Assembly Locking Tab A-9 T

22

Starting
No.

Procedure

Part Fixing Type

Fig-

ure

1) When reassembling, confirm Mechanism and Mode
Switch Alignment Position (Refer to Page 4-14)

2) When disassembling, the Parts in the "Starting No."
colum should be removed first.

R: Top, B:Bottom

2

7

10

1

31

14

15

8

6

3

4

9

5

11

18

16

17
19
19

12

33

13

15

4-2

DECK MECHANISM DISASSEMBLY

(S3)

(S2)

(S2)

(S3)

(A)

Stator

Carbon Brush

Drum Motor

Rotor

Drum Sub Assembly

FPC Drum

(S1)

(S1)

(S1)

FPC Holder

H1

H2

1. Drum Assembly (Fig. A-1-1)

1) Unplug the FPC Drum Connector.

2) Remove three Screws (S1) on the bottom side and sep­arate the Drum assembly.

3) Unhook (H1), (H2) and separate the FPC Holder and
FPC Cap. (See Fig. B-1)

1-1. Drum Motor

1) Remove two Screws (S2) and disassemble the Stator of
the Drum Motor.

(2) Remove two Screws (S3) and separate the Rotor of the

Drum Motor from the Drum Sub assembly.

When reassembling, check to ascertain that the Carbon
Brush is in position.

Fig. A-1

NOTE

(Fig. B-1)

FPC Holder

FPC Drum

FPC Cap

Figure in the opposite direction

(Fig. A-1-1)

DECK MECHANISM DISASSEMBLY

4-3

(B)

(E)

(C1)

(C)

Top Plate

F/L Arm Assembly

S/W Spring Lever

F/L Gear Rack Assembly

Chassis

Door Opener

L/D Motor Bracket Assembly

CST Holder Assembly

(B')

(C')

(D)

(E')

(H6)

(A)

(B)

S/W Lever Assembly

(H8)

Fig. A-2

(Fig. A-2-1)

(Fig. A-2-2)

(Fig. A-2-6)

(Fig. A-2-7)

(Fig. A-2-5)

(Fig. A-2-3)

(Fig. A-2-4)

4-4

DECK MECHANISM DISASSEMBLY

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

1) Pull the (B) portion of the Top Plate 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.
(Tools: (-) Flat type screwdrive, anything tool with sharp
point or flat point.)

(1) When reassembling, push the Top Plate on after aligning

the two position (C), (C’) as Fig.

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

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

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

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

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

5. L/D Motor Bracket Assembly
(Fig. A-2-4)

1) Unplug the Connector (C1).

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

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

1) Move the F/L Gear Assembly Rack in the direction of

arrow (A) and unhook the Hook (H6) pulling back in front.

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

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

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

1) Move the F/L Arm Assembly in direction of arrow and

separate the left side of it first.

2) Disassemble the F/L Arm Assembly from each guided

Holes in of the Chassis.

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

1) Hook the S/W Spring Lever on the Hook (H7) first as

shown below.

2) Unhook the Hook (H8) in the left side of the Chassis and

move the S/W Lever Assembly.

(B')

(C')

(C)

(B)

NOTE

NOTE

(H3)

(H4)

(H5)

Bracket assembly L/M

NOTE

F/L Gear Rack

Holder assembly CST

(D)

Chassis

Drive Gear

Chassis

(H8)

(H7)

S/W Spring Lever

DECK MECHANISM DISASSEMBLY

4-5

9. Cleaner Arm Assembly (Fig. A-3-1)

1) Carefully pry tab "A" (see Fig.A-3-1) to clear the
embossed tab on the chassis. Turn the Cleaner Arm
Assembly clockwise and lift it from the chassis.

10. F/E Head (Fig. A-3-2)

1) Carefully pry tab "A" (see Fig.A-3-2) to clear the
embossed tab on the chassis. Turn the Cleaner Arm
Assembly counter-clockwise and lift it from the chassis.

11. A/C Head Base Assembly (Fig. A-3-3)

1) Remove the Screw (S4) and lift the A/C Head Base
Assembly up.

(A)

Cleaner

Arm Assembly

A/C Head Base Assembly

(S4)

F/E Head

(A)

Chassis

Fig. A-3

(Fig. A-3-1)

(Fig. A-3-3)

(Fig. A-3-2)

4-6

DECK MECHANISM DISASSEMBLY

T Brake Assembly

TB Spring

(H9)

T Reel

RS Brake Assembly

RS Spring

Tension Arm Assembly

Tension Spring

S Reel

Tension Base

(H11)

(H12)

Chassis

(H10)

Fig. A-4

12. T Brake Assembly (Fig. A-4-1)

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

2) LLift the T Brake Assembly up.

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

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

2) Lift the T Brake Assembly up.

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

1) Unhook the Tension Spring from the Hook (H11) of the
Tension Arm Assembly.

2) Unhook the Hook (H12) of the Tension Base and lift the
Tension Arm Assembly up.

Difference for Springs

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

1) Difference for S Reel / T Reel

TB Spring
RS Spring
Tension Spring

(Difference for Springs)

Color (Black)

S Reel T Reel

NOTE

(Fig. A-4-1)

(Fig. A-4-3)

(Fig. A-4-4)

(Fig. A-4-4)

(Fig. A-4-2)

DECK MECHANISM DISASSEMBLY

4-7

Lid Opener

Pinch Arm

Assembly

P4 Base Assembly

T/up Arm

T/up Lever

(A)

(B)

(C)

(C)

(H13)

(B)

(H13)

Chassis

Fig. A-5

16. P4 Base Assembly (Fig. A-5-1)

1) Carefully pry the (A) portion of the P4 Base Assembly
from the Embossing of the Chassis.

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

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

1) Carefully pry the (B) portion of the Lid Opener from the
Embossing of the Chassis.

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

18. Pinch Arm Assembly (Fig. A-5-3)

1) Lift the Pinch Arm Assembly up.

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

1) Unhook the Hook (H13) of the bottom Chassis and lift the

T/up Lever up.

2) Lift the T/up Arm up.

When reassembling, confirm the (C) portion of the Pinch Arm
Assembly is inserted in the Chassis Hole correctly.

Place the Mechanism face down, or up side down.

NOTE

(Fig. A-5-2)

(Fig. A-5-1)

(Fig. A-5-3)

(Fig. A-5-5)

(Fig. A-5-4)

4-8

DECK MECHANISM DISASSEMBLY

Chassis

(S5)

Capstan Belt

Capstan Motor

Washer(W1)

F/R Lever

D35 Clutch Assembly

Capstan Brake Assembly

(L1)

(L2)

(L1)

Fig. A-6

20. Capstan Belt (Fig. A-6-1)/
Capstan Motor (Fig. A-6-2)

1) Remove the Capstan Belt..

2) Remove the three Screws (S5) from the bottom of the

Chassis and lift the Capstan Motor up.

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

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

Lever up.

22. D35 Clutch assembly (Fig. A-6-4)

1) Remove the Washer (W1) and lift the D35 Clutch
Assembly up.

23. Capstan Brake Assembly

(Fig. A-6-5)

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

(Fig. A-6-1)

(Fig. A-6-2)

(Fig. A-6-3)

(Fig. A-6-5)

(Fig. A-6-4)

DECK MECHANISM DISASSEMBLY

4-9

Drive Gear

Washer (W2)

Cam Gear

Slider Plate

Tension Lever

Spring Lever

Loading Base

Sector Gear

(L3)

(H15)

(H16)

(H14)

(A)

Chassis

Drive Gear Hole(C)

Cam Gear Hole(B)

Drive Gear Hole(A)

Fig. A-7

24. Drive Gear (Fig. A-7-1)/
Cam Gear (Fig. A-7-2)

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

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

Gear up.

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

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

1) Unhook the Hook (H15) of the Loading Base on bottom

Chassis and lift the Sector Gear up.

26. Slider Plate (Fig. A-7-4)

1) Lift the Slider Plate up.

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

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

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

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

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

(Fig. A-7-4)

(Fig. A-7-5)

(Fig. A-7-6)

(Fig. A-7-1)

(Fig. A-7-2)

(Fig. A-7-3)

NOTE

4-10

DECK MECHANISM DISASSEMBLY

P3 Gear Assembly

P2 Gear Assembly

P2 Base Assembly

P3 Base Assembly

(A)

(B)

Chassis

P2 Gear Assembly Hole

Sector Gear Hole(A)

Slider Plate Hole(B)

Spring Lever Boss

P3 Gear Assembly Hole

Fig. A-8

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

1) Lift the P2 Gear Assembly up.

2) Lift the P3 Gear Assembly up.

When reassembling, align the two Holes of the P2 and P3
Gear Assembly in a straight line after confirming the Sector
Gear Hole (A) and the Slider Plate Hole (B) are aligned as in
the above Fig.

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

1) Move the P2 Base Assembly in the direction of the arrow

(A) along the slot of the Chassis and disassemble it from
the bottom side.

2) Move the P3 Base Assembly in the direction of the arrow

(B) along the slot of the Chassis and disassemble it from
the bottom side.

Place the Mechanism face up, or return to it's original
position.

NOTE

(Fig. A-8-1)

(Fig. A-8-2)

(Fig. A-8-3)

(Fig. A-8-4)

DECK MECHANISM DISASSEMBLY

4-11

(A)

(B) (C)

(S7)

Idler Arm Jog Assembly

Loading Base

Tension Base

Chassis

(D)

Fig. A-9

31. Loading Base (Fig. A-9-1)

1) Remove the Screw (S7).

2) Lift the Loading Base up.

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

1) Remove the (A) portion of the Tension Base from the
Embossing of the Chassis.

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

33. Idler Arm Jog Assembly (Fig. A-9-3)

1) Pinch (B) and (C), as shown in Fig. A-9-3.

2) Lift the Idler Arm Assembly up.

When disassembling, be careful not to catxh part (D) on the
Chassis (see inset).

NOTE

(Fig. A-9-1)

(Fig. A-9-2)

(Fig. A-9-3)

DECK MECHANISM DISASSEMBLY

4-12

• Tools and Fixfures for Service

1. Cassette Torque meter

1. SRK-VHT-303 (Not SVC part)

1. Parts No: D00-D006

4. Torque gauge adaptor
Parts No:D09-R001

5. Post height adjusting driver
Parts No:DTL-0005

6. + Type driver (ø 5)

2. Alignment tape
Parts No NTSC: DTN-001
PAL:DTN-0002

3. Torque gauge

3. 600g.Cm ATG

3. Parts No:D00-D002

SRK

V

ID

E

O

C

A

S

S

E

T

T

E

T

O

R

Q

U

E

M

E

T

E

R

V

H

T-30

3

S

R

K

-

V

H

T

-

S

S

R

K

-

V

H

T

­T

300

250

200
1

50

5

0

0

300

250

2

00

15

0

50

0

1

00

DECK MECHANISM ADJUSTMENT

4-13

Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected.

1. Mechanism Alignment position Check

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

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

3) If not, rotate the Shaft of the Loading Motor Clockwise or
Counterclockwise until the Alignment is as shown below
in Fig. C-2.

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

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

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

Cam Gear

Drive Gear

(C)

Mode S/W

(B)

Test Equipment/ Fixture

• Blank tape

Test Conditions (Mechanism

Condition)

• Eject Mode (with Cassette ejected)

Check Point

• Mechanism and Mode Switch Position

Fig. C-1

Fig. C-2

CHECK DIAGRAM

BOTTOM VIEW

TOP VIEW

Gear Cam (o) and Gear Drive (o) groove alignment

L/D Motor Assembly

(A')

(B')

Cam Gear

Chassis Hole

(B)

(A)

Cam Gear Hole Cam Gear Hole

4-14

DECK MECHANISM ADJUSTMENT

Purpose: To insure smooth Transport of the Tape during each Mode of Operation.

If the Tape Transport is abnormal, then check the Torque as indicated by the chart below.

2. Preparation for Adjustment (To set the
Deck Mechanism to the Loading state
without inserting a Cassette Tape).

1) Unplug the Power Cord from the AC Outlet.

2) Disassemble the Top Cover and Top Plate Assembly.

3) Plug the Power Cord into the AC Outlet.

4) Turn the Power S/W. Push the Stop Lever of the CST
Holder Assembly to the back for Loading without the

Tape.
Cover the Holes of the End Sensors at the both sides of
the (L) Side Bracket and Door Bracket Assembly 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 Mode
and can not detect the Reel Pulses.

3. Checking Torque

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 of Rewind
Mode, when quick bracking is applied to both Reels.

SRK

VIDEO

CASSETTE
TORQUE
METER

VHT-303

S

R

K

-

V

H

T

-

S

S

R

K

-

V

H

T

­T

300

250

200

150

50

0

300

250

200

150

50

0

100

Test Equipment/ Fixture

• Torque Gauge (600g/cm ATG)

• Torque Gauge Adaptor

• Cassette Torque Meter

SRK-VHT-303

Checking Method

• Perform each Deck Mechanism Mode without
inserting a Cassette Tape (Refer to above No.2
Preparation for Adjustment).

• Read the Measurement of the Take-up or Supply
Reels on the Cassette Torque Meter (Fig. C-3-2).

• Attach the Torque Gauge Adaptor to the Torque
Gauge and then read the Value of it (Fig. C-3-1).

NOTE:

Fig. C-3-2 Fig. C-3-1

Torque Gauge

Torque Gauge
Adaptor

Reel Table

Item

Fast Forward Torque

Rewind Torque

Play Take-Up Torque

Review Torque

Mode

Fast Forward

Rewind

Play

Review

Test Equipment

Cassette Torque Gauge

Cassette Torque Gauge

Cassette Torque Meter

Cassette Torque Meter

Measurement Reel

Take-Up Reel

Supply Reel

Take-Up Reel

Supply Reel

Measurement Values

More than 400g/cm

More than 400g/cm

40~100g/cm

120~210g/cm

Test Conditions

(Mechanism Condition)

• Play (FF) or Review (REW) Mode

NOTE:

• Cassette Torque Meter (SRK-VHT-303)

• Torque Gauge (600g.cm ATG)

DECK MECHANISM ADJUSTMENT

4-15

4.Guide Roller Height Adjustment

Adjustment Procedure

1) Confirm that the Tape runs along the Tape Guide Line of the
Lower Drum.

2) If the Tape runs at the Bottom of the Guide Line, turn the
Guide Roller Height Adjustment Screw Clockwise.

3) If it runs at the Top, turn Counterclockwise.

4) Adjust the Height of the Guide Roller to be guided to the
Guide Line of the Lower Drum from the Starting and Ending
Point of the Drum.

Purpose: To regulate the Height of the Tape so that the Bottom of the Tape runs along the

Tape Guide Line on the Lower Drum.

Test Equipment/ Fixture

• Post Height Adjusting Driver

Test Conditions (Mechanism Condition)

• Play or Review Mode

Adjustment Point

• Guide Roller Height Adjustment
screws on the Supply and Take-Up
Guide Rollers.

Fig. C-4-1

Upper Flange

Guide Roller
Retaining Screw

Guide Roller Height
Adjustment screw

ADJUSTMENT DIAGRAM

Test Equipment/Fixture

• Oscilloscope

• Alignment Tape

• Post Height Adjusting

Driver

Test Equipment Connection Points

• CH-1:PB RF Envelope

• CH-2:NTSC: SW 30Hz

PAL: SW 25Hz

• Head Switching Output
Point

• RF Envelope Output
Point

Test Conditions VCR (VCP) State

• Play an Alignment Tape

Adjustment Point

• Guide Roller Height
Adjustment Screws

Fig. C-4-2

Fig. C-4-3

P3 POST
ADJUSTMENT

P2 POST
ADJUSTMENT

Turn the Roller Guide Height
Adjustment Screw slightly
to flatten the waveform.

Tracking control at center

RF ENVELOPE OUTPUT TEST POINT

OSCILLOSCOPE

HEAD SWITCHING OUTPUT TEST
POINT

Turn (Move) the tracking
control to both directions

4-1. Preliminary Adjustment

4-2. Precise Adjustment

Adjustment Procedure

1) Play an Alignment Tape after connecting the Probe of the
Oscilloscope to the RF Envelope Output Test Point and
Head Switching Output Test Point.

2) Tracking Control (in PB Mode): Center Position (When
this Adjustment is performed after the Drum Assembly
has been replaced, set the Tracking Control so that the
RF Output is Maximum).

3) Height Adjustment Screw: Flatten the RF Waveform.
(Fig. C-4-2)

4) Turn (Move) the Tracking Control (in PB Mode)
Clockwise and Counterclockwise. (Fig. C-4-3)

5) Check that any Drop of RF Output is uniform at the
Start and End of the Waveform.

If the adjustment is excessive or insufficient the tape
will jam or fold.

NOTE

Waveform Diagrams

Connection Diagram

4-16

DECK MECHANISM ADJUSTMENT

5. Audio/Control (A/C) Head Adjustment

10.9

Purpose: To insure that the Tape passes accurately over the Audio and Control Tracks in

exact alignment in both the Record and Playback Modes.

Test Equipment/ Fixture

• Blank Tape

• Screw Driver (+) Type 5mm

• Play the blank tape

Test Conditions (Mechanism Condition)

Adjustment Point

• Tilt Adjustment Screw (C)

• Height Adjustment Screw (B)

• Azimuth Adjustment Screw (A)

Fig. C-5-1

A/C Head Base

Fig. C-5-2

Height Adjustment

Screw (B)

Tilt Adjustment

Screw (C)

Azimuth Adjustment
Screw (A)

X-Value Adjustment
Hole

Fixed Screw

Fig. C-5-3

A/C Head

Tap e

Tape

0.2~0.25mm

P4

5-1. Preliminary Adjustment (Height and Tilt Adjustment)

Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape.

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

2) Play a Blank Tape and observe if the Tape passes accu­rately over the A/C Head without the Tape Curling or
Folding.

3) If Folding or Curling occurs adjust the Tilt Adjustment
Screw (C) while the Tape is running to resemble Fig. C­5-3.

4) Reconfirm the Tape Path after playback of approximate­ly 4~5 seconds.

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.

NOTE

Adjustment Procedure/Diagrams

A/C Head Assembly

DECK MECHANISM ADJUSTMENT

4-17

Purpose: To obtain compatibility with other VCR (VCP) Models.

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.

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.

Test Equipment/ Fixture

• Oscilloscope

• Alignment Tape (SP)

• Screw Driver (+) Type 5mm

Connection Point

• Audio output jack

Test Conditions

(Mechanism Condition)

• Play an Alignment Tape
1KHz, 7KHz Sections

Adjustment Point

• Azimuth Adjustment Screw (A)

• Height Adjustment Screw (B)

1) Connect the Probe of the Oscilloscope to the 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.

Adjustment Procedure

5-3. Precise Adjustment (Azimuth adjustment)

6. X-Value Adjustment

Fig. C-5-4

1KHZ

• Oscilloscope

• Alignment tape (SP only)

• Screw Driver (+) Type 5mm

• CH-1: PB RF Envelope

• CH-2: NTSC: SW 30Hz

PAL: SW 25Hz

• Head Switching Output
Test Point

• RF Envelope Output Test
Point

Test Conditions

(Mechanism Condition)

• Play an Alignment Tape

Adjustment PointConnection PointTest Equipment/ Fixture

Adjustment Procedure

1) Release the Automatic Tracking to run long enough for
Tracking to complete it’s Cycle.

2) Loosen the Fixed Mounting Screw and move the A/C
Head Base Assembly in the direction as shown in the
Diagram to find the center of the peak that allows for the
maximum Waveform Envelope.
This method should allow the 31um Head to be centrally
located over the 58um Tape Track.

3) Tighten the A/C Head Base Assembly mounting Screw.

7KHZ

A:Maximum

B:Maximum

Left

Right

Groove at the
Base A/C

Height Adjustment Screw (B)

Tilt Adjustment Screw (C)

Azimuth Adjustment
Screw (A)

X-Value Adjustment Hole

Fixed Screw

RF ENVELOPE OUTPUT TEST POINT

OSCILLOSCOPE

HEAD SWITCHING OUTPUT TEST POINT

Connection Diagram

Adjustment Diagram

NOTE:

CH-1

CH-2

4-18

DECK MECHANISM ADJUSTMENT

Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.

8-2. Check for tape curling or jamming

Test Equipment/ Fixture

• T-160 Tape

• T-120 Tape

Specification

• Be sure there is no tape jamming or curling at
the begining, middle or end of the tape.

VCR(VCP) State

•

Run the CUE, REV play mode at the
beginning and the end of the tape.

Test Conditions (Mechanism Condition)

1) Confirm that the tape runs smoothly around the roller
guides, drum and A/C head assemblies while abruptly
changing operating modes from Play to CUE or REV.
This is to be checked at the begining, middle and end
sections of the cassette.

2) Confirm that the tape passes over the A/C head assem­bly as indicated by proper audio reproduction and prop­er tape counter performance.

Checking Procedure

7. Adjustment after Replacing Drum Assembly (Video Heads)

Test Equipment/ Fixture

• Oscilloscope

• Alignment tapes

• Blank Tape

• Post Height Adjusting Driver

• Screw Driver (+) Type 5mm

Connection Point

• CH-1: PB RF Envelope

• CH-2: NTSC: SW 30Hz

PAL: SW 25Hz

• Head Switching Output
Test Point

• RF Envelope Output Test Point

Test Conditions

(Mechanism Condition)

• Play the blank tape

• Play an alignment tape

Adjustment Points

• Guide Roller Precise
Adjustment

• Switching Point

• Tracking Preset

• X-Value

Checking/Adjustment Procedure

Play a blank tape and check for tape curling or creasing around
the roller guide. If there is a problem, follow the procedure 4.
"Guide Roller Height" and 5. "Audio Control (A/C) Head
Adjustment".

RF ENVELOPE OUTPUT TEST POINT

OSCILLOSCOPE

HEAD SWITCHING OUTPUT TEST
POINT

Connection Diagram

Waveform

V1/V MAX EE0.7

V2/V MAX EE0.8
RF ENVELOPE OUTPUT

Fig. C-7

8. Check the Tape Travel after Reassembling Deck Assembly.

8-1. Check Audio and RF Locking Time during playback and after CUE or REV (FF/REW)

Test Equipment/ Fixture

• Oscilloscope

• Alignment tapes (with 6H

3kHz Color Bar Signal)

• Stop Watch

Specification

• RF Locking Time: Less than 5
sec.

• Audio Locking Time:Less than
10sec

Test Equipment

Connection Points

• CH-1: PB RF Envelope

• CH-2: Audio Output

• RF Envelope Output Point

• Audio Output Jack

Test Conditions

(Mechanism Condition)

• Play an alignment tape
(with 6H 3kHz Color Bar
Signal)

Checking Procedure

Play an alignment tape then change the operating mode to
CUE or REV and confirm if the unit meets the above listed
specifications.

1) CUE is fast forward mode (FF)

2) REV is the rewind mode (REW)

3) Referenced to the Play mode

NOTES:

V1

V

V2

CH1 CH2

Connection Points

MAINTENANCE/INSPECTION PROCEDURE

4-19

(3) F/E Head

(5) Drum Assembly

(Video Head)

(4) P2 Base

Assembly

(2) Tension Post

(1) Supply Reel

(6) P3 Base Assembly

The following faults can be remedied by cleaning and oil­ing. Check the needed lubrication and the conditions of
cleanliness in the unit.
Check with the customer to find out how often the unit is
used, and then determine that the unit is ready for inspec­tion and maintenance. Check the following parts.

1 Check before starting repairs

Phenomenon Inspection

Replace-

ment

Color beats Dirt on full-erase head

o

Poor S/N, no color

Dirt on video head

Vertical or
Horizontal jitter

Dirt on Audio/control head

Dirt on pinch roller

If locations marked with o do not operate normally after
cleaning, check for wear and replace.
See the EXPLODED VIEWS at the end of this manual as
well as the above illustrations See the Greasing (Page 4-22)
for the sections to be lubricated and greased.

NOTE

o

o

o

o

Dirt on video head

Dirt on tape transport system

Low volume,

Sound distorted

Tape does not run.

Tape is slack

o

In Review and
Unloading (off mode),
the Tape is rolled up
loosely.

Clutch Assembly D33K
Torque reduced

Cleaning Drum and
transport system

Fig. C-9-3

(7) A/C Head

(8) P4 Post

(10) Pinch Roller

(11) Take-up Guide Post

(9) Capstan Shaft

(12) Take-up Reel

* No. (1) ~ (13) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel.

Fig. C-9-1 Top View

Fig. C-9-2 Bottom View

F/E Head

Video Head

A/C Head

Pinch Roller

Belt Capston

Clutch

Assembly D33K

Fig. C-9-3 Tape Transport System

MAINTENANCE/INSPECTION PROCEDURE

4-20

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 com­patiblity with 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.

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

(1) Grease: Kanto G-311G (Blue) or equivalent
(2) Isopropyl Alcohol or equivalent
(3) Cleaning Patches
(4) Grease: Kanto G-381 (Yellow)

(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 dam­aged.)
Thoroughly dry the head. Then run the test tape. If lso­propyl 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 Isporopyl
Alcohol.

1 It is the tape transport system which comes into contact

with the running tape. The drive system consists of those
parts which moves the tape.

2 Make sure that during cleaning you do not touch the tape

transport system with the tip of a screw driver and no that
force is that would cause deforming or damage applied to
the system.

2. Required Maintenance

3. Scheduled Maintenance

5) Maintenance Procedure
5-1) Cleaning

NOTES:

About 1

year

One hour

Two hours

Three hours

When

inspection is

necessary

Average
hours used
per day

About 18

months

About 3

years

4. Supplies Required for Inspection and
Maintence

Fig. C-9-4

Drum
(Rotating Cylinder)

Head Tip

Coat With Isopropyl Alcohol

Touch this section of cleaning
patch to the head tip and gently
turn the Drum (Rotating Cylinder)

Cleaning Patch

MAINTENANCE/INSPECTION PROCEDURE

4-21

(1) Greasing guidelines

Apply grease, with a cleaning patch. Do not use excess
grease. It may come into contact with the tape path or
drive system. If this occurs wipe off any excess and
clean with cleaning patch using Isopropyl Alcohol.

(2) Periodic greasing

Grease specified locations every 5,000 hours.

5-2) Greasing

NOTE:Greasing Points

3

5

6

1

2

4

1) Loading Path Inside & Top side

2) Tension Base Boss inside Hole

3) F/L Arm Assembly "U" Groove

4) Take-up Arm Rubbing Section

5) L/D Motor Gear Wheel Part

6) Shaft

7) F/L Arm Assembly of Buming
Inside Hole

8) S Reel, T Shaft (G381:Yellow)

9) Brake T Groove

Loading Base

Drive Gear

Sector Gear

Cam Gear

Gear Part

(L) Side Bracket

Door Bracket Assembly

5

7

8

1

2

6

4

3

1) Loading Path Inside & Top side

2) Shaft

3) F/L Gear Rack Moving Section

4) Shaft

5) Tension Lever Groove

6) D33 Clutch Assembly Shaft

7) "S" Brake Rubbing Section

Chassis (Top)

Chassis (Bottom)

F/L Guide Rack F/L Gear Rack

Guide Rail

4-22

GEAR , F/R GEAR AY, P2 & P3

F/R Lever

Tension Base

Boss CAM

MECHANISM TROUBLESHOOTING GUIDE

4-23

Auto REW doesn't work.

Is the supply to the END sensor

END sensor "H"?

“H”: more than 3.5V

“L”: less than 0.7V~1V

Is the voltage across IR LED

between 0.8~1.5V?

Replace LED.

Is the Vcc. voltage of End

sensor 5V?

Check the syscon power.

Replace End sensor.

Check syscon circuit.

NO

YES

YES

YES

NO

NO

NO

1.Deck Mechanism

A.

NO

NO

NO

No F/R modes.

Is the present mode,

F/R Mode?

Is the mode SW assembled

correctly (refer to Pages 4-14.)

Is the normal voltage supplied to

the Capstan Motor Vcc1, Vcc2.?

Check Servo, Power Circuits.

Replace the Capstan Motor.

Does the Capstan Motor rotate?

Is terminal voltage (Vctl) of Capstan

Motor supply side more than 4V?

Does the T/Up, Supply Reel

rotate?

Check syscon circuit.

YES

YES

YES

YES

YES

YES

B.

4-24

MECHANISM TROUBLESHOOTING GUIDE

AUTO STOP.

(PLAY/CUE/REV)

Are there T/up and supply reel
pulses.

In Play/Cue/Rev is the pinch

roller in contact with the capstan

shaft.

Replace Reel Sensor.

Is the output of DFG, DPG OK?

Check aligment positions (page 4-

14) Check Pinch spring.

Replace Drum Motor.

Check Servo, Syscon.

Check the Syscon, µ-COM.

No cassette loading.

Insert the cassette.

Check CST Holder Assembly.

Is there variation for CST IN S/W

Output?

(In Tape with REC Tab

“L”→“H”→“L”)

(In Tape without REC Tab

“L”→“H”→“L”→“H”)

Does the CST IN S/W work
normally?

Does the lever Assembly S/W
work normally.

Check Syscon Circuit.

Check Syscon Circuit.

Replace CST IN S/W.

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

NO

NO

YES

C.

D.

4-25

MECHANISM TROUBLESHOOTING GUIDE

In PB mode Tape Presence

not sensed.

Is the Pinch Roller attached

to the Capstan Motor Shaft?

Check Alignment positions

(page 4-14)

Does the T/Up

Reel turn?

Replace the Belt.

Is the Belt ok?

Does the Drum

Motor turn?

Are there DPG,

DFG Pulses?

Are the T/Up Supply Reel Sensors

ok?

Check Syscon,

Circuit.

Check Syscon,

Circuit.

Check Servo, Syscon.

Does the Capstan Motor turn?

Is the terminal voltage of the

Drum Motor more than 2.3V?

Replace the

Drum Motor.

Is the Vcc voltage of the Drum

Motor normal?

Check the clutch and the Idler

Assembly.

YES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

Is the terminal voltage of Capstan

Motor supplied more than 4V?

Replace the

Capstan Motor.

Is the Voltage supplied to the

Capstan Motor Vcc1,Vcc2 each?

YES

YES

YES

Check Servo,

Power.

NO

NO

NO

E.

MECHANISM TROUBLESHOOTING GUIDE

4-26

Cassette cannot be inserted.

Does the Lever Assembly
Switch work?

Is the Lever Assembly Switch
Spring damaged or omitted?

Does the CST IN Switch work
normally?

Replace or add the Lever
Assembly Switch Spring.

Is the Vcc of Main P.C.Board

5V?

YES

YES

Check syscon circuit.

YES

Check power circuit.

NO

Is the voltage between cassette

switch and GND on Main

P.C.Board 5V??

YES

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

Remove the short circuit part or
Replace the main P.C.Board.

NO

Check Mode switch location and

syscon circuit.

Replace CST IN Switch.

YES

NO

YES

NO

NO

Replace CST IN Switch.

NO

NO

Cassette will not eject.

Does the L/D motor rotate in reverse?

Check L/D Motor or Drive IC.

Replace lever Assembly Switch.

Does the Lever Assembly Switch work?

YES

NO

NO

Does the F/L Arm Assembly work normally?

YES

NO

Does the Door Opener work?

YES

Replace F/L Arm Assembly .

Replace the Door Opener.

2. Front Loading Mechanism

A.

B.

MECHANISM TROUBLESHOOTING GUIDE

4-27

Cassette will not load.

Does the CST insert?

Does the Opener Lid work?

Is the Door opener assembled correctly?

Replace the Lid Opener.

Replace the F/L Arm Assembly.

Check the power of L/D Motor.

Is the Cassette Holder Assembly

assembled correctly?

Replace the F/L Rear Rack.

Does the F/L Gear Rack work?

Does the Door Opener work?

Does the F/L Arm Assembly work?

Does the L/D Motor work?

Does the Cassette Holder Assembly

move the F/L Arm Assembly?

Replace the Front Loading

Mechanism Assembly.

YES

YES

YES

YES

NO

NO

NO

YES

NO

YES

NO

YES

NO

C.

4-28

EXPLODED VIEWS

117

103

105

117

100

106

107

A21

114

113

112

110

115

A24

116

102

A23

032

A22

109

054

054A

100A

100B

1. Front Loading Mechanism Section

EXPLODED VIEWS

4-29

401

402

001

008

011

031

079

017

032

024

406

020

021

028

019

018

029

030

026

A03

A04

A01

002

002A

025

027

022

003

004

006

007

010

405

014

015

009

409

013

023

016

405

012

402

OPTIONAL PART

2. Moving Mechanism Section (1)

EXPLODED VIEWS

4-30

051

052

517

061

056

058

518

052A

055

060

410

070

069

076

032

077

068

064

066

065

067

A11

078

A12

OPTIONAL PART

3. Moving Mechanism Section (2)