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SECTION 4 MECHANISM
CONTENTS
FRONT LOADING MECHANISM 31. Gear Pinch.............................................4-13
DISASSEMBLY 32. T/Up Arm Assembly...............................4-13
33. Gear Pinch Cam ....................................4-14
Front Loading Mechanism Assembly
Parts Location .....................................4-1 MECHANISM ADJUSTMENT
1. Front Loading Mechanism Disassembly..4-2
2. Guide Cassette........................................4-2 Tools and Fixtures for Deck ...................4-15
3. Bracket Assembly Side(R).......................4-2 1. Mechanism and Mode Switch Alignment
4. Bracket Assembly Side(L)/Top Plate .......4-2 Check ....................................................4-16
5. Holder Assembly Cassette ......................4-2 2. Preparation for adjustment
6. Arm Assembly F/L ...................................4-3 (To set VCR(VCP) to the Loading
7. Spring Stopper.........................................4-3 State without inserting a cassette).........4-17
8. Plate Reflector .........................................4-3 3. Tension post position and Tension
Adjustment.............................................4-17
DECK MECHANISM DISASSEMBLY 4. Checking Torque....................................4-18
5. Guide Roller Height Adjustment ............4-19
Deck mechanism Parts Location ....4-4 6. Audio/Control (A/C) Head Adjustment...4-20
1. Auto Head Cleaner Assembly .................4-5 7. X-Value Adjustment ...............................4-21
2. Drum and Base Assembly ........................4-5 8. Adjustment after Replacing Drum
3. Drum Sub Assembly................................4-5 Assembly (Video Heads) .......................4-22
4. A/C (Audio/Control) Head Assembly .......4-6 9. Check The Tape Travel after Reassembling
5. FE (Full Erase) Head Assembly ..............4-6 Deck Assembly................................................4-22
6. Plate Up/Supply Main Brake/Take up 9-1. Check Audio and RF Locking Time ...............
Main Brake/Body prism Led Assembly....4-7 during Playback after CUE or REV ........4-22
7. Tension Arm/Lever Assembly Tension.....4-7 9-2. Check the condition between the Audio
8. TAB Lever ................................................4-7 and Video Sync. (Lip Sync).....................4-23
9. Supply Reel/Take up Reel Assembly.......4-8 9-3. Check for tape curling or jamming..........4-23
10. Gear Pulley/Belt Capstan ........................4-8 10. Maintenance/Inspection Procedure................4-24
11. Gear H1, H2/Lever H1.............................4-8
12. Arm Assembly Idler .................................4-8 MECHANISM TROUBLESHOOTING
13. Mode S/W................................................4-9 GUIDE
14. Capstan Motor Assembly ........................4-9
15. Cam Bracket Assembly ...........................4-9 1. Deck Mechanism ...................................4-27
16. Cam Bracket/Lever Jog/Gear Jog ...........4-9 2. Front Loading Mechanism .....................4-31
17. Gear Cam L/D .......................................4-10 EXPLODED VIEWS
18. Gear P/S Plate Slider ............................4-10
19. Gear Assembly P2/P3 ...........................4-10 1. Moving Mechanism Section (1) .............4-34
20. Base Assembly P2/P3 ...........................4-10 2. Moving Mechanism Section (2) .............4-35
21. Guide Roller Assembly ..........................4-11 3. Front Loading Mechanism Section ........4-36
22. Clutch Assembly S27.............................4-11
23. Clutch Assembly T27 .............................4-11
24. Lever F/R & Arm F/R .............................4-11
25. Holder Pinch Assembly .........................4-12
26. Pinch Arm Assembly .............................4-12
27. L/D Motor Bracket Assembly .................4-12
28. Worm Wheel ..........................................4-12
29. L/D Motor Assembly & Worm
L/D Motor & L/D Motor Bracket .............4-13
30. Gear CNT ..............................................4-13
FRONT LOADING MECHANISM DISASSEMBLY
Front Loading Mechanism Assembly, Parts Location

5. Arm Assembly F/L
9. Plate Ground (L)
6. Plate Reflector
3. Top Plate

8. Plate Ground (R)

6. Plate
Reflector

4. Holder 2. Bracket Assembly
Assembly Side(R)
Cassette

1. Guide Cassette 7. Opener Door

* Component list below will be discribed as 3. Top Plate
if the top and bottom covers, front panel 4. Holder Assembly Cassette
and deck mechanism assembly have 5. Arm Assembly F/L
already been removed. 6. Plate Reflector
1. Guide Cassette 7. Opener Door
2. Bracket Assembly Side (R) 8. Plate Ground(R)
9. Plate Ground(L)

LG 4-1
FRONT LOADING MECHANISM DISASSEMBLY
1. Front Loading Mechanism Assembly 3. Bracket Assembly Side (R) (Fig. A-3)
(Fig. A-1) 1) Push the tabs(L), (R) of Bracket Assembly Side(R) to
1) Remove the Top and Bottom Covers and Front Panel. disengage with the Top Plate and remove it in the
2) Remove two screws(A). direction of arrow(A).
3) Lift up the Front Loading Mechanism Assembly in the
direction of arrow(B).

Top Plate
NOTE Plate Ground
When disassembling and reassembling: (A)
1) Give special attention to removal and to reassembly
because two tabs(L), (R) are engaged.
(A)
(R)

(A)
Bracket Assembly
(B) (L) Side(R)

Fig. A-3 Bracket Assembly Side(R)

4. Bracket Side(L)/Top Plate (Fig. A-4)
(L) 1) Remove the screw(B).
2) Remove the plate Ground(L), in the direction of
(R) arrow(A).
3) Push the locking tab(L1) and then remove the Bracket
Fig. A-1 Front Loading Mechanism
Side(L) in the direction of arrow(B).
4) The Top Plate can be removed by Separating the
Bracket Side(L).

2. Guide Cassette (Fig. A-2)
1) Push tab(R) of the Cassette Guide and disengage with
Bracket Side(R) and push tab(L) of the cassette Guide Plate Ground(L)
which is engaged with Bracket Side(L) and remove it in (B)
the direction of arrow (B). Hook(L)
(A) (B) Top Plate

(L) (C)
(L1)
Brackdt Side(L)

(B)

(B)
Cassette Guide
Fig. A-4 Bracket Side(L)/Top Plate

(R)

Fig. A-2 Guide Cassette

4-2 LG
FRONT LOADING MECHANISM DISASSEMBLY
5. Holder Assembly Cassette (Fig. A-5) 7. Spring Stopper (Fig. A-7)
1) Separate the Bracket Assembly Side(R). 1) Remove the Spring Stopper which is connected to the
2) Push the two lever tabs(L), (R) down and separate the tabs(A), (B) of the Lever Stopper(R) and the Bracket
Holder Assembly Cassette and the Arm Assembly F/L Holder(R).
from the Top Plate.

Lever Stopper(R)
Spring Stopper

(A)

(B)

Holder Bracket Holder(R)
Assembly Cassette
Fig. A-7 Spring Stopper
Fig. A-5 Holder Assembly Cassette

8. Plate Reflector (Fig. A-8)
1) Detach the Plate Reflector(L) from the Bracket Side(L)
6. Arm Assembly F/L (Fig. A-6) by using a knife.
1) Remove by pulling the Arm F/L(R) from the Bracket 2) Detach the Plate Reflector(R) from the Bracket
Holder(R) Boss in the direction of arrow(A). Assembly Side(R) by using a knife.
2) Separate the Arm Assembly F/L from Cassette Holder
Boss in the direction of arrow(B).

NOTE
When disassembling and reassembling:
Bracket
1) Be sure to remove the Arm F/L(R) first. If not the Arm Bracket Side(L) Assembly Side(R)
Assembly F/L can be damaged.
Plate Reflector
(L), (R)

(B)

Fig. A-8 Plate Reflector

(A)
Arm Assembly F/L

Fig. A-6 Arm Assembly F/L

LG 4-3
DECK MECHANISM DISASSEMBLY
Deck Mechanism Parts Location

TOP VIEW
A/C Head Assembly
Auto Head Cleaner Assembly

Bracket Assembly
Drum Brush L/D Motor

FE Head Holder
Drum Assembly Assembly Pinch
Arm Assembly T/up
Base Assembly
P2/P3 Gear Pinch Cam

Tension Arm Plate Up
Assembly
Supply Reel Take-up Reel
Assembly (S27) Assembly (T27)

TAB Lever

BOTTOM VIEW

Capstan Motor
Assembly

Mode Switch
Slider Plate
Bracket Cam
Gear Pulley
H1 Lever Clutch Assembly
S27
Gear H2/H1 Arm Assembly
Clutch Assembly Idler
T27

4-4 LG
DECK MECHANISM DISASSEMBLY
1. Auto Head Cleaner Assembly (Fig. B-1)
(Optional Item)
1) Push the tab(A) of Auto Head Cleaner and remove the Drum
Cleaner Arm Assembly. Assembly (A) Drum
Brush
NOTES:
When disassembling and reassembling:
1) Do not allow fingers or tools to touch the outside of the (A)
Drum.
2) Be careful not to get any foreign substance on the Drum 7(A)
Roller. Base

(B)

Cleaner Arm Assembly

(A)

Fig. B-2 Drum and Base Assembly

3. Drum Sub Assembly and Motor
Assembly (Fig. B-3-1)
1) Remove the Drum Base from the Deck Mechanism
Assembly.
Fig. B-1 Auto head cleaner Assembly
2) Separate the Drum Assembly from the Drum Base.
3) Remove two screws(A) and then remove the rotor.
4) Remove three screws(B) and then remove the stator.

2. Drum and Base Assembly (Fig. B-2) NOTE
1) Remove the Auto Head Cleaner Assembly. (option) When disassembling and reassembling:
2) Remove three screws(A) and separate the Drum 1) Do not touch the video tips with fingers or tools.
Assembly, Drum Base and the Drum Brush from the
Deck Mechanism Assembly.
3) Remove three screws(B) on the back side and remove
the Drum Assembly from the Drum Base.
Drum
NOTES: Sub Assembly
When disassembling and reassembling:
1) Do not touch the video tips with fingers or tools.
Give special attention to disassembling and
stator
reassembling of Auto Head Cleaner Assembly.
2) After assembling, adjust the tape transport system and Motor
Assembly
Servo PG.

(B) rotor

(A)

Fig. B-3-1 Drum Sub and Motor Assembly

LG 4-5
DECK MECHANISM DISASSEMBLY
4. A/C (Audio/Control) Head Assembly 5. FE (Full Erase) Head Assembly (Fig. B-5)
(Fig. B-4) (Optional Item)
1) Push two tabs(A) and remove the FE Head.
1) Unplug the A/C connector from the Loading Motor
P.C.B. NOTE
2) Remove two screws(A) and remove the A/C Head
Assembly from the Deck Mechanism Assembly. When disassembling and reassembling:
1) Be careful not to get any foreign substance on the FE
NOTES: Head.

When disassembling and reassembling:
1) When assembling, the 3mm hole of the Base A/C
should coincide to 3mm hole in the Chassis.
2) Do not touch the A/C Head Tips with fingers or tools.
3) After reinstalling the Audio Control Head Assembly,
adjust the Tilt, Azimuth and Height of A/C Head.

(A)

(A)

Fig. B-5 FE Head Assembly

Fig. B-4 A/C Head Assembly

4-6 LG
DECK MECHANISM DISASSEMBLY
6. Plate Up/Supply Main Brake/Take up Main NOTES:
Brake/Body Prism Led Assembly (Fig. B-6) When disassembling and reassembling:
1) Plate Up 1) (D) is engaged to the cam groove of the Gear Cam L/D