Sony DSR-20MD, Service Manual

Page: 121 / 225

5-29
5-25. MAIN CAM, TG2 SL ARM ASSEMBLY AND TENSION COIL SPRING (TG2 SL)
The two grooves on one side of the main cam drive the TG2 selection arm and the TG2 load arm assembly.
Since it is difficult to attach the main cam, fix the TG2 selection arm and the TG2 load arm assembly with the main cam’s phase adjusted
correctly (Nearly unloading position (See 3-1. Phase Adjustment
A : page 5-6)), so that later mounting work can be performed smoothly.
If fixed parts are shifted, follow “3-3. Phase Adjustment
T
,
U
: page 5-11”.
1. Removing
1 . Set the
UNLOADING
position. (Refer to page 5-3)
2
. LM motor block assembly and LM worm wheel.
5
PH-G
LM worm wheel
1
Flexible board
4
LM motor block
assembly
2
Connector 2P
3
Two screws (TTP2
×
4.5)
• Removing:
1
→
2
→
3
→
4
→
5
• Attaching :
5
→
4
→
3
→
2
→
1
Fixing torque: 0.1961 N•m (2.0 kg•cm)
3
. GL arm retainer and GL arm. (Refer to 5-22)
4
. M slider and M slider arm. (Refer to 5-23)
5
. TG2 spring hook.
Claw
TG2 spring hook
Fix it with adhesive tape.
PH-T TG2 selection arm
PH-U TG2 load arm assembly
MECHANISM DECK
(Front side)
6
. Main cam, TG2 SL arm assembly and tension coil spring (TG2
SL).
PH-A, T, U Main cam
TG2 SL arm assembly
Tension coil spring
(TG2 SL)
2. Attaching
1 . Attach the parts in the order of 1
→
6
→
5
→
4
→
3
→
2
.
2 . Adjust them according to the flowchart (START-2) on page
5-43.
Cam groove on the main cam.
Main cam (rear side)
Apply the grease (12 mm dia.) to each
two of cam groove ( part).
PH-A : Page 5-6
PH-G : Page 5-7
PH-T , PH-U : Page 5-11