Sony CA-WR855, Service Manual

Page: 194 / 298

4-20 DSR-300/P(E)/V1
TR arm assembly
Spring
Stopper washer
Cap holder
Polyethylene
slider
(t0.25 ø1.6)
Clank arm
Shaft
Mode gear
Bearing
Pin C
Polyethylene slider
(t0.25 ø1.6)
Screw
Counter weight assembly
Cam groove
Flat surface
a
b
Removal
1. Remove the SV-164 board. (Refer to Section 2-
11-8.)
2. Remove the one screw shown in the figure, and
remove the counter weight assembly.
3. Remove the sensor attachment plate assembly.
(Refer to Section 4-15.)
4. Remove the TR band assembly.
(Refer to Section 4-12.)
5. Remove the stopper washer of the TR arm
assembly, and remove the cap holder.
6. Remove the TR arm assembly.
Note: When removing the TR arm
assembly, be sure to hold parts
a a a a a
and
b b
b b b
horizontally, and the pull the
TR arm assembly upwards vertically.
Not pulling them horizontally may
cause the following defects.
1) Deformation of the crank arm and shaft of the
TR arm assembly.
2) Scratches on the inside of the bearing of the
shaft, and a replacement TR arm assembly
can not be attached.
Attachment
7. Insert Pin C of the TR arm assembly into the cam
groove of the mode gear in the reverse order of
steps 1 to 6, and insert the shaft into the bearing.
Note: When attaching the counter weight
assembly to the shaft of the TR arm
assembly, take note of the following.
1) Tighten the attaching screw at the flat part of
the shaft of the TR arm assembly.
2) Attach so that there is a clearance of 0.1 to
0.2 mm from the sleeve (TR).
8. Attach the SV-164 board.
(Refer to Section 2-11-8.)
Check/Adjustment
9. Perform TG-2 tape guide height check/
adjustment. (Refer to Section 4-37.)
10. Perform the reel table FWD/REV rewinding
torque check/adjustment. (Refer to Section 4-38.)
11. Perform the TR arm assembly position check/
adjustment. (Refer to Section 4-40.)
12. Perform FWD back tension check/adjustment.
(Refer to Section 4-39.)
13. Perform tape path check. (Refer to Section 5-3.)
14. Perform tracking adjustment.
(Refer to Sections 5-4 to 5-7.)
Counter weight assembly
Sleeve (TR)
Mechanism chassis
0.1 to 0.2 mm