Sony DCR-PC350 Service Manual page 210

DV MECHANICAL ADJUSTMENT MANUAL VII
4-2. TG3/TG5 Guide Coarse Adjustment
1) Play back the tracking alignment tape (XH 2-1) (Ref. No. J-5).
2) Adjust the TG3 and TG5 guides until the RF envelope waveform
becomes flat. (Refer to Fig. 4-8.)
Pinch roller
TG7 guide
TG6 guide
TG5 guide
TG4 guide
TG3 guide
4-3. FWD Back Tension Adjustment
1) Set the mini DV torque cassette (Ref. No. J-6) and establish
the FWD mode.
2) Confirm that the S side torque cassette reading value is in the
range of 0.2 to 0.3 mN•m (2.0 to 3.0 g•cm) including deviation.
If the measurement value does not satisfy the specifications,
perform the following adjustment.
• If the measurement value is higher than the specification:
(Decreases the spring tension)
Move the tension coil spring hook to another spring stay in
the direction of B.
• If the measurement value is lower than the specification:
(Increases the spring tension)
Move the tension coil spring hook to another spring stay in
the direction of A.
Tension coil spring (tension regulator)
A
B
LS chassis assy
Drum
TG3 guide,
TG5 guide
Adjustment nut
TG1 guide
TG2 guide
Fig. 4-6
TG2 arm
assy
Fig. 4-7
4-4. TG3/TG5 Guide Fine Adjustment
1) Play back the tracking alignment tape (XH 2-1) (Ref. No. J-5).
2) Adjust the TG3 so that the RF envelope has the larger amplitude
at the entrance side first, than adjust TG3 guide for flat
amplitude. (Refer to Fig. 4-8.)
3) Adjust the TG5 so that the RF envelope has the larger amplitude
at the exit side first, than adjust TG5 guide for flat amplitude.
(Refer to Fig. 4-9.)
Entrance side
Entrance side
— 50 —
Exit side
Fig. 4-8
Exit side
Fig. 4-9