Tape Path Adjustment - Sony DCR-TRV725E Service Manual

5-4. Tape Path Adjustment

Purpose:
Adjust the linearity of the head.
If the adjustment is not correct:
Noise appears on the top and bottom of the screen
when playing back the tape that is recorded by other
recorders.
5-4-1. Adjustment Preparation
1) Clean the tape running surface (tape guides, drum, capstan shaft,
pinch roller).
2) Connect the adjustment remote commander to the remote
terminal.
3) Set the adjustment remote commander to the PATH mode (track
shift mode)* and release the auto tracking.
4) Connect an oscilloscope as follows:
CH1: Test connector' PB RF terminal
External trigger: Test connector' RF SWP terminal
5) Playback the tracking alignment tape WR5-1NP (NTSC), WR5-
1CP (PAL) (Ref. No. J-6).
6) Confirm that the RF waveform on scope is flat both at entrance
side and exit side.
If the RF waveform is not flat, perform the adjustment by
referring to section 4-2.)
7) After the adjustment is completed, release the PATH mode
(track shift mode)*.
TG1
S reel
* Setting and releasing the track shift mode
In case of the DCR-TRV230
Setting
1. Select page: 0, address: 01 and set data: 01.
2. Select page: F, address: 22 and set data: 88, and press the PAUSE
button.
3. Select page: 2, address: 2E and set data: 02. (Note)
TG3 TG4
TG2
Entrance side
TG5 TG6
Drum
Fig. 5-5.
Releasing
1. Select page: 0, address: 01 and set data: 01.
2. Select page: F, address: 22 and set data: 80, and press the PAUSE
button.
3. Select page: 2, address: 2E and set data: 00.
4. Select page: 0, address: 01 and set data: 00. (Note)
Note: In case of the Digital8 only, set the data of page: 2, address: 2E.
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Exit side
Normal
Entrance side is defective
Exit side is defective
Fig. 5-4.
Capstan shaft
TG7
Pinch roller
T reel