7.2.2.2. MR HEAD GAP ADJUSTMENT
Purpose:
To properly pick up the FG Signal.
Symptom of
Misadjustment:
If the FG Signal is not properly picked up,
Servo Operation cannot be achieved.
Equipment
Required:
Oscilloscope
Specification:
0.1 mm ~ 0.13 mm
1. Remove the VCR Chassis Unit and then place it upside
down.
2. Remove the TV/VCR Main C.B.A.
3. Slightly loosen Screw (A). Then set the Screwdriver (Phillips
Driver) into the Hole (A). Turn the screwdriver clockwise
until the MR Head touches the rotor. Then turn it slightly
counterclockwise to make the clearance as specified.
4. Tighten Screw (A).
5. Reinstall the TV/VCR Main C.B.A.
Fig. M3-1
Note:
Do not touch the outside circumference of the rotor surface
with any tool and keep magnetic material away from the
rotor magnet (especially metal particles).
Confirmation of Signal Level
1. Place the unit in Service Position (2). Refer to "SERVICE
POSITION" in SERVICE NOTES.
2. Supply a Video Signal to the video input jack.
3. Insert a cassette tape and place the unit in SLP recording
mode.
4. Connect the oscilloscope to Pin 9 of P6201 on the TV/VCR
Main C.B.A. Confirm that the signal level is greater than 20
mV [P-P].
Fig. M3-2
42
PVQ-1310 / PV-C1320 / PV-C1330W / VV-1300 / VV-1310W / PV-C1340 / PV-C1350W / PV-C2010 / PV-C2020 / PV-C2030W / VV-2000 / PV-C2060