Vhs Frequency Response Adjustment - Panasonic NV-MV20EG Service Manual

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3.3.5 VHS FREQUENCY RESPONSE
ADJUSTMENT
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Insert the VHS Blank Tape.
Input the Video sweep signal (See Fig. E1) to AV1 (VIDEO IN) and record it in SP and LP.
Press the FF and EJECT Keys
simultaneously for 3 seconds.
Press the FF and EJECT Keys
simultaneously twice.
Press the EJECT key for 3 seconds.
Press the CH UP and/or CH DOWN key until "11" is displayed on FIP.
Insert the Self-recorded tape and playback it. (SP/LP mode)
*NV-MV20EG,MV15EG do not have LP/EP modes.
Connect the Oscilloscope to:
*CH1....Video Out (TW3002).
*CH2....V.FREQ.(TW6002)
Press the "4" key on the remote controller.
(Confirm that TW6002 becomes high(2.5V)).
Adjust the Frequency response by pressing the "2"(increase) and/or "8"(decrease) key on the Remote Controller. (See Fig.E2)
Store the Adjusted value by pressing the "5" key on the Remote Controller.
Release the Service mode by pressing the EJECT and FF keys simultaneously in 6 times until the FIP becomes normal indication.
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PROCEDURES
Fig. E4
FIP DISPLAY