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ELECTRICAL ADJUSTMENT
(4) FM DEVIATION
v
CONNECTION METHOD
v
ADJUSTMENT PROCEDURE
1) Supply the Color Bar Signal to the VIDEO IN JACK, and set the VCR to the REC mode.
2) Connect the oscilloscope to TJ396 and trigger scope with a composite sync signal at TJ302.
3) Record the Color Bar Signal for a few minute and
playback it. Then confirm that the playback video
output level (TJ396) is 2.0
±
0.2Vp-p.
4) Adjust as follows if the playback video output level
is not 2.0
±
0.2Vp-p.
4-1) Adjust R392 a little.
4-2) Record the Color Bar Signal for a few minute
and playback it.
4-3) Confirm the playback video output level.
4-4) Repeat the procedure of 4-1) to 4-3) until
the playback video output level becomes 2.0
( 0.2Vp-p between sync tip and 100% white
level.
Adjustment Parts Check Point Measuring Equipment Test Tape Input Signal
R392 TJ396 Signal Gen. Oscilloscope Blank Tape Color Bar
2.0V 0.2Vp-p
TJ396
Horizontal :10 s/div
Vertical :0.5V/div
FM DEV
TJ396
TJ302
CH-1
Oscilloscope
CH-2
SIGNAL
GENERATOR
R392