VC-MH80
VC-MH90
5. ELECTRICAL ADJUSTMENT
Notes:
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Before the adjustment:
Electrical adjustments discussed here are often required after replacement of electronic components and
mechanical parts such as video heads.
Check that the mechanism and all electric components are in good working condition
prior
to
the
adjustments, otherwise adjustments can not be completed.
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Instruments required:
@Colour TV monitor
@Audio signal generator
@DC
voltmeter
@Blank video cassette tape
@Screwdriver for adjustment
@Colour bar signal generator
@Frequency counter
@Dual-trace oscilloscope
@AC
milli-voltmeter
@Alignment
tape.(VROCPSV)
@Alignment tape (VROATSV)
@Alignment tape (VROCBFFS)
@Alignment tape (VROCPZJS)
X
Servicing precautions
When the
IC703
(E*PROM)
has been replaced, make the following reprogramming. Depending on models,
the
IC703
(E*PROM)
has been
factry-adjusted
for it’s memory function.
It’s therefore necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the head switching point, slow and still modes.
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Location of controls and test points
Figure
5-1.
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