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Prior to the adjustment:
In most cases, necessity for electrical circuits will
arise from replacement of mechanical parts
including the video head.
a d j u s t m e n t o f e l e c t r i c a l c i r c u i t s , c h e c k t h a t
m e c h a n i c a l o p e r a t i o n o f t h e e q u i p m e n t i s
complete (the mechanism are adjusted completely).
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VTVM
l
DC regulated power supply
ADJUSTMENT OF POWER CIRCUIT
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Test points layout
n
ADJUSTMENT OF POWER CIRCUIT
Adjustment of power circuit
Measuring
DC voltmeter
instrument
Mode
E-E
Test point
C921 $ LEAD
Control
R917
Specification
( 1 ) C o n n e c t a v o l t m e t e r t o C921$ (pin 4 of
connector PA) and ground.
(2) Adjust R917 so that the voltmeter reads 8.5V.
ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY
Before starting
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Oscilloscope
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Audio generator
If the equipment fails electrically, locate a defect or
defects first of all using instruments. Then repair or
r e p l a c e p a r t s a n d m a k e a d j u s t m e n t b y t h e
procedures described below.
When required instruments are not available, do
not move controls indiscriminately.
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Colour bar generator
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Alignment tape
Figure 2-O.
Adjustment of power circuit (9V)
Measuring
instrument
Mode
Test point
Control
Specification
( 1 ) C o n n e c t a v o l t m e t e r t o C919@ (pin 1 of
connector PA) and ground.
(2) Adjust R921 so that the voltmeter reads 9.4V.
34
l
Frequency counter
DC voltmeter
I
I C919@ LEAD
R921
0.1
I
I
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