Test Method - JVC KS-AX4500 Service Manual

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Test method

1. Check the voltage and frequency of the secondary
toroidal coil.
FREQUENCY:22.87kHz ± 50Hz
.
VOLTAGE VALUE:60Vp-p ± 2.5V
2. Measure the secondary toroidal coil, if the standard
frequency value of 22.87 kHz ± 50 Hz is not attained,
measure the R60 terminal, then adjust the SV01 so
that the R60 terminal becomes 22.87 kHz ± 50Hz.
TE
Note: When measuring, adjust and apply power
L 13942296513
with no signal or load on each board.
DC/DC CONVERTER SECOND GENERATOR SWITCHING
TEST ITEM
VOLTAGE TEST
FREQUENCY CHECK
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SPECIFICATION CONDITION
60Vp-p±2.5V OSCILLOSCOPE
VOLT/DIV: 10
TIME/DIV: 10mcec
22.87KHz±50Hz
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2 9
8
FREQUENCY COUNTER
TEST SET
MAIN PCB
MAIN PCB
Q Q
3 6 7 1 3 1 5
co
.
9 4 2 8
POWER SUPPLY
14.4V
(+)
(-)
R60
Measuring
Q01
Points
C01
C31
R03
0 5 8 2 9 9 4 2 8
60Vp-p
±2.5V
m
KS-AX4500
9 9
9 9
1-7