Adjustment Method - JVC KS-AX6700 Service Manual

KS-AX6700

Adjustment method

1. Check the voltage and frequency of the secondary
toroidal coil.
FREQUENCY:24.35kHz ±10Hz
.
VOLTAGE VALUE:55Vp-p
2. Measure the secondary toroidal coil, if the standard
frequency value of 24.35 kHz ± 10 Hz is not attained,
measure the R760 terminal, then adjust the VR701
so that the R760 terminal becomes 24.25 kHz ± 10Hz.
Note: When measuring, adjust and apply power
with no signal or load on each board.
DC/DC CONVERTER SECOND GENERATOR SWITCHING
TEST ITEM SPECIFICATION
VOLTAGE TEST 88Vp-p±2.5V
FREQUENCY CHECK 24.350KHz±10Hz
1-8
FREQUENCY COUNTER
TEST SET
CONDITION
OSCILLOSCOPE
VOLT/DIV: 10
TIME/DIV: 10mcec
VARIABLE: MINIMUM
(+)
(-)
MAIN PCB
POWER SUPPLY
14.4V
Measuring
Points
88Vp-p
±2.5V