Aiwa XR-EC10 Service Manual page 58

ELECTRICAL ADJUSTMENT -4/5
QQ
3 7 63 1515 0
CLOCK ADJUSTMENT AND CD CHECK
MAIN PWB PATTERN SIDE
GND
1. Clock Adjustment
Requirements
Test point: CLOCK, GND
Adjustment point: L401
1) While pressing and holding down the POWER button and the TUNER / BAND button, insert the
AC plug to outlet.
2) Adjust L401 so that the oscilloscope indicates the frequency within 347.661Hz–348.357Hz.
CD CHECK
Perform the adjustments after the main unit enters the test mode.
TE
L 13942296513
Place the CD mechanism on level ground.
Equipment and tools required
Measuring equipment
Digital multi-meter
Jitter meter (KIKUSUI 6235)
Test disc: TCD-782
ATD-001
2. RF Waveform Check
1) Connect oscilloscope to the test point RF and Vref.
2) Play back the 2 nd track of TCD-782.
3) Check that the RF waveform has the maximum amplitude and the center
of the wedge waveform has the clear blank.
EYE PATTERN
must be CLEAR and MAX
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CLOCK
L401
IC301
IC401
Q301
R315
Approx.
1.8
VOLT / DIV: 500mV
TIME / DIV: 0.2 s
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y
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8
1
2
TE
FE
5
Vref 2 3
2 3
RF
6
Q Q
3 6 7 1 3
0.3Vp.p
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-58-
2 9 9 4 2 8
4
1 5 0 5 8 2 9 9 4
OSCILLOSCOPE
OUTPUT
RF
Vref
m
co
9 9
2 8 9 9