Aiwa XR-EM60 Service Manual page 46

CLOCK ADJUSTMENT AND CD CHECK
MAIN C. B (PATTERN SIDE)
1. CLOCK ADJUSTMENT
Requirement
Test point: CLK, 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.
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.
nd
2) Play back the 2
3) Check that the RF waveform has the maximum amplitude and the center
of the wedge waveform has the clear blank.
GND
CLK
L401
IC401
track of TCD-782.
EYE PATTERN
must be CLEAR and MAX
TE
IC301
FE
Q301
VREF
R315
RF
Approx.
1.8 ±0.3Vp.p
VOLT / DIV: 500mV
TIME / DIV: 0.2µs
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OSCILLOSCOPE
OUTPUT
RF
VREF