Aiwa XR-EM30 Service Manual page 43

ELECTRICAL ADJUSTMENT -7/8
CD CHECK
CD PWB PART SIDE
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
1. Focus Offset Adjustment
1) Connect a digital multimeter to the FE and Vref.
2) Playback the second track of the TCD-782.
3) Adjust SFR501 until the digital multimeter indicates 20±5mV.
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.
Vref
FE
SFR501
PATTERN SIDE
Vref
RF
TE
FE
-43-
1 2
2 3
4
1
OSCILLOSCOPE
OUTPUT
RF
Vref
3 4