Aiwa XR-EM20 Service Manual page 46

ADJUSTMENT (FRONT/DECK/TUNER/CD) - 7/8
<CD SECTION>
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.
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.
Vref
FE
SFR501
track of TCD-782.
PATTERN SIDE
Vref
RF
TE
FE
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!@#$
@#
$
!
OSCILLOSCOPE
OUTPUT
RF
Vref