Cd Adjustment; Focus Bias Adjustment; Rf Waveform Check - Aiwa XR-M101 Service Manual

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CD ADJUSTMENT

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CD PWB
PATTERN SIDE
FE
Vref
・Perform the adjustments after the main unit enters the test mode.
・ Place the CD mechanism on level ground.
・Equipment and tools required
Measuring equipment
TE
L 13942296513
Digital multi-meter
Jitter meter (KIKUSUI 6235)
Test disc: TCD-782
ATD-001
1.FOCUS BAIS ADJUSTMENT
1) Connect the digital multi-meter to the test point FE and Vref.
nd
2) Play back the 2 track of TCD-782.
3) Adjust SFR430 until the digital multi-meter indicates 0±10mV.

2.RF WAVEFORM CHECK

1) Connect oscilloscope to the test point RF SW and Vref.
nd
2) Play back the 2 track of TCD-782.
3) Check that the RF waveform has the maxmum amplitude and the center of the wedge
waveform has the clear blank.
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R401
R402
IC401
RF SW
IC402
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2 9
8
PARTS SIDE
Q Q
3 6 7 1 3 1 5
co
.
-31-
9 4 2 8
1
SFR430
IC403
5
2 3
1
1 2 3
0 5 8 2 9 9 4 2 8
DIGITAL MULTIMETER
V
FE
Vref
OSCILLOSCOPE
OUTPUT
RF SW
Vref
m
EYE PATTERN
must be CLEAR and MAX
VOLT / DIV: 500mV
TIME / DIV: 0.2µs
9 9
9 9
Approx.
1.8 ±0.3Vp.p