Deck Adjustment; Tape Speed Adjustment; Head Azimuth Adjustment; Rec. Bias Frequency Adjustment - Aiwa XR-M101 Service Manual

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ELECTRICAL ADJUSTMENT (101LH 131U MODEL)

DECK ADJUSTMENT

1.TAPE SPEED ADJUSTMENT

Requirements
・Measuring equipments : wow-flutter meter (frequency counter )
Test Tape: TTA-100 (3KHz)
Test point: HP OUT
Adjustment point : Tape speed adjustment point (motor)
1) Connect HP OUT to the Wow - flutter meter.
2) Insert the test tape (TTA-100), play back center of the tape
and adjust the motor until it becomes 3,000Hz±30Hz.
2.WOW – FLUTTER CHECK
Requirements
Test tape: TTA-100 (3KHz)
Test point: HP OUT
1) Connect the HP OUT to the Wow – flutter meter.
2) Set the indicator to JIS and the mode to W RMS (WTD) of the Wow – flitter meter.
3) Play back thee center of the test tape (TTA-100) and check that it is below 0.35%.
TE
L 13942296513

3.HEAD AZIMUTH ADJUSTMENT

Requirements
・Measuring equipment: Oscilloscope
Test Tape: TTA-330 (8KHz)
Test point: HP OUT
Adjustment point: Head azimuth screw
1) Connect the HP OUT to the oscilloscope of CH1 and CH2.
2) Set the V mode of the oscilloscope to ADD.
3) Insert the test tape (TTA-330) , play back the center of the tape and adjustment
the head azimuth screw until the waveform of the oscilloscope has reached
the maximum when playing back at 10KHz.
4) After the adjustment, bond lock (1600B) the screw.

4.REC. BIAS FREQUENCY ADJUSTMENT

Requirement
・Measuring equipment: frequency counter
Test point: TP9
1) Connect the TP9 to the frequency counter.
2) Set the recording condition to the main unit.
3) Adjust the L301 until it becomes 85KHz±5KHz.
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8
HP OUT
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-23-
9 4 2 8
WOW&FLUTTER METER
Hz %
INPUT
WOW&FLUTTER METER
HP OUT
0 5 8 2 9 9 4 2 8
OSCILLOSCOPE
OUTPUT
CH1 CH2
Lch
Rch
FREQUENCY COUNTER
TP9
m
GND
9 9
Hz %
INPUT
9 9
Hz