Aiwa XR-EM20 Service Manual page 40

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3.HEAD AZIMUTH ADJUSTMENT
Requirements
Measuring equipment: Oscilloscope
Test Tape: TTA-330 (8KHz)
Test point: C651(Lch),C652(Rch),GND
Adjustment point: Head azimuth screw
1) Connect the Test point 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 8KHz.
4) After the adjustment, bond lock (1600B) the screw.
4.REC BIAS FREQUENCY ADJUSTMENT
Requirement
Measuring equipment: frequency counter
Test point: JW38, GND
Adjustment point: L451
1) Connect the JW38 to the frequency counter.
2) Set the recording condition to the main unit.
3) Adjust the L451 until it becomes 85KHz+/-0.5KHz.
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FREQUENCY COUNTER
TP
GND
Q Q
3 6 7 1 3 1 5
co
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9 4 2 8
OSCILLOSCOPE
OUTPUT
CH1 CH2
Lch
Rch
Hz
0 5 8 2 9 9 4 2 8
m
9 9
9 9