Aiwa XR-EM30 Service Manual page 38

ELECTRICAL ADJUSTMENT -2/8
DECK ADJUSTMENT
MAIN PWB PART SIDE
L451
J231
1. Tape Speed Adjustment
Requirements
Measuring equipments : wow-flutter meter (frequency counter )
Test Tape: TTA-100 (3KHz)
Test point: C651(Lch),C652(Rch),GND
Adjustment point : Tape speed adjustment point (motor)
1) Connect Test point 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 +3 / -2%.
2. Wow – Flutter Check
Requirements
Test tape: TTA-100 (3KHz)
Test point: C651(Lch),C652(Rch),GND
1) Connect the Test point 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 0.25%.
C651 C652
1 2 3
DECK MECHANISM
2
-38-
HEAD
3
MOTOR
WOW&FLUTTER METER
Hz %
INPUT
TP
WOW&FLUTTER METER
Hz %
INPUT
TP
1