Aiwa NSX-R41 Service Manual page 37

ELECTRICAL ADJUSTMENT -5/7
<DECK Section>
12. Tape Speed Adjustment (DECK 2)
Requirements
• Measuring instrument: Wow and flutter meter (frequency counter)
Test tape: TTA-100 (3 kHz)
Test point: HP OUT
Adjustment point: DECK MOTOR SFR
1) Connect the wow and flutter meter to HP OUT of the unit.
2) Insert the test tape (TTA-100) to DECK 2. Play back the middle part of the tape,
and adjust DECK MOTOR SFR so that the level 3,000 Hz ± 55 Hz is monitored.
13. Tape Speed Check (DECK 1)
Requirements: Same as the above, 12.
1) Insert the test tape (TTA-100) to DECK 1. Play back the middle part of the tape, and check that
the level is ranged within ± 55 Hz as compared to the speed monitored for DECK 2.
14. Wow and Flutter Check (DECK 1 and DECK 2)
Requirements: Same as the above, 12.
1) Connect the wow and flutter meter to HP OUT of the unit.
2) Set the wow and flutter to JIS for INDICATOR and to WRMS (WTD) for mode.
3) Play back the middle part of the test tape (TTA-100), and check that the level ranges under 0.25%.
15. Head Azimuth Adjustment (DECK 1 and DECK 2)
Requirements
• Measuring instrument: Oscilloscope
Test tape: TTA-300 (10 kHz)
Test point: TP8 (Lch), TP9 (Rch)
Adjustment point: Head azimuth adjustment screw
1) Connect the probe CH1 of the oscilloscope to TP8 (Lch) and CH2 to TP9 (Rch).
2) Set V mode of the oscilloscope to ADD.
3) Insert the test tape (TTA-300) to DECK 1. Forward and play back the middle part of the tape,
and adjust the head azimuth adjustment screw so that the waveform achieves its maximum level
when 10 kHz is played.
4) After adjustment, secure the screw with glue (1600 B).
5) Apply the above steps 3) and 4) to DECK 2.
16. Playback Frequency Check (DECK 1 and DECK 2)
Requirements
• Measuring instrument: Millivoltmeter
Test tape: TTA-300 (315 Hz / 10 kHz)
Test point: TP8 (Lch), TP9 (Rch)
1) Connect CH1 of the millivoltmeter to TP8 (Lch) and CH2 to TP9 (Rch).
2) Insert the test tape (TTA-300) to DECK 1, and play back 315 Hz and 10 kHz.
3) Check that the level of 10 kHz is ranged within ± 3 dB compared to the output level of 315 Hz
as a reference.
4) Apply the above steps 2) and 3) to DECK 2.
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