Aiwa Z-A65 Service Manual page 42

<DECK SECTION>
10. 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: SFR1
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 FWD to middle part of the tape,
and adjust SFR1 so that the level 3,000 Hz ± 5 Hz is monitored.
11. Tape Speed Check (DECK 1)
Requirements: Same as the above, 10.
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.
12. Wow and Flutter Check (DECK 1 and DECK 2)
Requirements: Same as the above, 10.
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 W RMS (WTD) for mode.
3) Play back the middle part of the test tape (TTA-100), and check that the level ranges under 0.25 %.
13. Head Azimuth Adjustment (DECK 1 and DECK 2)
Requirements
• Measuring instrument: Oscilloscope
Test tape: TTA-300 (8 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. Play back the middle part of the tape,
and adjust the head azimuth adjustment screw so that the waveform achieves its maximum level
when 8 kHz is played.
4) After adjustment, secure the screw with glue (1600 B).
5) Apply the above steps 3) and 4) to DECK 2.
14. Playback Frequency Check (DECK 1 and DECK 2)
Requirements
• Measuring instrument: Millivoltmeter
Test tape: TTA-300 (315 Hz / 8 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 8 kHz.
3) Check that the level of 8 kHz is ranged within 0 ± 5 dB compared to the output level of 315 Hz
as a reference.
4) Apply the above steps 2) and 3) to DECK 2.
15. Playback Sensitivity Check (DECK 1 and DECK 2)
Requirements
• Measuring instrument: Millivoltmeter
Test tape: TTA-200 (400 Hz)
Test points: TP8 (Lch), TP9 (Rch)
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