Aiwa NSX-R70 Service Manual page 43

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<DECK Section>
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10. Tape Speed Adjustment (DECK2)
Requirements
• Measuring instrument: Wow and flutter meter (frequency counter)
Test tape: TTA-100(3KHz)
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 middle part of the tape,
and adjust SFR1 so that the level 3,000Hz±5Hz 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 ±55Hz as compared to the speed monitored for DECK 2.
12. Wow and Flutter Check (DECK1 and DECK2)
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 0.15%.
13. Head Azimuth Adjustment (DECK1 and DECK2)
Requirements
• Measuring instrument: Oscilloscope
Test tape: TTA-300(10KHz)
Test point: TP8(Lch), TP9(Rch)
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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 DECK1. 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 10KHz is played.
4) After adjustment, secure the screw with glue (1600B).
5) Apply the above steps 3) and 4) to DECK2.
14. Playback Frequency Check (DECK1 and DECK2)
Requirements
• Measuring instrument: Millivoltmeter
Test tape: TTA-300(315Hz / 10KHz)
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 DECK1, and play back 315Hz and 10KHz.
3) Check that the level of 10KHz is ranged within ±3dB compared to the output level of 315Hz
as a reference.
4) Apply the above steps 2) and 3) to DECK2.
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