Aiwa NSX-TR77 Service Manual page 39

ELECTRICAL ADJUSTMENT -5/7
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<DECK Section>
Make the following preparations for DECK section adjustment.
Preparations
Measuring Equipment: Audio Signal Generator / Attenuator / Wow and Flutter Meter (Frequency Counter) / Oscilloscope /
Test Tape:
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 middle part of the tape, and
adjust SFR1 so that the level 3,000 Hz
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
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.
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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 (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.
14. 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.
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3) Check that the level of 10 kHz is ranged within 0
315 Hz as a reference.
4) Apply the above steps 2) and 3) to DECK 2.
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Millivoltmeter / Dummy resistance (6Ω)
TTA-100 / TTA-300 (or TTA-310, 320) / TTA-200 / TTAA602(or equivalent recording and Playback
Test Tapes)
5 Hz is monitored.
55 Hz as compared to the speed monitored for
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3 dB compared to the output level of
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WOW&FLUTTER METER
Hz
INPUT
HP OUT
0 5 8 2 9 9 4 2 8
OSCILLOSCOPE
CH1 CH2
TP8
TP9
AC MILLIVOLTMETER
CH1
TP8
m
TP9
9 9
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9 9
OUTPUT
CH2