Aiwa NSX-TR77 Specifications download pdf (Page 39)

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ELECTRICAL ADJUSTMENT -5/7

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 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 (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.

3) Check that the level of 10 kHz is ranged within 0 3 dB compared to the output level of

315 Hz as a reference.

4) Apply the above steps 2) and 3) to DECK 2.

AC MILLIVOLTMETER

OSCILLOSCOPE

WOW&FLUTTER METER

OUTPUT

INPUT

%Hz

CH2CH1

TP8

TP9

HP OUT

TP8

TP9

CH2CH1

Make the following preparations for DECK section adjustment.

Preparations

Measuring Equipment: Audio Signal Generator / Attenuator / Wow and Flutter Meter (Frequency Counter) / Oscilloscope /

Millivoltmeter / Dummy resistance (6Ω)

Test Tape: TTA-100 / TTA-300 (or TTA-310, 320) / TTA-200 / TTAA602(or equivalent recording and Playback

Test Tapes)

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Aiwa NSX-TR77 Specifications Page 39

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