Aiwa NSX-R50 Service Manual page 29

<Deck Section>
12. Tape Speed Adjustment (DECK 2)
Requirements
* Measuring instruments: Wow-flutter meter (frequency counter)
Test tape: TTA-100 (3 kHz)
Test point: HP OUT
Adjustment point: SFR1
(1) Connect the HP OUT terminal of the unit to the wow-flutter meter.
(2) Insert the test tape (TTA-100) to DECK 2. Playback the middle part of the tape in the
FWD direction, and adjust SFR1 so that the level, 3,000 Hz ± 5 Hz can be obtained.
(3) Playback in the RVS direction. Check that the range within ± 45 Hz is obtained against
the FWD speed.
13. Tape Speed Check (DECK 1)
Requirements: Same as Item 1
(1) Insert the test tape (TTA-100) to DECK 1. Playback the middle part of the tape, and
check that the range within ± 55 Hz is obtained against the speed of DECK 2.
14. Wow-Flutter Check (DECK 1, DECK 2)
Requirements: Same as Item 1.
(1) Connect the HP OUT terminal of the unit to the wow-flutter meter.
(2) Switch the wow-flutter setting from INDICATOR to JIS, and from a mode to W RMS
(WTD).
(3) Playback the middle part of the test tape (TTA-100), and check that the level is 0.21 %
or below.
15. Head Azimuth Adjustment (DECK 1, 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 CH1 of the oscilloscope probe to TP8 (Lch) and the CH2 to TP9 (Rch).
(2) Set the V mode of the oscilloscope to ADD.
(3) Insert the test tape (TTA-300) to DECK 1. Playback the middle part of the tape in the
FWD direction, and adjust the head azimuth adjustment screw so that the waveform
reaches maximum when 10 kHz is played.
(4) Turn the tape over, and playback in the RVS direction. Adjust the head azimuth
adjustment screw so that the waveform of oscilloscope becomes maximum.
(5) After adjustment, lock the screw by bonding (1600B).
(6) Apply the above steps 3 to 5 to DECK 2.
16. Playback Frequency Check (DECK 1, DECK 2)
Requirements
* Measuring instrument: Millivoltmeter
Test tape: TTA-300 (315 Hz / 10 kHz)
Test point: TP8 (Lch), TP9 (Rch)
(1) Connect the CH1 of millivoltmeter to TP8 (Lch) and the CH2 to TP9 (Rch).
(2) Insert the test tape (TTA-330) to DECK 1, and playback 315 Hz and 10 kHz.
(3) Check that the 10 kHz level is ranged within ± 3 dB compared to the output reference
level of 315 Hz.
(4) Apply the above steps 2 and 3 to DECK 2.
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WOW&FLUTTER METER
Hz %
INPUT
HP OUT
OSCILLOSCOPE
OUTPUT
CH1 CH2
TP8
TP9
AC MILLIVOLTMETER
CH1 CH2
TP8
TP9