Aiwa NSX-SZ900 Service Manual page 37

3. Checking WOW & FLUTTER (DECK 1, DECK 2)
Requirements
Same as number 1
1) Connect the WOW & FLUTTER Meter to the HP OUT.
2) Set the indicator to JIS and the mode to W RMS (WTD) of the WOW & FLUTTER.
3) Playback the centre of the test tape (TTA-100) and check that it is below 0.21 %.
4. Checking Adjusting Head Azimuth (DECK 1, DECK 2)
Requirements
• Measuring Device: Oscilloscope
Test Tape: TTA-300 (10 kHz)
Test Point: TP8 (Lch), TP9 (Rch)
Adjustment Point: Head Azimuth Screws
1) Connect the CH1 probe of the oscilloscope to TP8 (Lch) and the CH2 probe of the oscilloscope to TP9 (Rch).
2) Set the V mode of the oscilloscope to ADD.
3) Insert the test tape (TTA-300) into DECK 1, FWD playback the centre of the tape and adjust, using the
head azimuth screws until the waveform of the oscilloscope has reached the maximum when playing
back at 10 kHz.
4) Reverse the tape, RVS playback and adjust, using the head azimuth screws until the waveform of the
oscilloscope has reached its maximum.
5) After the adjustment, bond lock (1600 B) the screws.
6) Perform the same operation from 3) to 5) for DECK 2.
5. Checking Playback Frequency (DECK 1, DECK 2)
Requirements
• Measuring Device: Millivoltmeter
Test Tape: TTA-330 (315 Hz/8 kHz)
Test Point: TP8 (Lch), TP9 (Rch)
1) Connect CH1 of the millivoltmeter to TP8 (Lch) and CH2 of the millivoltmeter to TP9 (Rch).
2) Insert the test tape (TTA-300) into DECK 1 and playback at 315 Hz and 10 kHz.
3) Use the 315 Hz output level as a standard, check that the 8 kHz level is within ± 3 dB.
4) Perform the same operation from 3) to 5) for DECK 2.
6. Checking Playback Sensitivity (DECK 1, DECK 2)
Requirements
• Measuring Device: Millivoltmeter
Test Tape: TTA-200 (400 Hz)
Test Point: TP8 (Lch), TP9 (Rch)
1) Connect CH1 of the millivoltmeter to TP8 (Lch) and CH2 of the
millivoltmeter to TP9 (Rch).
2) Insert the tape (TTA-200) into DECK 1 and playback.
3) Check that the output level is within 300 mV ± 30 mV.
4) Perform the same operation from 2) to 3) for DECK 2.
7. Adjusting REC / PB Frequency Response (DECK 2)
Requirements
• Measuring Devices: Millivoltmeter, Audio Signal Generator
(Low Frequency Generator) Attenuator
Test Tape: TTA-602 (NORMAL)
Test Point: TP8 (Lch) , TP9 (Rch)
Input Point: AUX (1 kHz/10 kHz)
Adjustment Point: SFR351 (Lch), SFR352 (Rch)
1) Connect CH1 of the millivoltmeter to TP8 (Lch) and
CH2 of the millivoltmeter to TP9 (Rch).
AUDIO SIGNAL
GENERATOR
ATTENUATOR
OUTPUT INPUT
(1kHz, 1V)
– 37 –
CH1
TP8
TP9
SET
AUX(L) TP8
OUTPUT
TP9
AUX(R)
OSCILLOSCOPE
OUTPUT
CH2
AC MILLIVOLTMETER
CH1 CH2
TP8
TP9
AC MILLIVOLTMETER
CH1 CH2