Aiwa XR-FD55 Service Manual page 43

ELECTRICAL ADJUSTMENT -3/5
5. Playback Sensitivity Check
Requirements
* Measuring instrument: Millivoltmeter
Test tape: TTA-200 (400 Hz)
Test point: TP8 (Rch), TP9 (Lch)
(1) Connect the CH1 of millivoltmeter to TP9 (Lch) and the CH2 to TP8 (Rch).
(2) Insert the test tape (TTA-200) to DECK to playback.
(3) Check that the output level is ranged within 145 mV ± 3 dB.
6. Playback/Record Frequency Response Adjustment
Requirements
* Measuring instruments: Millivoltmeter
Audio signal oscillator (low-frequency oscillator)
Attenuator
Test tape: TTA-602 (LH)
Test point: TP8 (Rch), TP9 (Lch)
Input point: AUX (1 kHz / 8 kHz)
Adjustment point: SFR451 (Lch), SFR452 (Rch)
(1) Connect the CH1 of millivoltmeter to TP9 (Lch) and the CH2 to TP8 (Rch).
(2) Connect the output terminal of oscillator to attenuator, and then attenuator to AUX of the unit.
(3) Insert the test tape (TTA-602) to DECK, and record the 1 kHz signal from AUX.
(4) Adjust the attenuator so that the output levels of TP8 and TP9 become 17 mV.
(5) Record 1 kHz and 8 kHz alternately.
(6) Adjust SFR451 (Lch) and SFR452 (Rch) so that the playback output level of 8 kHz is ranged within 0 ± 1 dB compared to the
playback output reference level of 1 kHz.
7. Playback/Record Sensitivity Check
Requirements
* Measuring instruments: Millivoltmeter
Audio signal oscillator (low-frequency oscillator)
Attenuator
Test tape: TTA-602 (LH)
Test point: TP8 (Rch), TP9 (Lch)
Input point: AUX (8 kHz)
(1) Insert the test tape (TTA-602) to DECK, and record the 8 kHz signal from AUX.
(2) Adjust the attenuator so that the output levels of TP8 and TP9 become 170 mV.
(3) Playback 8 kHz, and check that the output level is ranged within -1 dB ± 3.5 dB compared to the output level during recording.
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