Aiwa MSX-R14 Service Manual page 35

ELECTRICAL ADJUSTMENT -5/6
15.Playback Sensitivity Check (DECK 1, DECK 2)
Requirements
* Measuring instrument: Millivoltmeter
Test tape: TTA-200 (400 Hz)
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-200) to DECK 1 to playback.
(3) Check that the output level is ranged within 110 mV ± 3 dB.
(4) Apply the above steps (2) and (3) to DECK 2.
16.Playback/Record Frequency Response Adjustment (DECK 2)
Requirements
* Measuring instruments: Millivoltmeter
Audio signal oscillator (low-frequency oscillator)
Attenuator
Test tape: TTA-602 (NORMAL)
Test point: TP8 (Lch), TP9 (Rch)
Input point: AUX (1 kHz / 8 kHz)
Adjustment point: SFR451 (Lch), SFR452 (Rch)
(1) Connect the CH1 of millivoltmeter to TP8 (Lch) and the CH2 to TP9 (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 2, and record the 1 kHz signal from AUX.
(4) Adjust the attenuator so that the output levels of TP8 and TP9 become 10 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.
17.Playback/Record Sensitivity Check (DECK 2)
Requirements
* Measuring instrument: Same as Item 16.
Test tape: TTA-602 (NORMAL)
Test point: TP8 (Lch), TP9 (Rch)
Input point: AUX (10 kHz)
(1) Insert the test tape (TTA-602) to DECK 2, and record the 10 kHz signal from AUX.
(2) Adjust the attenuator so that the output levels of TP8 and TP9 become 100 mV.
(3) Playback 10 kHz, and check that the output level is ranged within 0 dB ± 2.5 dB compared to the output level during recording.
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