Akai S900

V. ADJUSTMENT
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Ic6
ot
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VRI
REC AMP
OFF-SET
PB AMP OFF-SET
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(VOICE 1) (VOICE 2) (VOICE 3) (VOICE 4) (VOICE 5) (VOICE 6) (VOICE 7) (VOICE 8)
VRIOI VR201 VR301 VR40l VRSO! VR60I VR70l VRBO!
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TP2O0l TP3Ol TP401 TPS5O! TP6OI TP7Ol
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GND
0
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P203
(2)
GND
0
Fig. 5-1 Adjustment points of VOICE PC Board
5-1. ADJUSTMENT OF REC AMP OFF-SET
1) Connect the digital DC voltmeter between TP] (REC AMP OFF-SET) and TP (GND).
2) Adjust VR1 (REC AMP OFF-SET) so that the reading on the digital DC voltmeter is DC 0 + 1 mV.
5-2. ADJUSTMENT OF PB AMP OFF-SET
1) Connect the digital DC voltmeter between TP101 (PB AMP OFF-SET) and TP (GND).
2) Set the REC LEVEL control to ““MIN”’ position, and record with no signal input condition.
3) After recording, read the voltage on the digital DC voltmeter, then push the PB button on the front panel and read the
voltage again.
4) Adjust VR101 (VOICE 1 PB AMP OFF-SET) so that the both reading voltages are equal or the voltages difference is
within +5 mV.
5) Adjust VR201 (VOICE 2 PB AMP OFF-SET) to VR801 (VOICE 8 PB AMP OFF-SET) as same maner as 1) to 4).
SERVICE MANUAL