Toshiba GD-1210 Service Manual page 83

The relation between the signals and sound volume is as follows.
Sound volume VOLSEL2
Max. (7)
(6)
(5)
(4)
(3)
(2)
Min. (1)
Silent (0)
The monitoring signal whose volume is controlled by IC9 [IC2] is amplified by the OP amplifier (IC10
[IC1]), then output to the speaker.
Signal Name Type
SP-SEL O
MON O
VOLSEL0-2 O
* Values in [ ] are for GD-1250/1270 in case that the descriptions vary between GD-1210 and GD-
1250/1270.
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VOLSEL1
LOW LOW
LOW LOW
LOW HIGH
LOW HIGH
HIGH LOW
HIGH LOW
HIGH HIGH
HIGH HIGH
Active
H Line/Tone Selection Signal
H Ring/Tone Selection Signal
H Speaker Volume Control Signals 0-2
4 - 15
08/04
VOLSEL0
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
Description Destination
IC3
IC3
IC9 [IC2]
GD-1210/1250/1270/1160/1260
ELECTRICAL CIRCUITS
4