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Operation of Control Parts
2-35 CL-S6621
1
2
J106
[SA, Main PCB]
U1A
CPU
D30
130
FANCTL_R
12
2
J102
[SA, Ribbon PCB]
FANCTL
12
2
18-20
18-20
SA, Fan
+5V
D101
+5V
J19
+5V
Q101
R107
2SK3664
(4) Buzzer driver
This circuit drives the buzzer.
To sound the buzzer, the CPU outputs a pulse waveform from pin 171 (BUZZER). The
transistor Q24 turns ON and OFF, and the buzzer sounds.
(5) Fan driver
This circuit drives the cooling fan (“SA, Fan”) for ribbon motors.
When pin 130 (FANCTL_R) is set to “Low” level, Q101 turns ON and the fan is driven.
The fan is driven according to the temperature raise of the “SA Ribbon Motor F”.
When the temperature detected by the thermistor bonded to the “SA Ribbon Motor F” is under
45
°C (113°F), the fan is not driven.
When the temperature exceeds 45
°C (113°F) during ribbon motor running, the fan starts to
turn.
If the temperature is 60
°C (140°F) or more after the ribbon motor is stopped, the fan is kept
turned until the temperature falls below 60
°C (140°F).
U1A
CPU
BUZZER
+24V
[SA, Main PCB]
P77
171
R111
Q24
DTC114EM
BZ1
Fan turns.
(While ribbon motor is
runnin
g
.
)
Fan does not turn.
Fan turns.
- While ribbon motor is
running.
- Even if motor is not
running.
60°C
(140
°F)
45°C
(113
°F)