Fan Driver - Citizen CLP-621 Technical Manual

2-2. Operation of Control Parts

(4-5) Fan driver

This circuit drives the ribbon motor cooling fan.
When pin 130 (FANCTL) is set to "Low" level, TR5 turns ON and the fan is driven.
The fan is driven according to the Ribbon Motor F temperature detected by the ribbon
motor temperature sensor.
When the temperature 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 70 ° C (158 ° F) or more after the ribbon motor is stopped, the fan is kept
turned until the temperature falls under 70 ° C (158 ° F).
IC1
CPU
130 FANCTL
D30
(5) Other circuits
(5-1) +3.3V/+1.5V circuit
The Main PCB receives +5V and +24V from the Power Supply Unit. +5V and +24V are
used for control circuits and driver circuits, respectively.
IC15 and IC16 are the regulator ICs to produce +3.3V and +1.5V from +5V.
+3.3V is used for various logic circuits. +1.5V is supplied to the CPU (IC1) only.
CN10
1
2
From
3
Power
4
Supply
5
Unit
4
6
7
8
[Main PCB]
CLP-621 & CLP-631
+5V
CN21
TR5
CN8
2SK3577
R130
R131
[Main PCB]
+5V
+5V
T16
+
EC1
C81
+24V
T18
+24V
1
D701
1
+5V
19
11
FANOUT
CN701
[Ribbon Main PCB]
+3.3V Regulator
D9
IC15
1
Vout
Vin
2
GND
GND
uPC2933AT
+1.5V Regulator
D10
IC16
4
Vout
Vin
1
NC
3
VSS
CE
XC6209F152PR
2-32
+5V
F702
Ribbon Motor Fan
1
Fan
2
CN706
+3.3V
T17
P222
3
+
EC2 C78
4
+1.5V
T19
P223
5
C80
C79
2
+3.3V
+1.5V