SERVICE MANUAL - O. Rensch OHG
SERVICE MANUAL - O. Rensch OHG
SERVICE MANUAL - O. Rensch OHG
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2DC<br />
2-3-3 Power supply board<br />
The power supply board provides the AC power input and DC power and outputs. The high voltage bias generator circuit is<br />
mounted on a separate board. A simplified schematic diagram is shown below.<br />
Power supply unit<br />
AC<br />
input<br />
Power<br />
switch<br />
Current<br />
fuse<br />
(SW1)<br />
(F1)<br />
Noise<br />
filter<br />
circuit<br />
Exit<br />
sensor<br />
EXITN<br />
Transformer<br />
(T1)<br />
24 V DC<br />
rectifier/<br />
smoothing<br />
circuit<br />
24 V DC<br />
shutoff<br />
circuit<br />
+24V1<br />
SLEEPN<br />
FAN<br />
Cooling fan<br />
+24V1<br />
FET<br />
(Q1)<br />
Switching/<br />
Over<br />
current<br />
detection<br />
circuit<br />
5 V DC<br />
rectifier/<br />
smoothing<br />
circuit<br />
+5 V<br />
PGND, SGND<br />
THERM<br />
Photocoupler<br />
(PC1)<br />
Over voltage<br />
detection<br />
circuit<br />
Thermistor<br />
+24V2<br />
Heater<br />
lamp<br />
Triac<br />
(TRC1)<br />
Photocoupler<br />
(PC3)<br />
Transistor<br />
(Q8)<br />
Zero cross signal<br />
detection circuit<br />
ZCROSS<br />
Thermal<br />
cutout<br />
Photo-<br />
Triac<br />
(PC2)<br />
HEATN<br />
Figure 2-3-7 Power supply board circuit block diagram<br />
2-3-8
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