UF-7000, UF-8000, UF-7100, UF-8100 (serv.man2) - Panasonic Fax Service Manual (repair manual). Page 13

13

SEPT 2005

Ver. 2.0

UF-7100/8100

UF-7000/8000

The fuser temperature is controlled by IC006 (Engine CPU). IC006 has an analog to digital (A/D) converter 
(AN0-AN7).
Thermistor TH is connected to IC006 (AN0). When IC006 (Pin31) is Low, Q009 is turned Off. And Q003 is 
turned On. Then Halogen Lamp in Fuser Unit is turned On.
When Front Cover is opened, the Front Cover Safety Interlock Switch is opened and the Halogen Lamp is 
turned Off.

Abnormal temperature detection circuit consists of the following 2 sub-sections.

1. Abnormally Low Temperature Detection

When abnormally low temperature is detected by IC006 (Engine CPU), the IC006 turns Off the 
Halogen Lamp.

2. Abnormally High Temperature Detection

When abnormally high temperature is detected by IC006 (Engine CPU), the IC006 turns Off the 
Halogen Lamp. If the Halogen Lamp is not turned Off by IC006 though the temperature of Halogen 
Lamp is abnormally high, the IC003 turns Off the Halogen Lamp electrically.

+5V

C069

C076

C077

R064

R070

R073

+24V +24VIR

R061

R062

GND (+24V)

R063

R077

R065

R066

TH

Front Cover 

Safety 

Interlock SW

GND (+5V)

THERMISTOR

IC006

(Engine CPU)

5
4

nDOPEN

2

17

P63

AN0

3

nFSRCTL

R081

PPG01

31

Q009

R072 R071

R067

R068

R076

R075

+24VIR

Q003

nFCTL

Halogen

Lamp

Drive

Circuit

LVPS

Unit

+

-

IC003

R161

R160

7
6

1

+

-

IC003