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10.5 FUSER HEAT CONTROL
1
FUSER ASSEMBLY
FUSER
THERMISTOR
CN1009
10
T
1
2
4
3
FUSER LINK
9
3
NEW FUSER
DETECT SIGNAL
5
4
1 THE PCU USES INPUT FROM THE THERMISTOR TO GATE THE
TRIAC AND SWITCH THE HEAT ROD ON.
VOLTAGE AT CN103-9,
COLD FUSER APPX. O VDC
HOT FUSER APPX . 3.5 VDC
5
THE AC ON (L) SIGNAL SWITCHES THE AC OFF WHEN THE
2
INTERLOCKS ARE OPEN, OR WHEN A MALFUNCTION OCCURS.
THE FUSER LINK IS USED TO DETECT WHEN A NEW FUSER
3
ASSEMBLY IS INSTALLED. IT MELTS OPEN AND RESETS THE
FUSER COUNT.
4
115 VAC PRINTERS, AC1 = 115 VAC - AC2 = NEUTRAL
220 VAC PRINTERS, AC1 = 110 VAC - AC2 = 110 VAC
6
Status
Description
Codes
T0 The Thermistor is open.
T1 The temperature is below 85°C
T2 The temperature is above 240°C
CONNECTOR
7
PWB
BSDs
Chain 10 Copy Transportation and Fusing
C D E
PCU
PWB
CONN.
PL 4.2
PWB
PL10.4
T0
CN304 CN103
CN306
2
3
9
T1
+ 5
2
VDC
T2
+ 24 VDC
INTER
LOCKED
2
+ 5
1
VDC
4
1 8
OVERHEAT
THERMOSTAT
LVPS PWB
PCU PWB
2/99
7-20
F G
LVPS
PL 3.1
Chain 1.2
AC1
4
FUSER
Gate Control
ON (L)
CN107 CN703
+22 VDC
18
4
HEAT ROD
SENSE (L)
+ 22 VDC
22 8
+ 24 VDC INTERLOCKED
2
16
AC ON (L) +24 VDC
20 6
Chain 1.2
AC2
4
ST704
CN1004
HEAT ROD
2
CN1008
THERMISTOR
CN1009
2
H J
ST703
FUSER
RELAY
1
1
FUSER ASSEMBLY
HEAT ROD OVERHEAT
THERMOSTAT
COPY TRANSPORTATION
AND FUSING
CHAIN 10 LEVEL 2
SHEET 2 0F 2
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