Samsung CLX-8540ND Service Manual page 45

2.3.2.7 Fuser Drive Board
The FDB (Fuser Drive Board) controls 2 halogen lamps in the fuser unit using control signals which are
provided from the ENGINE PBA and supplies AC power to the SMPS. Both V1/V2 FDBs provide max.
1500W output power.
When the phase signal of AC Power goes to zero, the FDB sends a zero-crossing detect signal to the
ENGINE PBA. The zero-crossing output consists an open-collector node.
2 2
1 1
VARISTOR
• Connection
1 INLET AC
2 FUSER CONTROL (from Main board)
3 FUSER AC (to Fuser lamp)
4 SMPS AC ( to SMPS)
• Specification
Input Voltage
(Range)
Input Current
Output Power
Phase Detect
Protection
Service Manual
Product Overview
FUSE PHOTO TRAIC
V1
AC 110V
(90 ~ 135V)
20A
Max. 1500W
Zero-Crossing Detect
(Open Collector Output)
Relay Control Signal
HEAT SINK
V2
AC 220V
(180 ~ 270V)
10A
Max. 1500W
2-34
3 3
4 4
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