Specifications

Appendix A
LG31 SYSTEM FUSES
Table A–1 locates, describes, and rates all LG31 system fuse and circuit
breakers.
Table A–1: The LG31 System Fuses
Location Purpose/Description Number
SMMC Protects 42V ribbon motor and
paper motor power stages.
F1 (3A, 125.1V)
Protects 42V bus line. F2 (3A, 125.1V)
Protects 42V power line on
Shuttle power stage.
F3 (3A, 125.1V)
SPSM Input Voltage (100-240V) F1 (0.5A, 250V)
Protects each power stage. F2, F3, F4, F5 (3A, 250 V)
SPSR Backup for current limiting
circuit protecting power
transistor Q44. Fuse opens if
Q44 is shorted.
F1 (6A, 250V)
SPSX† Protects neutral power line if
required (NOT SUPPLIED).
Back
Panel
Main power supply protection. Circuit Breaker ON/OFF
switch
†The SPSX board is found in the ac switch box.
LG31 SYSTEM FUSES A–1