General Troubleshooting 4-13
Printer Does Not Come to a Ready State
■ See “AC Power Supply Troubleshooting” on (page 4-14).
■ See "Fault Isolation" on (page 4-5).
Paper Size Switch Assembly
Paper size and tray presence is detected by the state of the upper, middle, and lower
switches of the Paper Size Switch. A failed or jammed switch effects the printer’s
ability to accurately detect paper size or the presence of the paper tray.
Power Supply
LVPS Overcurrent Protection Circuit
This circuit stops all outputs if the 24 VDC, 5 VDC or 3.3 VDC power supply is
shorted. The circuit is reset when the short is removed, the power is turned off, and
then on again.
Note
The 5V supply to the Image Processor Board is excluded. This circuit is
protected by a fuse (F101) which if blown, must be replaced.
LVPS Overvoltage Protection Circuit
This circuit stops all outputs if the 24 VDC, 5 VDC or 3.3 VDC power supply
exceeds the specified voltage. The operating point is 32 VDC or more for 24 VDC,
7
VDC or more for 5 VDC, or 6 VDC or more for 3.3 VDC.
Note
The circuit resets after a short period of time after the printer power is cycled.
Paper Size Switches
Upper Middle Lower
Legal 14" On On On
US Folio (Legal 13)" On On Off
Executive On Off On
B5 On Off Off
A4 Off On On
A5 (for reference, supported in Tray 1(MPT) only) Off On Off
Letter Off Off On
No Tray Off Off Off
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