2-30 Service Manual
7100-XXX
Paper tray missing service check
Step Questions / actions Yes No
1 Turn printer off, and remove engine
controller board shield. See “Engine
controller board removal” on page 4-34
for steps to remove engine controller board
shield. Is cable properly connected to
engine controller board connector MCN7?
Go to step 2. Properly connect cable.
2 Turn printer on, and check for 5 VDC
between MCN7 pin 2 and ground. Is 5 VDC
present?
Go to step 4. Go to step 3.
3 Check for cable continuity between LVPS
ACN1 and engine controller board POCN. Is
continuity present?
Replace LVPS. See “Low
voltage power supply
(LVPS) with cage
removal” on page 4-40.
Go to step 4.
4 With paper tray removed, take voltage
readings between ground and engine
controller board MCN7 pins 4, 6, 8 and 10.
Do you read 0 VDC on all the pins?
Replace engine controller
board. See “Engine
controller board removal”
on page 4-34.
Go to step 5.
5 Check cable for continuity between engine
board MCN7 and paper size sensor. Also
check for shorted pins. Is cable okay?
Replace paper size sensor.
See “Left tray guide
assembly removal” on
page 4-42.
Replace cable by replacing
the left tray guide assembly.
See “Left tray guide
assembly removal” on
page 4-42.
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