Actions Yes No
Step 10
With only the 650‑sheet tray attached to the printer, print a page from
the 650 sheet tray.
Did the page print?
Go to step 11. Replace the 650‑sheet
tray.
Step 11
a Turn off the printer.
b Remove the rear cover. See “Rear cover removal” on page 307.
c Disconnect the cable at JOPT1 on the controller board.
d Turn the printer on.
e Measure to voltages below:
JOPT1:
Pin 2: Ground
Pin 3: Ground
Pin 5: +24 V dc
Pin 6: Ground
Pin 7: +5 V dc
Pin 9: Ground
Pin 10: Ground
Are the voltages correct?
Contact your next level
of support.
Replace the controller
board. See
“Controller
board removal” on
page 309.
Base printer symptoms
Symptom Action
Machine does not POR (no power) Go to
“Dead printer service check” on page 121.
False values display for front door Go to
“Front door sensor or switches service check” on page 123.
Narrow media sensor service check Go to
“Narrow media sensor service check” on page 127.
Operator panel (display is dim and unchanging)
service check
Go to
“Operator panel (display is dim and unchanging) service check” on
page 128.
Operator panel (displays all diamonds, no
beeps, or five beeps) service check
Go to
“Operator panel (displays all diamonds, no beeps, or five beeps)
service check” on page 131.
Operator panel (display blank) service check Go to
“Operator panel (display blank) service check” on page 133.
Operator panel (one or more operator buttons
fail) service check
Go to
“Operator panel (one or more operator panel buttons fail) service
check” on page 134.
Operator panel USB cable service check Go to
“Operator panel (one or more operator panel buttons fail) service
check” on page 134.
Toner meter cycle (TMC) card service check Go to
“Toner meter cycle (TMC) card service check” on page 137.
Printer not communicating with host (USB) Go to
“USB service check” on page 137.
Printer not communicating with host (Network) Go to
“Network service check” on page 137.
7527
Diagnostic information
120
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