Actions Yes No
Step 8
Turn the printer off, and remove the rear shield. See
“Rear cover removal”
on page 307.
Verify the cable is correctly connected to JFUSES1 on the controller board
and to the sensor.
Is the sensor cable properly connected?
Go to step 9. Reconnect the cable. If
the problem persists,
then go to step 8.
Step 9
Turn the printer on, and check the values at JFUSES1:
Pin 8: Ground
Pin 9: +3.3 V dc
Are the values approximately correct?
Replace the duplex
sensor. See
“Duplex
sensor removal” on
page 302.
Replace the controller
board. See
“Controller
board removal” on
page 309.
24y paper jams
[x]‑page jam, open tray [x] [24y.xx]
1 Pull out the tray completely.
Note: The message on the printer display determines in which tray the paper jam is located.
7527
Diagnostic information
67
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