2-128 Service Manual
7526
920.27, 920.28, 920.29—POST (power on self test) service check
3
1. Disconnect the cable in connector JFDS1.
2. Connect the new top cover sensor.
3. Bring the printer up in the Diagnostics
menu (turn off the printer, press and hold
3 and 6, turn on the printer.)
4. Touch Sensor Tests.
5. Touch Dynamic Sensors.
6. Touch Top Door.
7. Activate the top cover sensor by pressing
the flag as shown.
Does the display on the touchscreen change
from Open to Closed?
Replace the top cover
sensor.
Replace the system board.
See “System board
removal” on page 4-165.
Step Questions / actions Yes No
1 Is the specified option the 550-sheet tray? Replace the 550-sheet tray
with a new 550-sheet tray
option.
Go to step 2.
2
Is the specified option the special media tray? Replace the special media
tray with a new special tray
option.
Go to step 3.
3
Is the specified option the high-capacity input
tray (HCIT)?
Replace the HCIT
controller board assembly.
See “HCIT controller
board assembly
removal” on page 4-295
Step Questions / actions Yes No
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