Operator Panel Service Check; One Or More Operator Panel Buttons Fail; Operator Panel Display Blank, Five Beeps - Olivetti d-Color MF920 Service Manual

Operator panel service check

Warning: Replace one of the following components, and perform a POR before replacing a second
component. Never replace both of the components without performing a POR after installing each
one, or the printer will be rendered inoperable:
•
Operator panel assembly
•
Controller board
Warning: Never install and remove components listed above as a method of troubleshooting components.
Once a component has been installed in a printer, and the printer is powered on, it cannot be
used in another printer. It must be returned to the manufacturer.

One or more operator panel buttons fail

Step Questions / actions
1 Run the Button Test. See
page 3-13 in Diagnostics Menu.
Did any of the buttons fail the test?
2 Turn the printer off, and remove the rear
shield. "Rear shield removal" on page
Disconnect the operator panel assembly cable
at JOPP1 on the controller board. Turn on the
printer, and verify the following voltages:
Are the voltage values approximately correct?

Operator panel display blank, five beeps

Service tip: The printer has detected a problem with the controller board, the operator panel assembly cable
(part of the front cover assembly), or the operator panel assembly if POST does not complete. The printer emits
five beeps, and sticks in a continuous pattern until the printer is turned off.
Step Questions / actions
1 Is the operator panel assembly cable properly
installed at controller board JOPP1 and at the
operator panel assembly?
2-42
Service Manual
"Button Test" on
JOPP1
Pin Voltage
2 +5 V dc
4 Ground
5 +5 V dc
6 +3.3 V dc
7 Ground
Yes
Replace the operator panel
assembly. See
panel removal" on
page 4-98.
Replace the operator panel.
4-7. See "Operator panel
removal" on page
If the problem is not
resolved, replace the
operator panel cable. See
"Op panel cable" on
page 4-101
Yes
Go to step 2.
Go to step 2.
"Operator
Replace the controller
board. See
4-98. board removal" on
page 4-18.
Reinstall the cable.
No
"Controller
No
Y112730-2