Sharp MX-C507P Service Manual page 278

950.xx NVRAM failure service check
Warning—Potential Damage: When replacing any of the following components, replace only one
component at a time or the printer will be rendered inoperable:
Replace the required component, bring the printer up in Diagnostics mode, and then verify that the problem is
fixed before performing a POR.
This error indicates a mismatch between the operator panel assembly and the system board.
Actions
Step 1
Verify if the control panel has been replaced.
Has the control panel been replaced?
Step 2
Replace the control panel with a new, and not previously installed,
"Upper control panel removal" on page
UICC card. See
Does the problem remain?
Step 3
Verify if the controller board has been replaced.
Has the controller board been replaced?
Step 4
Replace the controller board with a new, and not previously
installed, controller board. See
page 393.
Does the problem remain?
Step 5
a
Turn the printer off for ten or more seconds.
b
Turn the printer back on.
Does the problem remain?
"Controller board removal" on
Diagnostics and troubleshooting
244
Yes
Go to step 2.
Go to step 3.
317.
Go to step 4.
Go to step 5.
Go to step 6.
5028
No
Go to step 3.
The problem is
solved.
Go to step 5.
The problem is
solved.
The problem is
solved.