Samsung SCX-4720F Service Manual page 106

7.2 Set Malfunction – Causes and Solutions
7.2.1 LCD Display Defect (
• Description
Strange characters are displayed in the LCD Window and OPE Panel buttons do not work.
Check and Cause
1. Clear the memory. (see page 6-18)
2. Check that the OPE HARNESS is connected to
the Connection Board correctly.
7.2.2 Defective OPE Keypad
• Description
Pressing keys does not cause the set to respond correctly
Check and Cause
1. Clear the memory. (See page 6-18).
2. Check that there is an audible key click when a key is
pressed.
Samsung Electronics
in LCD Display)
1. Try again after clearing the memory.
2. If re-connecting the harness does not correct
the fault replace the OPE Ass'y and the main
Board in sequence.
1. Check that the keypad is assembled correctly and
the membrane is not damaged, replace the
membrane or whole keypad assembly if necessary.
2. If the fault remains replace the OPE Ass'y and the
Main board in sequence.
Troubleshooting
Solution
Solution
Service Manual
7-5