Samsung SCX-4521F Series - Set Malfunction - Causes and Solutions; LCD Display Defect; Defective OPE Keypad

Samsung Electronics
Service Manual
Troubleshooting
6-8
6.3 Set Malfunction – Causes and Solutions
6.3.1 LCD Display Defect ( in LCD Display)
• Description
Strange characters are displayed in the LCD Window and OPE Panel buttons do not work.
Check and Cause Solution
1. Clear the memory.
2. Check that the OPE HARNESS is connected to
the Connection Board correctly.
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.
6.3.2 Defective OPE Keypad
• Description
Pressing keys does not cause the set to respond correctly
Check and Cause Solution
1. Clear the memory.
2. Check that there is an audible key click when a key is
pressed.
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.