2-101
Confidential
3.12.4 A communication error occurs
3.12.5 Reception mode cannot be changed
3.12.6 Caller ID are not displayed
3.12.7 Cannot talk on the handset
Step Cause Remedy
1 NCU PCB failure Replace the NCU PCB ASSY.
2 Main PCB failure Replace the main PCB ASSY.
User Check
• Turn OFF the Distinctive ring mode.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.
User Check
• Verify that the handset curled cord is securely inserted into the socket.
• Adjust the handset volume.
Step Cause Remedy
1 Handset curled cord failure Replace the handset curled cord.
2 Handset ASSY failure Replace the handset ASSY.
3 Hook switch PCB ASSY failure Replace the hook switch PCB ASSY.
4 Main PCB failure Replace the main PCB ASSY.