CHAPTER 6 TROUBLESHOOTING
6-32
F-4
No bell ring.
Possible cause
Step
Check
Result
Remedy
Ring delay
1
Ring delay is set to "0".
Yes
Set the ring delay to other
than "0".
Ring volume
2
Ring volume is set to "OFF".
Yes
Set the ring volume to other
than "OFF".
Connection
between main
PCB, relay PCB,
and scanner unit
3
Main PCB, relay PCB, and
scanner unit are properly
connected.
No
Fix the connection properly.
Harness
between main
PCB, relay PCB,
and scanner unit
4
Harness wire is damaged.
Yes
Replace the harness with a
normal part.
Connection
between main
PCB and NCU
PCB
5
Main PCB and NCU PCB are
properly connected.
No
Fix the connection properly.
Harness
between main
PCB and NCU
PCB
6
Harness wire is damaged.
Yes
Replace the harness with a
normal part.
Speaker 7
Replacement of speaker
solves the problem.
Yes
Replace the speaker with a
normal part.
Relay PCB
8
Replacement of relay PCB
solves the problem.
Yes
Replace the relay PCB with a
normal part.
NCU PCB
9
Replacement of NCU PCB
solves the problem.
Yes
Replace the NCU PCB with
a normal part.
Main PCB
10
Replacement of main PCB
solves the problem.
Yes
Replace the main PCB with
a normal part.
Summary of Contents for DCP-8020
Page 264: ...CHAPTER 7 MAINTENANCE MODE 7 6 Fig 7 3 l m a b c d e f g h i j k ...
Page 335: ...APPENDIX 4 CIRCUIT DIAGRAMS A 50 Appendix 4 1 Main PCB Circuit Diagram 1 6 ...
Page 337: ...APPENDIX 4 CIRCUIT DIAGRAMS A 52 Appendix 4 3 Main PCB Circuit Diagram 3 6 ...
Page 339: ...APPENDIX 4 CIRCUIT DIAGRAMS A 54 Appendix 4 5 Main PCB Circuit Diagram 5 6 ...
Page 341: ...APPENDIX 4 CIRCUIT DIAGRAMS A 56 Appendix 4 7 Driver PCB Circuit Diagram ...
Page 343: ...APPENDIX 4 CIRCUIT DIAGRAMS A 58 Appendix 4 9 Engine PCB Circuit Diagram 2 2 ...
Page 345: ...APPENDIX 4 CIRCUIT DIAGRAMS A 60 Appendix 4 11 NCU PCB Circuit Diagram Europe ...
Page 347: ...APPENDIX 4 CIRCUIT DIAGRAMS A 62 Appendix 4 13 NCU PCB Circuit Diagram Oceania ...
