■Speaker is silent during
Step | Possible cause | Check | Result | Remedy |
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| Connection | Are the main PCB and |
| Reconnect the connector |
1 | between main | speaker connected | No | properly. |
PCB and | properly? |
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| speaker |
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| Speaker | Is the problem solved |
| Replace the Speaker. |
2 |
| after replacing the | Yes |
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| speaker? |
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| Connection | Are the main PCB and |
| Reconnect the connector |
3 | between main | NCU PCB connected | No | properly. |
PCB and NCU | properly? |
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| PCB |
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| Harness | Is the harness |
| Replace the harness with a |
4 | between main | damaged? | Yes | normal one. |
PCB and NCU |
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| PCB |
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| Connection | Are the main PCB and |
| Reconnect the connector |
5 | between main | control panel PCB | No | properly. |
PCB and control | connected properly? |
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| panel PCB |
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| Harness | Is the harness |
| Replace the harness with a |
6 | between main | damaged? | Yes | normal one. |
PCB and control |
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| panel PCB |
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| NCU PCB | Is the problem solved |
| Replace the NCU PCB |
7 |
| after replacing the NCU | Yes | ASSY. |
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| PCB ASSY? |
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| Main PCB | Is the problem solved |
| Replace the main PCB |
8 |
| after replacing the main | Yes | ASSY. |
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| PCB ASSY? |
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■Dialing function does not switch between "tone" and "pulse".
Step | Possible cause | Check | Result | Remedy |
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| Connection | Are the main PCB and |
| Reconnect the connector |
1 | between main | NCU PCB connected | No | properly. |
PCB and NCU | properly? |
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| PCB |
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| Harness | Is the harness |
| Replace the harness with a |
2 | between main | damaged? | Yes | normal one. |
PCB and NCU |
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| PCB |
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| NCU PCB | Is the problem solved |
| Replace the NCU PCB |
3 |
| after replacing the NCU | Yes | ASSY. |
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| PCB ASSY? |
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| Main PCB | Is the problem solved |
| Replace the main PCB |
4 |
| after replacing the main | Yes | ASSY. |
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| PCB ASSY? |
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Confidential |