Main unit’s keys | LCD display position and letters |
| After the third key is pressed, the second digit displayed |
| will change from “ ” to “O ”. |
| |
|
|
|
|
VOL+ | After the second key is pressed, the third digit displayed |
VOL- | will change from “ ” to “O ”. |
HOLD OFF | The first digit displayed will change from “ ” to “O ”. |
5.After all keys have been pressed and there is no abnormality, “T OOO ” will be displayed.
6.Perform below voltage check about the keys come under if it is not displayed “T OOO ”.
Main unit’s keys | Check points | ON | OFF |
HOLD | TP428 | 0V | 2.2V |
| IC201 48pin | 0V | 2.2V |
|
|
|
|
| TP421 | 1.13V | 2.2V |
|
|
|
|
| TP421 | 1.69V | 2.2V |
|
|
|
|
VOL+ | TP421 | 0V | 2.2V |
VOL- | TP421 | 0.58V | 2.2V |
Note:
Refer to “10. Printed Circuit Board Diagram” for the test points.
7. Remove the battery when you exit from this mode.
7. Troubleshooting Guide
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