Level | Troubleshooting |
Troubleshooting
W370/W375 Troubleshooting Chart
Level 1 and 2 Troubleshooting Chart
Symptom | Probable Cause | Verification and Remedy |
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1. Phone will not turn on or stay on. | a) Battery either discharged or | Measure battery voltage across a 50 ohm (>1 Watt) |
| defective. | load. If the battery voltage is <3.25 Vdc, recharge |
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| the battery using the appropriate battery charger. If |
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| the battery will not recharge, replace the battery. If |
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| battery is not at fault, proceed to b. |
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| b) Battery terminals open or | Visually inspect the battery terminals on both the |
| misaligned. | battery and the phone. Realign and, if necessary, |
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| either replace battery or refer to a Level 3 Service |
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| Center for the battery connector replacement. If |
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| battery terminals are not at fault, proceed to c. |
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| c) Keypad defective. | Replace the keypad. Temporarily connect a +3.6 |
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| Vdc supply to the battery terminals. Press and hold |
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| the PWR button. If phone turns on and stays on, |
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| disconnect the dc power source and reassemble |
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| with the new keypad. |
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2. Phone exhibits poor reception or | Connections to or from lower | Check connection between the antenna and the |
erratic operation such as calls | PCB defective. | lower PCB. |
frequently dropping or weak or |
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distorted audio. |
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3. Display is erratic, or provides | LCM defective. | Replace the LCM. Verify that the fault has been |
partial or no display. |
| cleared and reassemble the phone with the new |
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| LCM. |
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4. Incoming call alert transducer | Speaker defective. | Replace the speaker as described in the |
audio distorted or volume is too low. |
| procedures. Verify that the fault has been cleared |
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| and reassemble the phone with the new speaker. |
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5. Phone transmit audio is weak. | Microphone defective. | Replace the microphone as described in the |
(usually indicated by called parties |
| procedures. Verify that the fault has been cleared |
complaining of difficulty in hearing |
| and reassemble the phone with the new |
voice). |
| microphone. |
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6. Receive audio from earpiece | a) Connections to or from lower | Check connection between the antenna and the |
speaker is weak or distorted. | PCB defective. | lower PCB. If the connection is OK, proceed to b. |
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| b) Earpiece Speaker defective. | Temporarily replace the earpiece speaker with a |
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| known good earpiece speaker. Ensure good |
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| connection. Place a call and verify improvement in |
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| earpiece audio. If fault is cleared, reassemble the |
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| phone with the good earpiece speaker. |
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Aug.15, 2006 | 39 |