Level 1 and 2 Service Manual | Troubleshooting |
Troubleshooting Chart
Table 4. E389/E399 Telephone: Level 1 and 2 Troubleshooting ChartSymptom | Probable Cause | Verification and Remedy |
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1. Telephone will not turn on or stay on. | a) Battery either discharged or | Measure battery voltage across a 50 ohm |
| defective. | (>1 Watt) load. If battery voltage is <3.25 Vdc, |
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| recharge the battery using the appropriate |
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| battery charger. If battery will not recharge, |
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| replace the battery. If battery is not at fault, |
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| proceed to b. |
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| b) Battery terminals open or | Visually inspect battery terminals on both the |
| misaligned. | battery and the telephone. Realign and, if |
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| necessary, either replace the battery or refer to |
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| a Level 3 Service Center for battery connector |
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| replacement. If battery terminals are not at fault, |
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| proceed to c. |
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| c) Transceiver board defective. | Remove the transceiver board assembly. |
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| Substitute a known good transceiver board and |
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| temporarily reassemble the phone. Press the |
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| Power/End key; if phone turns on and stays on, |
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| disconnect the dc power source and reassemble |
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| the phone with the new transceiver board. Verify |
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| that the fault has been cleared. |
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2. Telephone exhibits poor reception or | a) Antenna defective. | Check connection between the antenna and the |
erratic operation such as calls frequently |
| transceiver board. If the connection is OK, |
dropping or weak or distorted audio. |
| substitute a known good antenna. If the fault is |
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| still present, proceed to b. |
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| b) Transceiver board defective. | Replace the transceiver board (refer to 1c). |
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| Verify that the fault has been cleared and |
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| reassemble the phone with the new transceiver |
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| board. |
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3. Display is erratic, or provides partial or | a) Transceiver board connections | Check general condition of flexible printed cable |
no display. | faulty. | (flex). If the flex is good, check that the flex |
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| connector is fully seated. If not, check connector |
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| to transceiver board connections. If faulty |
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| connector, replace the transceiver board |
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| assembly. If connector is not at fault, proceed to |
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| b. |
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| b) Display assembly defective. | Temporarily replace the display assembly with a |
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| known good assembly. If fault has been cleared, |
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| reassemble with the new display assembly. If |
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| fault not cleared, proceed to c. |
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| c) Transceiver board assembly | Replace the transceiver board assembly (refer |
| defective. | to 1c). Verify that the fault has been cleared and |
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| reassemble the unit with the new transceiver |
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| board assembly. |
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4. Incoming call alert transducer audio | a) Speaker assembly defective | Temporarily replace the speaker assembly with |
distorted or volume is too low. |
| a known good assembly. If fault has been |
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| cleared, reassemble with the new speaker |
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| assembly. If fault not cleared, proceed to |
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| b) Faulty transceiver board assembly. | Replace the transceiver board assembly (refer |
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| to 1c). Verify that the fault has been cleared and |
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| reassemble the unit with the new transceiver |
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| board assembly. |
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5. Telephone transmit audio is weak. | a) Microphone defective. | Replace the microphone as described in the |
(usually indicated by called parties |
| procedures. If fault is not cleared, proceed to b. |
complaining of difficulty in hearing voice). |
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April 21, 2004 | 35 |