Level 1 and 2 Service Manual

Troubleshooting

Troubleshooting Chart

Table 4. E389/E399 Telephone: Level 1 and 2 Troubleshooting Chart

Symptom

Probable Cause

Verification and Remedy

 

 

 

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,

 

 

recharge the battery using the appropriate

 

 

battery charger. If battery will not recharge,

 

 

replace the battery. If battery is not at fault,

 

 

proceed to b.

 

 

 

 

b) Battery terminals open or

Visually inspect battery terminals on both the

 

misaligned.

battery and the telephone. Realign and, if

 

 

necessary, either replace the battery or refer to

 

 

a Level 3 Service Center for battery connector

 

 

replacement. If battery terminals are not at fault,

 

 

proceed to c.

 

 

 

 

c) Transceiver board defective.

Remove the transceiver board assembly.

 

 

Substitute a known good transceiver board and

 

 

temporarily reassemble the phone. Press the

 

 

Power/End key; if phone turns on and stays on,

 

 

disconnect the dc power source and reassemble

 

 

the phone with the new transceiver board. Verify

 

 

that the fault has been cleared.

 

 

 

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

 

 

still present, proceed to b.

 

 

 

 

b) Transceiver board defective.

Replace the transceiver board (refer to 1c).

 

 

Verify that the fault has been cleared and

 

 

reassemble the phone with the new transceiver

 

 

board.

 

 

 

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

 

 

connector is fully seated. If not, check connector

 

 

to transceiver board connections. If faulty

 

 

connector, replace the transceiver board

 

 

assembly. If connector is not at fault, proceed to

 

 

b.

 

 

 

 

b) Display assembly defective.

Temporarily replace the display assembly with a

 

 

known good assembly. If fault has been cleared,

 

 

reassemble with the new display assembly. If

 

 

fault not cleared, proceed to c.

 

 

 

 

c) Transceiver board assembly

Replace the transceiver board assembly (refer

 

defective.

to 1c). Verify that the fault has been cleared and

 

 

reassemble the unit with the new transceiver

 

 

board assembly.

 

 

 

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

 

 

cleared, reassemble with the new speaker

 

 

assembly. If fault not cleared, proceed to

 

 

 

 

b) Faulty transceiver board assembly.

Replace the transceiver board assembly (refer

 

 

to 1c). Verify that the fault has been cleared and

 

 

reassemble the unit with the new transceiver

 

 

board assembly.

 

 

 

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).

 

 

 

 

 

6809480A37-O

April 21, 2004

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