Motorola 388 Service Manual download pdf (Page 32)

Level 1-2 Service Manual

May 30, 2008 32

Troubleshooting Chart

Table 4: 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

defective.

Measure battery voltage across a 50 ohm (>1

Watt) load. If the battery voltage is <3.25 Vdc,

recharge the battery using the appropriate

battery charger. If the battery will not

recharge, replace the battery. If battery is not

at fault, proceed to b.

b) Battery terminals open or mis-

aligned.

Visually inspect the battery terminals on both

the battery and the telephone. Realign and, if

necessary, either replace the battery or refer

to a Level 3 Service Center for the battery

connector replacement. If battery terminals

are not at fault, proceed to c.

c) keypad defective. Replace the keypad. Temporarily connect a

+3.6 Vdc supply to the battery terminals.

Press and hold the PWR button. If unit turns

on and stays on, disconnect the dc power

source and reassemble with the new keypad.

2. Telephone exhibits poor reception or

erratic operation such as calls frequently

dropping or weak or distorted audio.

Connections to or from lower PCB

defective.

Check connection between the antenna and

the lower PCB.

3. Display is erratic, or provides partial

or no display.

LCM defective. Replace the LCM. Verify that the fault has

been cleared and reassemble the unit with

the new LCM.

4. Incoming call alert transducer audio

distorted or volume is too low.

Speaker defective. Replace the speaker as described in the pro-

cedures. Verify that the fault has been

cleared and reassemble the unit with the new

speaker.

5. Telephone transmit audio is weak.

(usually indicated by called parties com-

plaining of difficulty in hearing voice).

Microphone defective. Replace the microphone as described in the

procedures. Verify that the fault has been

cleared and reassemble the unit with the new

microphone.

6. Receive audio from earpiece speaker

is weak or distorted.

a) Connections to or from lower

PCB defective.

Check connection between the antenna and

the lower PCB. If the connection is OK, pro-

ceed to b.

b) Speaker defective. Temporarily replace the speaker with a

known good speaker. Ensure good connec-

tion. Place a call and verify improvement in

earpiece audio. If fault is cleared, reassemble

the telephone with the good speaker.

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