Motorola W370/W375 Troubleshooting Chart, Level 1 and 2 Troubleshooting Chart

Level 1-2 Service Manual Troubleshooting

Troubleshooting

W370/W375 Troubleshooting Chart

Level 1 and 2 Troubleshooting Chart

Symptom	Probable Cause	Verification and Remedy
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
		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	Visually inspect the battery terminals on both the
	misaligned.	battery and the phone. Realign and, if necessary,
		either replace 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 phone turns on and stays on,
		disconnect the dc power source and reassemble
		with the new keypad.
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
distorted audio.
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
		LCM.
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
		and reassemble the phone with the new speaker.
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.
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.
	b) Earpiece Speaker defective.	Temporarily replace the earpiece speaker with a
		known good earpiece speaker. Ensure good
		connection. Place a call and verify improvement in
		earpiece audio. If fault is cleared, reassemble the
		phone with the good earpiece speaker.

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