Motorola M3588 service manual Symptom Probable Cause

M3588

SYMPTOM PROBABLE CAUSE VERIFICATION AND REMEDY

4.Incoming call alert transducer audio distorted or volume is too low.

a)Faulty alert Transducer / Main RF / Logic PCB defective

Replace Logic/RF Board Assembly (refer to symptom 1c). Verify that the fault has been cleared and re-assemble the unit with the new PCB.

5. Personal telephone transmit audio	a) Microphone connections to	Gain access to the Microphone as described in the
is weak, (usually indicated by called	The main RF / Logic board are	DISASSEMBLY instructions in this manual. . Check
parties complaining of difficulty in	defective.	connections. If connector is faulty proceed to c if the
hearing voice from personal phone).		connector is OK, proceed to b.
	b) Microphone defective	Gain access to microphone .Disconnect and
		substitute a known good Microphone. Place a call
		and verify as heard by called party. If good, re-
		assemble portable with new Microphone. If
		Microphone is not at fault, re-install original
		Microphone and proceed to c.
	c) Logic/RF Board Assembly	Replace Logic/RF Board Assembly (refer to
	defective.	symptom 1c). Verify that the fault has been cleared
		and re-assemble the unit with the new PCB.
6. Personal telephone receive audio	a) Connections to/from speaker	Gain access to Logic/RF board as described in the
is weak and/or distorted. (From	and Logic/RF Circuit board	DISASSEMBLY instructions in this manual. Check
speaker)	defective.	pads on the Logic/RF circuit board. Clean pads if
		necessary. If pad is at fault proceed to d. If
		connection is not at fault, Proceed to b.
	b) Earpiece Speaker defective.	Remove speaker from front housing and insert
		known good speaker. Place a call and verify
		improvement in earpiece audio. If better, reassemble
		the phone with the good speaker. If it was no better
		then proceed to c.
	c) Antenna assembly is	Attempt a re-phasing of the unit and recheck the
	defective.	symptom. If symptom is the same but unit re-phases
		correctly, check to make sure the antenna
		connector is correctly soldered to the main board and
		that the antenna is fitted correctly. If ok, substitute a
		known good antenna assembly. If this does not cure
		the fault, re-install the original assembly then
		proceed to d.
	d) Logic/RF Board Assembly	d) Replace Logic/RF Assembly (refer to symptom
	Defective.	1c). Verify that the fault has been cleared and
		Re-assemble the unit with the new PCB.
7. Personal telephone will not	a) SIM card defective	Initially check that the contacts on the card are not
recognize/accept SIM card		dirty. Clean if necessary, and check if fault has been
		eliminated. If the contacts are clean, insert a
		Known good SIM card into the portable telephone.
		Power up the unit and confirm whether or not the
		card has been accepted. If the fault no longer
		Exists, the defective SIM card should be replaced. If
		the SIM card is not at fault, proceed to b.
	b) Logic/RF Board Assembly	Replace Logic/RF Board Assembly (refer to
	Defective.	symptom 1c). Verify that the fault has been cleared
		and re-assemble the unit with the new PCB.
SYMPTOM	PROBABLE CAUSE	VERIFICATION AND REMEDY
8. Phone does not sense when flip	a) Magnet in flip defective	Replace Front / flip assembly with known good one
isb		refer to the DISASSEMBLY instructions in this
Opened or closed (usually indicated		manual. Place call to portable phone and verify
by inability to answer incoming calls		ability to answer by opening flip. If faulty rebuild
by opening the flip, or inability to		phone with new front / flip Assy. If fault is still
make outgoing calls).		present, replace original front/flip assembly and
		proceed to b.
	b) Reed Switch defective	Gain access to RF / Logic PCB as described in the
		DISASSEMBLY instructions in this manual.
		Unsolder the reed switch and replace with a known

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