Motorola M3588 service manual Repair Chart, Symptom Probable Cause Verification Remedy

M3588

6.4Repair Chart

Table 2. GSM M3588 Cellular Telephone: Troubleshooting and Repair Chart. (Assembly Replacement Level).

SYMPTOM	PROBABLE CAUSE	VERIFICATION AND
		REMEDY
Personal telephone will not turn	a) Battery pack either discharged	Measure battery. If the battery voltage is <4.00 V dc,
on or stay on	or defective	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 connectors open or	Visually inspect the battery connectors on both the
	misaligned.	battery assembly and the portable telephone.
		Re-align and, if necessary, replace either the
		Battery or the battery connector assembly. Removing
		the battery connector assembly has to be done with
		extreme care to avoid damaging the housings. If
		battery connectors are not at fault, proceed to c
	c) Logic/RF Board Assembly	Remove the Logic/RF Assembly. Substitute a known
	Defective.	good assembly and temporarily reassemble the unit.
		Depress the PWR button; if unit turns on and stays
		on, disconnect the dc power source and reassemble
		the telephone with the new Logic/RF Board
		assembly. Verify that the fault has been cleared. If
		the fault has not been cleared then proceed to d.
	d) Display circuit failure	Disassemble unit and remove LCD module and
		insert known good module. Insert Battery and
		depress PWR button. Ensure unit stays on, if OK
		reassemble unit in new housing assembly
2. Personal telephone exhibits poor	a) Antenna is defective	Check to make sure that the antenna pin is properly
reception and/or erratic operation		connected to the Logic/ RF assembly. If OK,
(such as calls frequently dropping,		substitute a known good antenna. If the fault is still
Weak and/or distorted audio, etc.).		Present, proceed to b.
	b) Logic/RF Board Assembly	Replace Logic/RF Assembly (refer to symptom 1c).
	Defective.	Verify that the fault has been cleared and
		Re-assemble the unit with the new PCB.
3. Display is erratic, or provides	a) Mating connections to / from	Remove rear housing from unit, check general
Partial or no display.	LCD Module faulty.	condition of flex connector from display. If OK
		check that the Zif connector is fully pressed down
		and that the flex collars are flush with the plastic of
		the connector.If not check Zif to PCB connections,
		if faulty connector, replace RF / Logic PCB. If Ok
		proceed to b.
	b) LCD module is	Substitute a known good LCD module onto the
	Defective.	suspect board and connect to DC Pwr supply
		depress PWR and ensure display is now correct,if
		Ok rebuild unit with new LCD module if LCD
		module is not at fault proceed to c.
	c) Logic/RF Board Assembly	Replace Logic/RF Assembly (refer to symptom 1c).
	Defective.	Verify that the fault has been cleared and
		Re-assemble the unit with the new PCB.

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