Motorola APX 2000 Detailed Service Manual

5-22 Troubleshooting Charts: Main Display Failure
5.5 Main Display Failure
No Display
End
Check DC on following
Signal
V_Ext_1.86
V_2.775D
Replace LCD
Check the following signals:
Signal
F_DISP_RW
F_DISP_DATA_CMD
F_DISP_RW_EN
OMAP_RESET
Is 6 < V < 9
Check U6504 circuitry.
Signals
Correct?
Check U6302 and U6101
display lines. Change faulty
part.
Verify connectors from J2302 to
front kit flex.
Problem still persist?
Connectors
Good?
Replace chassis subassembly
replace board or flex
with bad connector
Yes
No
Yes
No
Yes
No
Yes
No
Probe Point
TP2005 on keypad
TP2008 on keypad
Level
0V
1.85V. Hi = Data. Low = Command
1.85V. 4MHz Square
1.85V
Probe Point
R2135
R2147
R2142
OMAP_RESET_TP

Motorola APX 2000 Specifications

General

IP Rating	IP67
Operating Temperature	-30°C to +60°C
GPS	Optional
Bluetooth	No
Frequency Range	700/800 MHz
Power Output	1-5 W (VHF), 1-3 W (700/800 MHz)
Channels	Up to 1, 000
Battery Life	Up to 10 hours (digital)
Digital Protocol	APCO P25
Frequency	VHF: 136-174 MHz, UHF: 380-470 MHz, 700/800 MHz: 764-870 MHz
Power	1-3W (700/800 MHz), 1-5W (VHF)