Motorola ASTRO Digital XTL 5000 Detailed Service Manual

May 25, 2005 6881096C74-B
5-8 Troubleshooting Charts: Troubleshooting Tables
Radio Dead, Display
Does Not Light Up
Blown Fuse Check fuse in red lead of power
cable (or green lead if used)
Absence of signal may indicate
failure with J0401, J0402,
VR0412, or VR0402
Controller Section • Check for IGNITION at J0401-
27, 28
• Check for A+ at Q0503,
VR0950, J0401-19,21, or
TP0414
• Absence of signal may indicate
failure with J0401
• Absence of signal may indicate
failure with J0950, J0401 or
VR0950
Flex/Control Head Check for SW_B+_CH at J0401-
33,34, TP0413, or pin 21 of P502
(on control head)
Absence of signal may indicate
failure with flex, control head
Radio Dead, Display
Lights Up
Regulators • Check for SW_B+ at Q0503,
U0500-4, U0950-4, U0951-4
• Check for 9.3 V at U0500-5,
U0950-5, U0951-5.
• Check for 5 V at U0503-5, 3 V
at U0962-3, 2.85 V at U0501-1,
1.85 V at U0507-1, 1.55 V at
U0502-1
• Absence of signal may indicate
failure with Q0503
• Absence of signal may indicate
failure with U0500, U0950, or
U0951 (9 V Regulators)
• Absence of signal may indicate
failure with U0503, U0962,
U0501, U0507, or U0502 (5 V,
3 V, 2.85 V, 1.85 V, and 1.55 V
Regulators)
Flex/Control Head Check for SW_B+_CH at J0401-
33,34, TP0413, or pin 21 of P502
(on control head)
Absence of signal may indicate
failure with flex, control head
SB9600 Check for logic transitions at
J0401-13 thru 16, or U0606-
4,7,9,12
Absence of signal may indicate
failure with U0606 MUX),
VR0408, VR0418, Q0610-
Q0613, U0001 (Microprocessor
Board), control-head flex, or rear
accessory flex
Radio Dead, Display
Lights Up
Clocks
Remote
Check for 32 kHz clock at
U0102-4, and 16.8 MHz clock at
C0106, C0911
Check for A+ at J6
Presence of signals may indicate
failure with U0001
(Microprocessor Board).
Absence of signals may indicate
failure with U0102 (Inverter) or
with FGU reference oscillator
circuit
Check F0400.
Check the flex.
Table 5-3. XTL 5000 Troubleshooting Table (136-174 MHz, 380-470 MHz and 450-520 MHz Mid Power)
Symptom Check Section Troubleshooting Procedure Component

Motorola ASTRO Digital XTL 5000 Specifications

General

Brand	Motorola
Model	ASTRO Digital XTL 5000
Category	Radio
Language	English