Table 5-3. Xtl 5000 Troubleshooting Table (136-174 Mhz, 380-470 Mhz And 450-520 Mhz Mid Power) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

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Table 5-3. XTL 5000 Troubleshooting Table (136-174 MHz, 380-470 MHz and 450-520 MHz Mid Power)

Symptom
Radio Dead, Display Blown Fuse
Does Not Light Up
Controller Section
Flex/Control Head
Radio Dead, Display Regulators
Lights Up
Flex/Control Head
SB9600
Radio Dead, Display Clocks
Lights Up
Remote
May 25, 2005
Check Section Troubleshooting Procedure
Check fuse in red lead of power
cable (or green lead if used)
• Check for IGNITION at J0401-
27, 28
• Check for A+ at Q0503,
VR0950, J0401-19,21, or
TP0414
Check for SW_B+_CH at J0401-
33,34, TP0413, or pin 21 of P502
(on control head)
• 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
Check for SW_B+_CH at J0401-
33,34, TP0413, or pin 21 of P502
(on control head)
Check for logic transitions at
J0401-13 thru 16, or U0606-
4,7,9,12
Check for 32 kHz clock at
U0102-4, and 16.8 MHz clock at
C0106, C0911
Check for A+ at J6
Troubleshooting Charts: Troubleshooting Tables
Component
Absence of signal may indicate
failure with J0401, J0402,
VR0412, or VR0402
• Absence of signal may indicate
failure with J0401
• Absence of signal may indicate
failure with J0950, J0401 or
VR0950
Absence of signal may indicate
failure with flex, control head
• 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)
Absence of signal may indicate
failure with flex, control head
Absence of signal may indicate
failure with U0606 MUX),
VR0408, VR0418, Q0610-
Q0613, U0001 (Microprocessor
Board), control-head flex, or rear
accessory flex
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.
6881096C74-B