Motorola ASTRO Digital XTL 5000

May 25, 2005 6881096C74-B
5-4 Troubleshooting Charts: Troubleshooting Tables
No Keyloading Controller Connect proper KVL keyloader
and cable and begin keyloading
by pressing the PTT on the
keyloader
• Check data activity (5 V levels)
on Boot_TX/Keyfail* line -
J0401-25, U0401-5, or C0430.
• Check data activity (5 V levels)
at U0401-6.
• Check data activity (5 V levels)
at J0501-14
• Absence of data may indicate
failure with keyloader, cable,
control head, control head flex,
J0401, or VR0417.
• Absence of signal may indicate
failure with U0401 (MUX) or
Q0404
• Absence of signal may indicate
failure with J0501; Presence of
signal may indicate failure of
secure interface board or UCM/
Secure module, which would
need replacing
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-
20, J0402-18, VR0402,
VR0412
• Check for A+ at Q0503,
VR0950, J0401-19,21, or
TP0414
• Absence of signal may indicate
failure with J0401, J0402
• Absence of signal may indicate
failure with J0950, J0401
Flex/Control Head Check for SW_B+_CH at J0401-
17, 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-
17, 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
J0401-31 thru 34, J0402-3 thru
6, 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
Table 5-2. XTL 5000 Troubleshooting Table (700–800 MHz, 380-470 MHz and 136-174 MHz) (Continued)
Symptom Check Section Troubleshooting Procedure Component