Motorola ASTRO Digital XTL 5000 Detailed Service Manual page 184

5-4
Table 5-2. XTL 5000 Troubleshooting Table (700–800 MHz, 380-470 MHz and 136-174 MHz) (Continued)
Symptom
No Keyloading Controller
Radio Dead, Display Blown Fuse
Does Not Light Up
Controller Section
Flex/Control Head
Radio Dead, Display Regulators
Lights Up
Flex/Control Head
SB9600
May 25, 2005
Check Section Troubleshooting Procedure
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
Check fuse in red lead of power
cable (or green lead if used)
• Check for IGNITION at J0401-
20, J0402-18, VR0402,
VR0412
• Check for A+ at Q0503,
VR0950, J0401-19,21, or
TP0414
Check for SW_B+_CH at J0401-
17, 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-
17, TP0413, or pin 21 of P502
(on control head)
Check for logic transitions at
J0401-31 thru 34, J0402-3 thru
6, or U0606-4,7,9,12
Troubleshooting Charts: Troubleshooting Tables
Component
• 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
Absence of signal may indicate
failure with J0401, J0402,
VR0412, or VR0402
• Absence of signal may indicate
failure with J0401, J0402
• Absence of signal may indicate
failure with J0950, J0401
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
6881096C74-B