For High Power Models And Uhf R2 Mid Power - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

Troubleshooting Charts: Troubleshooting Tables
5.3.2

For High Power models and UHF R2 Mid Power

This section contains troubleshooting tables that can help you isolate a problem in your radio.
Table 5-3. XTL 5000 Troubleshooting Table (136-174 MHz, 380-470 MHz and 450-520 MHz Mid Power)
Symptom
No TX Modulation Controller Block
Flex/Control Head
No Keyloading Controller
6881096C74-B
Check Section Troubleshooting Procedure
With 80 mV rms, 1 kHz injected
to the MIC_HI line and CPS mic
gain level set to 0 (default),
check the following levels.
• 80 mVrms at TP0200, U0209-
4, J0401-57.
• 80 mV rms at TP0201.
• 2.5 Vdc at U0201-8.
• 80 mV rms at U0201-7,
U0201-7, TP0203.
• 36 mV rms at U0200-17.
• > 150 mV rms at U0900-1.
• > 150 mV rms at FL0900-5.
• > 150 mV rms at U0902-14
• > 150 mV rms at R6782
Check that MIC_HI is getting to
controller at VR0412, VR0421,
C0438, C0207, C0234, or R0204
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 -
J0401-44.
• Check data activity (5 V levels)
at J0501-14
Component
• Absence of signal may indicate
failure with U0209 (MUX), or
U0201 (Op-Amp)
• Absence of signal may indicate
failure with U0209 (MUX), or
U0201 (Op-Amp)
• Absence of DC bias may
indicate failure with U0201
(Op-Amp)
• Absence of signal may indicate
failure with U0202 (EPOT), or
U0201 (Op-Amp)
• Absence of signal may indicate
failure with U0200 (Codec)
• Absence of signal may indicate
failure with U0901 (Urchin),
U0900 (Modulation DAC), or
U0001 (Microprocessor Board)
• Absence of signal may indicate
failure with U0901 (Urchin), or
FL0900 (Filter)
• Absence of signal may indicate
failure with U0902 (MUX)
• Presence of signal may
indicate a aproblem in RF
section
Absence of signal may indicate
failure with flex, control head,
VR0412
• Absence of data may indicate
failure with keyloader, cable,
control head, control head flex,
J0401.
• 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
May 25, 2005
5-7