6881096C74-B May 25, 2005
Troubleshooting Charts: Troubleshooting Tables 5-7
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 Check Section Troubleshooting Procedure Component
No TX Modulation Controller Block 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
• 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
Flex/Control Head Check that MIC_HI is getting to
controller at VR0412, VR0421,
C0438, C0207, C0234, or R0204
Absence of signal may indicate
failure with flex, control head,
VR0412
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 -
J0401-44.
• Check data activity (5 V levels)
at J0501-14
• 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
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