Troubleshooting Tables; For Mid Power Models; Table 5-2. Xtl 5000 Troubleshooting Table (700-800 Mhz, 380-470 Mhz And 136-174 Mhz) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

Troubleshooting Charts: Troubleshooting Tables
5.3

Troubleshooting Tables

5.3.1

For Mid Power models

This section contains troubleshooting tables that can help you isolate a problem in your radio.
Table 5-2. XTL 5000 Troubleshooting Table (700–800 MHz, 380-470 MHz and 136-174 MHz)
Symptom
No TX Modulation Controller Block
Flex/Control Head
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, J0401-4.
• 36 mV rms at TP0201.
• 20 mV rms at U0201-1,
TP0202.
• 36 mV rms at 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
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 signal may indicate
failure with U0202 (EPOT), or
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, or VR0421
May 25, 2005
5-3