May 28, 2008
6871620L01-C
5-12
Troubleshooting Charts:
Display Failure
Display Failure–Page 3
Low-
Level Pulses
Present?
Check Active
Low Status on
RESET (J1-33)
Use an oscilloscope to check for
a low-level (0V) pulse occurrence
during power-on initialization period.
No
Yes
3
Check 60-pin Display
and Keypad Flex.
Replace if neccessary
Replace Mainboard
Summary of Contents for ASTRO XTSTM 4000
Page 1: ...COLOR CHORDS 7 ASTRO XTSTM 4000 Portable Radio Detailed Service Manual ...
Page 2: ......
Page 16: ...May 28 2008 6871620L01 C xiv Commercial Warranty Notes ...
Page 22: ...May 28 2008 6871620L01 C 1 6 Introduction Notes ...
Page 26: ...May 28 2008 6871620L01 C 2 4 Radio Power Notes ...
Page 56: ...May 28 2008 6871620L01 C 3 30 Theory of Operation Notes ...
Page 100: ...May 28 2008 6871620L01 C 6 8 Troubleshooting Waveforms Notes ...
Page 194: ...May 28 2008 6871620L01 C B 2 Motorola Service Centers Notes ...
Page 204: ...May 28 2008 6871620L01 C Glossary 10 Glossary Notes ...
Page 209: ......