Chapter 5 Troubleshooting
This chapter, along with the theory of operation in Chapter 3 and the schematics, overlays, and parts
lists in Chapter 8, will aid you in troubleshooting a malfunctioning ASTRO Digital Spectra or Digital
Spectra Plus control head. If the board is severely damaged or otherwise non-repairable, refer to the
board replacement instructions in the section, “Replacing the Control Head Board” on
page 5-7.
NOTE: To access W9 control-head boards for troubleshooting, remove them from the plastic housing
using the procedure on
page 5-10. To access W4, W5, and W7 control-head boards, use a
control-head extender cable and the procedure on
page 5-8. (Refer to the chapter,
“Recommended Test Equipment and Service Aids” on
page 4-1 for the appropriate Motorola
test equipment and service aids part numbers.)
5.1 Required Tools and Supplies
Table 5-1lists the tools and supplies needed for basic troubleshooting.
Table 5-1. Required Tools and Supplies
Tools and Supplies
Small, flat-blade screwdriver
2.5 mm hex-key driver
Torx® T8, T10, and T15 drivers
3.0 mm Allen wrench
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