Service manual

Guide to ASTRO™ Digital Radios
Note not all command boards must be modified. Newer production boards have had
modifications/changes made at the factory. If your serial number indicates a pre-2000 radio, you must
perform all modifications. Radios made in 2000 and 2001 (A and B in 5
th
place of serial number) must
have C562 from the command board and C334 from the RF board removed. No further modifications
are required. Do a physical inspection of the command board if in doubt.
A second modification is made to the control head to disable the ignition-sense circuit. Normally
a second ignition-sense line is required to be attached to an ignition-switched power supply. This
activates the radio when you start your vehicle. However, it’s extremely annoying if you’re using this
radio in a base-station configuration or have no use for this particular feature. The ON/OFF button will
control power to the radio.
Figure 5.6 A photo illustration detailing the distal-end of a Motorola Inc. ASTRO Digital Spectra™ W5/W7 control-head.
Photographs of the W5/W7 control-heads are detailed below.W3 (Hand-held control-head)
models should work without any modifications and W9 models cannot be modified—or at least there is
no data suggesting this can be done by manipulating jumpers in the control-head.
Figure 5.7 A close-up photo illustration showing jumper configuration on a Motorola Inc. ASTRO Digital Spectra™ W5/W7 control-head, which
disables the ignition-sense circuit, and allows for ON/OFF button operation.