Radio Shack PRO-197 Service Manual page 13

DSP Section (Boot Section)
Power ON
scanner's display freeze showing
Waiting for DSP?
Defective IC313, IC311, and/or associated
When IC311 (Flash Memory) is replaced,
a one which is loaded with the software
must be used. "APP F1.3/VOC F1.0" is
labeled on the package of IC311 if the
software is preloaded.
Note: If the software of the CPU is
updated, the software of IC311 might
need to be changed. Pay attention to the
information from the manufacturer.
Does the
YES
circuits.
NO
Does display
freeze showing DSP
Loader.... DSP Boot: FX .X
at power on?
Is voltage
okay on LC305 (3.5V),
LC303 (3.5V), LC304 (1.5V),
and IC313-Pin 29
(1.8V).
Is the
clock oscillation okay on
X302 (18.432 MHz).
Defective IC310, IC311, IC312,
R376, R385, R386, R433, R435.
R438, or other associated
components. Or, defective IC307
(CPU).
13
NO
DSP boot section
YES
NO
Defective IC309,
YES
LC303, or LC304.
NO
Defective IC310,
YES
is OK.
IC308, LC305,
X302, C395,
C396.