Check
A10
by Substitution or Signal Examination
If the 4 MHz REF signal is good at the
A10
digital IF assembly, check the A10
assembly by one of the following methods:
n
Substitute another A10 assembly or
n
Check the signal/control lines required for its operation. The pins and signal
sources of those lines are identified in
‘Ihble
8-1. It is possible that the A9
assembly may not be providing the necessary signals. These signal checks
allow you to determine which assembly is faulty. Some of the waveforms are
illustrated by Figure 8-4 and Figure 8-5.
If the substitute assembly shows no improvement or if all of the input signals
are valid, continue with “Check the 4
kHz
Signal”. Otherwise troubleshoot the
suspect signal(s) or consider the A10 assembly faulty.
8-8 Receiver Troubleshooting
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