Harris ZX10, Technical Manual

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6-6 888-2595-001 12/20/11
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WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting
ZX Series
LOAD
OVERHEATED
alarm Amplifier chassis has shut down because one or more output assembly ballast
loads had a temperature above 125C. Suspect incorrectly connected PA
output coax cables if maintenance was just performed on transmitter. Consult
RF Interconnect Wiring Diagram in accompanying drawing package for
correct cable hookup arrangement.
If cables were not modified, allow transmitter to cool down and reapply
power, if alarm occurs instantly, suspect RF interference or other low level
circuit failure. Repeat test with RF muted. If fault occurs, proceed to remove
output assembly and troubleshoot 16X load board. Consult theory of
operation in Section 4 – Theory of Operation and apply heat to thermistors
with finger tips (body heat) to observe change in reported temperature
readings.
If problem only occurs with RF drive applied, switch transmitter off, and
inspect transmitter rear chamber for a missing RF shield cover or other
abnormality.
If problem only occurs after a long time of operation at high power, open
transmitter front door, shine light down input air plenum at far right, and
inspect output assembly fins for severe obstruction. Remove debris as
necessary.
Table 6-2 Controller Board Alarm LEDs
Symptom Cause and Solution