12/20/11
888-2595-001
6-11
WARNING: Disconnect primary power prior to servicing.
Section 6 Troubleshooting
ZX Series
Power has dropped to
0% but all PS modules
appear to be on (PA/
(PS) ON lit)
Possible shut down of both halves of IPA. Inspect IPA status LEDs though
IPA heatsink fins to determine status. Consult component locator sticker to
right of controller board (reverse side of front door) for aid in locating IPA
status LEDs. If IPA module shut down has occurred, note any red alarm
LEDs behind module and proceed to troubleshoot problem in same way as
any other PA module.
Possible exciter failure. Verify exciter is powered up and is producing
output power. Verify exciter is not being muted by transmitter (see RF
MUTE ACTIVE entry) of has internal alarm. Consult exciter manual for
information on troubleshooting problem in exciter.
Individual or total PA
current reading(s) on
front panel meter
significantly higher or
lower than factory test
data report
Possible misalignment of power meter calibration. PA current readings (PA
AMPS) do not require calibration and therefore are much less likely to
present an incorrect picture of how hard transmitter is currently working. If
PA VOLTS reading still matches factory test report, then PA AMPS reading
should be very close also. If readings are significantly different, consult
Section 5 - Maintenance for power meter calibration procedure.
Individual PA current
reading of from panel
meter vary
significantly (> +/-
1A)
If a single PA has a current level approximately ½ as great as other PA
modules, suspect one half of module is either dead or receiving no drive
power. Swap PA module with PA module from adjacent slot. If problem
follows PA module to new slot, replace PA module. If problem remains in
same slot, switch off transmitter, open rear door, and swap SMA drive coax
cable(s) from affected PA backplane with those from an adjacent backplane,
ensuring to only swap yellow-labeled cables with other yellow-labeled
cables and white-labeled cables with other white-labeled cables. Switch on
transmitter and see if problem remains with original PA backplane or follows
cable(s) to new backplane. Replace PA backplane or replace SMA coax
cable(s) as necessary.
If PA modules 1-4 have significantly different current levels than PA
modules 5-8, suspect a problem with IPA module or RF splitters. Swap IPA
module with any other PA module and repeat measurement to see if balance
has improved. If problem not resolved, switch off transmitter, open rear
door, and inspect RF splitters (right wall) and/or IPA backplane and
associated cables for obvious signs of damage. Replace faulty components,
as necessary.
If problem surfaces after replacement of a PA module, verify part number of
replacement PA module matches original module. Although transmitter can
accept both class C (original Z) and class AB (“IBOC”) PA modules (…with
change of certain jumper settings), it cannot do so simultaneously. That is, it
is not possible to “mix” module types. Modules must be all of one type or
the other.
Table 6-4 Power Control and Metering
Symptom
Cause and Solution
Summary of Contents for ZX10
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