V10/V7.5/V5/V3.5 Installation and Operation Manual
Page
5-29
Section 5 System Level Troubleshooting
Issue 3.5
5.9.2 RF Power Module Installation
Install an operational RF power module in
the transmitter as follows:
(a) Lift the operational RF power module
into the transmitter and onto its support
tray. Ensure it is placed properly on its
guide rails.
(b) A slight amount of force is all that is
required to push the RF power
module back into its on-air position.
Ensure that its interface connector
and RF output connectors engage
with their mating blind-mate
connectors at the rear of the module
(rear panel).
CAUTION
RF power modules make their dc and RF
connection through blind-mate connectors
at the rear of the module. Use caution
when returning the module into its on-air
position, making sure the module remains
seated properly in the guide rails on its
support tray. Failure to do so may result in
damage to blind-mate connectors.
(c) Set the switching power supply module
turned off in step 5.9.1 (b) that applies
PA voltage to the RF power module
replaced to
ON
(toggle up).
(d) In the
Status
screen, press the
Reset
button. Verify the
IPA/PA
lamp on the
transmitter front panel’s system
diagram turns off, and all RF power
module related faults are cleared. The
RF power module’s amber
PA VDC
lamp should be on and the transmitter
should resume operation at the desired
operating level.
5.10 IPA MODULE FAULT
ISOLATION
Determine if an IPA module (V10/V7.5) or
IPA PA (V5/V3.5) is defective, as follows:
NOTE
For single IPA module/PA transmitters, an
IPA module/PA failure may take the
transmitter ‘off-air’ [in V10/V7.5
transmitters, if only one PA (A3 or A4) fails,
the transmitter will remain ‘on-air’ at
reduced power].
For dual IPA module/PA transmitters, an
IPA module failure will result in an
automatic changeover to the reserve IPA
module/PA, allowing continued ‘on-air’
operation. For V10/V7.5 transmitters, the
failed IPA module may be removed for
repair while ‘on-air’. For V5/V3.5
transmitters, IPA module removal/repair
must be performed while ‘off-air’.
In either case, an operational RF power
module can replace a defective IPA
module, after slight modification. The RF
power module is identical to the IPA
module, except that it has fewer PAs (two
for V10/V7.5 and dual IPA V5/V3.5
transmitters and one for single IPA V5/V3.5
transmitters).
Depending on the transmitter’s
configuration mode (FM, FM+HD, HD), the
PA bias setting varies between IPA and RF
power modules. Bias control is set by the
microprocessor upon module replacement,
and therefore requires no adjustment.
(a) Verify the
IPA/PA
lamp on the front
panel’s system diagram is turned on
(red). In single IPA systems, the output
power will be reduced to zero. In dual
IPA systems, a changeover to the
standby IPA (if enabled) will occur.