Page 5-30
V10/V7.5/V5/V3.5 Installation and Operation Manual
Issue 3.5
Section 5 System Level Troubleshooting
5.11 REPLACING AN IPA MODULE
Replace a defective IPA module as follows:
CAUTION
IPA modules contain solid state devices
that may be damaged by excessive heat or
high voltage transients. Ensure circuits are
not overdriven or disconnected from their
loads while turned on.
NOTE
If a spare module is available, proceed to
paragraph 5.11.1 for IPA module removal.
If one of the transmitter’s operational RF
power modules is being used, first see
paragraph 5.9.1 for RF power module
removal.
5.11.1 IPA Module Removal
Remove a defective IPA module from the
transmitter as follows:
(a) Verify the requirements of paragraph
5.11 have been completed.
(b) For V5/V3.5 transmitters only, press
RF Off
.
(c) Set the switching power supply module
that applies PA voltage to the IPA
module being removed to
STANDBY
(toggle down). The switching power
supply module’s red
DC FAIL
lamp
should be on and the IPA module’s
amber
PA VDC
lamp should be off.
(d) If necessary, remove the appropriate
module packing bracket (see Figure
2-6) to gain access to the defective IPA
module. Carefully withdraw the IPA
power module from its support tray at
the front of the transmitter cabinet.
(e) If an operational IPA module is
available, install it in the transmitter
while the defective IPA module is
being serviced (see 5.11.3). Refer to
the Repair manual to troubleshoot
and/or repair a defective IPA module.
NOTE
If an operational RF power module is
available or one has been removed from
the transmitter temporarily, it may be
installed in the transmitter while the
defective IPA module is being serviced.
See 5.9.1 for information on removing an
RF power module from the transmitter. See
5.11.2 for information on modifying an RF
power module to replace an IPA module.
5.11.2 RF Power Module
Modifications for IPA Operation
Modify an operational RF power module for
use as an IPA module as follows:
(a) On the replacement RF power module,
remove the bottom cover (covers
power module interface PWB – A5).
(b) For V10/V7.5 or dual IPA V5/V3.5
transmitters, disconnect the following
connections on the power module
interface PWB:
FLOATING CONNECTION
MATE
*
W1P1 (RF input cable – PA#1)
A5J8
*
Wire #1 (PA Volts – PA#1)
A5TB1-1
*
Wire #5 (Bias – PA#1)
A5TB2-1
*
W2P1 (RF input cable – PA#2)
A5J9
*
Wire #2 (PA Volts – PA#2)
A5TB1-3
*
Wire #6 (Bias – PA#2)
A5TB2-3
Coax cable on A5 (from A5-A/B)
A5J2
W3P1 (RF input cable – PA#3)
A5J10
W4P1 (RF input cable – PA#4)
A5J11
* Tie back cables/wires and secure
(c) Reconnect the following connections
on the power module interface PWB :
FLOATING CONNECTION
MATE
Coax cable on A5 (from A5-A/B)
A5J8
W3P1 (RF input cable – PA#3)
A5J2
W4P1 (RF input cable – PA#4)
A5J3
