Page 5-12 V10/V7.5/V5/V3.5 Installation and Operation Manual
Issue 3.5 Section 5 System Level Troubleshooting
5.5.2.2 IPA Forward Low
An IPA Q3 Fwd Low (V10/V7.5), IPA Q4
Fwd Low (V10/V7.5) or IPA Fwd Low
(V5/V3.5) alarm occurs when the IPA
(specifically A3 or A4 in the V10/V7.5)
peak forward power falls below the low
IPA forward power threshold (IPA Forward
Low threshold is user definable, but is
defaulted to 135 W for FM mode). Refer to
the Status and Events Log screens for
additional alarms. Refer to those alarm’s
paragraphs to troubleshoot.
NOTE
Alarm is disabled in FM+HD or HD mode.
• If no other alarms are indicated, the
problem may be the detection circuitry
on the control/display PWB (A43).
Possible Associated Faults:
- IPA Q3 or Q4 Fwd Low (V10/V7.5)
- IPA Fwd Low (V5/V3.5)
- IPA Fail A or B
- Q3 or Q4 Latch Off (V10/V7.5)
- IPA PS Fail A or B
5.5.2.3 IPA Match
An IPA Q3 Match (V10/V7.5), IPA Q4
Match (V10/V7.5) or IPA Match (V5/V3.5)
alarm occurs when the IPA (specifically
A3 or A4 in the V10/V7.5) peak forward
power falls below the reference IPA volts
threshold (IPA Forward vs Volts threshold
is user definable, but is defaulted to 50%
for FM mode). This alarm will result in the
transmitter response described in 5.5.2. To
reset, press the Reset soft key in the
Status screen. Troubleshoot as follows:
NOTE
Alarm is disabled in FM+HD or HD mode.
(a) Refer to the Status and Events Log
screens for additional alarms, as an
aid in troubleshooting. Refer to the
paragraphs on those alarms for
troubleshooting information. If no
other alarms are indicated, the
problem may be the detection circuitry
on the control/display PWB (A43).
NOTE
If one of the RF power module input drive
cables has open or short circuited, the
associated switching power supply will be
inhibited due to low RF drive input level.
The associated Module Fail (A-H for V10;
A-C, E-G for V7.5; A-D for V5, A-C for
V3.5) and associated switching power
supply module PS Fail (A-H for V10; A-C,
E-G for V7.5; A-D for V5, A-C for V3.5)
alarms will be on.
• Check for loose connectors and
intermittent cables between the IPA
module output [V10/V7.5: A19 (A), or
A20 (B), if applicable] or IPA PA output
[V5/V3.5: A19A4 (A), or A19A3 (B), if
applicable] and IPA splitter assembly
(A21 or A22, as applicable) input. For
V10/V7.5, the inputs are W7 (A3) and
W8 (A4) for IPA module A, or W9 (A3)
and W10 (A4) for IPA module B, if
applicable. For V5/V3.5, the inputs are
W8 (A4) for IPA PA A, or W10 (A3) for
IPA PA B, if applicable].
• Check cables between the IPA splitter
assembly (A21 or A22, as applicable)
outputs and the applicable RF power
module’s interconnect PWB (A23 - A30
for V10, A23 - A25 and A27 - A29 for
V7.5, A23 - A26 for V5, A23 - A25 for
V3.5). These cables/connections
include V10: W11 (A) - W18 (H); V7.5:
W11 (A) - W13 (C) and W15 (E) - W17
(G); V5: W11 (A) - W14 (D); and V3.5:
W11 (A) - W13 (C).
• For V7.5/V3.5, check cables between
the IPA splitter assembly (A21 or A22,
as applicable) and the RF termination
assemblies (A47 and A48, as
applicable). These cables include W14
and W18, as applicable.
• Ensure all RF power modules are
online and installed properly.
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