Specifications

APEX™ Exciter Incorporating FLO™ Technology
Exciter Troubleshooting Flow Charts Maintenance and Troubleshooting
2604s500.fm
03/08/07 888-2604-001 Page: 5-13
WARNING: Disconnect primary power prior to servicing.
Figure 5-6 Low or No Output Power Troubleshooting Flow Chart
Y
N
Low (or No) Transmitter Power Output
Y
N
N
Y
Check mute input status
to the External I/O board.
See Status > System
Control screen 2/4,
External I/O Board.
On = mute, see Note 1.
Check the wiring to the External I/O
board, J1 pin 6. This line will be pulled
low to mute the exciter.
Note 1:
Fault in exciter switcher,
interconnecting RF
cabling, or PA system,
Is the exciter RF
output power normal?
Is the exciter RF mute
active? See bottom
center of Main screen.
It will read Mute
instead of On Air.
Can exciter RF output
level be increased
using Main Screen
Power Control.
Power limit should be set
higher than the required
exciter output power? See
Setup > Exciter, screen 2/2.
Y
If power level at RF
output of exciter is still
low, call technical
support.
N
Is system in VSWR
foldback? (System
control LED on front
panel glows yellow in
foldback mode.)
Y
See Note 2
Check VSWR foldback input level at
Status > System Control screen 2/4,
External I/O board. Voltage at Analog
input 1 is the VSWR foldback input
control voltage, see transmitter speci-
fications for normal voltage range. See
Tables 3-4 for pin out of External I/O
connector.
See Setup > External I/O and make
sure the three VSWR F/B parameters
are programmed per requirements of
the transmitter system.
Check the Status > System Control
Status > Screen 2/4, External I/O
Board > Diagnostics. Analog
loopback should be disabled. and both
analog outputs A and B should be set
to zero. This will prevent a false
VSWR foldback.
Note 2:
Check Table 5-1, on page 5-10 to
ensure diagnostics settings are normal.