LOCATION
COMPONENT
FUNCTION/DESCRIPTION
C1
DS1
When illuminated, indicates a Cable Interlock Error, (1 thru 8), PA OFF, Blown Fuse.
C1
Fuse F1
+5 volt supply fuse.
B1-B8
P1 thru P8
Used for FlexPatch™ and troubleshooting.
C6
P9
Used for troubleshooting to patch Single RF Amp Momentary Test signal (from switch
S2) to RF amplifier on/off control inputs.
C8
P10 thru P12
Used with P15 during normal operation.
B8
P15
“CLIP” patch; connect a patch cable from P15 to the first unused modulator line to acti-
vate the “Clip” circuit. Normal operation jumpered to either P10, P11, or P12 depend-
ing upon which transmitter board is in.
C6
S2
Used with P9, to momentarily turn on an RF amplifier during troubleshooting or mainte-
nance.
Table L-1. Modulation Encoder, Controls & Indicators
LOCATION
COMPONENT
FUNCTION/DESCRIPTION
A1
TP1
Test Point for Modulated B- voltage.
C1
TP2
Test Point for +5 Volt regulator output.
C2
TP3
Test point for DATA STROBE logic signal (logic HIGH pulses)
D1
TP4
Test point for PA TURN-OFF Signal (LOW when Data Clear signal is present).
D3
TP5
Test point for CLIP-L signal.
D2
TP6
Test point for “Cable Interlock-H” logic signal (logic HIGH if a cable interlock fault ex-
ists).
C2
TP7
Test point for “PA Turn Off -H” signal from LED board (logic HIGH if fault and over-
load circuit is generating a PA turn-off signal).
C2
TP8
Test point for “PA Turn Off -L” signal from Output Monitor (logic LOW when VSWR
is above the VSWR detection threshold.
C6
TP9
Test point for +22 Volts
B7
TP10
Ground
B5
TP11
Ground
B3
TP12
Ground
B1
TP13
Ground
D5
TP14
Ground
B1
TP15
Test point for B+ voltage
Table L-2. Modulation Encoder, Test Points
Section L - Modulation Encoder (A37)
Rev. T2: 06-27-97
888-2297-002
L-9
WARNING: Disconnect primary power prior to servicing.
