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 P1thruP8 UsedforFlexPatch™ 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 Tu rn 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.
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