Harris Gates Two 994 9203 002 - Page 100

Figure J-1. Controller Front Panel
U12 CD4048 HIGH power level
selection
U14* 74C193 Fine Power Up/Down
counter
U15* 74C193 Fine Power Up/Down
counter
U16* CD4048 Fine Power Upper
Limit detector
U17* CD4048 Fine Power Lower
Limit detector
U18* DA0808 Fine Power D/A
converter
U19 TLO74 Power Control
Summing Amplifier
U20* TLO74 Metering Amplifier
U21 TLO74 Metering Amplifier
U22 LM339 Overload Comparator
U23* 74C74 Sup Volt/Sup Cur Ovld
flip flop
U24* 74C74 Underdrive/VSWR
Ovld flip flop
U25 74C74 PDM Kill Timer/Auto
Cutbackflipflop
U26 MC14541 PDM Kill Timer
U27* 74C175 Overload Counter
U28* MC14541 Overload Counter
Reset Timer
U29* LM339 PDM FaultDetectorA6
U30* LM339 PDM FaultDetectorA7
U31* TLO74 PA Fuse detector
U32 MC7812 Positive 12 volt
regulator
U33 MC7912 Negative 12 volt
regulator
U38* 74C74 Fine Power Control flip
flop
U39* LM339 PDM FaultDetectorA8
U40* LM339 PDM FaultDetectorA9
* Not necessary to the operation of the trans-
mitter at any power level.
Chart of Functions
J-4 888-2314-001 Rev.AE: 03-05-2002
WARNING: Disconnect primary power prior to servicing.