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TM 11-6625-3145-14
Theory of Operation-318/338 Service
QUALIFY LOGIC <5>
The qualify logic consists of A03U100, A03U114A, A03114B, A03U114C, A03U116A, A03U116B, A03U116C, A03U118A,
and A03U118B. The qualifier signals QA, QB, QC, and QD from the A02 INPUT B board go to gate A03U100, where they
are converted into inverting and non-inverting signals. The signals are wire-ANDed with the outputs of qualify registers
A03U106, A03U108, A03U102, and A03U104, and go to EXOR gates A03U114, A03U116, and A03U118 where their
polarities are selected according to the polarity selection bits of A03U102, A03U104, A03U106, and A03U108. Each
output of the XOR gates is wire-ANDed to form the trigger and clock qualify signals. These two signals go to gates
A03U126A and A03U126B <6> of the start logic.
START/STOP LOGIC <6>
The start/stop logic consists of A03U124B, A03U126A, and A03U126B. When the data acquisition starts, a START1
pulse is generated at I/O address 56
hex
and goes to the clock input of A03U 1 24B.
The output signal of this flip-flop enables the TRIG QUAL1 and CLOCK QUAL signals to pass through gates A03U126A
and A03U126B to the inputs of the trigger qualify and the clock qualify flip-flops.
START2 is issued at I/O address 55
hex
to get the acquired data from the ACQ memory on the A04 board. The MPU sets
the data by incrementing the address counter on the A04 board at I/O address 54
hex
.
At the end of the data acquisition, the STOP1 signal is issued by the output of the STOP flag. At the end of the read from
ACQ memory operation, MANUAL STOP is generated at I/O address 53
hex
.
TRIGGER QUALIFY FLIP-FLOP <6>
The trigger qualify flip-flop consists of A03U128A. The trigger qualify signal is clocked into the Dtype flip-flop every system
clock.
The output of the flip-flop connects to one of the retiming flip-flops through delay line A03DL106B.
RETIMING CLOCK <6>
The retiming clock circuit consists of A03U128B, A03C100, A03R136, A03DL102, A03U134B, and A03U142C <6>. The
pulse generated by A03U128B, A03C100, and A03R136, called the retiming clock genarator, goes through delay line
A03DL102 to the clock pin of A03U134B.
The pulse delay time is adjusted by selecting a tap of J200. The pulse is used as the retiming clock by which the trigger
data is latched into the retiming flip-flops.
CLOCK QUALIFY FLIP-FLOP <6> The clock qualify circuit consists of A03U130, A03DL100B, A03DL100A, A03U142D,
A03R130, and A03C1025. The pulse generated by A03U130A and A03DL100B goes through A03DL100A and A03U142D
to the clock pins of A03U130B, A03U132A, and A03U132B as the trigger pulse for the strobe generators.
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Summary of Contents for 318
Page 119: ...318 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
Page 517: ...TM 11 6625 3145 14 318 338 4434 923 318 Block Diagram ...
Page 518: ...TM 11 6625 3145 14 318 338 4434 924 338 Block Diagram ...
Page 519: ...TM 11 6625 3145 14 318 338 4434 925 318 Acquisition Module Wiring Diagram ...
Page 520: ...TM 11 6625 3145 14 318 338 4434 926 318 338 Mainframe Wiring Diagram ...
Page 521: ...TM 11 6625 3145 14 318 338 4434 926 338 Acquisition Module Wiring Diagram ...
Page 522: ...TM 11 6625 3145 14 318 338 4434 928 Figure 9 1 318 A01 Input A Board Component Locations ...
Page 526: ...TM 11 6625 3145 14 ...
Page 528: ...TM 11 6625 3145 14 Figure 9 3 318 338 A03 ACQ Control Board Component Locations ...
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Page 542: ...TM 11 6625 3145 14 Figure 9 8 318 338 A10 CRT Board Component Locations ...
Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Page 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Page 551: ...TM 11 6625 3145 14 Figure 9 12 338 A01 Input A Board Component Locations ...
Page 553: ...TM 11 6625 3145 14 318 338 SERVICE ...
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Page 555: ...PIN 058584 ...