TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
4434-568
Figure 7-40. 338 ACQ memory test.
3-input/3-output NOR gate, 10211 ) on the A02 board. This clock is returned to the strobe generator circuit on the A03
board.
The Strobe Generator on the A03 board delivers WE and ADRS CLK to the A04 board when the clock qualifier is set to
off.
During the read phase, the MPU gets data from U152 (octal buffer/line driver with 3-state output, 74LS 244) by issuing
READ ACQ DATA at I/O address 59
hex
. The READ ACQ DATA signal switches the inputs of U142 and U144 (quad 2-
input multiplexer, 10158) on the A04 board to the output of the ACQ Memories.
Some ACQ Memories outputs are wired together with the outputs of U146 (quad 2-input multiplexer/latch, 10173) on the
A03 board or with Threshold TEST from U252B (quad 2-input NOR gate, 10102) on the A02 board, via the A08 Mother
board. These signals should be kept low in order to read the correct data from the ACQ Memories. To write 0’s into U146
(10173) on the A03 board, the MPU loads 00 into SQRAM U144 (256 word X 4-bit RAM, HM10422) on the A03 board,
then changes the inputs of U146 (10173) to the SQRAM output and issues READ SQRAM . The output of U252B (10102)
on the A02 board can be disabled by writing X1XXXX
binary
serially into U234 (hex D master-slave flip-flop, 10176) on the
A02 board at I/O address 03
hex
.
7-112
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 ...
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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 ...