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TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
When ERROR is selected in the looping test field, looping is available only if errors are detected. If no errors are detected,
the test runs to completion just as if the looping function had been set to OFF. If some errors are detected, the ERROR
looping feature is available for the read cycle of the test, and the result of the verification will appear on the screen. Refer
to Appendix B of this manual for an explanation of error codes.
Description: Refer to Figure 7-8. The test data for ACQ Memories U1 16 to U122 <8> (256-word X 4-bit RAM,
HM10422) on the A04 ACQ Memory board are generated by U124 and U126 <2> (4-bit
binary
counter, F10016) on the A01
INPUT-A board, and U230 and U232 <3> (F10016) on the A02 INPUT-B board, instead of using the M218’s actual data.
The operation for generating this pseudo data is the same as the one used in the WR Test.
Each output of both the M218s and the F10016s respectively are connected together and are delivered to U122 and U128
(hex D master-slave flip-flop, 10176) on the A01 board, and U228 and U234 (10176) on the A02 board (these flip-flops are
used for delay). The outputs of the flip-flops are connected to each input of the ACQ memories on the A04 board through
the A08 Mother board.
The addresses for the ACQ Memories are selected by U136 and U138 (4-bit binary counter, F10016) on the A04 board.
These counters are set to COUNT ENABLE by U156 (quad 2-input NOR gate, 10102) on the A03 ACQ Control board, and
are reset by RESET from U112 (10162) on the A03 board.
At least one pair of the ACQ Memories can be enabled by U114 (hex D master-slave flip-flop, 10176) on the A04 board,
when the MPU writes the data into it at I/O address 5A
hex
by WRITE BS from U112 (10162) on the A03 board.
The flip-flop U148A <7> (dual D master-slave flip-flop, 10231) sets the STOP condition, and is re-set by RESET from
U110 (10162) on the A03 board. It also frees the WE line. START2, also from U110 (10162), enables the Strobe
Generator circuit by setting the flip-flop U124B (dual D master-slave flip-flop, 10131) on the A03 board.
After the above setup is complete, the MPU selects the internal CLK and sets the timebase U140 (timebase,
µ
PB3Z199R)
on the A04 board to generate a single clock pulse when the MPU writes to I/O address 4A
hex
. Then the MPU unmasks the
carry interrupt from both U136 and U138 (F10016) on the A04 board.
The MPU starts the test by performing steps 1 through 4 described in the Power On paragraph at the beginning of this
section.
7-18
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 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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