TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
Table 7-20
338 ACQ TEST PORT ADDRESSES (Hex)
Address
Content of Looping Test
02
reset WR-address counter to count up WR-address counter to 55 to write 55 into
the background of high-speed memory.
5A
write CSO & CS1, CS2, CS3 into CS-latch to read 55 from high-speed memory.
55
write AA into high-speed memory after reading 55 from high-speed memory.
5A
write CSO & CS1, CS2, CS3 into CS-latch to read AA from high-speed memory.
55
write 55 into high-speed memory after reading AA from high-speed memory.
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 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
of this manual for an explaination of error codes.
Description: Refer to Figure 7-40. The test data for ACQ Memories U1 16 through U130 (256 word X 4-bit RAM,
HM10422) on the A04 ACQ Memory board are generated by U220 and U222 (4-bit binary counter, F10016) on the A02
Input-B board, and U100 through U110 (F10016) on the A01 In-put-A board. No acquired data is used. The operation for
generating pseudo data is the same as that used in the WR Test.
The addresses for the ACQ Memories are pointed at 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 data to it at I/O address 5A
hex
using 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 reset 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
PB3Z1 99R)
on the A04 board to generate a single clock pulse when the MPU writes to I/O address 4A
hex
. The MPU then unmasks the
carry interrupt from both U136 and U138 (F10016) on the A04 board.
The MPU starts the test according to Steps 1 to 4 already mentioned in the preceding Power on paragraph in this section.
Writing at I/O address 4A
hex
generates the internal clock from U140 (uPB3Z199R) on the A04 board. This clock is
buffered by U112D (quad 2-input NOR gate, MC1662) and is sent to U228 (dual
7-111
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 ...