TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
Table 7-18
338 CLOCK TEST PROGRAM RANGES
Gate Clock
SYSCLK
SLOW CLOCK flag
1mS
20nS
reset
50nS
reset
100uS
reset
1mS
set
200uS
reset
2mS
set
50uS
reset
5mS
set
10Ms
500uS
reset
10mS
set
8.
WORD RECOGNIZER TEST
Program: WR
Function:
Power on - The word recognition (WR) RAMs are checked with the checkerboard marching pattern from 00 through FF.
Step 1. The word 15 is written into all RAM addresses.
Step 2. A word is read from a diagnostic cell and compared with the expected word 15.
If it is not equal to 15, an error message is displayed and the MPU is halted.
Step 3. If the first test is successful, the word 2A is written into that cell. Then the word is read back out of the cell and its
value is compared with 2A. If it is not equal to 2A, an error message is displayed and the MPU is halted.
Step 4. Steps 2 and 3 are repeated for all RAM addresses.
Troubleshooting - This test is the same as that automatically run when the power is first turned on, but here the looping
test feature is available. The looping test has four options: OFF, I/O, ERROR, and TEST. When the field is set to I/O, the
looping feature allows only I/O instructions to be run repeatedly. The I/O address will appear on the screen. When the
field is set to ERROR, the looping feature allows the tests in which an error is detected to be run repeatedly. When the
field is set to
TEST, the looping feature allows one test, or sequence of tests, to be run continuously. When the field is set to OFF, the
looping feature is not available and one test, or sequence of tests, will run once.
In the I/O looping test, only one or more OUT instructions (subroutines) including one of the addresses listed in Table 7-19
will be run. Unless STOP is pressed, this test will loop continuously without displaying the result of the verification. Use an
oscilloscope to observe the word recognizers.
7-106
Summary of Contents for 318
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Page 182: ...338 VERIFICATION AND ADJUSTMENT PROCEDURES ...
Page 253: ...318 ___________________ TROUBLESHOOTING TREES ...
Page 344: ...338 TROUBLESHOOTING TREES ...
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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 ...
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Page 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
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