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TM 11-6625-3145-14
Maintenance: Troubleshooting-318/338 Service
10.
SQRAM Test
Program: SQRAM
Function:
Power on - The SQRAM is checked with the checkerboard marching pattern from 00 through FF.
Step 1. The word 55 is written into all RAM addresses.
Step 2. A word is read from a diagnostic cell and compared with the expected word 55. If the selected word is not equal
to 55, an error message is displayed and the MPU is halted.
Step 3. The word AA is written into that cell. Then a word in same cell is read back and is compared with AA. If it is not
equal to AA, 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
feature is available. The looping feature has four options; OFF, I/O, ERROR, and TEST. When the LOOP 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.
When I/O looping is selected, only those OUT instructions (subroutines) included one of the addresses listed in Table 7-21
will run. Unlesss the STOP key is pressed, the program will continue looping continuously without displaying the result of
the verification. In this case, the user should observe the ACQ. circuit board with an oscilloscope.
Table 7-21
338 SQRAM TEST PORT ADDRESSES (Hex)
Address
Content of Looping Test
5A
set CS all OFF into CS-latch to write 55 in the background of the SQRAM.
50
set 1 into QUAL (DO & D2) register and set 0 into QUAL (D1 & D3) register.
58
write 55 into the background of the SQRAM.
5B
SQRAM data is latched to read 55 from high-speed memory.
58
write AA into SQRAM after reading 55 from high-speed memory.
5B
SQRAM data is latched to read AA from high-speed memory.
When the ERROR looping function is selected, the program loops only if errors are detected. If no errors are detected the
program runs once and displays the result of the verification just as if the looping function were turned OFF. If errors are
detected, the ERROR looping function is available for the read cycle of the test. The results of the read cycle verification
will appear on the screen. Refer to the
in this manual for an explanation of error codes.
7-113
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Страница 544: ...TM 11 6625 3145 14 Figure 9 9 318 338 A11 Inverter Board component Locations ...
Страница 546: ...TM 11 6625 3145 14 Figure 9 10 318 338 A12 Regulator Board Component Locations ...
Страница 548: ...TN 11 6625 3145 14 Figure 9 11 318S1 338S1 A07 Serial RS232 Non Volatile Memory Board Component Locations ...
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