Cpu Board Tests - GE LOGIQ 180 Basic Service Manual

GE M S
EDICAL YSTEMS
D 2317229, R
IRECTION EVISION
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CPU Board Tests

When this test is select the following screen will appear.
All Tests
This option is used to run all tests in the menu. Once all the tests are completed, press any key to exit.
EPROM Checksum Test
The validity of the software residing in the EPROM on the CPU Board is tested by performing the
Checksum test. The word Checksum of the program is computed and its one's compliment is stored in
the EPROM as the last word. In this test the contents of the memory are added word wise and the
computed sum is compared against zero. If the resulting sum is non-zero the test is reported to have
failed.
Read/Write Memory Test
The Read/Write memory on the CPU Board is tested by filling the memory with test patterns and reading
them back and validating the read data. If any of the memory byte does not contain the expected data
it is declared as faulty.
Graphics Memory Test
The overlay or the graphics memory is tested in the same way as Read/Write memory.
Debug Port Test
Internal Loop Back Test - In this test the port is programmed for internal loop back mode so that a byte
transmitted can be received back.
3
CPU BOARD TESTS
1. ALL TESTS
2. EPROM CHECK SUM TEST
3. R/W MEMORY TEST
4. GRAPHICS MEMORY TEST
5. DEBUG PORT TEST
6. GRAPHICS TEST
7. NVRAM TEST
8. FLASH MEMORY TEST
P. MAIN_MENU
Q. QUIT
Figure 7-43 CPU Board Tests
Chapter 7 Diagnostics
LOGIQ™ 180 B S
ASIC ERVICE
M
ANUAL
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