User Manual Part 1

TROUBLESHOOTING
70 MM101271V1 R2A
9.4.3.12 EEPROM LOAD TEST
Procedure:
Execute FactoryTest test 6, subtest 1.
Troubleshooting information:
If other I2C devices are working, then U14 is indicated.
9.4.3.13 DRAM TEST
Procedure:
Execute FactoryTest test 9.
Troubleshooting information:
Software is actually running out of DRAM. The test only checks that portion not being
used by the program. This is a test of U2 and U7.
9.4.3.14 FLASH TEST
Procedure:
Execute FactoryTest test 10.
Troubleshooting information:
Test software is stored in the Flash memory so the test only checks that portion not
holding code. This is a check of U10 and U11.
9.4.3.15 TEST SERIAL PORT QUART C
Procedure:
Connect terminal to J14C on the rear of the shelf. Set terminal for 9600 baud, N81. Type
a few characters and observe characters echoed to terminal.
Troubleshooting information:
The QUART is U28. Its four serial ports are used for BSL0, BSL1, QUART PORT C,
and QUART PORT D. If the other ports are working, the problem may be in the RS232
converter U36. RS232 level input comes on the Controller board at J7-A25, is fed to
U36-8, converted to 3.3V levels at U36-21, to the QUART U28-25. The QUART should
echo the characters out of TXC, U28-26, to U36-24, and it should appear at RS232 levels
at U36-5 and J7-A26.
9.4.3.16 TEST SERIAL PORT QUART D
Procedure:
Connect terminal to J14D on the rear of the shelf. Set terminal for 9600 baud, N81. Type
a few characters and observe characters echoed to terminal.