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Procedure 5
Connection and Replacement Check
The system board(s) may be disconnected or damaged. Disassemble the T4700CS/T4700CT/
T4800CT following the steps described in chapter 4, Replacement Procedures, and check the
connection between upper system board and lower system board, and other components.
After checking the connection, perform the following checks.
If the IRT test (Boot mode) detects the following codes, go to Check 1.
FFH (first), 07H, 0AH, 0BH, 0DH, 15H, 18H, 1FH, 22H, 25H, 30H, 4AH, 54H,
55H, 90H, A0H, A6H
If the IRT test (Boot mode) detects the following codes, go to Check 2.
01H, 05H, 06H, 16H, 40H, 41H, 42H, 5AH, 60H, 65H, 70H, 80H
If the IRT test (Resume mode) detects the following codes, go to Check 1.
00H, F0H, F1H, F4H, F5H, F6H, F7H, F8H, F9H, FAH, FBH, FEH
If the IRT test (Resume mode) detects the following codes, go to Check 2.
F2H, FDH
If the following diagnostic test detects the error, go to Check 1.
System test
Memory test
Real Timer test
NDP test
If the following diagnostic test detects the error, go to Check 2.
Printer test
ASYNC test
Expansion test
Check 1
Replace the upper system board with a new one. If the problem still exists, replace
the lower system board with a new one. Refer to chapter 4 for instructions on
how to remove and replace the upper and lower system boards.
Check 2
Replace the lower system board with a new one. If the problem still exists, replace
replace the upper system board with a new one. Refer to chapter 4 for instruc-
tions on how to remove and replace the upper and lower system boards.
2-20
T4700CS, T4700CT, T4800CT
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