T4900CT
Procedure 5 Connection and Replacement Check
The system board(s) may be disconnected or damaged. Disassemble the T4900CT 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), 01H, 02H, 03H, 04H, 05H, 06H, 07H, 0AH, 0CH, 0DH, 18H,
1FH, 25H, 30H, 4AH, 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
the upper system board with a new one. Refer to chapter 4 for instructions on
how to remove and replace the upper and lower system boards.
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