TM 5-3810-306-34
TABLE 3-1. DIRECT AND GENERAL SUPPORT TROUBLESHOOTING (CONTD)
Malfunction
Test or Inspection
Corrective Action
87.
ERROR IN DATA OR NO DATA TRANSFER BETWEEN CENTRAL PROCESSING UNIT AND CONSOLE (ERROR CODES
E91, E92, E93 OR E94)
Step 1. Check that Data EPROM is plugged into CPU main board socket D5 and System EPROM is plugged into CPU
main board socket D4. Ensure that notch on EPROMs match notch on sockets. (Refer to page 3-85.) If OK go to
Step 2.
a.
Position and insert EPROMs correctly.
Step 2. Check voltage supply for console between Pin 33 and Pin 30 on CPU terminal board, terminal block XI. (Refer to
page 3-86.) Reading should be 24
Vdc. If OK go to
Step 3.
a.
Check crane electric system. (Refer to TM 5-3810-306- 20.) Repair as n ecessary.
Step 3. Check that CPU external and internal power supply is correct. (Refer to Malfunction No. 83.) If OK go to Step 4.
a.
Step 4. Check power supply to console between terminal No. 2 and terminal No. 1 on console board. (Refer to page 3-
88.) Reading should be: 24
Vdc. If OK go to
Step 5.
a.
Replace defective cable between CPU and console.
Step 5. Ensure that wires are properly connected between CPU terminal board, terminal block X1, Pin 31 and Console
terminal Pin 4 and between CPU terminal board, terminal block X1, Pin 32 and Console terminal Pin 3. If OK go
to Step 6.
a.
Connect wires properly (position, clean, tight, etc.).
Step 6. Defective Central Processor Unit and/or Console.
a.
b.
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