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TROUBLESHOOTING AND REPAIR
SPI CABLE RESISTANCE AND VOLTAGE TEST (continued)
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TEST PROCEDURE
1.Remove the input power to the
2.Using the 5/16” nut driver, remove the case wraparound cover.
3.Perform the Capacitor Discharge Procedure.
4.Perform the Display Board Removal Procedure. Do not remove the SPI ribbon cable connecting the display board to the remote/status boards.
5.Locate and remove plug J3 from the control board. See Figure F.15.
6.Check the resistance and continuity of the SPI cable by testing with the ohmmeter from each pin on plug J3 to the corresponding pins on plug J34. See the Wiring Diagram.
7.The resistance reading pin to corresponding pin should be zero ohms or very low resis- tance. If the resistance reading is high or “open” check the plug connections to the SPI network PC boards. If the connections are OK and the resistance is high or “open” the SPI cable may be faulty.
8.Reconnect the plug into the control board and perform the Display Board Replacement
Procedure.
9.With plug J3 still removed from the control board, carefully apply the correct input power to
10.Turn on the machine.
11.Carefully check for the presence of +15VDC from plug J3 pin
12.Carefully check for the presence of +5VDC from plug J3 pin
13.If either of these voltages are low or not pre- sent, the control board may be faulty. Replace. Also Perform the Power Board Test.
14.Remove the input power to the
15.Replace plug J3 into the control board.
16.Replace any cable ties previously removed.
17.Replace the case
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FIGURE F.15 Plug J3
Pin 1
Pin 2
Plug J3 
J3
Pin 10
