Master TOC
TROUBLESHOOTING & REPAIR
INTERNAL AND AUXILIARY SUPPLY VOLTAGE TEST (continued)
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TEST PROCEDURE
1.Remove main input supply power to the machine.
2.With the 3/8" nut driver, remove the 4 screws that hold the handle to the machine.
3.Remove the rubber gasket (cover seal) from the lift bail.
4.With the 5/16" nut driver, remove the sheet metal screws from the case top.
5.With the 5/16" nut driver, remove the screws holding the right and left case sides. Remove the case sides by lifting up and out.
6.Perform the Capacitor Discharge Procedure described earlier in this section of the manual.
WARNING
Before continuing with the test procedure, per- form the capacitor discharge procedure to avoid electric shock.
WARNING
ELECTRIC SHOCK can kill.
With input power ON, there are high voltages inside the machine, including plug J30
and the protection board. Do not reach into the machine or touch any internal part of the machine while power is ON.
11.Turn input power ON. Machine output must be OFF.
12.Verify the following voltage measure- ments:
A. Protection Board:
115 VAC | Between J33 - pin 6 and J33 - |
| pin 1 (Power Wave 450 only) |
42 VAC | Between J33 - pin 3 and J33 - |
| pin 1 |
24 VAC | Between J33 - pin 4 and J33 - |
| pin 1 |
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7.After you have completed the capacitor dis- charge procedure for all four switch boards, remove the PC board cover. Use the 5/16" nut driver.
8.Remove the 5 leads ( 3 heavy and 2 small) T1, T2, T3 from main input contactor CR1. This is a safety precaution. It prevents high voltage from being put on the machine dur- ing the test. Wrap tape around the lead ends to insulate them and prevent them from touching.
9.Remove plug J30 from the protection board. See Figure F.1 for location of the board and plug J30.
10.Make sure that none of the pins are loose or open on the following molex plugs: J33, J34, J35, J37, J38 (on the protection board), J12, J13, J16 (on the display board), J22 (on the control board), J42, J43, and J44 (on the power board). See the Internal Auxiliary Supply Wiring Diagram, Figure F.34.
If any of these voltages are not present on the protection board, and the Auxiliary Transformer 1 Test has been completed successfully, do the following: Turn the power switch SW1 OFF and disconnect input power to the machine. Check the pins of plug J33 to be sure they are
not loose or broken. Since Auxiliary Transformer 1 Test determined that voltages are present at plug J33, the fault must be that these signals are not getting to header J33.
B. Protection Board:
115 VAC | Between J34 - pin 1 and J34 - |
| pin 5 (Power Wave 450 only) |
42 VAC | Between J34 - pin 3 and J34 - |
| pin 5 |
24 VAC | Between J34 - pin 4 and J34 - |
| pin 5 |
If any of these voltages are not present on the protection board (and the voltages in part A, above, were present, replace the protection board.
