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F-32 F-32
TROUBLESHOOTING & REPAIR
STT CHOPPER BOARD TEST (CONTINUED)
4.Carefully apply input power to the Power Wave 455/R.
WARNING
ELECTRIC SHOCK can kill.
High voltage is present when input power is applied to the machine.
For steps 5 and 6, see Figure F.10.
5.Turn on the Power Wave 455/R. Measure the voltage from Power Board plug J43 lead 345 pin 7 (+) to lead 346 pin 1
6.Measure the voltage from Control Board plug J7 lead 4W pin 13
(+). The voltage should be 4 – 5 VDC. This is the pulse width modulation signal to the STT Chopper Board. If not correct, the Control Board may be faulty.
7.When the test is completed, remove input power from the Power Wave 455/R.
8.Install the case top using the 3/8” nut driver.
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