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TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST
FIGURE F.19 – F.E.T. SWITCH BOARD LOCATION
1
1. FET OR IGBT SWITCH BOARD ASSEMBLY
TEST PROCEDURE
1. | Remove main input supply power to the | WARNING |
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| machine. | Before continuing | with the | |
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2. | With the 3/8" nut driver, remove the screws | test procedure, perform the | ||
| that hold the handle to the machine. | following capacitor | dis- | |
3. | Remove the rubber gasket (cover seal) from | charge procedure | to | avoid |
electric shock. |
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the lift bail.
4. | With the 5/16" nut driver, remove the sheet |
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| metal screws from the case top. |
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5. | With the 5/16" nut driver, remove the | 6. Obtain a high resistance and high wattage |
| screws holding the right and left case sides. | resistor (25 - 1000 ohms and 25 watts min- |
| Remove the case sides by lifting up and | imum). This resistor is not supplied with the |
| out. | machine. Secure this resistor to a piece of |
insulating material such as a glastic board. See Figure F.22. NEVER USE A SHORTING STRAP FOR THIS PROCEDURE.
