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F-58 F-58
OUTPUT RECTIFIER DIODES TEST
FIGURE F.18 - SNUBBER BOARD, OUTPUT TERMINAL LOCATION
3
4
1
2
TROUBLESHOOTING & REPAIR
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.
Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.
7. After you have completed the capacitor
discharge procedure for all four switch
boards, disconnect plug J62 from the
snubber board. See Figure F.18 for loca-
tion.
8. Remove any output load that may be con-
nected to the machine.
9. With the volt/ohmmeter, measure the
resistance between the positive and neg-
ative output terminals. IMPORTANT: The
positive (+) probe must be attached to
the positive (+) output terminal and the
negative probe (-) must be attached to
the negative (-) output terminal.
10. If the reading is 40 ohms, the output recti-
fier diodes are good. If the reading is less
than 40 ohms, replace the output rectifier.
Refer to the Output Rectifier
Replacement Procedure in this section
of the manual.
11. After the test is completed and the prob-
lem successfully repaired, reconnect plug
J62 to the snubber board.
12. Install the machine case sides and top.
13. Install the handle and the lift bail rubber
gasket.
POWER WAVE 450
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WARNING
1. PC BOARD FRONT/BOTTOM COVER
2. SNUBBER PC BOARD
3. NEGATIVE OUTPUT TERMINAL
4. POSITIVE OUTPUT TERMINAL