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FIGURE F.2 – LEFT SIDE
SWITCH BOARD TEST PROCEDURE (CONTINUED)
PROCEDURE
1. Disconnect the input power to the POWER
WAVE 655/R.
2. Remove the case sides.
3. Perform the Capacitor Discharge Procedure.
4 Using the volt-ohmmeter, perform the resistance
tests detailed in Table F.1. The readings should
all be similar. One or more readings that vary
considerably will usually indicate a defective
board. Refer to Figures F.2 and F.3 for the test
points
5. If any test fails replace the Switch Board. See
Switch Board Removal and Replacement.
NOTE: Switch boards should have Identical
base numbers and dash numbers.
6. If the switch board resistance tests are OK,
check the molex pin connections and associat-
ed wiring from the switch boards to the control
board. See the Wiring Diagram.
TROUBLESHOOTING & REPAIR
F-14 F-14
POWER WAVE 655/R
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NOTE: Resistance checks of the Switch Boards in this machine will vary greatly depending on
the type and model of meter being used. Comparative readings between the two sides
of a board and/or between the two Switch Boards will be more meaningful than the actu-
al numbers. In all cases, readings of all sets of test points should be approximately the
same. If not using an ʻauto-rangingʼ meter, select the X1000 scale.
The readings in Table F.1 are representative of the meters available when this test was
developed.