Component Test Procedures 2-13
3. Visually inspect the pre-charging resistors. If the pre-charging resistors
are damaged:
A. Replace all Rectifying modules (See Removing the W Phase
(Right-Side) Rectifying Board, Rectifying Module and Output
Power Module on page 3-36).
B. Check the capacitors, rectifier(s) and external connections for
short-circuits. (See Checking the DC Bus Capacitors on page 2-17
)
C. Check the Output Power modules (See Conducting Forward
and Reverse Biased Diode Tests for Major Power Components on
page 2-4).
4. Verify that the plugs on the cable that connects X13 on the Rectifying
board to X2 on the ASIC board are properly seated.
5. Verify that the jumper at X50 on the Rectifying board is in place.
Taking Measurements on Rectifying Module
6. Disconnect connectors X13, X12, X11 and X10.
7. Perform resistance measurements, using a digital multimeter, on the
points listed in Table 2.E
below. These points are on the back of the X10,
X11 and X12 plugs which you have disconnected from the board. If the
Rectifying Module fails any of these tests, replace it (See Removing
the W Phase (Right-Side) Rectifying Board, Rectifying Module and
Output Power Module on page 3-36).
Table 2.E Rectifying Module Resistance Measurements
8. Without applying power to X13 verify that there is no resistance between
the following points: J3 and X9, J7 and X9, and J11 and X9. Refer to
Table 2.G on page 2-16
. If the Rectifying Module fails any of these
tests, replace it (See Removing the W Phase (Right-Side) Rectifying
Board, Rectifying Module and Output Power Module on page 3-36).
Important: Power supply polarity is critical during these tests. Reversing
the polarity will damage components on the circuit board.
9. Connect the DC Test Power Supply to X13 (positive to pin 5 and
common to pin 1). Raise the output of the DC Test Power Supply to 24V
dc.
Measurement points Resistance
X10: red to X10: black
18:r:X11: red to X11: black
X12: red to X12: black
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