
B–70115EN/03
10. REPLACEMENT PROCEDURES
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3. Mount a new FET module PCB, fix it using the six screws, then
connect the cables.
When the 9–kW power supply is being used, connect the CN51
or CN52 cable to the new FET PCB securely, then temporarily
tighten all the screws so that the FET PCB is free to move. As
shown in Fig. 10.2 (m), first tighten screw a. Then, gradually
tighten screws b and c, in turn, taking two or three steps to
tighten each screw. Connect the CN71 cable securely, mount
the step–up transformer PCB, then reconnect all the other
cables.
CAUTION
1 The new PCB should be oriented such that its printed
pattern is aligned with those of the other PCBs (no problem
will result, however, if the orientation is inverted.)
2 Ensure that the green cables are connected as before.
4) Checking
1. Recheck that all removed screws and disconnected cables are
securely tightened or connected.
2. Mount the top cover of the power supply.
CAUTION
If any screws are loose, or if any cable is disconnected,
turning on the power may damage the power supply.
3. Turn on the oscillator, then adjust the power supply as described
in Section 9.1.