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PROCEDURE
A. Adjust Coarse DC Balance (R226)
AP034-OM-E Rev D
1. If necessary, set the probe offset to 0.000 V by rotating the
O
knob in the CHANNEL section of the oscilloscope.
FFSET
2. Insert the two-pin shorting plug into the socket on the Logic
Board. Use the two holes closest to the probe cable
(Figure 9).
Installation Location for Shorting Strap
3. To enter the Cal Mode, push either of the two offset buttons
that protrude through holes in the Logic Board.
4. Plug the precision 50 Ÿ WHUPLQDWRU LQWR WKH '00 LQSXW 6HW
the DMM to measure DC volts.
5. Using a low capacitance screwdriver, adjust Coarse DC
Bal (R226) on the Amplifier Board for an output voltage of
0 mV ±10 mV (Figure 10).
ISSUED: January 2000
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AP033 Logic Board
Figure 9.
²
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