Elecraft KSB2 - Manual (Page 19)

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Alignment
If your K2 serial number is 2999 or lower: Locate the PA Bias control, R60, on the K2's RF board
near the PA transformer. Set R60 fully counter-clockwise. (Newer K2s have a fixed resistor at R60.)
Locate the carrier balance control, R1 on the KSB2 module. Set it close to the center of its range.
Turn on power to the K2. Select 40 meters, LSB mode, and filter FL1. Set RF GAIN = max.
Coarse Carrier Balance Adjustment
Disconnect the microphone.
Select SSB C in the menu, and set the parameter to 2-1 (2:1 compression).
Select SSB A in the menu, and set the parameter to BAL (carrier balance). Then exit the menu. You
may see an S-meter indication, since the low-level SSB signal is now being fed back into the receiver.
Adjust R1 on the KSB2 slowly for a minimum indication on the S-meter. This should occur close to
the center of R1's range. If R1 has no effect, see Troubleshooting.
Select SSB A in the menu and set the parameter to 3. This will disable carrier balance mode.
Fine Carrier Balance Adjustment
A ham-band receiver is required to do fine carrier balance adjustment.
Use the menu to set SSB A to 3 and SSB C to 2-1 .
Connect a microphone to the K2. Select LSB mode and FL1. Set power to 5 watts.
Connect a dummy load to the K2.
Verify that pushing the PTT (push-to-talk) switch on the mic puts the K2 into transmit mode.
Press PTT, but do not talk into the mic. Locate the K2's transmitted signal on the external receiver.
The VFO setting you use on the external receiver to listen to your K2's carrier will be different from that
used to tune in the SSB voice signal. If you're tuned to a setting that allows you to hear the voice signal,
you'll be at the zero-beat frequency of the carrier and will not be able to hear a tone.
With the PTT switch pressed, adjust R1 on the SSB adapter for minimum carrier signal amplitude
using the receiver's S-meter. This should occur near the middle of R1's range (typically slightly to the
right). Repeat the adjustment using USB. Find the best compromise setting between LSB and USB.