The feedback circuit that controls the tuning motors becomes sensitive
after a few months of ageing. It requires a one time adjustement to correct.
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Remove top cover and locate the antenna tuner board.
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Locate r5 and R10 and set them to the center of their range.
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Set radio as follows:
Tuner on
Frequency 14.100 MHz
Mode RTTY
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After transmit is engaged for 30 seconds,
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Adjust each control (R5 and R10) so neither motor tunes while changing
from SSB to RTTY and back to SSB.
Note:
R5 (right) controls right motor and R10 (left) controls left motor.
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Repeat this adjustment to verify proper operation and then check on
all other bands.
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Reinstall top cover and return to operation.
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