SGC MAC-200 guru?

[bbo14]

I have an SGC MAC-200 that is not performing properly. It is stuck on ANTENNA 3. It won't go into AUTO mode. I can change power levels from 20 WATTS to 200 WATTS. The buttons associated with the non-working functions do perform their alternate functions, so I know the buttons are working. I have the manual. Anyone out there have experience fixing these? I'm open to suggestions.

 

[bbo14]

Resolution of the problem. Replaced the resistor and the regulator. Checked the tuner with 10 watts in. Tunes properly into a 16.667 ohm load (three 50 ohm dummy loads all tied together with PL259 TEE connectors). Tunes in about 3-5 seconds first try on all bands from 80 thru 10, including WARC bands. Remembers tuned settings when coming back to the same frequency after tuning up on another frequency in the same band. It was even able to tune it to 2:1 on 160 meters even though it wasn't designed for 160. Problem solved. Now to put it to work. It's been on the Injured Reserve list too long.