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eHam Forums => Mods And Repairs => Topic started by: KD5FPO on January 26, 2011, 02:40:31 PM



Title: Yaesu FT-101E regulator board repair
Post by: KD5FPO on January 26, 2011, 02:40:31 PM
I have an ft-101e with a bad 1314a regulator board, the problem is 13.6 volts in but no 6 volts out, pretty sure it's a bad MFC-6030 (Q4).  Anyone know of a good fix for this or a replacement for the outdated and discontinued mfc-6030?  Also is that component simply two transistors head to head? I can find no info. on the device.  I have two 2N9604s, would they work in place of the old component? Any help is appreciated, tnx. Michael KD5FPO@juno.com


Title: RE: Yaesu FT-101E regulator board repair
Post by: KE4DRN on January 26, 2011, 04:03:35 PM
hi Michael,

take a look at the bottom of this link

http://www.foxtango.org/ft101/foxtangoft101module.htm

Try using a modern device to replace the obsolete part

http://www.national.com/ds/LM/LM117.pdf

73 james


Title: RE: Yaesu FT-101E regulator board repair
Post by: N4ATS on January 27, 2011, 05:37:01 AM
I doubt it is bad , it is probably loaded (has a near short somewhere from another board) causing the VDC to go to 6V. I suggest touching it after it has been on a while and seeing if it gets warm.

If it is , then start removing the circuits attached to it one-by-one

Chances of that regulator going bad are null... Its current limited


Title: RE: Yaesu FT-101E regulator board repair
Post by: KE4DRN on January 30, 2011, 10:13:30 PM
hi Bill,

He posted that it is bad, the newer question has the details.

http://www.eham.net/ehamforum/smf/index.php/topic,73158.0.html

73 james