HP-1144A HELP!

[John Farrington]

At 09:25 PM 08/10/1999 -0400, you wrote:
>My P/S for my SB-104A has problems. Blew the 20A F2 during a QSO this
>morning.
>Have the -A series manual for the P/S, but no schematic. Problem is that
>I have lost regulated 13.8V output. Voltage Adjust pot now ineffective.
>Vout varies erratically from abt. 11.5 to 14.5 with pot on munimum.
>Manual recommends that Q1, Q1, D1, R3 or U1 may be faulty. Some time ago
>(receipt on hand), a former owner bought new Q1 and Q2 - 2N3771 from a
>Heath store in 1988 and that fixed it - then.