On Wed, 12 Dec 2007 15:42:10 -0600, jakdedert wrote:

You need to find the main power supply board, and trace forward from
where there. That board (or portion of the main circuit board where the
DC adapter connects) is where the excess voltage is regulated down to a
level that the actual circuits use.

Power supply board:
Takes input from batt. or converter
Connections:
Black wire - screws to alum. kb frame
"to HP" - 3 element, goes to speaker
"to DM" - 4 element, goes to 1684 PN1 (lg. board)
elements are labeled DG +5D AG +5A
+5D and +5A measure 5v DC to black wire
"to SW" - 8 element, goes to switch/volume board
elements are labeled E 5v B T M S E E
M measures 15v DC to black wire

The two large boards (2 x 12+ ") are labeled 1684 PN1 and 1684 PN2
with markings for the voicings, various effects.

Any help?

Thx,
P

"Well, there's two trains runnin'.
Ain't neither one goin' my way.
One run at midnight,
the other run just before day."
- from "Still A Fool", Muddy Waters, maybe 1949