29 Jun
2009
29 Jun
'09
1:52 p.m.
--- On Mon, 6/29/09, dwight elvey <dkelvey at hotmail.com> wrote:
Hi
The schematics are not real clear as to what wires
are connected to what wires from board to board.
There seems to be a separate 555 that pulses the T4 that
drives
Q3. On page 80 there is several points you might probe.
You might check the voltages and signals at Q1, E1, Q5,
E2 and Q6.
Will do.
The decaying voltage is most likely related to the
start-up +12.
It is only there for a short time to get the regulator
running.
Good point - never occurred to me. Does the startup voltage actually get suppressed once
the switchmode circuit comes up ?
Thanks for the pointers, Dwight. I'll take a look tonight when I get home.
-Dave