21 Jul
2002
21 Jul
'02
6:48 p.m.
On Mon, 22 Jul 2002 jpero(a)sympatico.ca wrote:
Would that happen even if the load solenoid is stuck, and the servo can't
move?
I checked the
voltage again, with the servo plug disconnected, and got
just under 12VDC across the terminals. With the servo plug connected, it
reads right at 0.4VDC.
That means poor power drive to kick in that servo. Voltage should go up
to ~12V or then settle down to holding voltages like 6V or so depending
on that design. In all TV sets that uses power relay to turn on set
using standby power
it's always either 12V or 24V across coil when on. On one set, I had
diode go leaky across that coil. That one I could push down on that
relay and it will stay shut and tv come up. (too weak for initial pull
in.)
This board uses 2 MJE200 transistors, 2 MJE210 transistors, and 4 1N4001
diodes that appear to form some sort of H-bridge.
-Toth