"Eeyore" wrote in
message ...


robb wrote:

well i tried the light bulb load ( using a 6v lantern
flashlight
bulb) and using a lattern battery as power source.

Lucky that 6V is *just* acceptable.


hi Graham, now i have learned a wee bit

I pre-checked battery it was slightly drained and only showing
5.2 volts but still lighting the bulb ok so i thought that was
close enough otherwise i would have found something as close to
5V as i could or even put a 5V regulator on a bread board



i could not find anything warmed and the DMM milliAmp meter
shows
~ 138 mA

i get ~438 mA when i disconnect the light bulb ???

You mean when you apply the battery directly to the 5V line ?


yes, that is more precise statement , i connected battery
directly to 5V line

to be clear about what i did do

First Test
- i connected the negative battery terminal of battery to the PCB
0v rail
- i connected the positive battery terminal to bulb lead (bulb in
series)
- i connected DMM mA meter (in series) connect red lead to the
free bulb connection
- i connected the other free DMM lead of the DMM to the 5V rail
of PCB
that completed the circuit

||====================(138 mA)================.||
||=(5v)PCB(0v)==(-)Battery(+)==()Bulb()==(+)DMM mA(-)=||

No heating noticed

Second Test
i removed the bulb from the circuit (essentially bypas te bulb
and that gave a ~438 mA reading on the DMM mA meter

noticed that the IC-CPU 8051 was a little warm and no other
components or traces seemed to be seemed to be warming


and the 8051 IC is the only thing that is warmed but no nore
than
it warmed before the 32v rail mixing with the 5v

i do not know what this means , hopefully something good
robb

It means that the power consumption looks to be in the normal
range.

Replace the 5V regulator (with a known good working one or test
the one you have
but best a new one) and power the board up on AC (but with the
power peripherals
unpowered - remove the fuse suppling power to those parts).


that is what i will do next , as it seems the 30 volt or 16 v out
of rectifiers is what feeds the 5v regulator so i will need to do
something about that

thanks again for all your time and help,
robb