13 Feb
2014
13 Feb
'14
4:51 p.m.
well, you dont have to wonder. it is from around 1982, and it has a
switching power supply. only originally not with a switching mosfet.
still stands the question what type of original transistor was in there...
On 13-02-14 14:58, Paul Koning wrote:
On Feb 13, 2014, at 7:52 AM, allison <ajp166 at
verizon.net> wrote:
--
Met vriendelijke Groet,
Simon Claessen
drukknop.nl
On 02/13/2014 03:43 AM, Simon Claessen wrote:
I don?t know the LA12, but given its age I wonder if it has a linear rather than a
switching regulator.
paul
On 12-02-14 23:18, Tony Duell wrote:
I can say one thing for sure it was not a mosfet. Power mosfets had not
become
the vogue at the time that was built. In whuich case it's almost certainl the right
sort of part. My
experience suggests that SMPSUs fail for may more trivial reasons than
having a MOSFET fitted in palce ofr a bipolar transistor.
The mosfet runs hot, even with the original cooling, and the paper is
not advancing, so there must be something wrong somewere else in the
machine. I actually would love to find out what type of transistor was
there originally relabeled as digital part # 151278200