Re: [ATM] My Mototrak V stopped working... what will I do?

["Bob May" <bobmay@nethere.com>]

OH, Boy!  You've got troubles.  Sounds like the convertor has a
high voltage section where the voltage is built up to several
hundred volts.  Then the power is chopped into the 60Hz with the
output transistors and sent to the motor.  The one "transformer"
with only two leads on it is the clue.  This is an inductor to do
a switching mode conversion from 12V to probably arouind 300V.
You then indicated that you've got 4 transistors in the output
and this is a H bridge setup to do the wave shaping for the DC
power to the AC output.
First off, don't run the unit at 17V or it may be overdriving the
HV section and the output transistors can't handle the high
voltage.  The highest voltage a 12V battery device should have to
handle is only 14VDC.  Any more and you're out of spec for the
12V line.
Without a schematic, repairing the HV section will be a bit iffy.
You can get generic schematics from the web by looking at the
data sheets for the parts.  There are two ICs that you will need
to have the data sheet for, the first is the controller for the
HV section and this may be anything from an 8 pin chip to
something with more pins.  The other chip I've usually seen as a
16 pin chip that drives the H bridge to produce the output
signal.  Most of the manufacturers of these type of devices do a
fair job of following the data sheet stuff, mostly because the
chips are not going to work for anything else other than their
intended function.
Good luck and get a tech that knows the stuff in there before
anything more goes bad.
Bob May
bobmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net
Replace the obvious words with the proper character.

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