[TechAssist] Re: Mastech capacitor checker model 390-735
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 13 Dec 2003 23:32:43 -0500
When Q601 and Q602 blow, these caps (c09, c10, c11, c12) are recommended
to be replaced. These caps are part of the timing which keeps the square
wave between the two transistors symetrical. If one of the caps is off
in value, it can mess up the waveform, causing accessive current draw in
Q601 and /or Q602. Perhaps the Sony OEM replacement caps have all been
sorted to get very close tolerance in value but to buy generic caps is a
risk so I want to take all possible precautions. The Sony OEM caps are
$7.00 CDN each from our supplier here in Ontario, so if I can get 20
caps at 10 cents USD each from a US supplier and hand sort them myself,
I hope to be successful going that route. This is just an example, I'd
use the meter to check many other caps too. It's only $45.00 USD, not
like I have to spend hundreds on it.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Kevin wrote:
>
> Again I am curious: I have never had to replace these smaller caps in
> the Sony TV P/S. Why do you have to match them up?
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Gary McCartney
> Sent: Saturday, December 13, 2003 6:27 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Mastech capacitor checker model 390-735
>
> I've had a Capacitor Wizard ESR meter for about 3 years and love it- use
> it all the time. I bought the capacitor value meter because I want to be
> able to know the value of caps and to match up ones, example for the
> Sony TV power supplies where the 0.05 uF 50V jobs all need replacing. It
> is good to match up the new ones. I bought a whole bunch of them and
> will match them as I need em. I have no intention of going without my
> new meter. Might have to get an exchange or something but I'm going to
> have one.
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
> Kevin wrote:
> >
> > Just a suggestion: If you don't already own an ESR meter I would
> return
> > that cap checker to Parts Express, get my money back and buy an ESR
> > meter. 99% of the time that a cap is low in value, the ESR is bad as
> > well. The ESR meter will also show that caps that have good values,
> > have ESR values that are too high (about 25% of the time). HTH
> >
> > Kevin Wilks
> > Kevin's TV & Video Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Gary McCartney
> > Sent: Friday, December 12, 2003 6:34 AM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Mastech capacitor checker model 390-735
> >
> > Kevin, this meter is a capacitance value checker, not ESR. I played
> > around a bit more with the meter and I was able to get a capacitance
> > reading by inserting the cap into the built in socket. Even then by
> > wiggling the meter, the reading would change. I have not been able to
> > get a reading when cap is connected to the external leads (continuity
> of
> > the leads check ok). I also have not been able to get the case apart
> > yet.
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > Guelph Ontario Canada
> > Est. 1984
> > email: gary (at) number63.ca
> >
> > Kevin wrote:
> > >
> > > Just curious, does this meter measure ESR?
> > >
> > > Kevin Wilks
> > > Kevin's TV & Video Repair
> > > Penticton BC Canada
> > > kevintv@xxxxxxx
> > >
> > >
> > > -----Original Message-----
> > > From: techassist-bounce@xxxxxxxxxxxxx
> > > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Gary McCartney
> > > Sent: Thursday, December 11, 2003 10:37 AM
> > > To: techassist@xxxxxxxxxxxxx
> > > Subject: [TechAssist] Mastech capacitor checker model 390-735
> > >
> > > I just received this brand new Mastech capacitor checker model
> 390-735
> > > from Parts Express and the thing doesn't work. The display comes on
> ok
> > > but it doesn't measure any capacitors, it just stays at 000. The
> leads
> > > check ok. I removed the 2 screws from the rear bottom of the unit to
> > > remove the back cover but I can't get the cover off. It is stuck at
> > the
> > > top somehow and I'm afraid of busting the plastic if I force it too
> > > much. I'm thinking the top is likely held by catches, so if anyone
> > else
> > > has one of these meters and can advise me how to remove the back
> > cover,
> > > maybe I'll find a bad connection or some simple reason why this
> thing
> > is
> > > measuring. I hate to ship it back across the border and all. It will
> > > cost me almost as much as a new meter in shipping charges to get it
> > > back.
> > >
> > > Parts express up to date catalog, page 69.
> > >
> > > Thanks for any help.
> > > --
> > >
> > > Gary McCartney
> > >
> > > McCartney Electronics
> > > Guelph Ontario Canada
> > > Est. 1984
> > > email: gary (at) number63.ca
> > >
> > >
> >
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