[TechAssist] Re: Chipper Check King
- From: "becyn" <becyn@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 27 Sep 2004 16:15:53 -0400
Sounds like the driver transistor is open B-E.
If you otherwise have pulses there in the base circuit, your golden!
Jim McVey
McVey Alltronix
327 Broadway
Newburgh N.Y. 12550
Factory authorized
service for over 20
major brands.
845 561 8383
----- Original Message -----
From: "al m" <ampm@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, September 27, 2004 2:49 PM
Subject: [TechAssist] Re: Chipper Check King
> Thanks Jim. I have 2.1VDC on the base of Q28902 where you have .4 and 6V
P-P
> on the base where you have .9V. so it looks like the IC may be bad.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, September 25, 2004 11:46 AM
> Subject: [TechAssist] Re: Chipper Check King
>
>
> > From my working unit:
> > Base of the primary side transistor labeled Q28902......0.4VDC and about
> > .9VP-P 22KHZ Sq wave, collector of same is 12.5VDC and 37.6VP-P 22KHZ.
> > Ref to CR28904 anode. Scope across the secondary of the transformer
> > there is 39.9VP-P the portion of the waveform that is above ground
> > reference is 10V peak and would be a square wave if you disregard the
> > negative going portion which is a 30V spike. Cathode of CR28906 is
> > 8.9VDC, cathode of zener CR28907 is 4.9VDC.
> >
****************************************************************************
***************************************
> > Since 1972
> > Jim Myers
> > Telrad Electronics
> > Fort Wayne, Indiana
> >
> > al m wrote:
> >> everything on the secondary supply was changed and I disconnected the
> >> rest
> >> of the circuit. The Amplitude of the pulses is what I don't know if
it's
> >> right. I gotta feeling the amplitude isn't right but how can I tell?
> >> Al Marquardt
> >> ampm@xxxxxxx
> >> Al Marquardt Electronic Repair
> >> 206 W Main
> >> Girardville Pa. 17935
> >> ----- Original Message -----
> >> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> >> To: <techassist@xxxxxxxxxxxxx>
> >> Sent: Friday, September 24, 2004 2:07 PM
> >> Subject: [TechAssist] Re: Chipper Check King
> >>
> >>
> >>
> >>>Looking at the schematic on the TCE web site that circuit looks so
> >>>simple Al, do you get pulses on the secondary side of the transformer?
> >>>If yes but no 5V on the rectifier diode cathode then there must be a
> >>>short to ground at the cathode or 100 ohms to ground if not direct.
>
>>>*************************************************************************
******************************************
> >>>Since 1972
> >>>Jim Myers
> >>>Telrad Electronics
> >>>Fort Wayne, Indiana
> >>>
> >>>
> >>>al m wrote:
> >>>
> >>>>Yep but I disconnected everything to the rectifier and still no 5V.
The
> >>>>pulses are on the primary and I changed the transformer. I'm stumped.
> >>>>Al Marquardt
> >>>>ampm@xxxxxxx
> >>>>Al Marquardt Electronic Repair
> >>>>206 W Main
> >>>>Girardville Pa. 17935
> >>>>----- Original Message -----
> >>>>From: "becyn" <becyn@xxxxxxxxxx>
> >>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>Sent: Friday, September 24, 2004 12:37 PM
> >>>>Subject: [TechAssist] Re: Chipper Check King
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Are you referring to the "isolation supply on the PCB?
> >>>>>If so, it's probably the output transistor on the primary.
> >>>>>check for pulses on the OTHER side of the base resistor. If they
exist,
> >>>>>the
> >>>>>output is bad(maybe open?)..
> >>>>>
> >>>>>The CC king, AKA
> >>>>>Jim McVey
> >>>>>McVey Alltronix
> >>>>>327 Broadway
> >>>>>Newburgh N.Y. 12550
> >>>>>
> >>>>>Factory authorized
> >>>>>service for over 20
> >>>>>major brands.
> >>>>>845 561 8383
> >>>>>----- Original Message -----
> >>>>>From: "al m" <ampm@xxxxxxx>
> >>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>Sent: Friday, September 24, 2004 12:25 PM
> >>>>>Subject: [TechAssist] Re: Chipper Check King
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Well King I have one that has no 5V on the secondary side of the
> >>>>>>transformer. What's the magic word to fix it. Can find nothing
shorted
> >>>>>>or
> >>>>>>wrong with any of the parts.
> >>>>>>Al Marquardt
> >>>>>>ampm@xxxxxxx
> >>>>>>Al Marquardt Electronic Repair
> >>>>>>206 W Main
> >>>>>>Girardville Pa. 17935
> >>>>>>----- Original Message -----
> >>>>>>From: "becyn" <becyn@xxxxxxxxxx>
> >>>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>>Sent: Friday, September 24, 2004 10:57 AM
> >>>>>>Subject: [TechAssist] Chipper Check King
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>Yes, It's true! I am the self proclaimed "King of chipper check
> >>>>>
> >>>>>repair.;-)
> >>>>>
> >>>>>
> >>>>>>>After someone in the shop (no one is claiming responsibility) did
god
> >>>>>>>knows what to the CC interface, I have brought it back to life. It
> >>>>>>>had
> >>>>>>>failed every diagnostic when I first discovered this sorry mess .
> >>>>>>>Now,
> >>>>>
> >>>>>not
> >>>>>
> >>>>>
> >>>>>>>only is it repaired, but it is updated to rev 1.2.
> >>>>>>>
> >>>>>>>Why am I so happy? I called RCA when the problem was first
discovered
> >>>>>
> >>>>>and
> >>>>>
> >>>>>
> >>>>>>>their advise was "buy a new one".
> >>>>>>>Well, my wallet screamed "NO WAY PAL!!!!!" so I had no choice but
to
> >>>>>
> >>>>>take
> >>>>>
> >>>>>
> >>>>>>>a deep breath and say "we're goin' in, men".
> >>>>>>>MISSION ACCOMPLISHED! I'm happy, my wallet is happy, I can now
> >>>>>
> >>>>>interface
> >>>>>
> >>>>>
> >>>>>>>with that CTC197, so the customer will be happy too.
> >>>>>>>
> >>>>>>>I learned a bit about the thing along the way as well. If anyone
has
> >>>>>
> >>>>>dead
> >>>>>
> >>>>>
> >>>>>>>or dying CC's...I'm your man...
> >>>>>>>
> >>>>>>>Jim McVey
> >>>>>>>McVey Alltronix
> >>>>>>>327 Broadway
> >>>>>>>Newburgh N.Y. 12550
> >>>>>>>
> >>>>>>>Factory authorized
> >>>>>>>service for over 20
> >>>>>>>major brands.
> >>>>>>>845 561 8383
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>
>
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> >>
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