[TechAssist] Re: Chipper check need schematic

Al, I don't have a print maybe you could send me one. I did some checks on
mine. Primary side looks like your 12 volt input from external power source.
This goes through a small transformer inside .The 5 volts looks like it is
developed from cr28928 through a resistor r28928 to Zener diode cr28907.
(cathode shows 5 volts).
Your zener cr28907 might be bad. If you lift that diode should see the 9
volts from cr28928..
Bruce.
I am sending this message at 3:30pm eastern time , see how long it takes to
get back to you....seems slow lately.

B&T Electronics
139 Margaret St
Sarnia Ontario
Canada
N7T 2Y3
519 344 1850

----- Original Message ----- 
From: "al m" <ampm@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, May 10, 2004 1:57 PM
Subject: [TechAssist] Re: Chipper check need schematic


> Has anyone who is having trouble looked at their chipper checker? I have
> 1.4V on the secondary side and the print says 5V. Does anyone know the
> waveform that's on the primary of the transformer. Mine seems to be
running
> but I can't get 5V out of it. Maybe someone you has one that is working
> could see if the 5V is there, Cause to disconnect on this board is gonna
be
> tough to see what's holding this down if anything.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message ----- 
> From: "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
> To: "al m" <ampm@xxxxxxx>
> Sent: Wednesday, April 28, 2004 7:24 AM
> Subject: Re: [TechAssist] Re: Chipper check need schematic
>
>
> > Hi Al,
> >
> > Sorry, I meant to respond yesterday, but I didn't have a good day :-)
> >
> > Everytihign looked so simple when I was looking at the revised
schematic.
> > Now on the original print, I see the isolated 5V schematic. U904 makes
an
> > oscillator that drives two transistors, and energizes the primary of the
> > transformer. The secondary is pretty normal.
> >
> > Sorry, I should've looked closer yesterday. I'll be back at the keyboard
> > this PM, if you have any questions.
> >
> > John
> >
> > ----- Original Message ----- 
> > From: "al m" <ampm@xxxxxxx>
> > To: "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
> > Sent: Tuesday, April 27, 2004 1:06 PM
> > Subject: Re: [TechAssist] Re: Chipper check need schematic
> >
> >
> > > John I'm talking about the 5V on the secondary side of the
transformer.
> Is
> > > that developed from the transformer? I have the 5V on the primary
side,
> > > although it's high 5.46V.
> > > Al Marquardt
> > > ampm@xxxxxxx
> > > Al Marquardt Electronic Repair
> > > 206 W Main
> > > Girardville Pa. 17935
> > > ----- Original Message ----- 
> > > From: "John @ Myers TV" <myers_tv@xxxxxxxxxxxxx>
> > > To: "al m" <ampm@xxxxxxx>
> > > Sent: Tuesday, April 27, 2004 11:56 AM
> > > Subject: Re: [TechAssist] Re: Chipper check need schematic
> > >
> > >
> > > > Hi Al,
> > > >
> > > > The 5 V doesn't come off the secondary side. It is derived directly
> from
> > > the
> > > > 12V coming into the board from the power supply. If you have no 5V,
> > check
> > > > R920 & R921. They are either 100, or 150 Ohms @ 1W.
> > > > This PDF of the schematis it about 500K. I could forward if that'd
> help.
> > > > Just let me know if your box has the revision 1.2, or not.
> > > >
> > > > John
> > > > ----- Original Message ----- 
> > > > From: "al m" <ampm@xxxxxxx>
> > > > To: <myers_tv@xxxxxxxxxxxxx>
> > > > Sent: Tuesday, April 27, 2004 9:59 AM
> > > > Subject: Re: [TechAssist] Re: Chipper check need schematic
> > > >
> > > >
> > > > > John Does it have any tips on repairing the interface box? I
opened
> > mine
> > > > up
> > > > > and there is no 5V on the transformer secondary side. Can you
> explain
> > > how
> > > > > the 5V is developed, or where it comes from. Maybe I'm missing
> > > something.
> > > > > Al Marquardt
> > > > > ampm@xxxxxxx
> > > > > Al Marquardt Electronic Repair
> > > > > 206 W Main
> > > > > Girardville Pa. 17935
> > > > > ----- Original Message ----- 
> > > > > From: "John @ Myers TV" <>
> > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > Sent: Tuesday, April 27, 2004 7:40 AM
> > > > > Subject: [TechAssist] Re: Chipper check need schematic
> > > > >
> > > > >
> > > > > > Hi guys,
> > > > > >
> > > > > > Sorry I didn't jump in with this sooner. The schematics & parts
> list
> > > fro
> > > > > > chippercheck are on the partsfinder disk. At least they were on
my
> > > March
> > > > > > 2002 disk, which is the most recent one I have.
> > > > > >
> > > > > > Go to the service information tab, then choose main contents.
This
> > > > brings
> > > > > up
> > > > > > a HTML page. The chipper check info is linked from that page.
> > > > > >
> > > > > > If anyone needs it uploaded to the members area, just let me
know.
> > > > > >
> > > > > > John Myers
> > > > > > Myers TV Service        Since 1984
> > > > > > Alliance, OH
> > > > > > ph 330-821-6545
> > > > > > ----- Original Message ----- 
> > > > > > From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
> > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > Sent: Monday, April 26, 2004 5:34 PM
> > > > > > Subject: [TechAssist] Re: Chipper check need schematic
> > > > > >
> > > > > >
> > > > > > > Al,
> > > > > > > If you get this figured out before me, please share with the
> > list..
> > > > > > > Thanks.
> > > > > > > I thought maybe I had a PC problem, since I get the same
errors
> > eve
> > > if
> > > > I
> > > > > > disconnect the printer cable.
> > > > > > > I reinstalled Windows XP last week and tried it again today,
so
> I
> > > > assume
> > > > > > the problem is with the box..
> > > > > > > Jeff
> > > > > > > --
> > > > > > > Intrepid Video TV/VCR Repair
> > > > > > > 263 S Front St, Steelton PA 17113
> > > > > > > 717-939-7708; (F) 717-564-4952
> > > > > > > www.intrepid-video.com  www.tech-repair.net
> > > > > > > ----- Original Message ----- 
> > > > > > > From: "al m" <ampm@xxxxxxx>
> > > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > > Sent: Monday, April 26, 2004 4:15 PM
> > > > > > > Subject: [TechAssist] Re: Chipper check need schematic
> > > > > > >
> > > > > > >
> > > > > > > Well after some time I still haven't figured how that 5V power
> > > supply
> > > > > > > starts. Can anyone tell me what is supposed to start the
supply?
> > > > > > >  I have no 5V supply for the micro.
> > > > > > > Al Marquardt
> > > > > > > ampm@xxxxxxx
> > > > > > > Al Marquardt Electronic Repair
> > > > > > > 206 W Main
> > > > > > > Girardville Pa. 17935
> > > > > > > ----- Original Message ----- 
> > > > > > > From: "al m" <ampm@xxxxxxx>
> > > > > > > To: <techassist@xxxxxxxxxxxxx>
> > > > > > > Sent: Sunday, April 25, 2004 1:24 PM
> > > > > > > Subject: [TechAssist] Chipper check need schematic
> > > > > > >
> > > > > > >
> > > > > > > > My chipper checker stopped working. Does anyone know where
to
> > get
> > > a
> > > > > > print
> > > > > > > of
> > > > > > > > the interface box? I opened it up and can find no 5V on the
> > EPROM.
> > > I
> > > > > > > tested
> > > > > > > > the box with the chipper checker test and it comes up cannot
> > find
> > > > > EPROM.
> > > > > > I
> > > > > > > > need to know what is holding down the 5V. there is a diode
by
> a
> > > > > > > transformer
> > > > > > > > that may be a zener but I don't want to fool around too
much.
> > > > Thanks.
> > > > > > The
> > > > > > > 5V
> > > > > > > > coming through the interconnect cord from the adapter is
there
> > > until
> > > > I
> > > > > > > > connect it to the connector on the interface, then it drops
to
> > > 1.3V.
> > > > > The
> > > > > > > box
> > > > > > > > fell off the desk and right after that stopped working. Can
> find
> > > no
> > > > > > > > cracks.Thanks.
> > > > > > > > Al Marquardt
> > > > > > > > ampm@xxxxxxx
> > > > > > > > Al Marquardt Electronic Repair
> > > > > > > > 206 WE Main
> > > > > > > > Girardville Pa. 17935
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
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