F700 is the yoke protection, and it usually means your getting DC to the
yoke. It could be one of the output transistors or the MPS
U57/U07.
> Thanks Jerry,
>
> I don't think the problem is in the low voltage section (100s)
of the
> board. Something in the 700s seems to be the problem. If it were
blowing
> F100 for F101, that would be the case. It looks like I need to start
at
> P700 and work my way backwards, pins 3 and 7 control the base for
the
> deflection amplifiers so with HV disconnected, I should be able
to
> determine which of the +/- amplifiers are being activated. The +
side
> looks much simpler...
>
> Kirk S.
> ----- Original Message -----
>
From: jerry madsen
> To: vectorlist@vectorlist.org
> Sent: Wednesday, October 10, 2012 6:43 PM
> Subject: Re: VECTOR: Tempest WG6100 Blows F700
>
>
> Check the 2 biggest Capacitors on the deflection board,meter them to
see
> if you have a short on one or both,i have same problem before and
that
> was the cure,maybe that will be your problem.
> Jerry.
>
>
>
>
From: Kirk Spradling <kspradling@kc.rr.com>
> To: vectorlist@vectorlist.org
> Sent: Wednesday, October 10, 2012 4:38 PM
> Subject: VECTOR: Tempest WG6100 Blows F700
>
>
> I was experiencing random garbage on my Tempest so I pulled the
boards
> out, removed the solder from the interboard connectors and
resoldered
> them. I put the board back into the machine and F700 blows
instantly.
> I have replaced ALL Q70x series including the chassis mounted
> transistors and it still blows F700. I have disconnected the edge
> connectors from the game board and it blows F700. I connected my
Oscope
> to the game board X/Y and it displays the game and test screens
> perfectly with the same scale in X and Y. LV2000 installed years
ago.
> Transistors all test good and no shorts to chassis. First version
of
> the deflection board with no imput protection installed. Spot
killer
> lit.
>
> I'm pretty sure that it is related to the game board repair
however I am
> at a loss as to what is going on since it blows without the game
board.
>
> The 6100 Faq doesn't mention much about blowing the deflection
fuses. I
> guess I should start taking some measurements on the deflection
board
> itself to see where I am getting the full-on signal. Pull the X
> amplifier connector and check some readings. I guess I had better
look
> at the schematic again.
>
> The diodes test ok as well. Guess I will start on the resistors.
>
> Thanks in advance...
>
> Kirk S.
>
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Received on Thu Oct 11 09:43:32 2012
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