[TechAssist] Re: Sony VCR, SLV555 won't power up, no display [UPDATE]
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 27 Mar 2004 01:58:31 -0500
The original messages from this thread was in January. It has taken 2
months but a very generous person has given me a scrap SLV555UC VCR
which I was able to use the front panel display board (including the
micro) to install into the machine I was working on.
This corrected the fault, so I am declaring that the micro was indeed
the problem.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Previous thread:
Kevin, thanks to your zip file, I can now say the power supply is
functioning properly. There is no 5V signal reaching the power supply to
turn on the regulators. I inserted my own external 5V supply and the
regulators turned on and all the output voltages are present. The front
panel LED's and digital display lights up but there is no VCR action at
all. I suspect the micro, which is located on the front panel display
board.
Does anyone have a junker machine with a usable front panel circuit
board (the board with the digital display on it)? The display doesn't
have to be good or even there because I can use the display I have here.
Number on this board is: 1-631-340-13. Please email me privately with
price.
Thank you.
Kevin Gunn wrote:
>
> Gary I sent you the ZIP file. Hope it helps.
>
> Kevin Gunn
> Star Tek Electronic Services
> 390 Springbank Drive
> London, Ontario
> www.ulurn.com/startek
>
> N6J 1G9 519-473-6366
> ----- Original Message -----
> From: "Gary McCartney" <gary@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, January 13, 2004 4:39 PM
> Subject: [TechAssist] Sony VCR, SLV555 won't power up, no display
>
> > I have this Sony VCR, model SLV555 which will not power up and the front
> > panel display is not lit either.
> >
> > I found a 1500uF, 25V cap in the power supply that was leaky. Replaced
> > that and a few others with high ESR. Also checked the diodes and made
> > sure that D207 has 16V on the cathode. The ON/OFF pin 2 on the 3 voltage
> > regulators (3120C, 3120C and 3050C) are at 0.8V all the time, even when
> > I push the power button.
> >
> > Does anyone have a list of the proper voltages on the power supply
> > connector pins and the source from which the regulator ON/OFF pin gets a
> > HI signal for power?
> >
> > Power supply is model APS-01UC, Sony part number 1-413-468-13
> >
> >
> > Thanks for any help.
> > --
> >
> >
> >
> >
> > Gary McCartney
> >
> > McCartney Electronics
> > Guelph Ontario Canada
> > Est. 1984
> > email: gary (at) number63.ca
> >
> > --------------------------------------------------------------------------
> ---
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