Sony SLV555UC VCR power supply dead

[Ken DelGrande]

I have a Sony SLV555UC VHS VCR that appeared completely dead today. No
display, nothing works. The primary side of the power supply (power
supply model #APS-01UC, Sony part #1-413-468-12) shows life on my DMM,
but the secondary side was almost completely shorted to ground (the lone
exception was pin #1 was at -45v). The board was nicely toasted around
a zener diode (D207), and sure enough this was shorted out. Other
components in the vicinity appear to look check out OK. Two questions:

1) does anyone out there know what the D207 zener is?

2) anyone familiar with these power supplies? Is this failure just a
symptom of something
else gone wrong?

Thanks for any help,

Ken DelGrande
ken_de...@hp.com

[Caleb Raymer]

replace all the electrolytic caps in the primary and feedback sections
except the main filter.
you will probably need to change at least one zener as well.

good luck.

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[Jerry G.]

Hi there...

I just had an SLV555 in my shop the other day with a dead
powersupply. I looked at it and saw that it would not be cost
effective to fix it. If I must spend more than about 1.5 hours on
this at my rate the labour approaches the price of a complete new
supply that I can pass on the warrenty if it quits.

I paid about $79.00 US including all taxes and delivery to me for a
complete new supply with a 90 day warrenty. I charged the customer
$99.00 for the complete job. The total work time including the phone
call was 20 minutes. He was very happy. To buy this VCR it is about
$300.00 here in Canada, so he thought it was worth it...

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Jerry Greenberg
http://www.zoom-one.com/electron.htm
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If It Works, Don't Fix It !
If It Don't Move, Slap It !
If It Don't Make Noise, Shake It !
If It's Broke, Then Fix It ... !
If You Don't Know How To Fix It, Give It Out !

============= Message Separator ================

Ken DelGrande wrote in message <36A9494F...@hp.com>...

[Ray Jennings]

D207 is a 16v. 1watt zener diode. P/N RD16F
It limits the input voltage to regulators (IC's 201&202)
It probably was taken out by a power surge, try adding a surge protector
to your AC input if you don't already have one.
IC202 should have ~13.7v @ pin 5 (input) and ~12v @ pin 3 (output).
IC201 should have ~12.3v on pin 3(output).
If not, check D202 & C203 for opens, shorts or leakage.
This part of the circuit provides switched +12v to operate motors,etc.
Good Luck
Cosmic Ray

[Ron Haholy]

You get 20.00 labor for vcr repairs WOW,,, we wont even take it in
unless we get a 35.00 est fee which of coarse is applied to the repair
if ok'd..

On Sat, 23 Jan 1999 14:00:35 -0500, "Jerry G." <jerr...@hotmail.com>
wrote: