Help with Sony SLV-R5UC capacitors

[Ron]

Can anyone tell me what caps (on what boards) other than
the infamous ones in the power supply have also had a
reputation of causing problems with this VCR?

I have looked through the SLV-R5UC archives, but haven't
been able to come up with anything specific. My R5 has
gone through the usual cycle of needing the power supply
caps, sticky lub arm, back-up cap, capstan bearing, bad
solder joints in the tuner, magenta bleed, etc, fixed.

But now, all of a sudden, normal EP mode records with
colored snow (although EP Super VHS and SP record ok),
and intermittently on playback at any speed, the picture
starts to jump, gets full of snow, and then pretty well looks
like having the TV on the wrong channel -- becoming
totally unwatchable.

After switching the R5 off and waiting for a few hours,
the picture quality (except for EP mode) is sometimes
(and sometimes not) perfect again, and may (or may not)
remain that way for several days, until the problem recurs
again. I also installed new video heads, which made no
difference.
Trouble-shooting is a bit of a headache since I don't
have a scope, so any ideas (more faulty caps?) would be
appreciated. Thanks, -Ron

 

[Cyclograph]

Can anyone tell me what caps (on what boards) other than
the infamous ones in the power supply have also had a
reputation of causing problems with this VCR?

Probably not anything to do with the troubles you are experiencing,
but thought I'd mention that the Sony PSU service kit changes the
value for three of the caps. Dunno how critical the correction is,
but thought it worth noting in case folks are just changing them out
with equivalents. What I recieved:

Kit: A-6759-574-A
cap# Orig. New
*C201 50v 120uF 50v 100uF
C202 25v 560uF 25v 560uF
*C203 25v 1500uF 35v 1200uF
C204 16v 2200uF 16v 2200uF
C205 10v 3300uF 10v 3300uF
C206 16v 470uF 16v 470uF
C207 10v 1200uF 10v 1200uF
C211 50v 0.47uF 50v 0.47uF
C214 16v 120uF 16v 120uF
C216 10v 470uF 10v 470uF
*C218 10v 120uF 16v 120uF
C219 50v 1uF 50v 1uF
C220 50v 120uF 50v 100uF

Electrolytic caps not in kit:
C105 200v 390uF
C108 250v 1uF
C213 16v 330uF
C215 16v 220uF
C217 10v 220uF

All of these should be 105'C rated... the old Elna caps originally
used apparently had design flaws that resulted in leaking, but were
also only rated for 85'C and these PSUs seem to normally run very hot.
C105 and 108 in my unit had also leaked.
-KD

 

[Ron]

Thanks for listing the cap comparison below.
Problem is, this only happened recently, long after I had
changed the power supply caps - after which everything had
worked fine. I remember reading a post some time ago where
other caps were mentioned to have caused picture problems,
but the post didn't mention any specific boards involved. -Ron

 

[Jeff]

I found bad caps on the "Selector Switch" daughter card causing video
problems with one of my R5's. I have also replaced all the electrolytics on
the Audio daughter card.

All of my euipment and service manuals are in storage right now following a
move so this is from memory. Try a Google Usenet search and see what you
come up with. I think it was discussed in one of the 2 groups you posted
to.

Good Luck,
Jeff

 

[Ron]

Looks like this is the PI-20 board according to the service manual.
I remember now reading about that somewhere. Thanks, I'll start with
those caps and see what happens. -Ron

 

[LASERandDVDfan]

I found bad caps on the "Selector Switch" daughter card causing video

problems with one of my R5's. I have also replaced all the electrolytics on
the Audio daughter card.

On the audio daughter card, I'm willing to bet that it used those metallic red
Elna "Duorex II" caps, yes? - Reinhart