Mitsi HS-U71 SVHS vcr problem

K

Ken_B

Guest
(This seems to be my week for VCR problems....)

I just came home from an auction with a Mitsubishi HS-U71 SVHS VCR. It works
great with regular VHS tapes, but will not record or play back SVHS tapes.
Audio OK but garbage video. I know the VCR is properly recognizing the SVHS
tape because the SVHS light comes on. Heads look OK to me. Any advice
appreciated.

Ken
 
Most likely the heads, or the <u>playback</u> switching system. You need to go
to another SVHS and try to play what you've recorded on the defective machine
to be sure. When SVHS heads get worn they start producing black flecks in the
bright whites, but if left to go on, eventually they wind up pretty much
scrambling the video.

Even at this stage it is quite possible for it to work acceptably on a nomal
VHS tape. It's just worn, it can do 4 Mhz, but not the 7 Mhz required for SVHS.

You must do some footwork before replacing the head, from the manufacturer it's
likely to be costly. Asti might cut you a deal, but they are not perfect. I've
had good luck with them, but some others I've heard haven't. The only problem I
ever had with them was with it taking 4 months to get a flyback, the heads
always arrived quickly and worked fine.

If the heads are worn and it is recording in SVHS, a machine with good heads
should play the tape back alot better, then record a bit on the other machine
and play it back on yours. Trying to go both ways through bad heads is too
much, but one way you should be able to see something. Any other indication
probably means there is an electronic fault. Also try this in both SP and EP,
because they use different heads. If the problem is simple wear, EP should be
much worse. In either case SVHS requires a very small head gap.

JURB
 
Thanks for the advice, but what's "SMD"? I'm not a pro, just a hobbyist.

"Steven V.A." &lt;steven.vanassche@bluebottle.com&gt; wrote in message
news:eek:fj3mv4uduhn7gkb42nhnat29nffiessbl@4ax.com...
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

great with regular VHS tapes, but will not record or play back SVHS
tapes.
Audio OK but garbage video.

Also: Check for bad SMD capacitors. There might be one on a
postage-size board. If it's leaky it wil give a very disorted SVHS
playback.

All the SMD's in my '91 Mitz SVHS were leaky...

Greetings,
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com
//
Click to expand...
 
Surface Mount Device.

WT

"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote in message
news:vm4e6he3f73db9@corp.supernews.com...
Thanks for the advice, but what's "SMD"? I'm not a pro, just a hobbyist.

"Steven V.A." &lt;steven.vanassche@bluebottle.com&gt; wrote in message
news:eek:fj3mv4uduhn7gkb42nhnat29nffiessbl@4ax.com...
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

great with regular VHS tapes, but will not record or play back SVHS
tapes.
Audio OK but garbage video.

Also: Check for bad SMD capacitors. There might be one on a
postage-size board. If it's leaky it wil give a very disorted SVHS
playback.

All the SMD's in my '91 Mitz SVHS were leaky...

Greetings,
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: //
http://www.themysteriouscitiesofgold.com
//
Click to expand...
 
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

VHS tapes recorded on this machine play back on this machine, but not
SVHS...just blue screen on the TV. Sound OK.
Click to expand...
You did also change these?

http://niga.sytes.net/av/v1k_09.jpg
http://niga.sytes.net/av/v1k_10.jpg
http://niga.sytes.net/av/v1k_11.jpg

(excuse me if, you already did)

Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com //
 
No I didn't...I assume that's a cap I'm looking at. Where is that board
located?

Ken

"Steven V.A." &lt;steven.vanassche@bluebottle.com&gt; wrote in message
news:j1memv0kpb9m3foskd0vlcnjsja2tb13t0@4ax.com...
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

VHS tapes recorded on this machine play back on this machine, but not
SVHS...just blue screen on the TV. Sound OK.

You did also change these?

http://niga.sytes.net/av/v1k_09.jpg
http://niga.sytes.net/av/v1k_10.jpg
http://niga.sytes.net/av/v1k_11.jpg

(excuse me if, you already did)

Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com
//
Click to expand...
 
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

No I didn't...
I assume that's a cap I'm looking at.
Click to expand...
Yes. That are the (in)famous SMD caps.

Where is that board
located?
Click to expand...
On the main board. However, this picture is from a Mitsubishi HS-U82.
I just wanted to show how these caps looked like.


Greetz,
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com //
 
Thanks - I'll check that out.

I put in new heads, and now I can record in SVHS at either speed, but the
VCR won't play back it's recordings. Good sound but weak torn-up video.

However the picture is perfect if played on a different machine. Also tapes
from different machine look fine on this one. Weird. Sort of a
compatibility problem in reverse!

"Steven V.A." &lt;steven.vanassche@bluebottle.com&gt; wrote in message
news:5sbjmv0ibo4e4i4gl6o81899fv6s2fdm7s@4ax.com...
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

No I didn't...
I assume that's a cap I'm looking at.

Yes. That are the (in)famous SMD caps.

Where is that board
located?

On the main board. However, this picture is from a Mitsubishi HS-U82.
I just wanted to show how these caps looked like.


Greetz,
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com
//
Click to expand...
 
Lordy, I love this newsgroup! Another tip that led right to the problem. I
replaced that 4.7mf/35v cap and repaired a damaged trace, and now it's
working perfectly. Thanks a lot Steven!



"Steven V.A." &lt;steven.vanassche@bluebottle.com&gt; wrote in message
news:5sbjmv0ibo4e4i4gl6o81899fv6s2fdm7s@4ax.com...
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

No I didn't...
I assume that's a cap I'm looking at.

Yes. That are the (in)famous SMD caps.

Where is that board
located?

On the main board. However, this picture is from a Mitsubishi HS-U82.
I just wanted to show how these caps looked like.


Greetz,
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com
//
Click to expand...
 
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

Lordy, I love this newsgroup! Another tip that led right to the problem. I
replaced that 4.7mf/35v cap and repaired a damaged trace, and now it's
working perfectly. Thanks a lot Steven!
Click to expand...
Thx for letting me know!
Enjoy your Mitsubishi, it's a very fine machine...
But you probably knew that already ;-)

Greetz
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: // http://www.themysteriouscitiesofgold.com //
 
Problem solved, thanks a lot for all the replies.

"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote in message
news:vm6o92na0bfu4c@corp.supernews.com...
Aha! Thanks, I'll check those out.

Ken

"Wayne Tiffany" &lt;wayne.tiffany@asi.com&gt; wrote in message
news:bjtgpi$msn8i$1@ID-201804.news.uni-berlin.de...
Surface Mount Device.

WT

"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote in message
news:vm4e6he3f73db9@corp.supernews.com...
Thanks for the advice, but what's "SMD"? I'm not a pro, just a
hobbyist.

"Steven V.A." &lt;steven.vanassche@bluebottle.com&gt; wrote in message
news:eek:fj3mv4uduhn7gkb42nhnat29nffiessbl@4ax.com...
"Ken_B" &lt;ken5229"at"softhome.net&gt; wrote:

great with regular VHS tapes, but will not record or play back SVHS
tapes.
Audio OK but garbage video.

Also: Check for bad SMD capacitors. There might be one on a
postage-size board. If it's leaky it wil give a very disorted SVHS
playback.

All the SMD's in my '91 Mitz SVHS were leaky...

Greetings,
Steven
---
A White Sailboat...Raging Waters...A Golden Inca Temple...
And a Great Earthquake...A Giant Condor That Wheels In The Sky...
The Mysterious Cities of Gold: //
http://www.themysteriouscitiesofgold.com
//
Click to expand...
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top