[TechAssist] Re: Mitsubishi VS5007R AND VS5017R SCHEMATICS
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 17 Aug 2003 20:29:46 -0500
Leonard, in the case of the 5007R it had been done (?) maybe
1 year or 2 ago, I found it resoldered here and there, you know,
not a very neat job, but the only problem was picture rolling vertically,
in other words, no vertical sync. I dismanteled it at the customer's
place and brought the 2 main modules to the workshop.
I left the power supply board aside because it was obvious the
problem was not there. After esr-ing all the way, found a bunch
of 10mf 50 volts dry caps and a few more, don't remember the
values now. One of them coincided with a former tip from WA6ATI , so
I felt confident and put everything together again.. SAME PROBLEM
I really feel I need the schematic, I can not go on blind testing component
after component, whitout even knowing the sinc pulses path..
The other one is a VS4517R (same as VS5017R) and it came with a
TO220 pnp transistor (the kind formerly used for vert out) and a 100 ohms
resistor burned-open (I had to guess the value) After that it comes on normally
(HV - fils OK) but with a nice black screen, nothing you do can awake the
tubes,
the voltage at the video outputs' collectors is a nice 224v all the time.
I had not paid attencion to the video and in-out board on the side but
there are
several UGLY traces of capacitors leaking hard..
To put it a little worse, I ESTIMATED LOW, which has been extremely stupid
from my part!! I had fixed several of them in the past, but it seems I 've
forgotten
to change ALL the caps and ESTIMATE HIGH.
Thank you very much for your help
best regards
Jorge
At 01:20 p.m. 17/08/03 -0400, you wrote:
>Jorge, you will need to check all five major boards carefully for leaky
>caps. Estimate high. We rebuild lots of these and almost always see over
>100 bad electrlytics on the V11 and 30 - 60 on the V12. If you don't go
>over the boards carefully and clean them up and resolder bad joints you can
>expect more problems. These manuals were never available from Mits
>electronically. Unless someone has scanned it you won't find it online. I
>have a copy on paper for both, if you need some part of it I can fax it to
>you. What kind of problems are you having? I don't have anything on the
>ctc211a.
>
>Leonard Caillouet
>Electronics World
>Gainesville, FL
>
>
>----- Original Message -----
>From: "Jorge Camboni" <geo@xxxxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Sunday, August 17, 2003 5:41 AM
>Subject: [TechAssist] Mitsubishi VS5007R AND VS5017R SCHEMATICS
>
>
> >
> > Mitsubishis VS5007R (chassis V11) and VS5017R (chassis V12)
> > ruining my life. Anybody knows a source for those service manuals
> > or just schematics ONLINE for this models/chassis?? CUSTOMERS WON'T
> > WAIT until a paper manual arrives.... (no sams, no tvdiagrams)
> > Looking for CTC211A schematics, as well..
> > TIA
> > Jorge
> >
> >
> >
> > Jorge Camboni, GY Electronics, Richardson, TX
> >
> >
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Jorge Camboni, GY Electronics, Richardson, TX
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