emulatorII-list

Thanks Gregory,

I'm not sure about C121. There are a few figures on the schematic that are rather difficult to read. The capacitors I gave part numbers for are all of a higher voltage than the ones on the schematic and I used 35v ones for all the tantalums. A higher voltage capacitor is fine - this is the maximum it is rated for.

I made a few changes to the list when it came to ordering parts as a few were on back order and one was only available in huge quantities. It also looks like I have read CR111 as CR114 (another unclear bit on the schematic) - CR111 is the zener and CR114 is unpopulated. I'll prepare and upload the amended version tomorrow.

Kevin


--- In emulatorII-list@yahoogroups.com, "gregalt57" <gk.box@...> wrote:
>
> Congratulations on your working PSU and thank you very much for uploading the parts list.
> 
> Correct me if I wrong, but I think that the C121 capacitor should be 16V (not 18V) - my copy of schematics is not clear..
> I'm not really good into electronics, but is it a good idea to install a 35V capacitor where it needs 16V or 18V ?
> 
> I would appreciate any information.
> 
> Thank you,
> Best wishes,
> Gregory
> 
> --- In emulatorII-list@yahoogroups.com, "kgslug2" <kevingibson952@> wrote:
> >
> > 
> > I now have a working power supply - and some of the rectifier diodes were indeed past their best. I replaced Q103, all of the capacitors and power resistors last night, but found that the PSU still blew the fuse straight away. It would appear that some of the diodes were indeed past their best, of the four diodes on the mains input CR101 to CR104, two were closed circuit in both directions. Replacing those stopped the instant fuse blowing, but didn't give any output on J101.
> > 
> > This morning, I decided to replace the remaining transistors and the PSU now appears to be fully functional. I may still replace the diodes on the output side as the failure of CR101 to CR 104 has left me wondering how much longer they will last.
> > 
> > Some further testing on the PSU tonight, then onto the EII itself, which supposedly had a dead voice before the PSU failed.
> > 
> > Kevin
> > 
> > 
> > --- In emulatorII-list@yahoogroups.com, "kgslug2" <kevingibson952@> wrote:
> > >
> > > Thanks Darren,
> > > 
> > > 1 Ohm was what I had thought, so confirmation is good. I'm still not sure about the power rating, but I'll go with 1/2 W.
> > > 
> > > I have uploaded a list of replacement parts for everything I can find - i.e. everything except the transformers and inductors. A couple of the diodes are no longer obtainable, but there will be modern replacements. All of the electrolytics are 105C and of a higher voltage rating than the originals. All except the mains side ones are low ESR.
> > > 
> > > I haven't yet decided how much I am going to replace. I have removed all capacitors and power resistors and found the base of C115 to be decidedly bulged. The rectifier diodes are probably past there best, so I may replace those too. I'll probably leave the feedback section alone as this won't have been stressed like the rest of the circuit.
> > > 
> > > Kevin
> > > 
> > > 
> > > --- In emulatorII-list@yahoogroups.com, Darren Blondin <dblondin@> wrote:
> > > >
> > > > R106 was a component that fried on my power supply. I found this quote  
> > > > from my tech in an email about it:
> > > > 
> > > > "Your original pic of R106 confirms what I was managing to read from  
> > > > the stripes, it is 1 ohm."
> > > > 
> > > > Would be good if someone else could confirm this but I'd go with that  
> > > > for now.
> > > > 
> > > > Darren
> > > > 
> > > > 
> > > > On Nov 25, 2012, at 8:49 PM, kgslug2 wrote:
> > > > 
> > > > > Please ignore my question on THR101. I didn't think that the  
> > > > > schematic gave any value for it but it does - it is a SG220  
> > > > > thermistor.
> > > > >
> > > > > I'd still like to know about R106 though.
> > > > >
> > > > > Once I've finished compiling it, I'll put a list of the replacement  
> > > > > capacitors and various other parts in the files section.
> > > > >
> > > > > Kevin
> > > > >
> > > > >
> > > >
> > >
> >
>