8th May 2010, 4:58 pm | #441 |
Dekatron
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,422
|
Re: Pye v4
1N4007's although a little slow will actually work on 405 although the lock wont be quite as good as 1N4148's, give them a try you've nothing to loose.
__________________
Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member |
8th May 2010, 5:04 pm | #442 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
Ok I have ordered IN4148's and can put them in next week.
The IN4007's have a silver band on one end, the original M3's have a sealed metal end and what looks like a paxolin end. Which end of the IN4007 matches the M3 end |
8th May 2010, 5:12 pm | #443 |
Dekatron
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,422
|
Re: Pye v4
OK Easy way is to work it out from the circuit! The silver band (cathode) is the thick black solid end on the diode in the diagram not the triangular shaped part.
__________________
Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member |
8th May 2010, 5:14 pm | #444 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
Scratch that I just found some IN4148 diodes Woo Hoo.
|
8th May 2010, 5:17 pm | #445 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
The In4148's have a black band at one end and the rest of the body is copper sort of colour, same principle I take it the band is the solid line
|
8th May 2010, 5:22 pm | #446 |
Dekatron
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,422
|
Re: Pye v4
elementary stuff my dear Watson!
__________________
Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member |
8th May 2010, 5:30 pm | #447 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
Ok I can't do this from the schematic. Each diode has a .001 cap and each diode has a 100K resistor. I need it simplified the pax end equates to, then I'm away.
I can wire the diodes together correctly but putting them in circuit is a 50 50 chance of round the wrong way |
8th May 2010, 5:38 pm | #448 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
Is this it, I think it is, just need confirmation.
Last edited by oldticktock; 8th May 2010 at 5:51 pm. |
8th May 2010, 6:40 pm | #449 |
Dekatron
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,422
|
Re: Pye v4
The anode of the original diode (M3) is connected to the metal part.
These diodes dont read on the diode test of a digital meter as they are high impedance.
__________________
Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member |
8th May 2010, 6:54 pm | #450 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
Ok going to wire in I hope this cleans up the picture
|
8th May 2010, 7:17 pm | #451 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
Diodes in and its sort of better.
First pic is what happens if i use the large tuning wheel and go off test tone and get humm picture gets better. Second picture is if I tune in test tone loud and clear, picture goes pants |
8th May 2010, 7:23 pm | #452 |
Dekatron
Join Date: Feb 2005
Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW
Posts: 3,518
|
Re: Pye v4
you arent far away now - looks like a lot of overloading now!
Excellent results, and I admire your tenacity! Sean
__________________
Engineers make things work and have spare bits when finished |
8th May 2010, 7:27 pm | #453 |
Dekatron
Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,422
|
Re: Pye v4
You still have issues with the front end, wether its AGC, video or the IF strip I can't in all honesty say. The sync is also weak but that could be to do with the former. Without having the set on my bench and proper test equipment I feel I must now stop, at this point I cannot go any further. You could of course check your work for incorrect placement or values of components.
Why don't you take the set to an engineer that has a little spare time to give you some hands on experience? My other problem is I have spent so much time here during my weeks holiday that I must spend some time with the missus before returning to work on Monday. good luck PS did you set up the line osc like I told you to do?
__________________
Cheers, Trevor. MM0KJJ. RSGB, GQRP, WACRAL, K&LARC. Member |
8th May 2010, 7:32 pm | #454 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
After what sean said, i put in a 12dB atten, helped quite a bit, still issues right side cut off, contrast either cuts picture out or seems to not do a lot. If you have the controls in other places contrast does a lot.
If I take the Atten out the picture goes overload again, so it needs the atten at present. Last edited by oldticktock; 8th May 2010 at 7:58 pm. |
8th May 2010, 7:33 pm | #455 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
cannot remember what was the post #. I have the radio and TV service books and that has some info on the V4 setup.
Cheers Trevor appreciate all your advice |
8th May 2010, 7:34 pm | #456 |
Retired Dormant Member
Join Date: Jan 2007
Location: Westbury, Wiltshire, UK.
Posts: 2,451
|
Re: Pye v4
Still looks like cap' trouble to me
Dave |
8th May 2010, 7:39 pm | #457 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
It looks like cogging on the left side but I have changed all caps except electrolytics and the flat round decoups.
MR2,MR4 & MR5 have been changed, but still there are MR1 ,3,6,7,8,9. As PJL (Peter) said this bloomin set will end up having nearly everything changed before it gives up the fight. Left hand side of the testcard is completely cut-off, not there at all Last edited by oldticktock; 8th May 2010 at 7:50 pm. |
8th May 2010, 7:54 pm | #458 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
I've adjusted as best I can and this is what we get. left side is missing nothing brings helps.
|
8th May 2010, 8:58 pm | #459 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
|
Re: Pye v4
You might as well change the diodes. They all look like signal diodes although only MR3 looks like it has much to do with the sync. Have you really done all the caps now?
|
8th May 2010, 9:05 pm | #460 |
Retired Dormant Member
Join Date: Nov 2009
Location: Weardale, UK.
Posts: 1,981
|
Re: Pye v4
All the waxies except one on the back which is on the fuses have been removed, still lots of low value pF's which are white and of course the flat rounds.
All elctrolytics are original |