Dansette Conquest auto mk2 (Actually a mk1).

[Skintin]

Hi guys,

Just obtained the Dansette Conquest auto. There is power going to the unit, but no sound from the speakers. I changed the cartridge out, and still no sound. The valve seems to be working, as heaters come on etc.

Could the possible problem be the smoothing caps?

Thanks for any advice in advance.

[Nuvistor]

Have a read of the information in this article, it gives lots of advice, it's about radios but the fault finding section is good for record players.
http://www.vintage-radio.com/repair-...ion/index.html

I doubt if the smoothing caps are causing the problem, they may well be faulty but there will be something else causing the lack of sound.
Note all safety items for yourself and others.

Frank

[Station X]

It's no use guessing what might be wrong and changing components on that basis.

You need to get your meter out and take some voltage readings. There are dozens of posts describing how to do this. Many members here will help you to interpret the results.

I suggest you start by measuring the DC voltage from chassis to each section of the smoothing cap.

[Edward Huggins]

When you say Dansette "Conquest" Mark 2, and as there is no photo, I am assuming it is the later version with one speaker and 2 valves. If it has 2 speakers and 1 valve, it's a Mark 1. Which one is it please? Edward

[Skintin]

Hi Edward.

It seems to be the MK1 with two speakers and one ECL82 valve. I have replaced the two capacitors in the photo. This didn't match the circuit board on the player, so i thought it was the MK2 as shown in the attachments.

64uF 10V
0.01uF 400V

The first capacitor was loose and was measuring out of range, the second was showing signs of decay...so I replaced that too. Still no sound coming from the speakers.

[Edward Huggins]

Well yes, this is definitely the Mark 1 "Conquest" so we now know where we are. Why did you replace those caps? Are you getting any sound when you touch the red lead on the cartridge or control grid on the triode of the ECL82. Have you checked the HT voltage coming from the contact-cooled rectifier or onto the output transformer primary? I agree in that it is unlikey to be the smoothing caps. In your case there are 3 caps in the one can, 2 off these are for smoothing - 16uf and 32uf. Edward

[Skintin]

I get no sound whatsoever from touching either the the red lead or the cartridge. In fact I'm getting no sound at all. I replaced the caps because 64uF was loose one one end and out of range when tested. The second was decayed at one end.

Yes. The smoothing can is 32uF 275VDC x2 and one 25uF 25VDC.

[Station X]

64uF is an odd value for a capacitor. I would have expected all the electrolytic caps in this player to be inside the aluminium can.

Follow Edward's advice and measure some voltages.

[Skintin]

Looking at the photographs the yellow capacitor was a Lemco 64uF 10V and the orange one was 0.01uF 400V.

[Station X]

OK. The only Dansette I can see with the combination of electrolytic capacitors you describe, an ECL82 and a solid state rectifier, as shown in your pictures is a Dansette Monarch.

[Skintin]

I replaced with 67uF 10V and a mica 10nF 400V. That's why when I looked at the schematic for the mk1 these capacitors were not on the drawing. however when you look at the mk2 schematic then they appear on there.

[Station X]

It certainly says "Conquest" on the front panel.

Can you post a larger version of the circuit you show in post 5 please. It's too small to read.

[ms660]

The schematic posted by the OP shows it as Conquest Auto MK11, the Monarch shown in the R&TV Servicing books appears to have the same schematic, as Graham mentioned earlier.

Lawrence.

[peter_sol]

It is possible someone has been making complete record players out of several others.
You will have to work with what you have.
Do you have a meter?

[Skintin]

yeh i have a meter handy.....im on the sick after a operation so trying to fill my time in by getting this up and running. thanks guys for all the support and experience that comes with this forum.

[ms660]

As has been suggested by others, voltage readings next, if the valve heaters glow then DC voltages on all the valve holder tags except tags 4 & 5.

Lawrence.

[Skintin]

ECL82

1. 1.72mv fluctuating
2. 6.6mv
3. 153.0 v
6. 0.2mv fluctuating
7. 24.4mv fluctuating
8. 12.5v fluctuating
9. 0.966mv fluctuating

[Cobaltblue]

I could be wrong but I suspect what you have identified as Pin 1 is pin 9 or else there's not supposed to be an ECL82 in that socket

Cheers

Mike T

[Skintin]

Yes you're righ,t just brought a schematic up for an ECL82.

1. 0.966mV fluctuating. (Control grid of triode section).
2. 12.5V fluctuating (Cathode of pentode section).
3. 24.4mV fluctuating (Control grid of pentode Section)
6. 0.2mV fluctuating (Anode of pentode section)
7. 153.0V (Screen grid of pentode section)
8. 6.6mv (Cathode of triode section)
9. 1.72mv fluctuating (Anode of triode section)

thanks for pointing that out

[ms660]

Originally Posted by Skintin

ecl 82
1. 1.72mv fluctuating
2. 6.6mv
3. 153.0 v
6. 0.2mv fluctuating
7. 24.4mv fluctuating
8. 12.5v fluctuating
9. 0.966mv fluctuating

Are you reading the valve tags in the correct orientation as viewed from underneath? If so then double check those voltages just to be sure.

The tags on the valve holder as viewed from underneath are the same as the valve pins as viewed from underneath as shown in this link for the ECL82:

http://www.r-type.org/pdfs/ecl82.pdf

That sheet shows the valve pin numbers as viewed from underneath and also the corresponding electrode connections within the valve itself, I posted that in case your not familiar with valve pin orientation arrangements.

EDIT: Whoops...post crossed.

Lawrence.