Devere 504 .. Newbie questions.

[wiseowl]

Hi,

just splashed out on a 504 with dichromat head. Lovely enlarger apart from the minor fact that I can't get the light on!

The lamp is OK, just thought I'd get that suggestion out of the way first.

The transtab makes plenty of buzzing noises and when I switch it in the fan starts and lights come on behind the filter settings windows, so it is gettingt power and the fuse is OK. When I throw the "focus" switch I don't get the main light on, neither do I get 24v inside the head. Before I start taking it all to bits, does the transtab need a timer plugged into the 8 way socket before anything works, or should the lamp come on regardless?

If this is the case does anyone have a circuit for the timer plug. Or better still a circuit diagram for a transtab?

Cheers

Martin

[rmann]

Perhaps this is what you are looking for? http://cgi.ebay.com/De-Vere-timer-pl...QQcmdZViewItem

[BarryWilkinson]

Hi,

just splashed out on a 504 with dichromat head. Lovely enlarger apart from the minor fact that I can't get the light on!

The lamp is OK, just thought I'd get that suggestion out of the way first.

The transtab makes plenty of buzzing noises and when I switch it in the fan starts and lights come on behind the filter settings windows, so it is gettingt power and the fuse is OK. When I throw the "focus" switch I don't get the main light on, neither do I get 24v inside the head. Before I start taking it all to bits, does the transtab need a timer plugged into the 8 way socket before anything works, or should the lamp come on regardless?

If this is the case does anyone have a circuit for the timer plug. Or better still a circuit diagram for a transtab?

Cheers

Martin

Hello Martin,

I have never tried to switch on the lamp without a timer plugged in but I would assume it to work. I will try mine tomorrow and let you know if you don't get a positive reply by then.

I would also like to get a circuit diagram for a transtab. There is more than one type though. I may also have details of the plug connections.

Barry

[BarryWilkinson]

Hello Martin,

Just tried my head with the timer removed. The focus switch turns the enlarger lamp on. Sounds like a transtab problem? I have also heard of bulb connector failure in the head (burnt).

Sorry I have not found my connector details yet.

Barry

[wiseowl]

Thanks for trying that Barry. Gives me something to work from.

Cheers

Martin

[philldresser]

Hi,

just splashed out on a 504 with dichromat head. Lovely enlarger apart from the minor fact that I can't get the light on!

The lamp is OK, just thought I'd get that suggestion out of the way first.

The transtab makes plenty of buzzing noises and when I switch it in the fan starts and lights come on behind the filter settings windows, so it is gettingt power and the fuse is OK. When I throw the "focus" switch I don't get the main light on, neither do I get 24v inside the head. Before I start taking it all to bits, does the transtab need a timer plugged into the 8 way socket before anything works, or should the lamp come on regardless?

If this is the case does anyone have a circuit for the timer plug. Or better still a circuit diagram for a transtab?

Cheers

Martin

Martin

I have a 504 with dichoric head. This should work without the time, however my Transstan is silent (no buzzing). I have had to replace the lamp fitting due to it overheating and the contacts (2 prongs) go brittle. The bulbs do get quite hot. Other than that all I have needed to do is replace the bulb. The wiring inside is very basic, Have you tested to see if you are getting 24v to the lamp holder?
Maybe I have an older version than yours but my dials are lit by the lamp itself and not a seperate bulb.
Cheers

Phill

[wiseowl]

Yes I have checked for 24v at the head and sadly not a single one of the little blighters manages to get there. I do get 24v at the timer socket, my initial investigation into the tran-stab look as though it has to go through this. I'll have to look a little deeper.

There's a lot of transformer in the steel case so I'm not overly surprised at the buzzing, but it could of course indicate a short somewhere.

Thanks for the help.

Martin

[BarryWilkinson]

Martin,

Is the transtab, the brown one with a square connector for the head?

My current transtab has a round connector but I do have a spare 'square' type (250W) which I could loan you if it would help?

Barry

[wiseowl]

Martin,

Is the transtab, the brown one with a square connector for the head?

My current transtab has a round connector but I do have a spare 'square' type (250W) which I could loan you if it would help?

Barry

Thanks, that's very generous Barry. My transtab is brown with a rectangular plug for the head. This has 8 pins, 4 for the 24v (2 each in parallel), the other 4 are for mains. 1 each for live, neutral the other 2 are earth.

I won't borrow yours just yet, but if I fail on this one I might very well take you up on the offer.

Cheers

Martin

[BarryWilkinson]

No problem Martin, just PM me if you want it. I'm in North Somerset 19-23 May so not too far away.

Barry