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26" Decca Colour 100 Chassis

 
Posts: 24
Joined: Fri May 17, 2013 5:27 pm

26" Decca Colour 100 Chassis

Post by yampy187 » Sun Jul 10, 2016 11:50 pm

Hi All.

Finally got round to having a look at this one. I picked it up from Mikey66 last week.

It looks to be a reasonably upmarket version of the 100 chassis. Possibly modified with DIN video inputs? a Texas instruments Teletext board (Disconnected for some reason?) and a nice little nixie channel display. There also seems to be a board missing out of the bottom of the set. possibly to do with the text board. All the main boards appear to be present.

Initial checks revealed a few sick looking electrolytics on the PSU panel. These have been changed. I unhooked the tripler then cautiously applied mains. The set appears to try and start up. pops from the speaker and after a second shuts down. If the i unhook one of the plugs on the LOPT panel the set appears to start up. Nixie illuminates, some form of line whistle can be heard then after a few seconds a fusible resistor on the convergence panel springs open.
This leads me to think the line output transistor (bu208) may be faulty? Ive got a few on the way tomorrow. Ive got a service manual now (Thanks Chris :aad )


Any pointers would be appreciated :)

Jan
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Posts: 499
Joined: Sun Aug 07, 2011 8:29 pm

Re: 26" Decca Colour 100 Chassis

Post by neil29 » Mon Jul 11, 2016 12:39 am

Hi Jan. Send jooles405 over on paul stennings forum a PM as the set was his before it became mine and he can hopefully fill you in with some history about it.

Cheers
Neil.

 
Posts: 24
Joined: Fri May 17, 2013 5:27 pm

Re: 26" Decca Colour 100 Chassis

Post by yampy187 » Mon Jul 11, 2016 12:18 pm

Hi Neil. Many thanks!

I shall give him a message.

Jan

 
Posts: 24
Joined: Fri May 17, 2013 5:27 pm

Re: 26" Decca Colour 100 Chassis

Post by yampy187 » Sat Jul 16, 2016 6:48 pm

Hi all.

Some slight progress with this set. I replaced the BU208. Power applied and i was rewarded with sound and line whistle. Power off and hooked up the tripler. Gave it mains again and the set fired up. Literally... The LOPT Caught fire :zx:

All voltages around the LOP area seemed to be reasonably close to what they should have been.

I don't suppose anyone has a spare Decca 100 line OP panel and a tripler languishing in a dusty box somewhere?? All costs met of course. Here's Hoping :aad

Jan

 
Posts: 499
Joined: Sun Aug 07, 2011 8:29 pm

Re: 26" Decca Colour 100 Chassis

Post by neil29 » Sat Jul 16, 2016 10:36 pm

Hi Jan. The fact that the lopt caught fire has surprised me as I had the set going more than once and never had a problem with it. I do have some spares for these chassis so if I can access them I can send you what you need.

Cheers
Neil.

 
Posts: 24
Joined: Fri May 17, 2013 5:27 pm

Re: 26" Decca Colour 100 Chassis

Post by yampy187 » Sat Jul 16, 2016 11:45 pm

Hi Neil.

Many thanks for the offer of spares :)

The Lopt looked in excellent condition so i was surprised myself. Would it be possible that a bad tripler could damage the transformer?

Jan


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