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Old 7th March 2014, 07:06 AM   #11
inOr is offline inOr  United States
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Jackinnj, Thanks for the tip. I'm trying to join the group. Seems their membership approval is as fussy as they are active. But I'll persist.
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Old 29th March 2014, 01:33 AM   #12
wjcoll is offline wjcoll  Australia
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Default UPDATE

Hi again all,

Well it took a while but all the bits and pieces I was chasing finally arrived. I replaced the dead 0.068uF cap (C904) and the thermistor (RT901) , then tentatively push the power switch. Another blown fuse !!!!!!!!!! Exactly the same condition exists. I'm suspecting whatever took out the first two components didn't stop there. These two were easy to spot with some help from advice here as they were physically damaged. So where to from here? Any suggestions would be greatly appreciated. Feeling a bit deflated at the moment. Murphy's law dictates it could never be as simple as I first thought.

Thanks again,
Wayne
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Old 29th March 2014, 01:54 AM   #13
Salas is offline Salas  Greece
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Did it take out the replaced components again though? Any tantalum caps around that fail shorting, a blown power semi...
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Old 29th March 2014, 02:15 AM   #14
wjcoll is offline wjcoll  Australia
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Hi Salas,

No, the components I replaced don't appear to have been affected. The fuse blows only on powering up, not when mains is switched on so I can assume it's after the switch, although that doesn't exclude much from the possibilities. I'll do as you suggest and check the tantalum caps in the area.

Many thanks,
Wayne
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Old 29th March 2014, 02:18 AM   #15
Salas is offline Salas  Greece
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It was just one of the damages restored then. Yep, seek for more.
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Old 29th March 2014, 02:21 AM   #16
Salas is offline Salas  Greece
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If you got ESR meter check main lytics also or look for domed tops and chemical stains clues.
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Old 29th March 2014, 02:31 AM   #17
wjcoll is offline wjcoll  Australia
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Thanks Salas,

I don't have an ESR meter but I was intending to get one, so now is obviously the right time.

I've done a very close visual inspection of the power supply region and there's no hints (visually) of any of the lytics having age or stress problems. That being said, it mean nothing as we know they can die anomalously. It may end up being a case of replacing caps down the line from the switch until I strike it lucky.

Cheers,
Wayne
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Old 29th March 2014, 02:57 AM   #18
Salas is offline Salas  Greece
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I got MESR-100 that works reasonably well that I can recommend you have a look at.
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Old 29th March 2014, 03:05 AM   #19
wjcoll is offline wjcoll  Australia
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Thanks,

I'll check it out.
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Old 29th March 2014, 06:31 AM   #20
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Location: West Australia, straight over the road from the beach, natural ambient sounds only.
Put a lamp (40W/60W) in series with 240V supply.
This will prevent the fuse blowing and give you time to measure voltages, and diagnose what's crook.

Dan.
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