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Old 11th Jun 2021, 2:34 pm   #1
g0hze snowy
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Default ISOTECK IPS 1810 variable power supply

Good Afternoon Gents and gentesses, i have the above power supply, it appears to be working ( well sort of), i get a variable voltage and current.
When i attach it to my electronic load it delivers a full 10 amps without any worries ( from the front panel) but on having a grope at the twin heat sinks at the back, one is considerably hotter than t'other.
Ah ha says i, those 3 x 2n3055 ( there are 6 in total) are lazy and not doing their share of the load, i elected to replace all the 3055's, when they turned up 1 had its emitter to case lead rusted almost thru', on the new ones, so i chose 3 others and fitted those, the supply didn't work again, took them out and replaced them with originals and it worked, probable Chinese copies, sent them back for a refund.
Ok so that war and peace over with, Is there anybody out there in radio/electronics land with a circuit diagram/schematic that i can beg borrow purloin a copy of to assist with identifying a possible fault with this item.
Thanks in anticipation
Snowy G0HZE
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Old 11th Jun 2021, 5:29 pm   #2
MelJon66
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Default Re: ISOTECK IPS 1810 variable power supply

Hi Snowy,

RS's Iso-Tech brand tend to be re-badges of GW-Instek products. This link has a use manual download link and may be similar but you may need an older version.

https://www.gwinstek.com/en-global/p...s/detail/GPR-M

Cheers
Mel
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Old 11th Jun 2021, 6:11 pm   #3
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Default Re: ISOTECK IPS 1810 variable power supply

Hi Mel
Thanks for that info, it seems to be exactly that model pal.
Still looking for the schematic but i can take the voltages from 1 bank of trannies and compare them with the other.
That may point me in the right direction
cheers
Snowy
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Old 11th Jun 2021, 6:16 pm   #4
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Default Re: ISOTECK IPS 1810 variable power supply

Mel, i dropped a bo bo, my meter must be older that what is shown as it has meters rather than displays, otherwise it looks the same, snowy
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Old 12th Jun 2021, 7:00 am   #5
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Default Re: ISOTECK IPS 1810 variable power supply

Hi Snowy,

If you look in the GPR-M series user manual on the link I gave it lists the versions and the analogue display, GPR-1810H, version is probably what you have. The analogue meter version is probably discontinued now but the analogue/digital display versions are probably covered by the same manual. I haven't been able to find a service manual or schematic for download but the Goodwill Instrument Co Ltd in Taiwan may provide a schematic if you contact them.

Their contact page is here and the service department is listed:

https://www.gwinstek.com/en-global/Global_Site/index

email: services@goodwill.com.tw

A quick email takes little time and is worth a try.

Let us know how you get on and good luck.

Cheers
Mel
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Old 12th Jun 2021, 7:52 am   #6
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Default Re: ISOTECK IPS 1810 variable power supply

Good Morning Mel
Thanks for the additional info, yes i did find the metered version as you pointed out once i printed off the manual.
I will drop the goodwill company an email later today.
Thanks for all your help.
Snowy G0HZE
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Old 12th Jun 2021, 12:51 pm   #7
chriswood1900
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Default Re: ISOTECK IPS 1810 variable power supply

Not sure but this may be some help.
https://www.itm.com/pdfs/cache/www.i...0hd-manual.pdf
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Old 12th Jun 2021, 3:17 pm   #8
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Default Re: ISOTECK IPS 1810 variable power supply

Thanks Chris, i have this info.
cheers
Snowy
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