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Old 24th August 2012, 05:15 AM   #1
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Location: Kingston, Jamaica
Default Orion DEQ30

i recently acquired a Orion deq30, when i wired it up it did not turn on at all.
Opened it up and found an internal 1.5amp fuse that blew, bought another one thinking i bought it like that, and the same happened again.

so either its pulling excess current or something is shorting out.

Im not very skilful, im a 2nd year engineering student so i have a bit of knowledge but not in depth enough YET.

so im hoping someone can give me some help while i go thru it starting from the power section.

if this does not work, i am considering to sell it on ebay by next week MONDAY

wish me luck
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Old 24th August 2012, 06:47 AM   #2
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I plan to upload a picture as soon as i find the camera, the fuse is a AGU 1.5A 250V fuse which serves to protect in the event of a power surge or short circuit,

After it i found a L7805CV voltage regulator which has a maximum output current of 1.5 Amps, how convenient lol.
description here:
L7805CV: ST MICRO: ICs & Semiconductors

My question now is how do i test it by itself to ensure it is the problem, can i remove it from the circuit board and simply test with a multimeter or do i need a power supply.
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Old 24th August 2012, 10:41 AM   #3
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Location: Anchorage AK
a power supply is handy. imo, one sure way is to see what happens with it removed first. if you can power, first install it without the emitter leg connected and read the voltage. if the fuse shorts, the regulator is likely at fault.
at a meere 1.5a, you likely have many odd and end power adapters/chargers laying around that could fit the bill.
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Old 24th August 2012, 11:21 AM   #4
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guess ill find an adapter and splice it.....ill do it first thing once i wake. but wait? the data sheet doesnt seem to tell me which leg is the regulator or the emitter. i need to pay more attention in school lol
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Old 24th August 2012, 11:33 AM   #5
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Not the best of pictures because i was using a blackberry

neways the 4 metal pins from right to left are as follows 12V, Ground, REM1, REM2

the rem2 simply serves to add other components.


So what ur saying akheathen is to simply detach the the IC and test two feet at a time?
Ill look back on the datasheet to see which legs i need to open HAR HAR HAR.
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Old 24th August 2012, 11:43 AM   #6
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I googled it all, i feel so dunce

well i hope it all works out, then ill be running to radio shack
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Old 24th August 2012, 09:16 PM   #7
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as far as i know, radio shack only carries the hobby level components. i get resistors and such there, but any of the egc level parts, like transistors, i would only be using for testing purposes, for reliability reasons.
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Old 24th August 2012, 10:48 PM   #8
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they only carry non genuine parts? who would you reccomend then? any website?
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Old 25th August 2012, 02:08 AM   #9
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i buy from digikey, but there are many sites, like tayada, arrow, mouser, etc. a google search for the part number will bring up many sites
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Old 25th August 2012, 05:03 AM   #10
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so the Fuse did not blow, I found a ADAPTER which was 12V 1.5A it gave about 11.49V

but i did get a light which means the board has a chance,

If im correct the EQUALIZER has three sections,
-one section powers the CLIP LEDS and Digital display,
- secondly the amplification of the signal
-and the third the manipulation ie equalization of the signal

ive traced the circuit using the continuity which i then come across a IRF9540, im gonna remove the legs of it and see if the fuse blows
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