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Old 18th August 2006, 02:39 PM   #1
marko is offline marko  United Kingdom
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Default eqt not powering up!

just bought a pair of "new" eqt's off the bay, but one refuses to power up, i've had a poke around and not getting 12v to the main transformer and 4 caps, any ideas what's wrong?
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Old 18th August 2006, 03:23 PM   #2
Puggie is offline Puggie  United Kingdom
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Voltage reg, just to the left of the power socket on your pic? tricky to see on your small pic.
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Old 18th August 2006, 03:39 PM   #3
marko is offline marko  United Kingdom
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bill, if you save the pic it should then blow up when you open it and zoom in, this site only allows a certain size!

what about the voltage reg? is this the tranny with 5 legs?
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Old 19th August 2006, 11:13 AM   #4
marko is offline marko  United Kingdom
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update, the small diode circled in red should have 1.5v on the left leg, it doesn't so untill this gets power nothing is happening!

the right leg is earth and ok, the middle leg is 3.5v power in so i'm guessing the diode is toast?
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Old 19th August 2006, 10:37 PM   #5
TO-3 is offline TO-3  Peru
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Quote:
Originally posted by marko
update, the small diode circled in red should have 1.5v on the left leg, it doesn't so untill this gets power nothing is happening!

the right leg is earth and ok, the middle leg is 3.5v power in so i'm guessing the diode is toast?
Can you take a zoomed-in photo of that area? It is too grainy when I zoom in. You are talking about the transistor, right? Can you read a part number on it?
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Old 19th August 2006, 10:39 PM   #6
marko is offline marko  United Kingdom
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Old 22nd August 2006, 04:56 PM   #7
marko is offline marko  United Kingdom
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right chaps, progress!! it's the 5 legged transister to the left of the power input socket. i know for sure as i swapped the one out of the "good" eqt and it now works fine.

now the originally good eqt is minus one transistor part # LT1070C

where can i get an LT1070C or LT1070CT from?
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Old 22nd August 2006, 09:46 PM   #8
Puggie is offline Puggie  United Kingdom
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www.cpc.co.uk
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Old 22nd August 2006, 10:18 PM   #9
marko is offline marko  United Kingdom
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cpc do have them but they are 9.71 + postage!!! had a look on ebay and i can get 2 for about 9 inc post from the US!!

also, what's the differance between LT1071, LT1071C and LT1071CT? the unit i just pulled out has the following on it

LT1071
CT

am i right in thinking it's an LT1071CT?
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Old 22nd August 2006, 11:37 PM   #10
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The 'C' components have a narrower temperature range than the 'I' version. The 'C' version is perfectly suitable for the application. The letters stand for Commercial and Industrial.

The 'T' indicates that it's in the 5 legged TO-220 package.
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