so i BELIEVE i am looking at a bridge rectifier. its got 3 legs, one side flat, other rounded, model # says "K30A Y". almost doesnt matter-here's the question:
in the unit in question (yamaha cs-80), a WORKING voice card's bridge rectifier's voltage looks like this:
9
8
14
now on the voice im trying to FIX, the NON-WORKING one, it looks like this:
1
0
14
the question is this: does this guarantee fault in the bridge rectifier, or is it possible there is something UPSTREAM that could have failed that would cause the output voltages to look like such?
thanks as always guys!!!
bridge rectifier (?) question. its a simple one.
- RodC
- dead but not forgotten
- Posts: 2039
- Joined: Thu Dec 30, 2004 8:53 pm
- Location: Right outside the door
- Contact:
A bridge rectifier with 3 pins? Sure its not a regulator or a transistor?
See if you can find a datasheet.
See if you can find a datasheet.
'Well, I've been to one world fair, a picnic, and a rodeo, and that's the stupidest thing I ever heard come over a set of earphones'
http://www.beyondsanityproductions.com
http://www.myspace.com/beyondsanity
http://www.beyondsanityproductions.com
http://www.myspace.com/beyondsanity
sorry, its probably a transistor. my bad. here's a schematic of the board, it is the M-BOARD :
http://bermuda.ucd.ie/bridge/cs80/cs80_circ5.jpg
if i trace the +14v leg of the transistor(?), it comes directly from one of the incoming wires to the board. so if someone can confirm that a 3-legged beast of said description would have a 14v incoming leg, and supposed to be putting out 9v and 8v respectively on its other TWO legs, then i believe i can confirm a bad transistor.
http://bermuda.ucd.ie/bridge/cs80/cs80_circ5.jpg
if i trace the +14v leg of the transistor(?), it comes directly from one of the incoming wires to the board. so if someone can confirm that a 3-legged beast of said description would have a 14v incoming leg, and supposed to be putting out 9v and 8v respectively on its other TWO legs, then i believe i can confirm a bad transistor.
-
- gettin' sounds
- Posts: 103
- Joined: Wed May 07, 2003 8:18 pm
- Location: Oakland, CA
- Contact:
I'd guess that beastie is a 2SK30A N-channel JFET, you can google a datasheet for the pinout and specs. Since your board appears to use them as switches, it wouldn't be unusual to see the gate voltage go below the source voltage (to ensure complete cutoff), which appears to be the case. I suspect the problem lies in the direction of whatever is tied to the gate (probably the pin that's measuring 0V), but I'm just guessing.
Which part are you referring to on that schematic?rjd2 wrote:sorry, its probably a transistor. my bad. here's a schematic of the board, it is the M-BOARD :
http://bermuda.ucd.ie/bridge/cs80/cs80_circ5.jpg
if i trace the +14v leg of the transistor(?), it comes directly from one of the incoming wires to the board. so if someone can confirm that a 3-legged beast of said description would have a 14v incoming leg, and supposed to be putting out 9v and 8v respectively on its other TWO legs, then i believe i can confirm a bad transistor.
Bri
Who is online
Users browsing this forum: No registered users and 60 guests