Need help identifying electronic component

[phillrulz]

Hi guys at work im gonna try fix a welder cant remember which type, the "high frequency box" had a nice short across it not sure of the voltage of the board, board was fried as it had charred down to the fibreglass ( it failed and conducted) from what i remember the char was from R1 to R10 so skipped out 176k of resistance obviously blowing the resistor ( cracked ) in the past this board has been fixed from memory a track between two resistors blew out so there is a small bond wire between two resistors acting as the track. this schematic is purely from memory and should be taken with a pinch of salt there is 4 components which i labeled as diodes im not sure what they are, they look like diodes as they are black axial through hole components maybe 15mm  long where you would expect diode polarity line there is what i could describe as chevrons, see bottom right pcb picture, could anyone possibly help identify them, ive tried using a multimeter to check ( continuity across both ways diode check , resistance, capacitance ) problem is they are open circuit so i cant tell what they are...  the welder is obsolete so im the only chance it has of surviving. 

 

 

 

 

 

[Guest]

Graetz

http://en.wikipedia.org/wiki/Diode_bridge

[phillrulz]

Graetz

http://en.wikipedia.org/wiki/Diode_bridge

its not a diode bridge all they all face the same way 

[Guest]

its not a diode bridge all they all face the same way 

Is there any way that you provide us more precise schematics?

[Guest]

I've not seen such markings, but line being on one side and arrows pointing in both directions makes me think it could be an avalanche diode maybe.

The markings are on the cathode side, but still indicating that the current can flow in both directions. I'm just guessing though.

[phillrulz]

Is there any way that you provide us more precise schematics?

not until friday atleast, likelihood of me getting a schematic is low as i drew it out from looking at the board itself, its only a single layer board, that schematic is purely from memory as i said, but i know for sure all the unknown components face the same way as i checked that encase was a bridge rectifier. I desoldered it all it had was 54, no manufacture or part code

 

I've not seen such markings, but line being on one side and arrows pointing in both directions makes me think it could be an avalanche diode maybe.

The markings are on the cathode side, but still indicating that the current can flow in both directions. I'm just guessing though.

 

 

the orientation in the schematic is purely a guess, avalanche tends to be in weird packages this is like a diode just longer. But thanks