Advertisement
Replied to Tomko Services, Inc.'s post on December 8th, 2016

Attempting to source main PCB, p/n: 32976.  

Unit blows fuses when switched on even with all components disconnected from board.  No evidence of fluid intrusion evident.  Flash from MOV occurs  as both fuses blow.  Any advice appreciated.  

Thanks in advance!

-Bill

avatar: VerSki
VerSki
26 posts
Replied to Tomko Services, Inc.'s post on September 10th, 2019

I'm guessing that this is due to a short between one of the triacs on the board which drive the main motor, and an earthing point on the board. There is a row of 6 (?) triacs which drive the motor, and the one nearest to the edge of the PCB is quite close to an earthed mounting screw. It doesn't take much (physical damage, or splillage of a buffer e.g.) to create an electrical bridge between this triac and earth, which will cause the mains fuse to blow.  

avatar: SaharaSimba
SaharaSimba
81 posts
Replied to Tomko Services, Inc.'s post on September 10th, 2019
VerSki is point on. If you want to source a new board ...call Eppendorf. If you would like parts or to repair your board call Sahara Simba Electronics