Boss Chorus Ensemble CE-1 burnt Transformer help

[richon]

Hi,

A friend of mine blew his Chorus Ensemble CE-1
http://3.bp.blogspot.com/-Gql659utqNA/T9sblknZqjI/AAAAAAAABdY/QSO3aAmZJU8/s320/boss_ce-1_chorus_ensemble-785603.jpg

So, after checking everything the transformer shows no output voltage and I can't find any info on how much volts should it give to the PCB

Does someone knows if there's only one version of it?


greetings from Chile

[Govmnt_Lacky]

Well...

According to the schematic I found here:

http://www.generalguitargadgets.com/boss/BossCE-1v2.gif

It looks like a step down transformer from 120VAC to a center-tapped secondary that provides 18V-0V-18VAC should do it. They are pretty common so I would think it is just a matter of finding one that fits the voltage, current, and size requirements you desire.

Good Luck 

P.S. Apparently, there are 2 versions of the pedal. Both schematics are on the GGG website!

[richon]

The transformen has only two output cables ... They get to a dpdt power switch And then to the Pcb ... So i'm a little confused

[Govmnt_Lacky]

The transformen has only two output cables ... They get to a dpdt power switch And then to the Pcb ... So i'm a little confused

As you can see in the schematic, the transformer SHOULD have 3 outputs. 2 of them do go to the DPDT switch (those are your 18VAC outputs)

The 3rd output is the GROUND that is used for the circuit. I do not know how yours is wired up but, the PROPER way would be to follow the schematic and use a center-tapped transformer. I believe the "proper" rating would be 120VAC input and 36VAC output CENTER TAPPED.

EDIT: Some older transformer-based pedals either clipped or did not use the center tap on the secondaires. Instead, they just tied ALL of the ground points together and I believe they went back to the neutral connection of the primary or the Earth connection of the power plug. I would advise going according to the schematic though 

[Govmnt_Lacky]

http://www.ebay.com/itm/Power-Transformer-115-VAC-to-36-VAC-CT-at-0-35A-Lot-of-3-/160730779849#ht_68wt_1399