I recently acquired a Juno 106S from Japan. One of the first thing I want to do is to change primary on the transformer to 120V so that I no longer require to use a step up transformer.
I was wondering if its advisable to replace the fuses after this modification? I’ve seen regular North American Juno 106 units (and occasionally North American HS-60’s) with higher fuse values.
My 106S looks as follows:
Also, the regular 106 units seem to have more fuse sockets on its power board, the 106S doesn’t have this.
I also want to install an IEC socket also. Is it advisable to not connect the ground wire to the chassis or is it? I’m reading different opinions online. Some say not to do it because the 106/S/HS units were never equipped with a ground socket, but its not clear why you shouldn’t ground the 106 after modification.
Anyone who could shed some light on this? Thanks!
It’s a fairly simple process for Japan to US conversion. Just change the primary lead attached to 100V to the 120V (117V) lead. C1 on the power PCB (the small one) is noted as the same for both 100/117 and 220/240V units (it’s different in the 106). The 106S/HS-60 service manual calls for a 2A 125V fuse, versus a 1A 250V that the standard 106 uses. You won’t need to change it unless it was originally set up for European operation.
The secondary power PCB doesn’t seem to note anything for fuses at F2 and F3 that I can see, and I’ve never seen one set up for European power, so I can’t confirm that they did or didn’t place fuses at F2 and F3.
I’ve not found any strong cases for grounding or not grounding. The only thing I would strongly recommend is that you make sure the grounding wire is well secured. You definitely don’t want a grounded wire flopping around and able to touch any of the primary wires. Make sure, if you do ground it, to secure the ground wire with zip ties (like seen in your picture) and ensure that any sort of bolt/screw is well tightened, preferably with a locknut and/or star washer.
Thanks Madisynths for confirming the fuses and grounding.
There are plenty of regular Juno 106 service manuals out there, but could not find one for the HS/106S.
