[TechAssist] Re: Technics power amp SU-Z45 -power transformer open [FIXED]
- From: Al Gutz <alg@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 10 Oct 2004 21:13:52 -0400
Gary
What usually blows those is they get the unit turned up full volume and
leave it on for a couple of hours. The heat builds up and the fuse does
it's job. Have looked up specs on some open ones it transformer and they
appear to be mostly around 105 to 115 deg C.
Al G
Gary McCartney wrote:
> I used the thermal fuse I had and the amp now runs fine. The transformer
> only runs warm to the touch so it appears the old thermal fuse must have
> just gave out. Thanks for all the replies.
>
>
>
>
> Gary McCartney
>
> McCartney Electronics
> Guelph Ontario Canada
> Est. 1984
> email: gary (at) number63.ca
>
>
>
>
>
>
>
>
> Gary McCartney wrote:
>
>>Glenn and Robert, thanks for the info. Do you know what temperature that
>>thermal fuse is rated at? I'm not going to send an order to the USA to
>>import a $2.00 part but I do have some fuses here. I have some NTE8149's
>>but they are rated at 306 deg. F which seems way too high for this
>>application. Do I mount the external thermal fuse to the side of the
>>transformer or should I mount it up against the winding?
>>
>>
>>
>>
>>Gary McCartney
>>
>>McCartney Electronics
>>Guelph Ontario Canada
>>Est. 1984
>>email: gary (at) number63.ca
>>
>>
>>
>>
>>
>>
>>
>>G.Larkman wrote:
>>
>>
>>>Gary,
>>>
>>>Robert is correct.
>>>You will have an open thermal fuse.
>>>To replace these is relatively simple.
>>>I use a SK876, available from Andrews/Tritronics for a couple of bucks.
>>>DONT be tempted just to bridge the terminals or use a standard fuse in its
>>>place.
>>>With the price of the thermals there is no excuse to take a chance like
>>>that.
>>>
>>>Glenn Larkman
>>>Audiotech
>>>256 Nth Hwy 101
>>>ENCINITAS CA 92024
>>>760 944 9048
>>>FAX 944 0345
>>>mail to"mail@xxxxxxxxxxxxx"
>>>"www.audiotech.net"
>>>----- Original Message -----
>>>From: "tvservice" <tvservice@xxxxxxxxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Wednesday, October 06, 2004 7:15 AM
>>>Subject: [TechAssist] Re: Technics power amp SU-Z45 -power transformer open
>>>
>>>
>>>That most likely has a thermal fuse wrapped inside the transformer.
>>>try measuring from either side of AC cord to primary of transformer you will
>>>find where it connects and can solder in a fuse for testing.
>>>Robert
>>>tvservice@xxxxxxxxxxxxx
>>>H & H Electronics Inc
>>>
>>>----- Original Message -----
>>>From: "Gary McCartney" <gary@xxxxxxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Wednesday, October 06, 2004 9:02 AM
>>>Subject: [TechAssist] Technics power amp SU-Z45 -power transformer open
>>>
>>>
>>>
>>>
>>>
>>>>I have a Technics power amp SU-Z45 in the shop that has an open primary
>>>>winding on the power transformer. There is a spare (not connected to
>>>>circuit)pin coming out of the transformer which has continuity with one
>>>>of the primary winding pins. I am wondering if this spare pin could
>>>>possibly be the pin used in Europe for 220V AC power? If so, I might be
>>>>able to connect the amp up with a 110V to 220V step up transformer and
>>>>use the 220V winding in the amp's transformer.
>>>>
>>>>Does anyone have any info on this model? Does the primary winding have a
>>>>built in thermal fuse? What are the secondary winding output voltages?
>>>>
>>>>THanks for any help.
>>>>
>>>>I found photos of this amp on the net. Here's the link:
>>>>
>>>>http://users.pandora.be/frank4/audio/technicssuz45/
>>>>--
>>>>
>>>>
>>>>
>>>>
>>>>Gary McCartney
>>>>
>>>>McCartney Electronics
>>>>Guelph Ontario Canada
>>>>Est. 1984
>>>>email: gary (at) number63.ca
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
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