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 Post subject: grundig Locarno 3/u
PostPosted: Jun Fri 07, 2019 12:53 am 
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Joined: Feb Mon 24, 2014 5:51 pm
Posts: 20
does anybody have or know where i can purchase a service manual for a grundig locarno 3/u? I need spec's for the output power power transistors.


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 Post subject: Re: grundig Locarno 3/u
PostPosted: Jun Fri 07, 2019 4:58 am 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 9158
Location: Mountains of Mourne. Ireland.
The transistors are shown on this schematic.
viewtopic.php?p=3031109#p3031109

AD161
https://www.radiomuseum.org/tubes/tube_ad161.html

AD162
https://www.radiomuseum.org/tubes/tube_ad162.html

If yours are different, they should be labeled?
Google will cross-reference them.

Greg.


Edit: The CS155 schematic that I linked to on 5-20-2019 looks to be the same as this...
3/U Chassis CS155U/MS
https://www.radiomuseum.org/r/grundig_m ... 55ums.html


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 Post subject: Re: grundig Locarno 3/u
PostPosted: Jun Fri 07, 2019 3:23 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 9158
Location: Mountains of Mourne. Ireland.
There are two, eight-page service manuals for tuner/radio chassis CS155 here...
one if French and one in German.
https://www.doctsf.com/grundig-cs-155/f35773/ori=ps

Do not purchase any literature from Cicon Electronics!
Greg.


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 Post subject: Re: grundig Locarno 3/u
PostPosted: Jun Sat 08, 2019 2:18 pm 
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Joined: Aug Wed 26, 2009 1:50 am
Posts: 1517
Location: Mesquite NV 89027 (from Coventry, UK)
egg wrote:
Do not purchase any literature from Cicon Electronics!
Greg.

I second that, they are a bunch of crooks.


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 Post subject: Re: grundig Locarno 3/u
PostPosted: Aug Mon 05, 2019 8:42 pm 
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Joined: Feb Mon 24, 2014 5:51 pm
Posts: 20
Thanks for all the info. Schematics and transistors. I figured that since I got this one free, I'd fix it. Replaced all four blown output transistors with nte155's and 131's. Installed 10 watt 15 volt zener diode, Overkill, what the heck. I had one. First 1 amp on board fuse was blown. Actually all 3 fuses were fast blow, should be slow blow. Replaced them all. Replaced six electrolytics. Main fuse was ok. Still no sound. I checked the continuity of the external speaker connection. Nothing. I bypassed them by soldering a piece of wire on each. Boom, the stereo plays clear as a bell. Am, fm and shortwave. No sense wasting deoxit on them. I don't like hooking external speakers to these vintage stereos.

Once again, thanks for the help


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