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Harman Kardon HK3350    
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1968RT



Joined: 13 Mar 2010
Posts: 51
Location: michigan

PostPosted: Wed Oct 08, 2014 8:51 pm    Post subject: Harman Kardon HK3350 Reply with quote

Problem with a Harman Kardan HK3350 stereo . About 20 seconds after power up "ERROR" reads on the display. Does anyone know what this means? If not, how about a site to find out?
Google

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JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Wed Oct 08, 2014 9:07 pm    Post subject: Reply with quote

Checked for open fuses and shorted audio output transistors?
1968RT



Joined: 13 Mar 2010
Posts: 51
Location: michigan

PostPosted: Wed Oct 08, 2014 9:31 pm    Post subject: Reply with quote

Yes on the fuses. Just opened it up and looked for anything obvious. Don't have a schematic or manual yet. Set was bought used. It did initially work for about a year.
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Wed Oct 08, 2014 9:39 pm    Post subject: Reply with quote

Elektrotanya has manual. Also look for bad solder joints.
1968RT



Joined: 13 Mar 2010
Posts: 51
Location: michigan

PostPosted: Wed Oct 08, 2014 9:49 pm    Post subject: Reply with quote

Thanks. Do I have to unsolder the transistors to check them with a DMM?
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JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Wed Oct 08, 2014 9:55 pm    Post subject: Reply with quote

Not if you are looking for very leaky or dead shorts. I would recommend discharging power supply electrolytics before testing.
1968RT



Joined: 13 Mar 2010
Posts: 51
Location: michigan

PostPosted: Thu Oct 09, 2014 11:42 am    Post subject: Reply with quote

It started working without me really doing anything. All functions and output seemed normal. Then the ERROR came back, but went away by itself. I took the front PCB off - it contains all the switches, the flourescent display, and computer IC. I poked , prodded, and twisted. The ERROR came and went away, but not in response to anything specific or repeatable. Can't see any bad solder joints - although of course the computer chip has so many and they are so tiny it would probably be impossible to see one. I know these type of intermittent problems can be some of the hardest to diagnose and fix, but any suggestions?
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Thu Oct 09, 2014 1:59 pm    Post subject: Reply with quote

Check joints on other boards too. Power supply transistors, connector plugs & sockets, etc.
1968RT



Joined: 13 Mar 2010
Posts: 51
Location: michigan

PostPosted: Thu Oct 09, 2014 2:08 pm    Post subject: Reply with quote

Will do. As I sit here at my computer the stereo is switching between error and working over and over with no one anywhere near it.
JTS1957



Joined: 21 Jan 2009
Posts: 2340
Location: Far, Far Away

PostPosted: Thu Oct 09, 2014 3:10 pm    Post subject: Reply with quote

Switching back and forth should rule out shorted output transistors. I suppose the an intermittent inside some IC or transistor is possible.

See if you can find some voltage that changes as it cycles. Power supply lines, speaker protect line, etc.
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