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1968RT
Joined: 13 Mar 2010
Posts: 51
Location: michigan
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 Posted: Wed Oct 08, 2014 8:51 pm Post subject: Harman Kardon HK3350 |
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| 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? |
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Google
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 Post subject: Advertisement |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Oct 08, 2014 9:07 pm Post subject: |
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| Checked for open fuses and shorted audio output transistors? |
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1968RT
Joined: 13 Mar 2010
Posts: 51
Location: michigan
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| Posted: Wed Oct 08, 2014 9:31 pm Post subject: |
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| 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. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Oct 08, 2014 9:39 pm Post subject: |
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| Elektrotanya has manual. Also look for bad solder joints. |
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1968RT
Joined: 13 Mar 2010
Posts: 51
Location: michigan
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| Posted: Wed Oct 08, 2014 9:49 pm Post subject: |
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| Thanks. Do I have to unsolder the transistors to check them with a DMM? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Wed Oct 08, 2014 9:55 pm Post subject: |
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| Not if you are looking for very leaky or dead shorts. I would recommend discharging power supply electrolytics before testing. |
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1968RT
Joined: 13 Mar 2010
Posts: 51
Location: michigan
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| Posted: Thu Oct 09, 2014 11:42 am Post subject: |
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| 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? |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Thu Oct 09, 2014 1:59 pm Post subject: |
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| Check joints on other boards too. Power supply transistors, connector plugs & sockets, etc. |
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1968RT
Joined: 13 Mar 2010
Posts: 51
Location: michigan
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| Posted: Thu Oct 09, 2014 2:08 pm Post subject: |
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| 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. |
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JTS1957
Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
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| Posted: Thu Oct 09, 2014 3:10 pm Post subject: |
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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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