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  #1  
Old 09-09-2017, 03:37 PM
aiway aiway is offline
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US version Leader LMV-185A to European mains voltage

Looks like US unit is capable to work on European 220v mains voltage because
on the back panel there is table: Fuse Data 90-132V and 180-240V.

No more any other power specification.

Any ideas does this really means that US unit can be connected to 240V?

Inside is power transformer which obviously doesn't accept direct 240V but power transformer primary winding has extra contacts which might be suitable for 240V.

Anyone knows where there is a service manual/circuit diagram available in the web?

Last edited by aiway; 09-09-2017 at 04:35 PM.
  #2  
Old 09-09-2017, 06:33 PM
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Skywavebe Skywavebe is offline
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Leader is very good a providing the service manuals to their equipment.
BEFORE plugging it in I would make sure the correct transformer mains is selected inside the unit.
Not bad to plug a 120 into a 240 unit but disaster the other way around.
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  #3  
Old 09-09-2017, 06:46 PM
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Skywavebe Skywavebe is offline
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Page 18 shows you what to do to connect to your voltage.
Attached Files
File Type: pdf LMV 185A INSTRUCTION MANUAL.pdf (703.2 KB, 5 views)
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Sam Palermo, BSEE , ProSquad Member
Skywave Tape Deck Repair- Chicago area
(630)616-0932 Office/ Email skywavebe@sbcglobal.net
Past Teac/Tascam Lead Service Technician at Chicago Factory Service still doing repairs.
http://s609729863.onlinehome.us/tape...uipment-repair
Now accepting MC, Visa, Amex & Discover Cards!
  #4  
Old 09-15-2017, 10:44 AM
aiway aiway is offline
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Thanks.

Setting to European 240V was successful.

Unit now power on but there are 2 more questions now.
1. When switching voltmeter on both needles jump to the end of scale for the moment. Is this by design?

2. One channel has some noise below 300mV. One channel needle starts to show erratic voltage when stepping down with level selector.
Needs time to diagnose.
  #5  
Old 09-15-2017, 12:48 PM
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Nakmandan Nakmandan is offline
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Yes, the meters usually deflect when first turned on.

As for the noise, does it do that if you ground the input? Is there any noise generators like fluorescent light bulbs nearby or other such noise makers? It could also just need a cleaning of the selector switch inside. Try switching the unit off and rotate the selector switch back and forth many, many times to clean off the oxidation from the contacts.
  #6  
Old 09-15-2017, 01:01 PM
aiway aiway is offline
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There is no noise in one channel only.
I tried rotating switch for 5 minutes but no remedy.

I don't have experiences but perhaps some conductive lubricant could fix if it's switch?
  #7  
Old 09-15-2017, 04:26 PM
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Skywavebe Skywavebe is offline
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This is why with low level signals and to the inputs I bridge a 75K resistor across the inputs to reduce the noise. In tape deck work there is not the need to go to real extreme low signals. The -50 and -60 dB levels need to be used with the UHF connector as noise is very much around us these days due to cell phones, LED lighting and Wi Fi. The air waves as compared to the 50's and 60's is full of garbage thanks to man.
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Sam Palermo, BSEE , ProSquad Member
Skywave Tape Deck Repair- Chicago area
(630)616-0932 Office/ Email skywavebe@sbcglobal.net
Past Teac/Tascam Lead Service Technician at Chicago Factory Service still doing repairs.
http://s609729863.onlinehome.us/tape...uipment-repair
Now accepting MC, Visa, Amex & Discover Cards!
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