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Robertson 4010 Schematic
Robertson 4010 Schematic
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Old 13th April 2006, 03:01 AM   #1
al2002 is offline al2002  India
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Default Robertson 4010 Schematic

Just wondering if anyone here has a copy of the circuit diagram for the Robertson 4010 power amplifier, mid 1980s vintage? If so, I'd appreciate a copy.

Thanks.
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Old 13th April 2006, 08:29 AM   #2
sreten is offline sreten  United Kingdom
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Hi,

i'd like to see it too !

/sreten.
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Old 7th February 2013, 03:43 PM   #3
michelf is offline michelf  Canada
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I'm looking for the service-manuals or circuit diagram.
Thanks in advance
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Old 29th October 2017, 03:30 PM   #4
grandschmu is offline grandschmu
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Samething, looking for schematics. I have a 4010 with a hum noise on the two sides. Maybe the rectifier capacitors? Or an ground open resistor? Have an idea?
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Old 29th October 2017, 05:17 PM   #5
tony.garner is offline tony.garner  United Kingdom
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Have a Robertson 4010 amp sweet and powerful. Would also like copy of schema
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Old 30th October 2017, 10:36 PM   #6
djk is offline djk
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I have repaired them without the schematics, they are a cross-coupled dual-diff input, fully complimentary from input to output.

I have had to dig the potting compound out of the input modules to repair them (modules being unavailable).

A solder joint in the potted module had failed, the parts themselves were OK.

Use a 75W lightbulb tester in series with the power cord for a few days before buttoning up for good. I had a potted module fail about four hours after replacing the outputs and drivers, the lightbulb saved the new parts, allowing me to find the potted module defect.
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Old 31st October 2017, 08:13 AM   #7
tony.garner is offline tony.garner  United Kingdom
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So what did you find in potted module. I think transistor and resistor but do you have the values/types
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Old 31st October 2017, 11:04 PM   #8
djk is offline djk
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One TO-220 transistor, and a 1/4W resistor (values not remembered),

The problem was just a bad solder joint.

It was not too bad to dig out the potting compound, and the parts values were easy to read. An easy (if time consuming) repair.
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