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Old 17th January 2013, 09:20 AM   #1
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Default Philips 22AH587 replica modules

For usage in a Philips MFB replica : 3ch LM3886 based poweramp with DC protection and onboard buffercaps. Component side, 80 x 100 mm.

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Solder side

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Partially assembled

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3ch substractive xover, limiter and mfb correction logic, component side.

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Solder side:

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Fits snugly in the original transformer compartment

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Last edited by chriscam; 17th January 2013 at 09:24 AM.
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Old 27th August 2014, 04:01 PM   #2
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Good day to you,
Re- Phillips Motional Feedback Amplifier Speakers [22 AH 587]
Please can you help, I am in need of professional help in identifying the loss of amplification and renewing the failed component. I can supply more information of the fault, a PDF of my original instruction book and photos of the pc board etc.
In return I am sure I can offer to help with my profession being a Heating and Electrical Engineer with over 30 years in this, although I did serve my time as a Joiner and could advise on this.
If this, like me is outside of this knowledge and you know someone more knowledgeable, would you kindly pass this message over.
Regards Michael
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Old 28th August 2014, 04:42 PM   #3
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just post what you got on the forum, and those who can will help for sure.
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Old 29th August 2014, 11:38 AM   #4
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The green Standby and the red Operating neon indicators are working, and a little sound (maybe it is coming from the pre-amp). I can see there is a 24v relay on the PC board and my thoughts are to test for resistance through the coil and check that there is voltage to this coil when the operating indicator is On, and report back on this (the other speaker has had a new amplifier fitted last year)?
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Old 29th August 2014, 12:08 PM   #5
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Have you checked the basics ?

You have to start somewhere... so I would check initially that the minus 35 and plus 35 volts rails are present on the output stage and that the output (before the speaker relays) is at zero volts. There are two power amps that I can see. On for the woofer and one for the tweeter. Check both.

If that is OK then you need to check all the rails as a starting point. Start at the input stages and check working from input to output.
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Old 4th September 2014, 03:41 PM   #6
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Mains Transformer Voltage Readings Between;
A = 234 vac Input source
B = 116 vac
C = 116 vac
D = 25.6 vac
E = 25.6 vac
F = 0 vac Input source?
Relay; resistance across coil .576 KΩ.
With no voltage until the red Operating neon indicator is on; then giving 10 vac.
Resistance across a paired contacts was .000 MΩ whilst 10 volts were present.

Notes: my meter did not identify DC only AC (maybe I needed to set the range?).
F indicates another input source?
Relay indicates 24 vdc (I havenít seen contacts illustrated on the relay cover like these before, I donít understand the working/movement of them?).
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Old 4th September 2014, 04:31 PM   #7
Mooly is online now Mooly  United Kingdom
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All those voltages will be AC. You need to move on to the actual circuitry and check the DC value of all the supplies. You see those big blue caps in one of your earlier photos. What DC voltage is across each of those.
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Old 5th September 2014, 08:49 AM   #8
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Big Blue Capís Voltage Readings Between;
G = 33.5 vdc
H = 33.4 vdc
I = 33.2 vdc
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Old 5th September 2014, 09:33 AM   #9
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Quote:
Originally Posted by Michael 5of9 View Post
Good day to you,
Re- Phillips Motional Feedback Amplifier Speakers [22 AH 587]
Please can you help, I am in need of professional help in identifying the loss of amplification and renewing the failed component. I can supply more information of the fault, a PDF of my original instruction book and photos of the pc board etc.
In return I am sure I can offer to help with my profession being a Heating and Electrical Engineer with over 30 years in this, although I did serve my time as a Joiner and could advise on this.
If this, like me is outside of this knowledge and you know someone more knowledgeable, would you kindly pass this message over.
Regards Michael
Michael, you could also try to register on the Dutch forum (enough people there can also communicate in english) : MFBfreaks.com • Forumoverzicht

I know several aspects of this type MFB have been handled over there..

Cheers,
Edwin
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Old 5th September 2014, 10:38 AM   #10
Mooly is online now Mooly  United Kingdom
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If you are going to repair this then you have to be reasonably confident working your way around a circuit diagram and being able to locate parts.

Those voltages sound OK but one will be a plus voltage and the other minus. Are the two fuses OK (marked on diagram next to the caps) ?

You then need to confirm that the output stages (only one shown here) are receiving that supply and also that the output point is at zero volts as shown on the diagram.
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