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| Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Identifying pinning on hybrid audio output IC
Before trying to find a/pair replacement for a
dual 50W power amp. I know the + and - rails, inputs and outputs pins of the two amps but can anyone suggest the fuction of the remaining pins ? compensation,bypass etc. A) via 150K to one side of the 53V ac secondary of the mains transformer. B) connected via 47 ohm to a -15 rail C) connected via 50V,10uF to this 47 ohm and then -15V rail D) via 6V,33uF to ground DC voltages at these pins A) 0V B) - 14.3 C) -13.2 D -4.3V electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse |
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#2
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On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook"
wrote: Before trying to find a/pair replacement for a dual 50W power amp. I know the + and - rails, inputs and outputs pins of the two amps but can anyone suggest the fuction of the remaining pins ? compensation,bypass etc. A) via 150K to one side of the 53V ac secondary of the mains transformer. B) connected via 47 ohm to a -15 rail C) connected via 50V,10uF to this 47 ohm and then -15V rail D) via 6V,33uF to ground DC voltages at these pins A) 0V B) - 14.3 C) -13.2 D -4.3V electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse What's the number on the IC? It's not usually that hard to find a data sheet online. Andy Cuffe |
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#3
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"Andy Cuffe" wrote in message
... On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook" wrote: Before trying to find a/pair replacement for a dual 50W power amp. I know the + and - rails, inputs and outputs pins of the two amps but can anyone suggest the fuction of the remaining pins ? compensation,bypass etc. A) via 150K to one side of the 53V ac secondary of the mains transformer. B) connected via 47 ohm to a -15 rail C) connected via 50V,10uF to this 47 ohm and then -15V rail D) via 6V,33uF to ground DC voltages at these pins A) 0V B) - 14.3 C) -13.2 D -4.3V electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse What's the number on the IC? It's not usually that hard to find a data sheet online. Andy Cuffe Actually a svi3102a . I have the service manual for the amp but these 4 pins are not identified on the schematic. A) is probably power on / off mute circuit D) perhaps Bias |
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#4
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The SVI3102A is still an available part, from MCM & a number of other sources.
-- Stephen Sank, Owner & Ribbon Mic Restorer Talking Dog Transducer Company http://stephensank.com 5517 Carmelita Drive N.E. Albuquerque, New Mexico [87111] 505-332-0336 Auth. Nakamichi & McIntosh servicer Payments preferred through Paypal.com "N Cook" wrote in message ... "Andy Cuffe" wrote in message ... On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook" wrote: Before trying to find a/pair replacement for a dual 50W power amp. I know the + and - rails, inputs and outputs pins of the two amps but can anyone suggest the fuction of the remaining pins ? compensation,bypass etc. A) via 150K to one side of the 53V ac secondary of the mains transformer. B) connected via 47 ohm to a -15 rail C) connected via 50V,10uF to this 47 ohm and then -15V rail D) via 6V,33uF to ground DC voltages at these pins A) 0V B) - 14.3 C) -13.2 D -4.3V electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse What's the number on the IC? It's not usually that hard to find a data sheet online. Andy Cuffe Actually a svi3102a . I have the service manual for the amp but these 4 pins are not identified on the schematic. A) is probably power on / off mute circuit D) perhaps Bias |
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#5
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"Stephen Sank" wrote in message
... The SVI3102A is still an available part, from MCM & a number of other sources. -- Stephen Sank, Owner & Ribbon Mic Restorer Talking Dog Transducer Company http://stephensank.com 5517 Carmelita Drive N.E. Albuquerque, New Mexico [87111] 505-332-0336 Auth. Nakamichi & McIntosh servicer Payments preferred through Paypal.com "N Cook" wrote in message ... "Andy Cuffe" wrote in message ... On Wed, 5 Jan 2005 20:21:06 -0000, "N Cook" wrote: Before trying to find a/pair replacement for a dual 50W power amp. I know the + and - rails, inputs and outputs pins of the two amps but can anyone suggest the fuction of the remaining pins ? compensation,bypass etc. A) via 150K to one side of the 53V ac secondary of the mains transformer. B) connected via 47 ohm to a -15 rail C) connected via 50V,10uF to this 47 ohm and then -15V rail D) via 6V,33uF to ground DC voltages at these pins A) 0V B) - 14.3 C) -13.2 D -4.3V electronic hints and repair briefs , schematics/manuals list on http://homepages.tcp.co.uk/~diverse What's the number on the IC? It's not usually that hard to find a data sheet online. Andy Cuffe Actually a svi3102a . I have the service manual for the amp but these 4 pins are not identified on the schematic. A) is probably power on / off mute circuit D) perhaps Bias In UK 40 GBP (80 USD) so yes and no. I tend to try and replace with a couple of TDA7294V at 6GBP each. without the internal power on/off muting. |
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#6
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On Thu, 6 Jan 2005 18:29:17 -0000, "N Cook"
put finger to keyboard and composed: "Andy Cuffe" wrote in message .. . What's the number on the IC? Actually a svi3102a . FWIW, Google searches suggest that the SVI3102 is equivalent to an RSN3502. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
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#7
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SVI3102B is 27.50 pounds at dalbani.co.uk.
-- Stephen Sank, Owner & Ribbon Mic Restorer Talking Dog Transducer Company http://stephensank.com 5517 Carmelita Drive N.E. Albuquerque, New Mexico [87111] 505-332-0336 Auth. Nakamichi & McIntosh servicer Payments preferred through Paypal.com "Franc Zabkar" wrote in message ... On Thu, 6 Jan 2005 18:29:17 -0000, "N Cook" put finger to keyboard and composed: "Andy Cuffe" wrote in message .. . What's the number on the IC? Actually a svi3102a . FWIW, Google searches suggest that the SVI3102 is equivalent to an RSN3502. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
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