Request: service manual for Infinity SSW-210 (subwoofer)

prowlervm · Joined: 20 Oct 2014 Posts: 4

vtech,
Wow! Thanks for getting back to me so quick. Anyway, I don't think I got as lucky as wolfsongaudio...the reading came back at 9.99 with the ohm meter set to 20K. Is that what it should be? Not sure if it matters but everything in this amp (capacitors, etc) are original and the two 5W1K ohm white resistors located at R42 and R43 get very hot after about a minute of the amp being turned on. The circuit board is also blackish underneath that same area. Any other suggestions would be great. Thanks again...
Vince

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Hmm? Ok, let me get the schematic back out and look. I am posting from a different computer as my main one has given up the ghost-- may be a few days before i can post back.

prowlervm · Joined: 20 Oct 2014 Posts: 4

OK great....I really appreciate your help....

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

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Vince,
Based om your description, do a measurement on the 4 TP1 points and post back.(make sure that you are referenced to a good ground).
You mentioned the two 5 w resistors(R42,R43) seem to run HOT. Being a 5 Watt resistor, it may not be that unusual, however there may be other issues?

In looking back at your original IC pin reading, is there any sort of a hum/buzz/Tick sound as you touch any of the pins with the meter probe?
Still, not quite sure why you are reading Rail voltage at pin4 while the rest seem rather normal and R29 is OK? Is there any change in that reading as you put the resistor back? --(leave one side soldered and touch the other side as you read the meter.

prowlervm · Joined: 20 Oct 2014 Posts: 4

vtech,

Thanks for getting back...Anyway, I think I made it worse when I installed a new amplifier chip since we last spoke. The readings are not anything close to what they were (from the amp chip). All most all of them are either 65 or -65. Here are the readings fromTP1:
Pin 1 66.7
Pin 3 -1.25
Pin 5 .58
Pin 10 -66.9

It didn't make any noise when I checked the readings in the beginning. The only thing you here is a "click" when turning it on, followed by a hum from the speakers. I'm starting to think I should've left this to the professionals!
Vince

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Lets hope your new chip is not counterfeit? At this point, I still think your original IC is probably still ok?
HOWEVER, after posting your readings for the plus/minus 16 volt, there is definitely something wrong there. The plus/minus16 volts are used as a source for the opamp ic's IC1& IC2. Under normal operating condition, there is hardly any draw on that circuit The two readings are way down; so either they are pulled down (due to shorted opamps) OR the two zenersZD1,2 are shorted. Key is to first figure out what is pulling down your plus/minus 16 volt rails.---it is only used to power the opamps
As you can see it is a simple tap of the main rails which are regulated by two 16 volt Zeners and couple of electrolytic caps.

LocoStereo · Joined: 20 Feb 2015 Posts: 1

Hey all. I'm a new guy to the forum. I too am the victim of a dead subwoofer. I'd like to take measurements but was wondering if any of you have the values that I can compare my measurements with. Thank you.

wolfsongaudio · Joined: 22 Jan 2014 Posts: 7

My SS 210 is having a new and different issue. When powered on it has an intermittent buzzing from the drivers. Not affected by the crossover freq. or vol. controls. The noise is not a 60 hz hum but a buzz the fades in and out. I will pull the amp and re-test the 19 pins.

wolfsongaudio · Joined: 22 Jan 2014 Posts: 7

So the amp was pulled and the buzz is variable with the "bending" of the circuit board. Moving the board using a non conductive stylus results in the on and off of the buzzing. No particular area seems more sensitive than any other. I re-soldered most of the contacts from the bottom of the board with no luck. Any ideas?