Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
R_J
that was it - under the C8 there wasn't enough of solder - now I have -71vdc
and a C5 i have +14.2vdc and at C10 I have -14.1vdc
I am going to go buy another C8 due to it bulging and I need to get Q18 / Q22 as they shorted and was originally blowing the fuse when I bought the amp broken.
Thanks to you and Budm for your assistance so far!
Tecchris0516
Member
Last Activity: 04-15-2019, 11:14 PM
Joined: 04-25-2018
Location: New Jersey
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
R-J
I did have -70vdc on C8 -- referencing your attachment
On the Red arrows = I have from Left to Right 70v 13v 13v
On the Green Arrows = I have from Left to Right @ C7 (-70v) but at the resistors I have -.74 and I cant find a break between C7 (- side) to the R9A/R9 resistorsLeave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Budm,
Well I re-measured the voltage at the C6 and C8 caps with ref to the circuit GND- on C6 I had 50.8VDC and on C8 I had 70.8VDC.
So for the hell of it - I reinstalled the original Caps ( replaced both due to one was slightly bulging) and rechecked - now both Caps are at approx 71vdc.
For Transistor MPSW06 (NPN) - which meter neg to ref GND
E- 11.46vdc
B- 12.02vdc
C- 13.0vdc
For Transistor MPSW56 (NPN) - which meter neg to ref GND
E- .74vdc
B- .20...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
BudM,
Thank you for taking to time to stick with me. Based on your comment i guess I am incorrectly testing the component(s) - I have attached how i have been testing. Can you please enlighten me to the correct point for GND ref and i will be more than happy to supply the data to help get this working
The second image after looking at the schematic again - I green circled the GND ref- is this correct?...Last edited by Tecchris0516; 09-13-2018, 07:02 AM.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
BudM,
Sorry for the delay - Busy at work
Voltage from transformer -
AC1-AC2 -53.4vac
AC3-AC2 -53.6vac
AC1-AC3 -106.8vac
After Bridge - 121.6v DC
voltage to (R6-&A) and (R9& R9) 51.5v after 10v
For Transistor MPSW06 (NPN) - which meter neg to GND( Neg side of rectifier bridge)
E- 8.82vdc
B- 9.52vdc
C- 10.12vdc
For Transistor MPSW56 (NPN) - which meter neg to GND( Neg side of rectifier bridge)
E- .54vdc
B- 0...Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Hello All,
Well I reinstalled the old Q2 and Q3 with the original ones - when I measure between C5 (+) and C10 (-) i only get about 8v.
If i measure the voltage after the (R6-&A) and (R9& R9) I have about 10v ( before the resisitors (51.6V)
I also checked the voltage through the FB1 and FB2 an it is the same on both sides..Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Bud, - JR
Thank you for the response - the fuse is not blowing right now due to me removing the Mosfets. But the 15v is not anywhere near 15V - I will check Q2 and Q3 as I did replace those as well with a cross NTE128P (NPN) & NTE129P (PNP). The only reason why i chenged them as to multiple posts about issues with them. I might put the old ones back and see what I get.Leave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Hello JR,
Yes I do have the service manual and have been going through it until my eyes crossed, along with reviewing the data sheets for components - the fuse it correct (2.0a/250v) slow blow)
the voltage out of the rect bridge is 121v DC - the voltages at the MOSFET's are 70v along with the same voltage at the MOSFET driver - (IR2111)
I am trying to find out what controls +15v - MOD and -15v - MOD and +15VSWLeave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Hello all,
I was wondering if someone can help me out with the above post
Thank youLeave a comment:
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Re: Infinity PS-12 Powered Subwoofer Fired Amplifier
Hello All,
New to hear - but a huge wealth of information - I just got a PS-10 from a Garage sale - that didnt power up - Internal fuse was blown - replaced the fuse and immediately blew- did some preliminary checking and form the Q18-22 MOSFETS were bad - replaced and powered up but lasted for about 3 sec and fuse blew again - check and mosfets bad again !
I began checking some voltages and i have some questions
What is the output voltage (DC) from the bridge- i have over 100vDC
What...Leave a comment:
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