blown two zx 700.5s and two deq 9200a - Page 2

rolexcomm · 24th October 2009, 01:37 AM

I'll check it in the morning when I get back to work and see what else I can come up with. I did ohm the power transformers several times in the board and did have continuity throughout the transformers. The windings look intact and not burned. What I can tell you is that it has battery voltage on one side and 7v on the other side.... But I'll check it as you have asked and get back to you on that...

Fyi, all checks that I have done have been with the board out of the case. Since I originally saw low voltages I pulled it and have been bench testing with no case.

nigelwright7557 · 24th October 2009, 03:01 AM

Quote:

Originally Posted by Perry Babin

Touch your meter probes together. Subtract what you read with the probes shorted from the resistor readings. Do you still get near 1 ohm for the resistors?

I bought a cheap digital meter with the same problem.

I found if I run the selector around a few times the meter settles down to close to 0 ohms. Probably needs a bit of contact cleaner on it.

rolexcomm · 24th October 2009, 03:29 PM

Checked like you said and no change at all. But i went ahead and redid the irf 3204 and some of them marked 0 at first then the impedance went up. I am gonna go ahead and change them. They don't cost much so I'll change them later today and retest...

rolexcomm · 24th October 2009, 04:13 PM

Correction irf 3205.......

rolexcomm · 28th October 2009, 04:38 AM

alright update with this one, new irf 3205 and new irf 9204. All have been exchanged. I am still getting continuity through the rca shields and b+. I haven't powered it up yet to check voltage changes due to the continuity on the shields. Do you got any other recommendations as to what to check?

Perry Babin · 28th October 2009, 04:55 AM

IRF9204?

0 ohms from B+ terminal to shields?

rolexcomm · 28th October 2009, 04:58 AM

no 22k

rolexcomm · 28th October 2009, 05:02 AM

yeah, i went ahead and replaced the irf 9204's too. Maybe my number is wrong, don't have it in front of me. But almost all transistors have been replaced. The only ones I haven't replaced are the bigger ones that start with k..

Perry Babin · 28th October 2009, 05:06 AM

9204 sounds more like a date code than a part number. Double-check and post the actual part number before applying power.

22k isn't likely a problem.

rolexcomm · 28th October 2009, 03:27 PM

IRF 3205 and IRF 9640

28th October 2009, 04:55 AM	#16
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	IRF9204? 0 ohms from B+ terminal to shields? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

28th October 2009, 05:06 AM	#19
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	9204 sounds more like a date code than a part number. Double-check and post the actual part number before applying power. 22k isn't likely a problem. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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24th October 2009, 01:37 AM	#11
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	I'll check it in the morning when I get back to work and see what else I can come up with. I did ohm the power transformers several times in the board and did have continuity throughout the transformers. The windings look intact and not burned. What I can tell you is that it has battery voltage on one side and 7v on the other side.... But I'll check it as you have asked and get back to you on that... Fyi, all checks that I have done have been with the board out of the case. Since I originally saw low voltages I pulled it and have been bench testing with no case.

24th October 2009, 03:29 PM	#13
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	Checked like you said and no change at all. But i went ahead and redid the irf 3204 and some of them marked 0 at first then the impedance went up. I am gonna go ahead and change them. They don't cost much so I'll change them later today and retest...

24th October 2009, 04:13 PM	#14
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	Correction irf 3205.......

28th October 2009, 04:38 AM	#15
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	alright update with this one, new irf 3205 and new irf 9204. All have been exchanged. I am still getting continuity through the rca shields and b+. I haven't powered it up yet to check voltage changes due to the continuity on the shields. Do you got any other recommendations as to what to check?

28th October 2009, 04:58 AM	#17
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	no 22k

28th October 2009, 05:02 AM	#18
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	yeah, i went ahead and replaced the irf 9204's too. Maybe my number is wrong, don't have it in front of me. But almost all transistors have been replaced. The only ones I haven't replaced are the bigger ones that start with k..

28th October 2009, 03:27 PM	#20
rolexcomm diyAudio Member Join Date: Oct 2009 Location: Where there are too many latin babes!!	IRF 3205 and IRF 9640

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