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Dead CXA300.1
Dead CXA300.1
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Old 17th May 2019, 06:56 PM   #11
Perry Babin is offline Perry Babin  United States
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PapaZBill Will get you through the rest of the repair. IF the PS FETs opened, there is likely more damage down the line.

Since the 300.1 doesn't have an on-board fuse, I'd suggest that you use a distribution block so you can use an appropriate fuse, for this amp alone.
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Old 17th May 2019, 07:04 PM   #12
zinoyracer is offline zinoyracer  United States
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Is there a preferred style of fuse? Is AGU fast acting enough?
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Old 17th May 2019, 07:18 PM   #13
Perry Babin is offline Perry Babin  United States
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AGU is OK but there are problems with a lot of the AGU fuse holders. That said, for a small amp like this, the AGU should be OK.

A better option would be a plug-in type fuse with a good fuse holder. For larger amps, the fuse and fuse holder are more critical. What's important is to use a fuse that's rated low enough to offer the best protection to this amp. The owner's manual calls for a 40 amp. A 30 would likely be enough in a MAXI type fuse.
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Old 17th May 2019, 08:59 PM   #14
zinoyracer is offline zinoyracer  United States
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Awesome, I was planning on also reducing the fuses on the other amp and also my Arc 1100.5 in my other car after reading a blog by, I "think" it was Zed, which recommended using fuses just large enough based on the gain actually being run for extra protection. Using what common sense I have, the cxa300.1 has proven otherwise lol, it sounded like a solid theory. Seeing your advice if a 30amp fuse for this one reminded me of that article and then I remembered Mother's day when I was overly excited to test out the amp, noticed there wasn't a fuse and said hmmm is it inside or do I need to get one... "Well, it's just a test and I have a fuse up front anyway..." *Shame* .... 4guage kit came with a 80amp fuse :'(

So just to make sure I understand correctly, even though I don't have 0 ohms on B+ to GND... I should still pull the FETS tomorrow then get the IC measurements requested earlier. You had mentioned If I had 0 ohms to pull and test.
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Old 18th May 2019, 01:16 AM   #15
Perry Babin is offline Perry Babin  United States
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I understood that it was blowing the fuse when wired correctly. Generally, when an amp is blowing the fuse before remote is applied, it has a short across B+ and ground. That short is typically the PS FETs or the RP (reverse protection) diode. Pulling the FETs would have allowed you to see which it was.

If the amp is not doing anything, It's possible that the FETs opened internally. They generally make a mess when doing this but sometimes not. You can remove them and check them.

At some point, you may be asked to check the voltage at various points in the circuit with the amp powered up. You should have a low-rated fuse (5 -10A) or a current limiter in series with the B+ line to help protect the amp in case your probes slip or in case there is another problem.
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Old 18th May 2019, 02:19 AM   #16
PapaZBill is offline PapaZBill  United States
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My guess is the mosfets opened up and took at the driver IC 18021. After removing and checking the mosfets. Do the ohmmeter check I suggested earlier when you can.

If and when you have to replace the mosfets and IC, the following are mouser links you can use. Note the AOT460 is obsolete and Mouser gives a cross reference to IRF1018EPBF. I have no experience with this device, someone else may be able to chime in with a replacement suggestion.

IRF1018EPBF Infineon Technologies | Mouser

MP18021HN-LF-Z Monolithic Power Systems (MPS) | Mouser
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Old 19th May 2019, 07:05 AM   #17
zinoyracer is offline zinoyracer  United States
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all ohm readings in k...

b+ to ground with transistors out 1.49 then climbing

IC2
1-2.08
2-1.99
3-16.27
4-4.02
5-open
6-3.38
7-1.41
8-1.73
9-1.56
10-1.56
11-1.73
12-6.24
13-1.72
14-1.72
15-2.88
16-7.67

IC3
1-6.40
2-6.40
3-3.6
4-1.42
5-1.57
6-1.42
7-1.57
8-3.55

aot460 - DS 1.776 , DS 1.776 open when leads reversed
aot412 - DS 1.33 , DS 1.38 open when reversed
mur1620ct - black on center pin 1.208 , 1.266 open when reversed
mur1620ctr - red on center pin 1.187, 1.187 open when reversed
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Old 19th May 2019, 10:19 AM   #18
zinoyracer is offline zinoyracer  United States
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Default Updated test numbers.

Sorry for the incorrect readings earlier my dmm wasn’t zero’d pls ignore my last post .. see new readings below...



QUOTE=zinoyracer;5795819]all ohm readings in k...

b+ to ground with transistors out 1.49 then climbing
1-5.6k
2-4
3-.709M
4-21.7k
5-open
6-16.44k
7-.9
8-2.66k
9-1.23k
10-1.23k
11.-2.7k
12-42.5k
13-2.7k
14-2.7k
15-12.4
16-51.7


IC3
1-42.5j
2-43.2k
3-19.3k
4-1.0
5-1.22k
6-1.22k
7= 1ohm
8-19

aot460 - DS 1.1M DS 1.228 open when leads reversed
aot412 - DS .975M x DS 1.38 open when reversed
mur1620ct - black on center pin .881M , .893 open when reversed
mur1620ctr - red on center pin .477M, .747M open when reversed[/QUOTE]
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Old 19th May 2019, 10:51 AM   #19
Perry Babin is offline Perry Babin  United States
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For most transistors, it's best to test as follows.

Terminal numbers:
1-2:
1-3:
2-3
Reverse probes
1-2:
1-3:
2-3

If you want to be sure that there is no confusion, change from ohms to diode-check and repeat. I realize that this is a bit much to post. If nothing else, do this when checking them for yourself. When you don't have to post the numbers, it takes longer to change meter modes than it does to do the tests.

For testing 2-3 on FETs, it reduces the chance of errors if you short leg 1-3 with a jumper.

This is just an FYI. No need to repost.
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Old 19th May 2019, 01:39 PM   #20
PapaZBill is offline PapaZBill  United States
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Based on the readings the IC's appear to be good. I was mainly concerned with IC3 and Pins 3 & 8. I'm assuming that pin 8 is 19kohm(Pin 3-19.3Kohm) and not 19ohms. If it is that low then the 18021 is shorted internally.

If Pin 8 is 19Kohm then check R105-4.7ohms. This resistor may have burned and the value has increased, if so you will need to replace the 18021 and mosfets as well,

If R105 is in value the next step will to be measure the DC voltages around the IC3 and IC2, again using power ground for the black probe.You will won't to leave the AOT460's out, and remove R68-4.7Kohm. This is the sense resistor for the shutdown circuit. Use Perry's instructions I've quoted below. With no power supply mosfets you shouldn't have an issue.Use common sense and be prepared to shut down the power if necessary. Post your readings as you did before.

At some point, you may be asked to check the voltage at various points in the circuit with the amp powered up. You should have a low-rated fuse (5 -10A) or a current limiter in series with the B+ line to help protect the amp in case your probes slip or in case there is another problem.
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