Search found 145 matches
- Sat Jan 18, 2020 7:16 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
the 2 bias pots where turned down all the way. I turned them up until the point I can see that there is a peak moment in amp use, the point that the BJT's are coming to live. Don't know a better way to explain this. Now the amp is pulling around 5A. But the overload LED is still on. So what happens ...
- Fri Jan 17, 2020 12:28 pm
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
is it usually so that the 2 green LED's and red LED are turned on the same time? The green on LED should be out as the red LED is turned on, not?
- Wed Jan 15, 2020 8:42 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
changed the LM393 and the green led's are working but now the red overload LED is activated. The 4 bias LED's are working. I have no shorts in the output transistors but one IRFZ44 of the voltage regulators is shorted (Q32). Replaced al 4 of them. The red overload LED is still active. Pfff my motiva...
- Wed Jan 08, 2020 8:59 am
- Forum: Car Audio
- Topic: Ms-275 cap question
- Replies: 2
- Views: 2229
Re: Ms-275 cap question
you wil not hear the difference
- Sun Jan 05, 2020 5:18 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
think I found the problem. I was so focused on the control board but the problem is not on this board. The problem is on the fan board. The fans are working so that is why I skipped this at first. There is also a LM393 on the fan board in the right corner that is getting the 15v from the same circui...
- Mon Dec 30, 2019 2:09 pm
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
I have 3V where I should have 15v so something is pulling it down
- Sun Dec 29, 2019 11:03 am
- Forum: Installs
- Topic: planing a build with the M series amps
- Replies: 21
- Views: 26411
Re: planing a build with the M series amps
this system has everything to sound top notch!
Where did you find these amps in this condition?
Hope you changed the power supply caps...
Where did you find these amps in this condition?
Hope you changed the power supply caps...
- Sun Dec 29, 2019 8:09 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
did find some time to continue with this repair. I did change all the broken diodes and resistors + I changed the KA339. Put the board back in the amp and powered up the amp. result: the 4 bias red LED'sare working + the 2 fans but no green LED's on the vertical board. I measured the voltage over th...
- Sun Nov 03, 2019 9:15 am
- Forum: Car Audio
- Topic: Decals phoenix gold...
- Replies: 11
- Views: 7260
Re: Decals phoenix gold...
is the MS1000 sold?
was to expensive for me... I live in Europe that is asking price + shipping + 33% tax
was to expensive for me... I live in Europe that is asking price + shipping + 33% tax
- Mon Sep 23, 2019 8:07 am
- Forum: Car Audio
- Topic: Help diagnosing zx475ti problem
- Replies: 9
- Views: 5015
Re: Help diagnosing zx475ti problem
start with the 10 0.51Ohm 1W resistors. If these are ok start with everything that is connected wit the 2 LED's. You said that the 2 front channels are working so it has to be in the 2 rear channels. Sart with the resistors and then the diode's. If you have a magnifying glass use it. If a resistor i...
- Sun Sep 22, 2019 4:08 am
- Forum: Car Audio
- Topic: Help diagnosing zx475ti problem
- Replies: 9
- Views: 5015
Re: Help diagnosing zx475ti problem
First of all there are other forum members who have many, many more knowledge about these amps than me. I'm also in the learning curve but anyway I will try to help you before the other members chim in. Are you the first owner of this amp or not? The 2 red LED's are part of the bias circuit. You hav...
- Sat Sep 21, 2019 12:52 pm
- Forum: Car Audio
- Topic: Help diagnosing zx475ti problem
- Replies: 9
- Views: 5015
Re: Help diagnosing zx475ti problem
Hello and welcome on the forum!
is the Green LED light up?
is the Green LED light up?
- Sun Sep 15, 2019 7:17 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
Hi ttocs, I tried several times to become member of this group but it doesn't work. Status says "in treatment"
- Mon Sep 09, 2019 11:00 pm
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
Hi Jason! thank you so mush for this info. Now I can start finding the problem. The vertical boards are original V2 versions, I don't know why the first owner replaced so much components, I guess he handled the trial and error route. Do you have a link to the FB page? I did a search but cant' find i...
- Sun Sep 08, 2019 8:25 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
starting restoration...
- Sun Sep 08, 2019 6:42 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
some pictures when the amp just arrived...
- Sun Sep 08, 2019 6:31 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
Re: ZPA 0.5 control board problem
hello Ttocs!
the switch is not in it's bypassed...
the switch is not in it's bypassed...
- Sun Sep 08, 2019 6:19 am
- Forum: Car Audio
- Topic: ZPA 0.5 control board problem
- Replies: 41
- Views: 17783
ZPA 0.5 control board problem
Long time ago I bought this amp on a second hand site. It's a standard V2 version.The outside of this amp is like in new condition. Also the plexiglas is in top condition. This is what convinced me to buy this amp. I payed the top price for this amp. When the outside is in top condition after al the...
- Mon Sep 02, 2019 9:59 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
found the tutorial from Eric about the pot meters.
Thank you Eric for your countless contributions to this forum.
It's a wonder that even after 8 years this info is still here.
Thank you Eric for your countless contributions to this forum.
It's a wonder that even after 8 years this info is still here.
- Sun Sep 01, 2019 3:20 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
The parts from Digikey arrived and the flat cable is replaced. Today I powerd up the amp and it plays wonderful! Just the sensitivity pot is giving a lot of distortion when you turn it up or down. Once it is set correctly it works fine. There is another post from zztunnell who has the same problem s...
- Sun Aug 25, 2019 11:06 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
Hello Eric! Thank you for the info but I want to keep the repairs as close as possible to the original. Thank you Jason for the part number, this saves me a lot of time with the search module.
- Sun Aug 25, 2019 7:43 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
The corrosion is caused by leaking PSU caps. Half of the pins of the vertical pcb are also very bad corroded. So I took out the vertical pcb and cleaned the pins and through holes. After putting everything back the power supply is working! By doing this I damaged the flat cable between X-over and ma...
- Sun Aug 18, 2019 8:58 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
Think I find the problem. Lilviper you where right! Because I knew it was in the power supply region I checked all the paths wit a magnifying glass and guess what. Few inches away from the sg3525 there was a place where 2 diodes, 2 resistors and 2 caps that had bad connections to the board. Because ...
- Sun Aug 18, 2019 2:28 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
Today I removed the 2 diodes that separate the power supply and the outputs. The 2 diodes test ok. When I power up nothing changed (fan is running and red LED burning) so I think that the problem is in the power supply section. I changed the SG3525 controller because I have no 6V on the gates of the...
- Sat Aug 17, 2019 11:39 am
- Forum: Car Audio
- Topic: ZX500 going into overload
- Replies: 21
- Views: 15254
Re: ZX500 going into overload
what about the transformer: is it normal that when the amp is not powered up the windings are shorted?
Below is a picture, the red = shorted
Below is a picture, the red = shorted