pucho812

dbx 162 schematic needed
« on: May 02, 2018, 02:16:10 AM »
anyone have a real schematic for these things.  I did a google search only to find incorrect schematics. the general thought is that it is 2 X DBX160VU's but it has a completely different build. I am looking at 5 X daughter boards and a main board.

You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


mjrippe

Re: dbx 162 schematic needed
« Reply #1 on: May 02, 2018, 11:36:19 AM »
Here's everything I've got with 162 in the title  ;D
https://www.dropbox.com/s/hbaa65sn1m4kgoo/162.zip?dl=0

One is a general 160/161/162 service manual, the others are supposedly 162 specific. 

pucho812

Re: dbx 162 schematic needed
« Reply #2 on: May 02, 2018, 01:37:50 PM »
dude that is awesome. You sir are a delight. My buddy gave me his 162 to look at.

I already sense a PSU issue as the moment it turns on, the meters peg hard left.  I also see some faulty transistors which caused resistors to burn up.  this will be a fun one.
« Last Edit: May 02, 2018, 02:17:30 PM by pucho812 »
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

psych60s

Re: dbx 162 schematic needed
« Reply #3 on: May 02, 2018, 03:30:53 PM »
Nice find!! Too bad dbx didn't include daughter boards schematics.

pucho812

Re: dbx 162 schematic needed
« Reply #4 on: May 03, 2018, 01:40:13 AM »
Nice find!! Too bad dbx didn't include daughter boards schematics.

agreed
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

QUEEF BAG

Re: dbx 162 schematic needed
« Reply #5 on: May 03, 2018, 03:22:41 AM »
pucho -  make the 470uf caps in the power supply 1000uf
                   and the 22uf caps at the regulators at least 47uf if not more
                   (i would go with  up to 100).

pucho812

Re: dbx 162 schematic needed
« Reply #6 on: May 03, 2018, 03:41:38 AM »
pucho -  make the 470uf caps in the power supply 1000uf
                   and the 22uf caps at the regulators at least 47uf if not more
                   (i would go with  up to 100).

 8)
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

gyraf

Re: dbx 162 schematic needed
« Reply #7 on: May 03, 2018, 05:46:28 AM »
*like*  :)
..note to self: don't let Harman run your company..

QUEEF BAG

Re: dbx 162 schematic needed
« Reply #8 on: May 03, 2018, 02:14:12 PM »
which daughter boards?

pucho812

Re: dbx 162 schematic needed
« Reply #9 on: May 03, 2018, 02:46:31 PM »
all of them if possible.

So far model 230 which has 2 X  bc341 transistors on it.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


psych60s

Re: dbx 162 schematic needed
« Reply #10 on: May 03, 2018, 05:14:15 PM »
It would be nice to compile these schematics and have a definitive, solid resource for them. I haven't these boards right now to reverse engineer.

I have a pdf file for the 202 VCAs, but it is easy to find on the net.

Right after reading your post pucho I've mailed dbx. Guess what? They sent me the well known docs we have and some broken website links... Wonder if they really know what I was talking about. In the end dbx probably trashed the schems.

analogguru

Re: dbx 162 schematic needed
« Reply #11 on: May 03, 2018, 05:42:54 PM »
Looking at these pictures:
http://www.musicgarage.fi/mods-repairs/dbx-162-compressor/

I am wondering why nobody (who has such a unit) takes usable pictures of the component and the track/solder side - tracing can't be so complicated....

pucho812

Re: dbx 162 schematic needed
« Reply #12 on: May 03, 2018, 10:41:29 PM »
Well I got the card to stop frying resistors at start up.  Bad transistor.
The unit has bipolar 15vdc at the opamps, so far so good. Now I can start to trace signals.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

pucho812

Re: dbx 162 schematic needed
« Reply #13 on: May 04, 2018, 05:37:38 PM »
found this an old thread...

Quote
2 VCAs 210, each has a quad of transistors wrapped in aluminum.

2 output amps 230, each has two beefy power transistors and a (bootstrapped) opamp.

1 Dual RMS Detector 225.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

pucho812

Re: dbx 162 schematic needed
« Reply #14 on: May 07, 2018, 02:13:18 PM »
recap of the PSU and I +/-24VDC which feeds the output cards. according to the schematic of the main board that is correct.  I noticed I have different sets of transistors on each ouput card.  I assume that is a mistake.  output card is also burning resistors again and the power transistors get real hot.

Anyone have a schematic for the output card?
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

analogguru

Re: dbx 162 schematic needed
« Reply #15 on: May 07, 2018, 03:38:21 PM »
.....
Anyone have a schematic for the output card?
Anyone has usable pictures of the component and the track/solder side of the output card ?

pucho812

Re: dbx 162 schematic needed
« Reply #16 on: May 07, 2018, 07:56:17 PM »
Anyone has usable pictures of the component and the track/solder side of the output card ?

I can take some...
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

psych60s

Re: dbx 162 schematic needed
« Reply #17 on: May 08, 2018, 03:42:34 AM »
If you have some time pucho you can take some pictures of the component and sodler sides of all the daughter cards. We'd be able to trace a schematics from that I think

analogguru

Re: dbx 162 schematic needed
« Reply #18 on: May 08, 2018, 05:08:49 AM »
I can take some...
So what are you waiting for ?

pucho812

Re: dbx 162 schematic needed
« Reply #19 on: May 08, 2018, 02:16:15 PM »
output card
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


 

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