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29th December 2005, 04:17 AM
| #1 |
| Gear interested Join Date: Dec 2004 Location: Fullerton, California
Posts: 7
| dbx encode/decode pcb schematic needed I am troubleshooting an Marshall AR-300 Tape eliminator. This unit sports 2 encoder/decoder pc boards manufactured by dbx in 1982. The cards are 2.6" x 4.0" and use a 12 pin molex connector numbered 7 thru 18 on one long edge to make connections. There are 4 pots along the other long side of the board labeled "VCA sym", "Rec Level", "Play Level", "RMS Sym". There are 2 LM301A's, a 4558, a CA3046, a CA3083, a pair of transistors wrapped in tin-foil, and 3 fat tantalum capacitors, one of which on my 2 boards caught fire and looks like a toasted marshmallow. There is no obvious part number for the circuit board. The rear (solder) side has the dbx logo and the numbers 260174 06 near pin 18 (ground) of the connector and the letters CD-B1 near pin 7. This same board was also used in the Eventide 910 Harmonizer, and probably several other OEM devices that needed compression and expansion of dynamic range prior to processing. Can anyone out there 1. Help me identify a part number for this pcb? 2. Have a pinout of the board? 3. Have the schematic of the board? 4. Have the adjustment procedure for the board? Thanks,
__________________ Steve Hogan |
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5th July 2006, 04:54 PM
| #2 |
| Gear nut  Join Date: Jul 2005
Posts: 114
| I'm in the same box - but with the Eventide H910.
__________________ The Audio Trinity - Neumann, Neve, _ _ _ _ _ _ |
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6th July 2006, 03:37 AM
| #3 |
| Lives for gear Join Date: Oct 2004 Location: Burbank, CA, USA
Posts: 721
| Steve, we talked about this a while back. I think Steve Anderson and I finally unearthed one in some manual or other. Give us a call during business hours and we'll get a copy to you. I'll try to post it here for the benefit of others. David
__________________ http://studioelectronics.biz Service & Restoration of UREI dbx Eventide Marshall AMS Tube Gear and more |
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18th October 2006, 06:18 PM
| #4 | |
| Gear maniac  Join Date: Oct 2005
Posts: 163
| Did you ever find that? Quote:
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18th October 2006, 08:22 PM
| #5 |
| Lives for gear Join Date: Oct 2004 Location: Burbank, CA, USA
Posts: 721
| Thank Steve Anderson, he found it in our H949 manual.
__________________ http://studioelectronics.biz Service & Restoration of UREI dbx Eventide Marshall AMS Tube Gear and more |
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