Digitech - PDS 1002 Delay  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
User avatar
ChrisFFTA
Breadboard Brother
Information
Posts: 99
Joined: 30 Dec 2007, 07:43
Been thanked: 3 times

Post by ChrisFFTA »

I bought an 'as is' one fo these the other day and it aint working... so... anywhere to source a schem for these pedals? Any help most appreciated.

User avatar
theehman
Diode Debunker
Information
Posts: 710
Joined: 16 Aug 2007, 16:52
Location: Clear Creek, IN
Has thanked: 98 times
Been thanked: 105 times
Contact:

Post by theehman »

Do you mean the PDS1002?
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

I have a non working unit and I would be very happy to see a schematic.

The direct sound is working OK, but the delayed signal and the hold status LED does not light on. It can be a number of things, but a scheme will be very helpfull. One thing I've changed was the memory RAM chip.

I give a look to search engines on the net from time to time with no success...

The Digitech never answer my emails about this matter.

User avatar
theehman
Diode Debunker
Information
Posts: 710
Joined: 16 Aug 2007, 16:52
Location: Clear Creek, IN
Has thanked: 98 times
Been thanked: 105 times
Contact:

Post by theehman »

Alex Frias wrote:I have a non working unit and I would be very happy to see a schematic.

The direct sound is working OK, but the delayed signal and the hold status LED does not light on. It can be a number of things, but a scheme will be very helpfull. One thing I've changed was the memory RAM chip.

I give a look to search engines on the net from time to time with no success...

The Digitech never answer my emails about this matter.
If you guys needs the PDS1002 schematic LMK and I'll post it. The first poster wrote "PS1002" so I need to confirm which one is needed.
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

Well, I just speak for myself:
Digitech PDS 1002, Digital Delay with Hold and max 2 seconds of delay time.

User avatar
theehman
Diode Debunker
Information
Posts: 710
Joined: 16 Aug 2007, 16:52
Location: Clear Creek, IN
Has thanked: 98 times
Been thanked: 105 times
Contact:

Post by theehman »

Alex Frias wrote:Well, I just speak for myself:
Digitech PDS 1002, Digital Delay with Hold and max 2 seconds of delay time.
Here you go. If you figure it out, please post. I've got one w/ the same problem.
Attachments
PDS1002.pdf
(415.43 KiB) Downloaded 1864 times
Ron Neely II
Electro-Harmonix info: http://electroharmonix.vintageusaguitars.com
Home of RonSound effects: http://www.ronsound.com
fx schematics and repairs

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

Be sure, I will so!

Thanks a lot for that.

User avatar
madbean
Information

Post by madbean »

I have one that I have been using happily since around 1990! I modded it to change the delay pot to an expression pedal.

Only thing lacking is a low-fi / analog mod for this thing.

User avatar
ChrisFFTA
Breadboard Brother
Information
Posts: 99
Joined: 30 Dec 2007, 07:43
Been thanked: 3 times

Post by ChrisFFTA »

awesome PDS1002 is what i meant... sorry!!!! thx sooooooo much. i hope this helps the tech

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

madbean wrote:I have one that I have been using happily since around 1990! I modded it to change the delay pot to an expression pedal.

Only thing lacking is a low-fi / analog mod for this thing.
Well, If it goes more low fidelity than it is originally, I think you will get a very trashy delayed sound. When the unit is on max delay time, the signal is already suffering of severe degradation. And as this unit uses a 571/570 type of com/exp plus the mencioned lo fi freq response, aliasing and clock noise, what we recognise as analog delay sound is there. It is a very strong point that moves me to get it fixed.

User avatar
ChrisFFTA
Breadboard Brother
Information
Posts: 99
Joined: 30 Dec 2007, 07:43
Been thanked: 3 times

Post by ChrisFFTA »

ok... good news. using the schem the tech found the prob! a busted IC. Thanks everyone!

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

Any chance you could inform wich one was substued?

User avatar
ChrisFFTA
Breadboard Brother
Information
Posts: 99
Joined: 30 Dec 2007, 07:43
Been thanked: 3 times

Post by ChrisFFTA »

Alex Frias wrote:Any chance you could inform wich one was substued?
will do, once i pick it up this weekend

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

As I am in a busy time this week I've found not a lot of time to investigate the unit. On the other hand, I observed the schem and I figered out some possible problems. One 4007 could be one...

User avatar
i51423
Information
Posts: 11
Joined: 13 Nov 2007, 00:52

Post by i51423 »

You sure it's not just the trimpots out of whack? Both my PDS 1002 and 20/20 showed up dead and had to be tweaked.

User avatar
rossowj
Information
Posts: 2
Joined: 22 Jul 2010, 19:31

Post by rossowj »

Not to bring back a realllyyyy old thread or anything, but....I am having the same exact problem with my PDS 1002:

The dry signal is fine, but the wet signal is non-existant
and the Infinite Repeat function and LED arent working

any ideas?

User avatar
klaus83
Information
Posts: 1
Joined: 21 Aug 2010, 22:34

Post by klaus83 »

The dry signal is fine, but the wet signal is non-existant
and the Infinite Repeat function and LED arent working
Hmm, sort of the same problem here too. No wet sound, but my LEDs do light up. Cleaned the pots and reseated all ICs, to no avail. I'll have to check out the schematic. If there's a common problem on these pedals please share. :)

User avatar
Steven_M
Resistor Ronker
Information
Posts: 386
Joined: 06 Jul 2009, 19:50
Has thanked: 59 times
Been thanked: 35 times

Post by Steven_M »

klaus83 wrote:
The dry signal is fine, but the wet signal is non-existant
and the Infinite Repeat function and LED arent working
Hmm, sort of the same problem here too. No wet sound, but my LEDs do light up. Cleaned the pots and reseated all ICs, to no avail. I'll have to check out the schematic. If there's a common problem on these pedals please share. :)
Yep. I am in the same boat. Led's light up, dry signal sounds fine, but no wet signal. Got it for $25 so I cant complain.

User avatar
rossowj
Information
Posts: 2
Joined: 22 Jul 2010, 19:31

Post by rossowj »

ok well if one of you guys figure it out. please share the solution. thanks!

User avatar
Alex Frias
Resistor Ronker
Information
Posts: 270
Joined: 19 Dec 2007, 16:05
Has thanked: 10 times
Been thanked: 14 times

Post by Alex Frias »

I tried to replace every soqueted IC in this thing and nothing changed in a positive way...so...
Maybe next weekend a friend will help me with his oscilloscope. Let´s see, if I find somthing I will share it, be sure!

Post Reply