Arion SAD-1 Repair help

[tomcor33]

I just acquired a Arion SAD-1 Analog delay with MN3205 chip.
The unit looks to be in good shape. I get no sound coming out either bypassed or on mode.The unit is getting power to most Elec caps on the board. There are quite a few Elec Caps on the board, do you think maybe has a bad cap somewhere? I have the schematic for it. What would be the best way to start troubleshooting this unit? Pull and check all diodes and Elec caps. Check output and input voltages to IC's? This is a 1980's effect is it possible a chip has gone bad , like the delay chip? All solder connections look good, but I could maybe go through and resolder any iffy looking connections. I didn't see any iffy  on my close inspection of the board.
Any Ideas?

Also how do I post an image in a post here?

[tomcor33]

Schematic

http://wooee.com/pics/Arionsad1.gif

[ADR]

I have a SAD-1 as well. I can't help ya too much in the specific trouble shooting, but I'm curious as to the outcome of this.

I've noticed on my SAD-1 that the repeat or regen pot can be funky, sometimes during playing, it'll just go back to single repeat and then have to stop playing, give the pot a wiggle and it'll be back. Probably a bad pot.

The moral of this, check all pots, jacks and switches first before diving into the components. Chances are it's a bad jack if yer getting no sound at all. Hairline breaks in solder joints are common for stuff this old, and really need a magnifying glass to identify. Reflowing the solder should do it.

Ideally, what I plan to do is rehouse the SAD-1, and give it fresh pots and jacks.

[tomcor33]

I soldered most of the connections on the board carefully. I checked the continuity of the jacks with a cord plugged into all jacks. I just get no sound whatsoever. If I set the switch to Direct instead of stereo and plug into Output jack 2 I get clean sound with no effect. But Output 2 is only used in stereo mode. The SAD looks to be in very good shape, the case has very little abuse. Doesn't look like it was played much for being 25 years old. I have done electronics for many years. I guess I need to start at the input and trace the circuit. I am just wondering if it might be a bad delay chip.

[Dan N]

If you are not getting anything in bypass mode, then don't worry about the delay chip at this point.

Look at the schematic. The bypass switch just closes that FET to allow the delays to be mixed into the output. In or out, you should be getting signal out from both outputs (with power, of course). Tracing is a good plan.

Here's a layout that may come in handy:

http://experimentalistsanonymous.com/diy/Schematics/Delay%20Echo%20and%20Samplers/Arion%20SAD-1%20layout.gif

Good luck!