| Author |
 Topic  |
|
|
al.cxam
Copper Member
United Kingdom
3 Posts |
 Posted - 09/18/2005 : 13:15:49
|
Hi folks
I have a Boss DD-3 (the one with the BIG chip) that has lain unused for a few years... I recently decided to get this out and use it again, but to my dismay, the thing is not giving any effected output. It lights up as it should in all modes, but all I can get is the straight through sound - there doesn't seem to anything obviously wrong/broken on the board!
Can anybody give me some suggestions as to where the problem lies and how I might go about solving it?
cheers - Al |
Edited by - al.cxam on 09/18/2005 13:18:20 |
|
|
bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 09/18/2005 : 13:27:31
|
In your post on jemsite you mentioned two loose wires. Have you got those soldered back in again?
These units usually never breaks so I would start by looking for more loose wires. Cold solder points could also be a problem. Look over the PCB and see if there's any solder points that looks cracked.
|
 |
|
|
al.cxam
Copper Member
United Kingdom
3 Posts |
Posted - 09/18/2005 : 13:37:05
|
Yea, it turns out the two wires are the direct output: 16&18 from the board, identified from a DD-2/3 schematic I found on this forum! (and I must have just clipped these deliberately as I have this pedal 'built-in' to a 19" rack unit - I was young and stoopid when I did it...).
The rack unit holds a CE-3 and the DD-3. Signal goes into the DD-3 which then feeds the CE-3 which supplies the stereo output - I guess that this is why the direct output from the DD-3 was bypassed....
So the loose wires were a red herring, and I'm not getting any effect from the device. |
|
|
|
bossarea
Forum Admin
United Kingdom
3652 Posts |
Posted - 09/18/2005 : 16:43:44
|
Troubleshooting won't be easy then. Have you got a scope and a signal generator? I would start by checking if we have a analog signal out of the DA converter. Pin 3 of the the 5218 opamp called 3a should be a good place to start.
If the DA converter outputs the signal correctly you can follow it through the circuit to see where you loose it. basis Q10 - emitter Q10 - emitter Q9 - expander pin 10 and 12 - Q8 - C13.
If there's no signal out of the DA converter then see if we have an anlog signal on the AD converters input. That would be pin 7 of the compressor (NE570). If you don't have signal in then follow the signal towards the input and see where it's lost. pin 5 NE570 - Q6 - Q4 - Q3. We already know you have the signal on the output of 1b because that's where the direct signal is taken from.
If you have the signal in to the AD converter but nothing out of it, it looks grim. The main thing between those two points is IC7. |
|
|
|
al.cxam
Copper Member
United Kingdom
3 Posts |
Posted - 09/18/2005 : 19:39:45
|
Boss - thanks for the helpful suggestions - unfortunately I dont have any test gear, so I think it's going to be a case of close scrutiny of the joints and a prayer in my heart! If I'm able to make any progress, I'll post the outcome!
Al |
|
|
|
steve-o
Copper Member
Australia
1 Posts |
Posted - 03/11/2006 : 08:56:04
|
| I have a similar problem to this. I just bought a DD-3 second hand and tried it out with a battery and it worked fine. When i brought it home and plugged it in with an adaptor the light would come on but no effect. My adaptor is not a Boss one, just a 9V DC adaptor that has worked with every other Boss pedal I have used. I tested the adaptor and found it was putting out 13V. I also used wires to connect the adaptor through the battery connection and it did the same as connecting the adaptor normally. Would there be something in the pedal that stops it working with the extra voltage? |
|
|
|
phostenix
Gold Member
USA
754 Posts |
Posted - 03/12/2006 : 20:13:22
|
What adapter are you trying? What info is there on the adapter regarding voltage, ac or dc, polarity of the plug, etc.?
Grace and peace,
Steve
|
|
|
| |
Topic |
|
Boss DD-3 problem..
