Help Tracing lost signal

[Connor2303]

Hello all,

My Roland Space Echo Re-201 has an issue, and i’m struggling to troubleshoot. When I have an input plugged into the J3 instrument jack, when the SW3 switch is set to ‘Echo’, there is no dry/direct sound outputted. Please can someone help trace where this dry signal goes on the schematic? The echo signal is outputted on this setting, but just not the dry sound. I’ve been trying to trace, but i’m finding the schematic confusing. Ive been inputting a 1k square wave and tracing with a scope from the OP 13 board to the OP 14B board, i will attach.

I have changed all the electrolytics and this hasnt fixed the issue. I suppose it must be simething else, transitor etc. sometimes when i put a loud signal through it, then the direct appears, which makes me think transistor?
Any help or advice is appreciated, Thank you,

 

[turk 182]

when the SW3 switch is set to ‘Echo’, there is no dry/direct sound outputted.

correct

 

[Connor2303]

The ‘echo’ switch setting should output a blend of the dry and echo sound, the ‘normal’ switch setting is just the dry (obviously). But on this machine for some reason, the echo setting only outputs the affected sound, (like the PA input).

 

[turk 182]

have you verified that the switch built into the "PA" input jack is functioning correctly? cleaning with a good quality contact cleaner or replacing it may resolve it.

 

[weltersys]

The ‘echo’ switch setting should output a blend of the dry and echo sound, the ‘normal’ switch setting is just the dry (obviously). But on this machine for some reason, the echo setting only outputs the affected sound, (like the PA input).

Sounds like you may have the "Echo Volume" pot set fully clockwise, in which case the PA, instrument and mic inputs would only output the echo effect, not the dry ("straight") sound to the machine's output jack.

Check the effect the "Echo Volume" pot has on each input.