Tascam 388 - Routing problems.

[fizzicato]

I'm having a routing issue with my Tascam 388:


When I try to route a channel using the assignment buttons, tracks 1 and 2 receive the signal from every other bus except their own. For example, if I assign a channel to Bus 3-4, 5-6, 7-8, or even the L-R master bus, that signal bleeds directly into tracks 1 and 2. However, if I specifically press the 1-2 assignment button, tracks 1 and 2 receive absolutely nothing.


Essentially, the internal routing for tracks 1 and 2 is doing the exact opposite of what it's supposed to do: it picks up all the traffic from the other busses but rejects its own.


Has anyone encountered a similar issue? Could this be a failing component on the program buss board, a bad op-amp, or perhaps dirty switches/grounding issues? Thanks in advance for any advice or troubleshooting tips you can share

 

[sweetbeats]

So you can’t get anything to PGM group 3-8 or to the L-R master buss?

How are you monitoring the signal? Are you monitoring through the monitor mixer?

Do the meters reflect the same thing you’re hearing? In other words if you assign an input to, for instance, PGM 3, can you see activity on the PGM 3 meter but just not hear it, or does meter 3 show no activity and instead meter 2 shows activity?

If you assign to PGM 3-8 can you get signal at the appropriate out at the PGM OUT jack or does everything come out PGM 1-2?

 

[fizzicato]

Uh, I'm not sure if I'm explaining myself well. I have a video recording of it, but I can't upload it. Period. Channels 1/2 only receive audio from the rest of the channel asignation bus but they don't receive their own 1/2 bus. They even receive the L/R audio bus send.

 

[sweetbeats]

I understand that implicitly. I’m asking you to do some troubleshooting steps to help narrow down where the issue is occurring. Are you interested in the help? There are multiple ways to monitor the output of the summing busses:

1. Via the monitor buss through the monitor mixer via headphones or at the MONITOR OUT jacks
2. At the PGM OUT jacks
3. Visually via the meters

These various means source signal at different points in the signal path, and if the issue exists in one place and not another then that can help pinpoint where the issue fault exists. Similarly if the issue is present in all these places that also can help steer where the problem is.

You can either help me help you, or I can make a wild-ass guess, which might result in a fruitless goose chase. I prefer the former.