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Troubleshooting a Tascam 22-4 playback issue

I owned this reel-to-reel machine from when I purchased it new years ago. I want to restore it.
One issue I'm having is when playing back recordings I'm not getting audio out of track one. The VU meter shows audio is present. Other tracks are fine.
If anyone can provide some tips to for finding the root cause of failure that would be appreciated.
Thanks,
Paul

Troubleshoot Mackie 32x8 Master Section

We removed the Master section of Mackie 32x8 board for cleaning. There are two 7 pin (Power?) connectors that are interchangable and I managed to reverse them. Now, of course, the mixer does not work. Lights on the channel strips are on but the Master Section is dark. Any ideas what can be done to repair the mixer or at least start troubleshooting?

PreSonus Firestudio Troubleshooting

I have 2 Firestudio Projects hooked up to Behrskhg98y4winger powered speakers. Recently, the overall volume has significally decreased in the left channel. I am ruling out the monitors, because it affects the headphone outputs too. I messed around in the Universal Control settings, Windows Settings, Sonar settings, and ASIO settings.

Not sure where to turn to next.

Deciding what way to troubleshoot background hiss or grounding problem...

So, I have been working over the past couple of years intermittently trying to record both my guitar, and lately my voice, using my laptop and audio interfaces. I have always run into the same problem: background hiss and white noise.