My Tascam 38 VU meters acknowledge signal input when in "INPUT" mode when it wants to. The channels that do register signal on inputs in "INPUT" mode sometimes do not playback in "SYNC" or "REPRODUCE" modes; there appears to be no signal from the channels on which I just recorded OR some channels play back in one mode and not the other OR the VU meters acknowledge a signal present but I can't hear it's output. What seems to be the problem? Thanks guys.
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That complexity of the unit can not be repaired remotely. It needs to go to a Technician that is capable. Teac people that are still in the business are Russ at New Jersey Factory Service and Skywave Tape Deck repair in Chicago area. I am the Skywave guy.
First this is a large unit with a separate power supply. Check all fuses and make sure all cables are plugged in. The manual can maybe be obtained from Stereomanuals.com This is where I get manuals when I don't have them.
The mic input on some units is just a one or two transistor circuit and the non use of the Mic connector for a long time can result in the contacts being tarnished. Also you need to use a Dynamic mic that has the appropriate connector. Some people buy adapters for mics and give no thought that the adapter is wrong. So there are a lot of things that can be stopping the mic input from working. Also you need to have the unit is record pause mode to see the input type signal most of the time.
It is hard to guess what is causing this but for all of the gain to be reduced like that either the deck has seen some really high input signal in the past that blew out some amplifiers or that there is a power supply component that has taken the input electronics down. I suspect that you will need to have a Technician look at it. If you are near Chicago, I may be your answer, I have been working with these Teac units for 40 years and was a Lead Tech at Chicago Factory Service in Arlington Heights. I can be reached at email@example.com If you are far off- I have other people that can do the job one in New Jersey and a few others.
Chances are that pre-amp IC that controls both channels has failed. Follow the wires from the tape head and trace the signal. Better still start with the output of the deck and trace backwards. If you touch the audio circuit with an insulated screwdriver (don't short anything) it should buzz. when you find something that buzzes on one side (coming out) but doesn't buzz on the otherside (signal going in) then you have found what needs to be replaced.
PS don't touch the power section.
Follow the left channel lead to where it joins with the PCB. Use a pointed tool and prod connections if you get a buzz then that stage in the amp is working. I suspect you will find it leads to a IC that might cause the fault. If you find it buzzers on the right but not left, then it's gone. PS don't short pins. If you can get hold of a signal injector it will make things easy.
Be careful and good luck.