Schematic diagram for Tascam 22-4

[vlad1980]

Hi,

I need help with the detailed schematic diagram for Tascam 22-4.
I cannot find it and maybe anyone can help me.

I have a problem with one channel and the defect is on Rec/Play PCB. I need the detailed schematic diagram.

I found one on Elektrotanya but is not a detailed one.

Thank you for your help.

 

[JonSnell Electronic]

Clean the record switch/relay contacts.

 

[vlad1980]

Thank you for your advice, the problem is on this Rec/Play PCB.

I exchange channels REC/Play PCBs and is clear that the problem is on this PCB.

 

[JonSnell Electronic]

Have you checked the function relay and record relay .... there is where your issue will be.

 

[vlad1980]

When I switch the PCBs (CH1 with CH2) the defect is moving to. So the problem is on this Rec/Play PCB CH1

 

[JonSnell Electronic]

The bias is flowing through the relay contacts to the erase head properly or not.

 

[vlad1980]

Yes, it seems that relays are ok.

I have an oscillation on CH1.

 

[JonSnell Electronic]

Not a lot more to be said without me working on it.
I would check Ch2 against Ch1 to see what is wrong.
Good luck.

 

[vlad1980]

Thank you very much for your support.

Also for me is difficult without schematic diagram.

I've ordered a PCB to replace the Rec/Play CH1.

 

[ralphfcooke]

The info you need should be here, you will need to create a (free) account

Tascam 22-4 - Manual - Tape Recorder/Reproducer - HiFi Engine

 

[Douglas Blake]

When I switch the PCBs (CH1 with CH2) the defect is moving to. So the problem is on this Rec/Play PCB CH1

Compare the two boards ... you have a good one, so use it to get readings to troubleshoot the other.

 

[vlad1980]

The info you need should be here, you will need to create a (free) account

Tascam 22-4 - Manual - Tape Recorder/Reproducer - HiFi Engine

Yes, most probably but my country is banned on hi-fi engine due to some users.

Please, if you have an account please download and send me the file.

Thank you

 

[vlad1980]

Problem solved, PCB replaced.

Thank you all for your advice and help.