Yamaha T-7 Tuner Output Assistance needed, please…

[wajobu]

Hello all. I recently purchased a very nice looking Yamaha T-7 Tuner (successor to the T-1—probably the same era as the CR-xx40 receiver from the looks of it). It practically looks brand new.

The buttons, LEDs, lights, tuning, etc. all work. Even with a minimal antenna this tuner seems to tune in stations quite well on both AM and FM. The one puzzle (that I knew about when I bought it) is that at both the fixed and variable outputs (same variable output knob below the faceplate like the T-1) do not work for AM and FM, but they do work just fine for the Record Calibration tone…curious. With headphones, I can hear AM and FM just fine with the volume control at about 11 o’clock, but it’s faint. :scratch2:

I don’t yet have a T-7 service manual (I do have a T-1 though), but do any of you vintage gurus have any thoughts on where I might start before I open the box? Many thanks in advance.

 

[the-real-mandak]

For tuner info go: http://www.fmtunerinfo.com/
This is direckt to the Yamaha's: http://www.fmtunerinfo.com/yamaha.html

It is all there.

Oh and the manual is here:http://www2.yamaha.co.jp/manual/pdf/av/english/AFT/T-7.pdf

 

[wajobu]

Thanks TRM...I have sent for a T-7 Service Manual. I think that I will move this thread to the Tuner Section (hmm...if that's possible).

 

[rosepretty37]

I purchased DSP-A2070 in early 1990 work excellent, no problem yet, but after we relocated in 2001, I gave to my parents and setup for them just for basic VCR and CD and tape sources. My parent did uses oscationally, until 2003 I visited my parents and found out that the source switch does have problem when activate switch from remote. like VCR1, VCR2 the noise creep up through speaker. Now 2006, I took it with me to my house. Disassemble the front panel, and now seeing all small circuit boards. The switch is motorize, attaching to great deal of circuits-boards. What I need now is looking for Yamaha parts department. And ask them how much does this part cost with shipping. Or per hap what is the real solution here?

 

[Raynald]

Common problem with that motorized selector switch. Search threads about the RX-550, it used the same switch and some folks here have worked on them. Hope the one in my DSP-A1000 does not act up. Of course I only use the 3 main power amps, so I would probably not even notice if it went.

 

[merrylander]

There are two muting transistors in the T-7 output and the big IC that controls them has been known to fail. One that went throught here was 'fixed' by simply removing a resistor, clearing the voltage that shut them off. Result was no muting ever but at least sound came through.