Hi all,
I'm hoping there are some generic aspects to this issue that someone can help me out with.
FFW and RW switches are working on my Sony TC-510-2 however when I engage Playback, nothing happens.
I've been looking at the unit, the schematic and the layout and trying to piece together what is going on.
The PLAYBACK know is attached to two switches as below.
S15 leads to the Servo Amp board and S16 is for timing:
The Layout diagram looks like this:
Wire <28> is 14V from the power supply. When PLAYBACK is engaged the little button on the left of the switch is released.
Now the trouble is, when I probe all three pins, whether PLAYBACK is engaged or STOP (i.e. either position of the switch) ALL 3 pins on that switch read 14V (though when I probe resistance there is about 100 ohms or so)
Following the important wire <67> leads to the Servo Amp Board and I've highlighted exactly where that wire goes. Now my understanding of circuits gets hazy here. There's a transistor, but according to what I probed at the mechanical switch, that highlighted yellow wire is always at 14V. So the switch appears to not have any effect. Where I get confused is two things:
I can't tell firstly what the effect of switching between PLAYBACK and STOP should be from the diagrams above? Should wire <67> be 0V at STOP and 14V at PLAYBACK, or is it the other way around?
Secondly, if PLAYBACK should be 14V, and somehow the mechanical switch is faulty and leaving it "on" all the time, why is the servo motor not running?
Thank you for your help!
I'm hoping there are some generic aspects to this issue that someone can help me out with.
FFW and RW switches are working on my Sony TC-510-2 however when I engage Playback, nothing happens.
I've been looking at the unit, the schematic and the layout and trying to piece together what is going on.
The PLAYBACK know is attached to two switches as below.
S15 leads to the Servo Amp board and S16 is for timing:
The Layout diagram looks like this:
Wire <28> is 14V from the power supply. When PLAYBACK is engaged the little button on the left of the switch is released.
Now the trouble is, when I probe all three pins, whether PLAYBACK is engaged or STOP (i.e. either position of the switch) ALL 3 pins on that switch read 14V (though when I probe resistance there is about 100 ohms or so)
Following the important wire <67> leads to the Servo Amp Board and I've highlighted exactly where that wire goes. Now my understanding of circuits gets hazy here. There's a transistor, but according to what I probed at the mechanical switch, that highlighted yellow wire is always at 14V. So the switch appears to not have any effect. Where I get confused is two things:
I can't tell firstly what the effect of switching between PLAYBACK and STOP should be from the diagrams above? Should wire <67> be 0V at STOP and 14V at PLAYBACK, or is it the other way around?
Secondly, if PLAYBACK should be 14V, and somehow the mechanical switch is faulty and leaving it "on" all the time, why is the servo motor not running?
Thank you for your help!
Try posting at Reel To Reel - Tapeheads Tape, Audio and Music Forums. Lots o' Sony R2R experts there. Also would be helpful if you posted the appropriate schematic.