Daewoo DVR-G892 VCR Jog-Shuttle Control

[German_EE]

My young apprentice and I have just had ninety minutes fun doing a destructive teardown on a Daewoo VCR. The jog-shuttle control looks too good to waste but I have no idea of the pinout. Does anyone have access to the service manual so I can find out the connections?

[dom0]

If it has few pins (six-seven or so) the jog-ring-thingy is a pot and the shuttle is a normal quadrature encoder. There are also "pure digital" ones with a few more pins where the shuttle is a quadrature encoder and the jog-ring-thingy is a grey coder.

[German_EE]

There are five pins on the control and this is expanded to eleven connections going out of the PCB (although some of these are assigned to buttons). The only semiconductors on the PCB are diodes and there are no electrolytic capacitors to aid in power supply identification 

[dom0]

Five pins ... maybe GND is shared between the rotary encoder and the ring-thingy pot?

[SeanB]

You have the jog with the play and stop buttons in it?  If so then they are using a resistive matrix, with the play and stop keys in the one matrix, and the jog will have a set of matrix switches that control the various forward and reverse speeds in discrete blocks, with a spring centring the knob.

If you have the model number that will help in getting the manual.

[German_EE]

Further investigation (this is much more fun than German TV)

Pin 7 is the common pin on the PCB and leads to pin 4 on the encoder.
Pins 1,2,3 and 5 on the encoder are all connected to the anodes of diodes that eventually lead to pins 8-11 on the output. I think this thing may be just switches rather than a rotary potentiometer 

[SeanB]

Almost anything is more interesting than TV....... So you have a rotary encoder with either an inner ring that you rotate around, and an outer which is centred, and has a switch to say if the outer ring is being held forward or reverse. Inner ring will be a standard quadrature encoder unit and the outer will be 2 switches then.

[dom0]

That's interesting. I salvaged one from a video editor console and two from mazen (essentially studio / high end VCRs), they had a pot or a grey-coder for the outer ring thingy. Maybe this one here is more like a lower end variant of a jog/shuttle?