Marantz MAR775 Easy jog knob, Rotary operation, Push button operation, IR receiver remote control

Easy jog knob

Rotary operation

The easy jog knob (SY26) incorporates a whole heap of user control possibilities in just one knob. Without the knob being operated, pin 1 and 3 of the knob (and thus pin 16 and 17 of the display controller), maintain the +5V level. Turning the knob clockwise briefly connects pin 1 to GND followed by pin 3.

PM3392

Pin1

Pin3

CL 96532076_023.eps 290799

Figure 8-6 ‘Turn clockwise’

Turning the knob anti-clockwise briefly connects pin 3 to GND followed by pin 1.

PM3392

Pin1

Pin3

CL 96532076_022.eps 290799

Figure 8-7 ‘Turn anti-clockwise’

The pulses created this way arrive at pin 16 and 17 of the display controller. The first pulse to arrive tells the controller the direction of the rotation. Counting the pulses reveals the amount of rotation. Combining and decoding this information, the display controller will execute the appropriate task.

Push button operation

This button connects to the key matrix lines and thus the operation is identical to the ordinary keys. Without being pressed, pin 4 of the easy jog maintains the low level, pin 5 the high level. When pressed the scanning signal goes through the closed contact of pins 4 and 5, and can be checked at both pins.

IR receiver - remote control

In the CDR570/930 the IR receiver RPM6934-V4 (ZY01) is mounted on the display board. In all versions the IR receiver connects to the display controller. The signal coming from the receiver can be checked at pin 22 of the display controller. This signal is normally high (+5V). When the remote control is being operated, pulses mixed in with the +5V can be measured. The oscillogram gives an indication of how the signal looks like with the RC being operated.