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9600 Service Manual - gmecorp-usa.com

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Workstation Control 25<br />

IR RECEIVER PCB<br />

Assy. #00-874222 - Sch. #00-874220<br />

The Infrared Receiver PCB consists primarily of IC U1, an infrared preamplifier<br />

configured as a narrow band amplifier. The Infrared Receiver PCB assembly is housed<br />

in a metal box that is located between the monitors on top of the Workstation.<br />

Transmitted data from the IR Remote Control is detected by infrared diode CR3 and is<br />

applied to the IR pre-amp U1-1. The negative going pulses of U1-9 are inverted by<br />

transistor Q1 and applied to pin 1 of opto-isolator U9 on the Control Panel Processor<br />

PCB. These data pulses (measured at TP 5) are then sent to microcontroller U5 pin 15<br />

through AND gate U3. Microcontroller U5 then passes the data to the 386 AT<br />

Motherboard as discussed in the Control Panel Processor PCB serial <strong>com</strong>munications<br />

section.<br />

By tuning L2 and C8, the frequency of the IR receiver circuit is tuned to 53.3 Khz on<br />

newer style controls and 37.9 Khz on older style controls.

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