Display; Switch Panel - JRC JRL-2000F Service Manual

2.8 CML-334 Display
The CML-334 display is attached to the back
of
the front panel and is equipped with 2-
digit 7-segment LED which displays the frequenciy, a LED which indicate transmit
state, photosensor for theinfrared remote control signal and other peripheral circuits.
The LED DATA and SCAN signalslight CD1 dynamically. The LED DATA and SCAN
signalsarealso sent to the CSD-387 switch panel. TR1 to TR4 are drivers which
provide 5 V to light LED.
R11 and R12 are resitors which Iimit the current of the LED DATA signal.
IC1 is a driver with open-collector output.
CD2 is a photosensor for the infrared remote control signal and the output is TTL
Ievei. The output signal is processed by the CDJ-1143 control CPU.
TR5 and TR6 are drivers which provide 5 V to light LED on the CSD-387 switch panel.
2.9 CSD-387 Switch Panel
The CSD-387 switch panel is attached to the back of the front panel and consists of
13 switches and 15 LEDs.
The LED DATA and SCAN signalslight CD1 to CD9 and CD12 to CD16 dynamically.
CD11 lights up statically.
The states of S1 to S13 are read by SCAN and SW DATA signals. The signals read
are processed by the CDJ-1143 control CPU.
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