Yamaha MCR-330 Service Manual page 30

CRX-330/NS-BP100
7-5 DESTINATION (Destination detection)
The voltage at 94 pin of microprocessor (IC211) is displayed with 3.3V/255 as a reference.
7-6 KEY0 / KEY1 / KEY2
(Panel key of this unit detection)
The voltage at 97 pin (KEY0), 95 pin (KEY1) and 70 pin (KEY2) of microprocessor IC211 are displayed with 3.3V/255
as a reference.
When the A/D value of the panel key becomes out of the specified range, normal operation will not be available.
In this case, check the constant of voltage dividing resistor, solder condition, etc. Refer to table.
Display
0 – 16
17 – 48
49 – 79
80 – 111
239 – 255
30
Display
Destination
Ohm Key 0
0
+ 1.5 k PLAY/PAUSE
+ 1.8 k STOP
+ 2.7 k OPEN/CLOSE
∞ OFF
194 – 233
B
KEY2 (Not applied to this model.)
KEY1
KEY0
Key 1
INPUT
OFF
Key 2
OFF