Yamaha MCR-730 Service Manual page 34

DRX-730/NX-E700
KEY (K0)
When the A/D value of the panel key becomes out of the specified range,
normal operation will not be available. Check each panel key for the constant
of the voltage dividing resistance, soldered condition, etc, referring to the
table below.
(Reference voltage: 5 V = 500)
Key input for AD port
Pull-up resistance 10 k-ohms
ohm 0
V 0 - 0.2
Value 0 - 20
pin 89
OPEN/CLOSE
(KEY0)
9. PROTECTION HISTORY
The 5 protection histories are displayed.
Example
9 - 1 P 2 x x x x
Example
9 - 2 P 3 x x x x
Example
9 - 3 D C x x x x
Example
9 - 4 N O P R T
Example
9 - 5 N O P R T
9 - 6 C L E A R H I S T
34
+ 1.2 k + 1.2 k
0.3 - 0.7 0.8 - 1.7
30 - 70 80 - 170
PLAY/PAUSE STOP
Protection history 1
Protection history 2
Protection history 3
Protection history 4
Protection history 5
Protection history clear
Press the "OPEN/CLOSE" key, and the protection history will be initialized.
+ 7.9 k + 12.7 k
1.8 - 2.7 2.8 - 3.2
180 - 270 280 - 320
(SEARCH/SKIP -
and SEARCH/SKIP - SEARCH/SKIP +
SEARCH/SKIP +)
8 . K E Y : 5 0 0
+ 20.7 k ∞
3.3 - 4.2 4.7 - 5.0
330 - 420 470 - 500
KEY OFF