Chapter 4 ELECTRICAL SIGNALS
UNI-5 Service Manual 4-1
ELECTRICAL SIGNALS
4.1 MAIN BOARD (PK-270)
Before replacing the main board PK-270, make sure to turn ON the battery switch and every switch 1
is turned OFF.
XJ16
No. Signal Name Direction Opposite Side
1,2,5,7,9,11,14,
16,18,25,26,40
GND
-
PK-261(XJ3)
3,4 DC+5V power supply for LCD →
6,8,10,12,13,
15,17,19,20
LCD control signal
→
21,22 AC power supply for LCD -
23 DC-10V power supply for LCD -
24 DC+15V power supply for LCD -
27
DC+15V power supply for LCD backlight
-
28,29 Light control signal for LCD backlight ←
30 External buzzer signal →
31 NC →
32,33 DC+5V -
34 - 39 Membrane key control signal ←→
XJ20
No. Signal Name Direction Opposite Side
1 - 14 Debug signal ←→ Unused
4
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