York YK-EP Operation And Maintenance Manual page 262

Table 212: Power supply test points
Voltage Test point
+5VDC TP3
+12VDC TP4
-12VDC TP33
+24VDC TP35
+3.3VDC TP2
VCC TP15
+5VA TP10
Battery n/a
Figure 90: Microboard lamp dimmer circuit
5.0 VDC
JP8
10 K
JP7
Note:
1. J6-6 not connected (N.C.) to Backlight Inverter Board when display is manufactured by
Sharp or NEC.
2. The position of Program Jumpers JP7 and JP8 determine the output at J6-7; In = Variable
Voltage; Out = Variable Resistance. Refer to Program Jumper Listing for applications.
3. Potentiometer is actually an integrated circuit that is the electrical equivalent of a 10KΩ
potentiometer.
262
Voltage
Fuse
range
+4.92 to
F1 (5A)
+5.28VDC
+11.58 to
F2 (5A)
+12.5VDC
-11.5 to
F3 (5A)
-12.5VDC
+22.4 to
F4 (4A)
+26.7VDC
+3.25 to
n/a
+3.43VDC
+4.92 to
n/a
+5.28VDC
+4.95 to +5.05 n/a
+2.95 to +3.45 n/a
J6
6
BRIGHTNESS CONTROL (+) OR (N.C.)
7
BRIGHTNESS CONTROL (WIPER)
8
BRIGHTNESS CONTROL (-)
LED
CR56
CR57
CR58
CR59
CR62
n/a
CR61
n/a
TO
BACKLIGHT
INVERTER
BOARD
LD22054
YK-EP Style B Centrifugal Chiller