Service manual

Service Manual Calibration 37
Display Voltage Adjustments
The following calibration adjusts the monitor display’s high voltage supply which is located
on the recharger board. The factory-set voltage is specific to the display and is indicated
on the display module label.
If you know the voltage specified on the display label (i.e., are calibrating following an
installation) use Procedure 1, below. If you do not know the voltage, use Procedure 2.
Procedure 1
1. Install the display according to the procedures described in “Repair Procedures” on
page 47, reconnect the cables between the front and rear chassis, and turn on the
Encore. Note that when you turn the power on and off you initiate an equipment alert.
Press any one of the five bottom buttons to reset.
2. Connect the DMM positive lead to the D33 cathode.
3. Connect the DMM reference lead to ground at TP2.
4. Adjust RP7 to the value indicated on the display module label.
Procedure 2
1. Turn on the Encore and position the display for easy viewing.
2. Adjust RP7 clockwise until the background illuminates.
3. Find the brightest background area on the display and view this area through a paper
tube approximately 2 inches in diameter (such as a paper towel or tissue paper tube)
to shield the area from ambient light.
4. Adjust RP7 counter-clockwise until the viewed area fades to black.
Note
Do not adjust the display voltage unless the display has been changed and the
lack of contrast between illuminated and non-illuminated pixels affects the display
readability.
CATHODE D33
T3
VLV2
VLV1
VLV3
RP7
NIBP PUMP
P11
P10
P12
+BAT
TP1
P14
TP3
Q1
GND
TP2
OVR SET
TP4
PT2
RP5
RP3
PIN 1
RP1