Service manual

38 Calibration Welch Allyn Propaq Encore Vital Signs Monitor
5. Reposition the tube to view the brightest area (now dim) and simultaneously a lighted
area (pixels on). Adjust RP7 clockwise until the background area just begins to
illuminate.
Main Power Supply Adjustments
The following procedures assume you are continuing from the recharger board calibration.
If not, refer to the setup procedures provided at the beginning of this section.
1. Turn off the monitor.
2. Remove the metal shield from the analog board. (Note the two different screw sizes;
refer to “Repair Procedures” on page 47 for instructions, if necessary.)
3. Connect the DMM reference lead to TP39.
4. Connect the DMM positive lead to TP29.
5. Turn on the monitor.
Press any of the lower five buttons to reset the Encore following equipment alerts.
6. Adjust RP7 to 5.000 V ± 0.010 V dc.
7. Refer to the table below and check the dc supply voltages using the DMM.
Table 11. Main Power Supply Voltage Checks
Supply Voltages Ref. Lead Pos. Lead Voltage Limits
Non-isolated
+15 TP39 TP3 +14.7 to +15.3
–15 TP39 TP11 –14.8 to -15.5
Isolated
+VR TP43 or TP1 TP9 +4.91 to +5.09
+VS TP43 or TP1 TP5 +6.58 to +7.15
–VS TP43 or TP1 TP21 -6.65 to -7.15
TP1
TP3
TP11
RP7
RP4
TP29
RP6
TP39
TP27
TP25
TP33
TP31
TP23
TP13
TP9
TP17
TP15
TP7
TP5
RP2
TP35
TP49TP47
TP41
U109
(DAP)
TP43
TP21
P6 PIN 10
P1
J4
J4 PIN 26
PIN 1
U1 U3 U5
0696-09
TP 19
U55
RP5
PT1
TP51
TP45
P5
PIN 1
TP37