Welch Allyn Model 408 - Manuals

2 5 Overview Purpose and scope This document provides instructions for disassembly and assembly, troubleshooting, functional testing and performance verification for the Micropaq monitor. This document covers the following monitors: • Micropaq Model 408 monitor, Masimo version • Micropaq Model 408 m...

6 Overview Welch Allyn Micropaq Monitor Technical support and repair services Contact Welch Allyn at one of the numbers listed on page ii . Returning products To return a product for service, contact Welch Allyn (see page ii ) and request a Return Material Authorization (RMA) number. When requesting...

Service Manual Overview 7 • Put the monitor, enclosed in a plastic bag with a packing list , into the original shipping carton with the original packing materials or into another appropriate shipping carton. • Write the Welch Allyn RMA number with the Welch Allyn address on the outside of the shippi...

8 Overview Welch Allyn Micropaq Monitor Connectors, indicators and controls SpO 2 Connector ECG Connector Visual Alarm Indicator Liquid Crystal Display Battery Snapshot Key Scroll Up Key and Reset Patient Alarm Tone Key Scroll Down Key and Main Menu Key Select Key and Silence Patient Alarm/Equipment...

Service Manual Overview 9 Indicators Visual Alarm indicator Audible Alarm indicator Beeps to indicate a patient alarm, and beeps faster for life-threatening arrhythmia alarms. Beeps when the equipment needs attention. This beep tone is slower than the patient alarm tones. Volume can be configured at...

10 Overview Welch Allyn Micropaq Monitor Scroll Down and Main menu key • Scrolls down menus on the display. • Displays the Main menu. Select and Silence Patient Alarm/Equipment Alert key • Selects the choice highlighted on the menu. • During patient alarms, silences the tone at the monitor and Acuit...

3 11 Functional verification This procedure helps to confirm the proper operation of the Micropaq monitor. No monitor disassembly is required. The following equipment is required: Visual check Perform this check if the monitor is being serviced in the field by a biomedical/clinical engineer. 1. Veri...

12 Functional verification Welch Allyn Micropaq Monitor Power-up test 1. Disconnect any patient cables connected to the monitor and remove the battery (if installed). 2. Insert a fully charged battery into the monitor. During power-up, the monitor performs a comprehensive self test of software. If s...

14 Functional verification Welch Allyn Micropaq Monitor ECG and alarm indicators test 1. Turn on power to the ECG simulator and set the values as: • ECG waveform: Normal sinus rhythm • ECG rate: 80 beats per minute (bpm) • ECG size: 1mV amplitude 2. Power up the monitor by inserting the battery if i...

Service Manual Functional verification 15 9. Press to acknowledge the alert and suspend the alarm. 10. Verify the audio alert stops and the equipment alert is no longer displayed. 11. Reconnect the ECG cable from the monitor. 12. Increase the heart rate to 140 bpm on the patient simulator. 13. Verif...

Service Manual Functional verification 17 Network test Observe the screen and confirm that the network connection symbol appears (indicating that the monitor is communicating with the network). If the network connection is not yet established, wait a short time (60 seconds or less) and confirm that ...

18 Functional verification Welch Allyn Micropaq Monitor 5. Verify that the LED above the screen in the upper right corner of the monitor is blinking green. This indicates communication between the monitor and the Acuity system. Refer to the communication status symbols below, as they appear in the l...

22 Functional verification Welch Allyn Micropaq Monitor Network status The Network Status screen displays the current status of the monitor and its communication channel. RSSI Current RSSI (Received Signal Strength Indicator) value. Displayed as a negative number. Indicates the strength (in dBm) of ...

Service Manual Functional verification 23 For additional information, see “Radio troubleshooting chart” on page 29. Reset Radio menu For monitors containing a 5 GHz radio card, a concealed menu is provided that allows resetting the 5 GHz card’s configuration back to its factory default configuration...

24 Functional verification Welch Allyn Micropaq Monitor Resetting the radio to factory defaults The menu may be entered from either the Network Status screen or the Network Monitor screen. 1. Press the scroll down key to access the Main menu, and then repeatedly press until SYSTEM INFORMATION MENU i...

Service Manual Functional verification 25 Change the network name Use this procedure to change the network name assigned to the monitor. Changing a factory-defined network name To change the network name: 1. Press to access the Main menu, and then repeatedly press until SERVICE MENU is highlighted. ...

26 Functional verification Welch Allyn Micropaq Monitor 5. Press or to highlight the desired network name, and then press . The monitor turns itself off, and then turns on and seeks to connect to a FlexNet network with the new network name. Changing a custom network name If the current monitor netwo...

4 27 Troubleshooting Troubleshooting chart This troubleshooting chart includes system faults and equipment alerts related to possible internal failures. If other error codes appear, refer to the directions for use for information on the cause and suggested remedy for those errors. Caution Replace pa...

Service Manual Troubleshooting 29 Radio troubleshooting chart This radio troubleshooting chart applies issues specific to the Micropaq wireless patient monitor and is not intended for comprehensive troubleshooting of the Acuity system. To troubleshoot the Acuity system, refer to the appropriate ser ...

30 Troubleshooting Welch Allyn Micropaq Monitor Alert messages and display information Message and display information Possible cause(s) and suggested response LOW BATTERY The monitor will shut down in less than 30 minutes due to a low battery.• Replace the battery as soon as possible. VERY LOW BATT...

5 31 Repair procedures Introduction This section provides instructions for disassembly and reassembly of the monitor. Required tools and equipment • 3 in lb torque driver • 5 in lb torque driver • #1 Phillips screwdriver bit • Tweezers • Needlenose pliers • Kapton tape • Soft lens wipes • Scissors o...

32 Repair procedures Welch Allyn Micropaq Monitor Zero Insertion Force (ZIF) connectors The monitor uses flex cables and zero insertion force (ZIF) flex cable connectors. The flex cables are all marked with a designator number which corresponds to a PCB board designator. Flex cables and ZIF connecto...

Service Manual Repair procedures 33 3. Push the latching piece toward the connector body until it locks into place. Connector locations Connector (Main Board) Description Connects with Referred to on... J1 (ZIF connector) ECG (flex cable) External ECG connector (flex cable) page 37 J3 (ZIF connector...

34 Repair procedures Welch Allyn Micropaq Monitor Procedures Disassembly - Model 408 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34 Reassembly - Model 408 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42 Disassembly - Mode...

Service Manual Repair procedures 35 4. Remove the four screw covers in the battery compartment. 5. Remove all eight case screws. 6. Place the Micropaq display-side down and carefully lift the back case away from the front case, starting at the bottom. Removing the SpO 2 board 1. Remove the screws an...

38 Repair procedures Welch Allyn Micropaq Monitor 2. Slide the SpO 2 board out from under the two bracket hooks (shown at left in the illustration below). 3. Remove the SpO 2 board. Removing the rear case 1. Remove the ECG flex cables from connector J1 on the main board. 2. Remove the SpO 2 flex cab...

42 Repair procedures Welch Allyn Micropaq Monitor Reassembly - Model 408 Installing the display Refer to the illustration. s 1. Form a 45-degree bend in the end of the display cable. a. With needle nose pliers, clamp the flex cable just behind the exposed flex circuit trace. You will form the bend a...

Service Manual Repair procedures 53 Installing the SpO 2 board (Masimo models) This section covers installation of the SpO 2 board on Masimo models. For Nellcor models, go to “Installing the SpO 2 board (Nellcor models)” on page 54. 1. Attach the SpO 2 sensor cables to connectors J1 and J3. 2. Seat ...

56 Repair procedures Welch Allyn Micropaq Monitor 4. Place metal washers and screws in the locations shown below and torque to 3 in. lbs. Closing the case 1. Align the SpO 2 clip on the rear case with the slot on the front case. 2. Make sure the rubber gasket is lying flat in the groove of the front...

58 Repair procedures Welch Allyn Micropaq Monitor Attaching labels The screw covers and notched labels are part of the service fastener kit. The rear case, battery well, clear serial number cover (not shown below) and the blank serial number labels are included in the rear case service kit. 1. Apply...

Service Manual Repair procedures 59 Disassembly - Model 406 This procedure covers the Model 406 monitor with ECG only. Opening the case 1. Remove the batter y pack. 2. Remove the two rubber feet using tweezers. 3. Remove the two rubber screw plugs from the external case using a spudger or paper clip...

64 Repair procedures Welch Allyn Micropaq Monitor Reassembly - Model 406 Installing the display Refer to the illustration. s 1. Form a 45-degree bend in the end of the display cable. a. With needle nose pliers, clamp the flex cable just behind the exposed flex circuit trace. You will form the bend a...

6 75 Technical overview Feature summary The monitor is a patient-worn vital signs monitor for use by adult or pediatric ambulatory patients. • One or two ECG channels displayed • Up to 2 ECG leads displayed at the monitor:I, II, III, V, aV R , aV L , or aV F with 5-lead cable • Up to 7 ECG leads dis...

76 Technical overview Welch Allyn Micropaq Monitor Micropaq 406 ECG monitoring Micropaq 408 ECG monitoring and either of two pulse oximetry (SpO 2 ) monitoring options: • SpO 2 with Masimo SET technology • SpO 2 with Nellcor OxiMax technology Understanding Micropaq and the FlexNet Network The monito...

7 77 Field Replaceable Units This list includes field-replaceable service parts only. Product accessories are listed separately in Welch Allyn Products and Accessories (810-0409-XX), which is available from Welch Allyn Customer Service. The following table lists service kits and the included parts f...

A 79 Micropaq exploded view Front case Gasket Display Rear case 2-56 x 7/8 Pan head screws 4-40 x 3/8 Pan head screws 4-40 x 3/8 Pan head screws Rubber feet SpO2 connector clip/cover and screws Rubber screw plugs 2-56 x 3/16 Pan head screws Rubber cushions Main board and subframe assembly SpO 2 card...