Welch Allyn Tycos User manual

Service Manual
Aneroid Sphygmomanometers
PN 95P504 Rev A
Copyright 2000
Manuals
Operator Manual

Welch Allyn Inc. Aneroid Sphygmomanometers Service Manual
Revision A
Welch Allyn Inc. Page 2 of 40
Revision History
Revision Section Date Author Description
A All 8/31/00 JDB Introduction of Aneroid Service
Manual

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Revision A
Welch Allyn Inc. Page 3 of 40
Table of Contents
Section 1: General Information....................................................................................................................... 4
1.1 To Service Personnel ............................................................................................................................ 4
1.2 Tools and Equipment............................................................................................................................ 5
1.3 Test Specifications................................................................................................................................ 6
1.4 Test Equipment Bench Layout.............................................................................................................. 7
Section 2: Classic Pocket Aneroid Gauges ..................................................................................................... 8
2.1 Opening/Removing and Replacing Parts of the Pocket Gauge* ........................................................... 8
2.2 Calibration of the Pocket Gauge........................................................................................................... 9
2.3 Testing ................................................................................................................................................ 11
Section 3: Classic Hand Aneroid Gauge....................................................................................................... 12
3.1 Opening/Removing and Replacing Parts of the Hand Gauge*............................................................ 12
3.2 Calibration of the Hand Gauge ........................................................................................................... 13
3.3 Testing ................................................................................................................................................ 15
Section 4: Classic Wall and Mobile Aneroid Gauge..................................................................................... 16
4.1 Opening/Removing and Replacing Parts of the Wall and Mobile Gauge.* ........................................ 16
7670 series Wall and Mobile Aneroid. ................................................................................................. 16
Classic Wall and Mobile Aneroid......................................................................................................... 16
4.2 Calibration of the Wall and Mobile Gauge......................................................................................... 17
4.3 Testing ................................................................................................................................................ 19
Section 5: Economy Aneroid Gauge............................................................................................................. 20
5.1 Opening/Removing and Replacing Parts of the Economy Gauge*..................................................... 20
5.2 Calibration of the Economy Gauge..................................................................................................... 21
5.3 Testing ................................................................................................................................................ 23
Section 6: Silver Ring Hand Aneroid........................................................................................................... 24
6.1 Opening/Removing and Replacing Parts of the Silver Ring ...............................................................24
6.2 Calibration of the Silver Ring Hand Aneroid...................................................................................... 25
6.3 Testing of the Silver Ring Hand Aneroid............................................................................................ 27
Section 7: Pro Check Hand Aneroid............................................................................................................. 28
7.1 Opening/Removing and Replacing Parts of Pro Check Hand Aneroid............................................... 28
7.2 Calibration of the Pro Check Hand Aneroid....................................................................................... 29
7.3 Testing of the Pro Check Hand Aneroid............................................................................................. 31
Section 8: Pictures and Replacement Parts................................................................................................... 32
Section 8.1: Classic Pocket Aneroid Replacement Parts...........................................................................32
Section 8.2: Classic Hand Aneroid Replacement Parts.............................................................................33
Section 8.3: 767 Wall/Mobile Aneroid Replacement Parts....................................................................... 34
Section 8.4: Classic Wall/Mobile Aneroid Replacement Parts................................................................. 35
Section 8.5: Economy Aneroid Replacement Parts................................................................................... 36
Section 8.6: Silver Ring Hand Aneroid Replacement Parts...................................................................... 37
Section 8.7: Pro Check Hand Aneroid Replacement Parts........................................................................ 38
Section 8.8: Welch Allyn Tycos Movement ............................................................................................. 39
Section 8.9: Welch Allyn S+K Movement................................................................................................ 40

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Section 1: General Information
1.1 To Service Personnel
The information contained in this manual is subject to change
without notice and should not be construed as commitment by
Welch Allyn Inc.
Welch Allyn Inc. assumes no responsibility for any errors that
may appear in this manual. If the product and/or its operation
varies significantly from any description herein, please contact
the
Welch Allyn Inc. Technical Service Center
800-450-9275
[phone]
Fax [phone]
Welch Allyn Inc.
95 Old Shoals Road
Arden, North Carolina 28704
USA
This product has been designed to provide a high degree of
safety and reliability. However, Welch Allyn Inc. can not
guarantee against: deterioration of components due to aging,
normal wear, tampering, and abuse.
Warning: If in the course performing calibration or repair on the
gauge the device becomes inoperable and must be sent in to
the Welch Allyn Inc. Service Center, The warranty will not be
honored and you will be charge for all repairs.

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1.2 Tools and Equipment
The following is a list of the tools and equipment that is required to do
the repair and calibration of the aneroid gauges.
Tool Number Description
T106845A Calibration Tool
T105243A Pointer Removal Tool
T105243B Pointer Removal Tool
T107345 Span Wrench
T110657 Calibration Dial Adapter, Economy
T105721 Calibration Dial, Pocket and Hand Gauge
T112663 Calibration Dial, Walls and Mobiles
T106763 Calibration Stand (Wall Aneroid)
T112592 Calibration Dial (Silver Ring)
T105258 Wrench (Economy)
T108913 3/8” Open End Wrench
T108897 Movement Removal Wrench
T113265 Thumbscrew Wrench
T110543 Pliers to Grip Lure
T105644 Collet
T55804-1 Pocket Screw Cap Assembly
T108212 Economy Fixture
T107569 Hand Fixture
T74555 Pocket Fixture
T112655 Top Plate Wrench
T113249 Screw Cap Removal Tool
T112927 5/16” Open End Wrench
T112765 ¼” Open End Wrench
T34938 Pointer Block
T112511B Tweezers
T112726 Jewelers Screw Driver
T112595 Calibration Tool (Silver Ring)
“Disytest” Calibration Dial for Pro Check (Order From S+K)
T112833 Movement Removal Tool (S+K Movement)
T112653 Torque Wrench (S+K movement)
T112653A Adapter for Torque wrench (S+K Movement)
Test Equipment Description Other Tools Needed but
5088-01 Bulb and Valve Not Provided By Welch Allyn
T112854 500cc Volume 1. Small Hammer
9585TPK4 “T” Fitting 2. 5/8” Socket
9586TPK4 “Y” Fitting 3. ½” Socket
97P24 Pneumatic Tubing (4ft.) 4. ¾” Open End Wrench
200-2000IN Netech Digital Pressure Meter 5. 9/16” - 24 Thread Tap
“or” 6. ¼” - 40 Thread Tap
2270-01 Setra Digital Pressure Meter. 7. 7/16” - 36 Thread Tap
T111962A Tension Set Tool
T112459 Torque Screwdriver
T112459A Torque bit.

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1.3 Test Specifications
The following are the test specification for the Welch Allyn
Tycos Aneroid Gauge:
1. The gauge will be accurate to within +/- 3 mmHg* at the
following test pressures:
a) 0 mmHg (pointer inside the oval/rectangle)
b) 60 mmHg
c) 150 mmHg
d) 200 mmHg
e) 300 mmHg
* This accuracy is based on the use of a calibrated digital pressure
meter. If using a calibrated aneroid or mercury column for measuring
the accuracy of the aneroid in question the resulting accuracy is +/- 6
mmHg.

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1.4 Test Equipment Bench Layout
500cc Volume Digital
Pressure
Meter
Gauge
Under
Test
Figure 1.5

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Section 2: Classic Pocket Aneroid Gauges
2.1 Opening/Removing and Replacing Parts of the
Pocket Gauge*
1. Place the pocket gauge into the Pocket Gauge Fixture (T74555).
2. Remove the bezel by unscrewing it from the case and aside.
Remove the crystal and aside.
3. Remove the pointer by using the pointer removal tool (T105243A).
4. Pry out the dial by using a small flat head screwdriver.
5. Remove the locking nut using the span wrench (T107345).
6. Remove the screw cap using (T113249) and remove the capsule.
Note: the arm of the movement fits into the top of the capsule.
7. Remove the 2 screws that are holding down the gauge movement
using T108897 and remove the movement.
Reassemble in reverse order.
* - See section 8.1 for exploded view drawing for the Pocket Gauge.

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2.2 Calibration of the Pocket Gauge
1. Attach the pneumatic tubing of test equipment to the gauge.
2. Place gauge in to fixture (T74555)
3. Remove bezel, crystal, pointer and dial.
To set the tension:
4. Tighten all screws.
5. View sector gear and ensure proper position (i.e. right edge of sector gear
should align with mark on base of movement).
6. If sector gear not aligned properly, loosen the capsule nut using a 3/8”
wrench and adjust the sector gear by turning the capsule until sector gear is
in correct position per step 5. Tighten capsule nut.
7. Loosen sector stop lug and pull toward bottom of gauge.
8. Using your left index finger, push the sector gear all the way to the post and
hold that in position.
9. Place tension setting tool (T119628) onto pinion at the 9 o’clock position.
10. Rotate tool clock wise to the 3 o’clock position.
11. Release sector gear and continue rotation to the 6 o’clock position sector
gear should be moving during this step).
12. Bring lug back to correct position and lock into place.
To set the span:
13. Place Test Dial onto gauge. Place pointer onto pinion. Rotate dial until
pointer is at “0” at the bottom of the gauge.
14. Apply 320 mmHg to the Gauge.
15. Release pressure to 300 mmHg to the gauge.
16. If point is less than 300, Place the calibration tool (T106854A) into the radius
plate in slot above screw. Pull calibration tool toward bottom of gauge moving
the sector gear upward until pointer reached “300.” Release pressure and
check “0” point.
17. If point is greater than 300, Using the calibration tool (T106845A) positioned
between the sector gear and radius plate on the left of the movement, rotate
the tool clock wise until pointer is at “300” (this brings the radius plate down).
Release pressure and check “0” point.
18. If not at “0” upon release of pressure, rotate test dial until pointer is on the “0”
mark of test dial and re-apply 300 mmHg. Repeat steps 14-17 until span is
set.
19. Check for leak by pinching off the tubing from the test equipment while
pressure is on the gauge. There should be no visible leak.

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Check and finish calibration:
20. Remove the pointer and test dial, replace the gauge’s dial.
21. Place pointer onto pinion and resting in center of oval. Tap pointer with small
hammer slightly to secure.
22. Apply 320 mmHg to the gauge.
23. Release pressure to 300 mmHg and take readings here and at given points
(see section 1.3).
24. If pointer is greater than 300, pull pointer until you feel slight resistance
counter-clock wise, tap pointer with small hammer and recheck. Make sure
pointer returns to the oval each time. Repeat until satisfied.
25. If less than 300, rotate pointer 1 complete revolution clockwise until
resistance is felt. Push pointer a little farther and tap pointer with small
hammer and recheck. Make sure pointer returns to the oval each time.
Repeat until satisfied.
26. Place crystal and bezel back onto gauge and check.
 Please see Section 8.8 for a drawing of the Welch Allyn Tycos Movement.

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2.3 Testing
1. Hook up the Pocket Gauge that needs to be tested to the
pneumatic tubing of the test equipment.
2. Apply 320 mmHg to the gauges.
3. Release the pressure to 300 mmHg on the digital pressure meter,
or a calibrated aneroid or mercury gauge. Note: The aneroid or
mercury gauge must be accurate to +/- 3 mmHg at the stated
target pressures using a calibrated digital pressure meter. If using
a calibrated aneroid or mercury column the accuracy must be +/-
6 mmHg.
4. Check reading of the pressure meter or gauge to that of the
Pocket Gauge under test. Refer to section 1.3 for specifications.

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Section 3: Classic Hand Aneroid Gauge
3.1 Opening/Removing and Replacing Parts of the Hand
Gauge*
1. Pull bulb off of valve body (48S95).
2. Place the Hand Gauge into the Hand Gauge Fixture (T107569).
3. Remove the bezel by unscrewing it from the case and aside.
Remove the crystal and aside.
4. Remove the pointer by using the pointer removal tool (T105243A).
5. Pry out the dial by using a small flat head screwdriver.
6. Remove the cover of the Hand Gauge by unscrewing the two
screws (9P2651) with a Phillips head screwdriver.
7. Loosen the locking nut (32P527) from the capsule and remove
both from the case.
8. Remove the 9P1799 screws from the case and movement and
remove the movement from the case.
9. Remove the Thumbscrew by using tool # T113265 (Thumbscrew
wrench) and turning the thumbscrew counter-clock wise.
10. Remove the Thumbscrew valve body (42P252) using a 5/8”
socket.
11. Remove the valve body (48S95) from the case using a 1/2”
socket.
Reassemble in reverse order
* - See section 8.2 for an exploded view drawing of the Hand Gauge.

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3.2 Calibration of the Hand Gauge
1. Attach the pneumatic tubing of test equipment to the gauge.
2. Ensure that the valve of the gauge is closed. Place gauge in to fixture
(T107569)
3. Increase pressure on the gauge to 250 mmHg. Allow the pressure to stabilize
for 15 seconds. Check leak and ensure that the leak is no greater than 3
mmHg in 15 seconds.
4. Remove bezel, crystal, pointer and dial.
To set the tension:
5. Tighten all screws.
6. View sector gear and ensure proper position (i.e. right edge of sector gear
should align with mark on base of movement).
7. If sector gear not aligned properly, loosen the capsule nut using a 3/8”
wrench and adjust the sector gear by turning the capsule until sector gear is
in correct position per step 5. Tighten capsule nut.
8. Loosen sector stop lug and pull toward bottom of gauge.
9. Using your left index finger, push the sector gear all the way to the post and
hold that in position.
10. Place tension setting tool (T119628) onto pinion at the 9 o’clock position.
11. Rotate tool clock wise to the 3 o’clock position.
12. Release sector gear and continue rotation to the 6 o’clock position sector
gear should be moving during this step).
13. Bring lug back to correct position and lock into place.
To set the span:
14. Place Test Dial onto gauge. Place pointer onto pinion. Rotate dial until
pointer is at “0” at the bottom of the gauge.
15. Apply 320 mmHg to the Gauge.
16. Release pressure to 300 mmHg to the gauge.
17. If point is less than 300, Place calibration tool (T106845A) into the radius
plate in slot above screw. Pull calibration tool toward bottom of gauge
moving the sector gear upward until pointer reached “300.” Release pressure
and check “0” point.
18. If point is greater than 300, Using the calibration tool (T106845A) positioned
between the sector gear and radius plate on the left of the movement, rotate
the tool clock wise until pointer is at “300” (this brings the radius plate down).
Release pressure and check “0” point.
19. If not at “0” upon release of pressure, rotate test dial until pointer is on the “0”
mark of test dial and re-apply 300 mmHg. Repeat steps 14-17 until span is
set.

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Check and finish calibration:
20. Remove the pointer and test dial, replace the gauge’s dial.
21. Place pointer onto pinion and resting in center of oval. Tap pointer with small
hammer slightly to secure.
22. Apply 320 mmHg to the gauge.
23. Release pressure to 300 mmHg and take readings here and at given points
(see section 1.3)
24. If pointer is greater than 300, pull pointer until you feel slight resistance
counter-clock wise, tap pointer with small hammer and recheck. Make sure
pointer returns to the oval each time. Repeat until satisfied.
25. If less than 300, rotate pointer 1 complete revolution clockwise until
resistance is felt. Push pointer a little farther and tap pointer with small
hammer and recheck. Make sure pointer returns to the oval each time.
Repeat until satisfied.
26. Place crystal and bezel back onto gauge and check.
 Please see section 8.8 for drawing of Welch Allyn Tycos movement.

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3.3 Testing
1. Hook up the Hand Gauge that needs to be tested to the
pneumatic tubing of the test equipment.
2. Apply 320 mmHg to the gauge.
3. Release the pressure to 300 mmHg. on the digital pressure meter,
or a calibrated aneroid or mercury gauge. Note: The aneroid or
mercury gauge must be accurate to +/- 3 mmHg at the stated
target pressures using a calibrated digital pressure meter. If using
a calibrated aneroid or mercury column the accuracy must be +/-
6 mmHg.
4. Check reading of the pressure meter or gauge to that of the Hand
Gauge under test. Refer to section 1.3 for specifications.

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Section 4: Classic Wall and Mobile Aneroid Gauge
4.1 Opening/Removing and Replacing Parts of the Wall
and Mobile Gauge.*
7670 series Wall and Mobile Aneroid.
1. Remove the bezel from the case by prying the 4 tabs up and
pulling out on the bezel.
2. Remove the crystal and aside.
3. Remove the pointer by using the pointer removal tool (T105243B)
visually inspect, straighten and aside.
4. Remove the screws of the dial by using the torque driver
(T112459) and remove the dial and aside.
5. Remove the screws that are holding down the mount to the case
of the gauge by using a Phillips head screwdriver.
Reassemble in reverse order
* - See section 8.3 for exploded view drawing of 7670 Series Wall
and Mobile Aneroid.
Classic Wall and Mobile Aneroid.
1. Remove crystal by pushing down and out at the top. Set crystal
aside.
2. Remove pointer by using the pointer removal tool (T105243B).
Inspect, straighten and aside pointer.
3. Remove the dial by removing the screws with the torque driver
(T112459) and aside.
4. Remove the movement and the mount by unscrewing the
standoffs and removing them from the case.
Reassemble in reverse order
* - See section 8.4 for exploded view drawing of the Classic Wall and
Mobile Aneroid.

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4.2 Calibration of the Wall and Mobile Gauge
1. Attach the pneumatic tubing of test equipment to the gauge.
2. Remove bezel, crystal, pointer and dial.
To set the tension:
3. Tighten all screws.
4. View sector gear and ensure proper position (i.e. right edge of sector gear
should align with mark on base of movement).
5. If sector gear not aligned properly, loosen the capsule nut using a 3/8”
wrench and adjust the sector gear by turning the capsule until sector gear is
in correct position per step 5. Tighten capsule nut.
6. Loosen sector stop lug and pull toward bottom of gauge.
7. Using your left index finger, push the sector gear all the way to the post and
hold that in position.
8. Place tension setting tool (T119628) onto pinion at the 9 o’clock position.
9. Rotate tool clock wise to the 3 o’clock position.
10. Release sector gear and continue rotation to the 6 o’clock position sector
gear should be moving during this step).
11. Bring lug back to correct position and lock into place.
To set the span:
12. Place Test Dial onto gauge. Place pointer onto pinion. Rotate dial until
pointer is at “0” at the bottom of the gauge.
13. Apply 320 mmHg to the Gauge.
14. Release pressure to 300 mmHg to the gauge.
15. If point is less than 300, Place calibration tool (T106845A) into the radius
plate in slot above screw. Pull calibration tool toward bottom of gauge moving
the sector gear upward until pointer reached “300.” Release pressure and
check “0” point.
16. If point is greater than 300, Using the calibration tool (T106845A) positioned
between the sector gear and radius plate on the left of the movement, rotate
the tool clock wise until pointer is at “300” (this brings the radius plate down).
Release pressure and check “0” point.
17. If not at “0” upon release of pressure, rotate test dial until pointer is on the “0”
mark of test dial and re-apply 300 mmHg. Repeat steps 14-17 until span is
set.
18. Check for leak by pinching off the tubing from the test equipment while
pressure is on the gauge. There should be no visible leak.

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Check and finish calibration:
19. Remove the pointer and test dial, replace the gauge’s dial.
20. Place pointer onto pinion and resting in center of oval. Tap pointer with small
hammer slightly to secure.
21. Apply 320 mmHg to the gauge.
22. Release pressure to 300 mmHg and take readings here and at given points
(see section 1.3)
23. If pointer is greater than 300, pull pointer until you feel slight resistance
counter-clock wise, tap pointer with small hammer and recheck. Make sure
pointer returns to the oval each time. Repeat until satisfied.
24. If less than 300, rotate pointer 1 complete revolution clockwise until
resistance is felt. Push pointer a little farther and tap pointer with small
hammer and recheck. Make sure pointer returns to the oval each time.
Repeat until satisfied.
25. Place crystal and bezel back onto gauge and check.
 Please see section 8.8 for a drawing of the Welch Allyn Tycos Movement

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4.3 Testing
1. Hook up the Wall or Mobile Gauge that needs to be tested to the
pneumatic tubing of the test equipment.
2. Apply 320 mmHg to the gauge.
3. Release the pressure to 300 mmHg on the digital pressure meter,
or a calibrated aneroid or mercury gauge. Note: The aneroid or
mercury gauge must be accurate to +/- 3 mmHg at the stated
target pressures using a calibrated digital pressure meter. If using
a calibrated aneroid or mercury column the accuracy must be +/-
6 mmHg.
4. Check reading of the pressure meter or gauge to that of the Wall
or mobile gauge under test. Refer to section 1.3 for specifications.

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Section 5: Economy Aneroid Gauge
5.1 Opening/Removing and Replacing Parts of the
Economy Gauge*
1. Remove the two screws from the back of the case using a Phillips
head screwdriver. Aside the screws and the clip.
2. Remove the Economy cover an d crystal and aside.
3. Remove the pointer using the pointer removal tool (T105243B).
Inspect, straighten and aside the pointer
4. Pry the dial from the case using a small flat head screwdriver.
5. Remove the movement from the case using T108897 and aside.
6. Loosen screw from the case using T105258 and remove the
capsule.
Reassemble In reverse Order
* - See section 8.5 for exploded view drawing for the Economy
Aneroid.