Invacare Pronto M91 User manual

Service Manual
DEALER: Keep this manual. The
procedures in this manual MUST be
performed by a qualified technician.
For more information regarding Invacare
products, parts, and services, please visit
www.invacare.com
Pronto®M91™ and
M94™
with SureStep™

Pronto®M91 and M94™2Part No. 1125038
 WARNING
A QUALIFIED TECHNICIAN MUST PERFORM THE INITIAL SET UP
OF THIS WHEELCHAIR. ALSO, A QUALIFIED TECHNICIAN MUST
PERFORM ALL PROCEDURES IN THE SERVICE MANUAL.
WHEELCHAIR USERS: DO NOT SERVICE OR OPERATE THIS
EQUIPMENT WITHOUT FIRST READING AND UNDERSTANDING
(1) THE OWNER’S OPERATOR AND MAINTENANCE MANUAL
AND (2) THE SEATING SYSTEM’S MANUAL (IF APPLICABLE). IF
YOU ARE UNABLE TO UNDERSTAND THE WARNINGS,
CAUTIONS, AND INSTRUCTIONS, CONTACT INVACARE
TECHNICAL SUPPORT BEFORE ATTEMPTING TO SERVICE OR
OPERATE THIS EQUIPMENT - OTHERWISE INJURY OR DAMAGE
MAY RESULT.
DEALERS AND QUALIFIED TECHNICIANS: DO NOT SERVICE OR
OPERATE THIS EQUIPMENT WITHOUT FIRST READING AND
UNDERSTANDING (1) THE OWNER’S OPERATOR AND
MAINTENANCE MANUAL, (2) THE SERVICE MANUAL (IF
APPLICABLE) AND (3) THE SEATING SYSTEM’S MANUAL (IF
APPLICABLE). IF YOU ARE UNABLE TO UNDERSTAND THE
WARNINGS, CAUTIONS AND INSTRUCTIONS, CONTACT
INVACARE TECHNICAL SUPPORT BEFORE ATTEMPTING TO
SERVICE OR OPERATE THIS EQUIPMENT - OTHERWISE, INJURY
OR DAMAGE MAY RESULT.
IF WHEELCHAIR IS EQUIPPED WITH POWER TILT ONLY OR THE
FORMULA PTO PLUS SEATING SYSTEM, REFER TO POWER TILT
ONLY FOR PRONTO M71 AND M91 OWNER’S MANUAL, PART
NUMBER 1118362 OR TO FORMULA PTO PLUS POWERED
SEATING SERVICE MANUAL, PART NUMBER 1125031 PERFORM
THE FOLLOWING PROCEDURES:
• ADJUSTING SEAT HEIGHT
• ADJUSTING SEAT POSITION
• CHARGING THE BATTERIES
NOTE: Updated versions of this manual are available on www.invacare.com.

TABLE OF CONTENTS
Pronto®M91 and M94™3Part No. 1125038
TABLE OF CONTENTS
SPECIAL NOTES ................................................................................ 7
LABEL LOCATIONS ........................................................................... 9
M91 Standard...............................................................................................................................................9
M91 Heavy Duty.......................................................................................................................................10
M91 with Power Tilt Only .....................................................................................................................11
M91 with Formula™ PTO Plus Seating System ................................................................................12
M94 Standard.............................................................................................................................................13
TYPICAL PRODUCT PARAMETERS .................................................. 14
Pronto M91................................................................................................................................................14
TYPICAL PRODUCT PARAMETERS .................................................. 15
Pronto M91 with Power Tilt Only .......................................................................................................15
TYPICAL PRODUCT PARAMETERS .................................................. 16
Formula PTO Plus ....................................................................................................................................16
TYPICAL PRODUCT PARAMETERS .................................................. 17
Pronto M94................................................................................................................................................17
SECTION 1—GENERAL GUIDELINES ................................................. 18
Repair or Service Information ...............................................................................................................18
Operation Information............................................................................................................................18
Tire Pressure .............................................................................................................................................19
Electrical .....................................................................................................................................................19
Grounding Instructions.......................................................................................................................19
Batteries......................................................................................................................................................19
SECTION 2—EMI INFORMATION ..................................................... 20
SECTION 3—SAFETY INSPECTION/TROUBLESHOOTING .................... 22
Safety Inspection Checklists...................................................................................................................22
Inspect/Adjust .......................................................................................................................................22
Troubleshooting........................................................................................................................................23
Wheels ...................................................................................................................................................23
Troubleshooting - Common .............................................................................................................23
Troubleshooting - Motor/Gearbox/Brake .....................................................................................24
Troubleshooting - Battery .................................................................................................................25
Troubleshooting - Battery Charger.................................................................................................26
Checking Battery Charge Level.............................................................................................................27
Field Load Test..........................................................................................................................................28
Motor Testing.......................................................................................................................................29

TABLE OF CONTENTS
Part No. 1125038 4Pronto®M91 and M94™
TABLE OF CONTENTS
SECTION 4—SEAT ........................................................................... 30
Removing/Installing or Tilting the Seat Assembly .............................................................................30
Removing/Installing the Seat Assembly without Powered Seating Systems ...........................30
Tilting the Seat Assembly - Power Tilt Only Seating System ....................................................31
Tilting the Seat Assembly - Formula PTO Plus Seating System Only ......................................33
Adjusting the Seat Height .......................................................................................................................35
Removing/Installing the Adjustable Height Tubes.............................................................................37
ASBA Seat Service Procedures .............................................................................................................38
Removing/Installing the Seat Pan ......................................................................................................38
Changing the Seat Width/Depth ......................................................................................................39
Replacing the Seat Frame ...................................................................................................................39
Replacing the Seat Positioning Strap................................................................................................40
Removing/Installing the Back Upholstery .......................................................................................40
Removing/Installing/Changing the Back Cane Height ..................................................................40
Adjusting the Back Angle....................................................................................................................43
Van Seat Service Procedures .................................................................................................................45
Adjusting the Back Angle....................................................................................................................45
Adjusting the Seat Position on Van Seat Frame............................................................................45
Adjusting the Van Seat Back Depth.................................................................................................47
Removing/Installing Drive Lockout Switch Mounting Hardware and Cable
(Full Recline Van Seat Only)...................................................................................................................48
SECTION 5—ARMS ......................................................................... 50
Arm Service Procedures for Van Seat.................................................................................................50
Removing/Installing Van Seat Arm ...................................................................................................50
Adjusting Van Seat Arm Width ........................................................................................................50
Adjusting Van Seat Arm Angle..........................................................................................................51
Adjusting Van Seat Arm Height (Adjustable Height Arms Only) .............................................51
Replacing Van Seat Armrest Pad Assembly ...................................................................................52
Arm Service Procedures for ASBA Seat.............................................................................................53
Removing/Installing Flip Back Armrest............................................................................................53
Adjusting the Flip Back Armrest.......................................................................................................54

TABLE OF CONTENTS
Part No. 1125038 5Pronto®M91 and M94™
TABLE OF CONTENTS
SECTION 6—FRONT RIGGINGS ........................................................ 55
Installing/Removing Front Riggings .......................................................................................................55
Installing..................................................................................................................................................55
Removing ...............................................................................................................................................55
Adjusting Footrest Height ......................................................................................................................56
Model PHWH93 ..................................................................................................................................56
Model PH904A and PHAL4A............................................................................................................56
Replacing Heel Loops ..............................................................................................................................57
Raising/Lowering Elevating Front Riggings..........................................................................................57
Adjusting/Replacing Telescoping Front Rigging Supports - Van Style Seats................................58
Adjusting/Replacing Telescoping Front Rigging Supports - ASBA.................................................60
SECTION 7—FOOTBOARD ASSEMBLY .............................................. 61
Removing/Installing the Footboard Assembly....................................................................................61
Removing ...............................................................................................................................................61
Installing..................................................................................................................................................61
Adjusting the Footboard Assembly ......................................................................................................62
Angle .......................................................................................................................................................62
Depth......................................................................................................................................................63
SECTION 8—WHEELS ....................................................................... 64
Replacing the Front/Rear Casters.........................................................................................................64
Adjusting Caster Assembly.....................................................................................................................65
Removing/Installing the Front/Rear Caster Assemblies...................................................................66
Removing ...............................................................................................................................................66
Installing..................................................................................................................................................66
Removing/Installing the Front Headtube Assembly..........................................................................66
Removing/Installing the Drive Wheel ..................................................................................................67
Removing ...............................................................................................................................................67
Installing..................................................................................................................................................67
Removing/Installing the Drive Wheel Hub.........................................................................................68
Removing ...............................................................................................................................................68
Installing..................................................................................................................................................68
Replacing the 2-Piece Wheel Rim and/or the Foam Filled or Pneumatic Tires.........................70

TABLE OF CONTENTS
Part No. 1125038 6Pronto®M91 and M94™
TABLE OF CONTENTS
SECTION 9—SHROUDS/FRAME ........................................................ 71
Removing/Installing the Shrouds ...........................................................................................................71
Removing/Installing the Pivot Tube ......................................................................................................74
Removing/Installing the Walking Beam and/or SureStep Springs ..................................................74
Removing/Installing the Stability Lock Assembly and/or Swing Arm............................................75
Removing ...............................................................................................................................................75
Installing..................................................................................................................................................75
SECTION 10—MOTORS .................................................................... 77
Engaging/Disengaging Motor Release Lever .......................................................................................77
Removing/Installing the Motor ..............................................................................................................78
Inspecting/Replacing Motor Brushes....................................................................................................79
Electro-Mechanical Parking Brake Testing..........................................................................................81
SECTION 11—BATTERIES ................................................................ 82
Installing/Removing the Batteries..........................................................................................................83
Installing Batteries................................................................................................................................83
Removing Batteries..............................................................................................................................86
Connecting/Disconnecting the Battery Wiring Harness.................................................................86
Connecting ............................................................................................................................................87
Disconnecting .......................................................................................................................................87
Replacing the On-Board Battery Charger ..........................................................................................89
SECTION 12—ELECTRONICS ............................................................ 92
Disconnecting/Connecting the Joystick...............................................................................................92
Disconnecting .......................................................................................................................................92
Connecting ............................................................................................................................................92
Repositioning the Joystick.......................................................................................................................93
Adjustable Seat Back Angle (ASBA) Model....................................................................................93
Van Seat Model.....................................................................................................................................94
Replacing the MKIV RII™ 80 AMP Controller..................................................................................95
Replacing the NX-80 or MK5-EX Controller....................................................................................96
SECTION 13—WIRE ROUTING ......................................................... 98
MKIV Wire Routing .................................................................................................................................98
MK5 Wire Routing...................................................................................................................................99
NOTES ......................................................................................... 100
LIMITED WARRANTY ................................................................... 103

SPECIAL NOTES
Part No. 1125038 7Pronto®M91 and M94™
SPECIAL NOTES
WARNING/CAUTION notices as used in this manual apply to hazards or unsafe
practices which could result in personal injury or property damage.
NOTICE
THE INFORMATION CONTAINED IN THIS DOCUMENT IS SUBJECT TO
CHANGE WITHOUT NOTICE.
WHEELCHAIR USER
As a manufacturer of wheelchairs, Invacare endeavors to supply a wide variety of
wheelchairs to meet many needs of the end user. However, final selection of the
type of wheelchair to be used by an individual rests solely with the user and his/her
healthcare professional capable of making such a selection.
WHEELCHAIR TIE-DOWN RESTRAINTS AND SEAT RESTRAINTS
Wheelchair users should NOT be transported in vehicles of any kind while in
wheelchairs. As of this date, the Department of Transportation has not approved
any tie-down systems for transportation of a user while in a wheelchair, in a moving
vehicle of any type.
It is Invacare’s position that users of wheelchairs should be transferred into
appropriate seating in vehicles for transportation and use be made of the restraints
made available by the auto industry. Invacare cannot and does not recommend any
wheelchair transportation systems.
 WARNING
The drive behavior initially experienced by the user may be different from other
chairs previously used. This Power Wheelchair has Invacare’s SureStep technology,
a feature that provides the chair with optimum traction and stability when driving
forward over transitions and thresholds of up to 3-inches. The following warnings
apply specifically to the SureStep Feature.
• Do not use on inclines greater than 9°.
• Do not use on inclines with wet, slippery, icy or oily surfaces. This may include
certain painted or otherwise treated wood surfaces.
• Do not traverse down ramps at high speed. Doing so will reduce traction and
increase stopping distance.
• The end user’s weight can materially affect traction on sloped surfaces. Great
care should be taken when traversing such slopes.
To determine and establish your particular safety limits, practice use of this product
on various sloping surfaces in the presence of a qualified healthcare provider
BEFORE attempting active use of this wheelchair. Other general warnings listed
within this document also apply.

SPECIAL NOTES
Pronto®M91 and M94™8Part No. 1125038
 WARNING
The seat positioning strap is a positioning belt ONLY. It is not designed for use as a
safety device withstanding high stress loads such as auto or aircraft safety belts. If
signs of wear appear, belt MUST be replaced immediately.
Invacare products are specifically designed and manufactured for use in conjunction
with Invacare accessories. Accessories designed by other manufacturers have not
been tested by Invacare and are not recommended for use with Invacare products.
POWERED SEATING SYSTEMS ONLY - This seating system has been custom
designed and will be assembled to the wheelchair base before delivery to the user.
The information contained in this manual is for maintaining and adjusting the seat-
ing system. There are very few adjustments that can safely be made by the user. If
there is a procedure or adjustment that needs to be performed on the seating sys-
tem that is not in this manual, do not perform that procedure. Have the seating
system serviced by a qualified technician.

LABEL LOCATIONS
Part No. 1125038 9Pronto®M91 and M94™
LABEL LOCATIONS
M91 Standard

LABEL LOCATIONS
Pronto®M91 and M94™10 Part No. 1125038
M91 Heavy Duty

LABEL LOCATIONS
Part No. 1125038 11 Pronto®M91 and M94™
M91 with Power Tilt Only

LABEL LOCATIONS
Pronto®M91 and M94™12 Part No. 1125038
M91 with Formula™ PTO Plus Seating System
M91
Standard
Only
M91 Heavy
Duty Only
Rear View of
Actuator

LABEL LOCATIONS
Part No. 1125038 13 Pronto®M91 and M94™
M94 Standard

TYPICAL PRODUCT PARAMETERS
Pronto®M91 and M94™14 Part No. 1125038
TYPICAL PRODUCT PARAMETERS
Pronto M91
NOTE: Based on 18-inch deep Van seat.
*NOTE: Range varies with battery conditions, surface terrain and operator’s weight.
18-INCH
VAN SEAT
20-INCH
VAN SEAT
22-INCH
VAN SEAT
ASBA SEAT
SEAT WIDTH RANGE: 18 inches 20 inches 22 inches 16-24 inches
SEAT DEPTH: 16 -18 inches 18-20 inches 20-22 inches 16-20 inches
BACK HEIGHT W/O HEADREST
SEMI RECLINE: 18 inches 18 inches 18 inches 16-20 inches
BACK ANGLE RANGE
SEMI RECLINE: 35° to 115° 35° to 115° 35° to 115° Standard - 80° to 100°
UPHOLSTERY: Grey Vinyl, Grey Cloth, Tan Vinyl Black Nylon Back
SEAT-TO-FLOOR: 22½ to 23½ inches
(Cushion Not Compressed)
20-22 inches
(To Seat Pan)
OVERALL WIDTH (NO JOYSTICK): 25-7/8 inches
OVERALL HEIGHT: 36-49¼ inches (Semi Recline Back)
39-52¼ inches (Full Recline Back)
OVERALL LENGTH: 39 inches (With Footboard Folded)
40¾ inches (With Footboard Extended)
DRIVE WHEELS/TIRES: 14 x 3-inch (Pneumatic; Flat Free tires ONLY on wheelchairs with
Heavy Duty option)
CASTERS: 6 x 2-inch Front/Rear with Precision Sealed Bearings
FOOTRESTS/LEGRESTS: Flip Up, Depth and Height Adjustable, Footboard,
Swingaway Front Rigging, Elevating Legrest
WEIGHT W/SEATING SYSTEM
AND ACCESSORIES
W/O BATTERIES:
W/BATTERIES:
199 lbs
273 lbs
SHIPPING: 260 lbs (w/o Batteries), 310 lbs (w/Batteries)
ARMRESTS: Adjustable Angle, Depth and Width
BATTERIES: 22NF - Quantity 2
INCLINE CAPABILITY: 9°
PERFORMANCE
SPEED
Standard:
Heavy Duty:
TURNING RADIUS:
*RANGE (VARIABLE)
Standard:
Heavy Duty:
WEIGHT LIMITATION
Standard:
Heavy Duty:
0 to 6.4 mph
0 to 4.25 mph
19½ inches (Front with Footboard); 21½ inches (Rear)
22 miles
12-16 miles
300 lbs
400 lbs

TYPICAL PRODUCT PARAMETERS
Part No. 1125038 15 Pronto®M91 and M94™
TYPICAL PRODUCT PARAMETERS
Pronto M91 with Power Tilt Only
*NOTE: The seat-to-floor heights are based on 18-inch deep seat with 0° (±1°) seat pan angle and
pneumatic tires or flat free inserts. Seat-to-floor height measured from the front edge of seat to floor.
All heights are measured with properly inflated new tires. These heights can vary ±¼-inch due to
tire wear.
 WARNING
If the seating system is mounted onto a power wheelchair that has a weight
limitation greater than that of the seating system, the weight limitation is
maintained at the seating system’s weight limitation. (Example: The M91 Standard
wheelchair has a 300 lb weight limitation, so the seating system still has a weight
limitation of 275 lbs).
SEAT WIDTH RANGE: 16 - 22 inches
SEAT DEPTH RANGE (1-INCH INCREMENTS): 16 - 22 inches
BACK HEIGHT RANGE: 16 - 24 inches
BACK ANGLE RANGE (ASBA): 90° to 120° in 6¼° increments
*SEAT-TO-FLOOR HEIGHT (ADJUSTABLE): 20 - 21 inches ± ½ inch increments
OVERALL WIDTH
WITHOUT JOYSTICK:
WITH JOYSTICK AND TRSS:
26 inches
27 inches
OVERALL HEIGHT: 37 - 45 inches
OVERALL LENGTH WITH FRONT RIGGINGS: 44 inches
TILT RANGE
0° SEAT PAN ANGLE:
5° SEAT PAN ANGLE:
0 - 45°
5 - 50°
TURNING RADIUS WITH FRONT RIGGINGS: 27½ inches
SEAT CUSHION: Cushion (Optional)
WEIGHT OF FORMULA PTO PLUS: 25 lbs
ARMRESTS: Adjustable Angle, Height and Depth
WEIGHT LIMITATION OF M91 WITH FORMULA PTO
PLUS
M91 STANDARD: Up to 250 lbs

TYPICAL PRODUCT PARAMETERS
Pronto®M91 and M94™16 Part No. 1125038
TYPICAL PRODUCT PARAMETERS
Formula PTO Plus
*NOTE: The seat-to-floor heights are based on 18-inch deep seat with 0° (±1°) seat pan angle and
pneumatic tires or flat free inserts. Seat-to-floor height measured from the front edge of seat to floor.
All heights are measured with properly inflated new tires. These heights can vary ±¼-inch due to
tire wear.
 WARNING
If the seating system is mounted onto a power wheelchair that has a weight limita-
tion greater than that of the seating system, the weight limitation is maintained at
the seating system’s weight limitation. (Example: The M91 Standard wheelchair has
a 300 lb weight limitation, so the seating system still has a weight limitation of 275
lbs).
SEAT WIDTH RANGE: 16 - 22 inches
SEAT DEPTH RANGE (1-INCH INCREMENTS): 16 - 22 inches
BACK HEIGHT RANGE: 16 - 24 inches
BACK ANGLE RANGE (ASBA): 80° to 100° in 5° increments
*SEAT-TO-FLOOR HEIGHT (ADJUSTABLE): 18 - 20 inches ± ½ inch increments
OVERALL WIDTH
WITHOUT JOYSTICK:
WITH JOYSTICK AND TRSS:
26 inches
27 inches
OVERALL HEIGHT: 37 - 45 inches
OVERALL LENGTH WITH FRONT RIGGINGS: 44 inches
TILT RANGE
0° SEAT PAN ANGLE:
5° SEAT PAN ANGLE:
0 - 55°
5 - 60°
TURNING RADIUS WITH FRONT RIGGINGS: 27½ inches
SEAT CUSHION: Cushion (Optional)
WEIGHT OF FORMULA PTO PLUS: 25 lbs
ARMRESTS: Adjustable Angle, Height and Depth
WEIGHT LIMITATION OF M91 WITH FORMULA PTO
PLUS
M91 STANDARD:
M91 HEAVY DUTY OPTION:
Up to 275 lbs
Up to 375 lbs

TYPICAL PRODUCT PARAMETERS
Part No. 1125038 17 Pronto®M91 and M94™
TYPICAL PRODUCT PARAMETERS
Pronto M94
NOTE: Based on 24-inch wide Van seat.
*NOTE: Range varies with battery conditions, surface terrain and operator’s weight.
18-INCH
VAN SEAT
20-INCH
VAN SEAT
22-INCH
VAN SEAT
24-INCH
VAN SEAT
ASBA SEAT
SEAT WIDTH RANGE: 18 inches 20 inches 22 inches 24 inches 18-24 inches
SEAT DEPTH: 16 -18 inches 18-20 inches 20-22 inches 20-22 inches 16-22 inches
BACK HEIGHT W/O
HEADREST:
SEMI RECLINE: 18 inches 18 inches 18 inches 18 inches 16-20 inches
BACK ANGLE RANGE:
SEMI RECLINE: 35° to 115° 35° to 115° 35° to 115° 35° to 115°
Standard - 80°
to 100°
UPHOLSTERY:
WITH SEAT PAN: Grey Vinyl
Black Nylon
Back
SEAT-TO-FLOOR: 21-24 inches
(Cushion Not Compressed)
19-22 inches
(To Seat Pan)
OVERALL WIDTH
(NO JOYSTICK): 27-29 inches
OVERALL HEIGHT: 31 inches (Folded)
54 inches (Upright)
OVERALL LENGTH: 35 inches (With Footboard Folded)
43 inches (With Footboard Extended)
DRIVE WHEELS/TIRES: 14 x 3-inch (Flat Free)
CASTER W/PRECISION
SEALED BEARINGS: 6 x 2-inch Front/Rear
FOOTRESTS/
LEGRESTS:
Flip Up, Depth and Height Adjustable, Footboard,
Swingaway Front Rigging, Elevating Legrest
WEIGHT W/ SEATING
SYSTEN AND
ACCESSORIES:
W/O BATTERIES:
W/BATTERIES:
216 lbs
290 lbs
SHIPPING: 260 lbs (w/o Batteries), 310 lbs (w/Batteries)
ARMRESTS: Adjustable Angle, Height and Width, Desk and Full Length
BATTERIES: 22NF - Quantity 2
PERFORMANCE:
SPEED:
TURNING RADIUS:
RANGE (VARIABLE)*:
WEIGHT LIMITATION:
0 to 4.5 MPH
19½ inches
10-15 miles
500 lbs

SECTION 1—GENERAL GUIDELINES
Pronto®M91 and M94™18 Part No. 1125038
SECTION 1—GENERAL GUIDELINES
 WARNING
SECTION 1 - GENERAL GUIDELINES contains important information for the safe
operation and use of this product. DO NOT use this product or any available
optional equipment without first completely reading and understanding these
instructions and any additional instructional material such as Owner’s Manuals,
Service Manuals or Instruction Sheets supplied with this product or optional
equipment. If you are unable to understand the Warnings, Cautions or Instructions,
contact a healthcare professional, dealer or technical personnel before attempting
to use this equipment - otherwise, injury or damage may occur.
Repair or Service Information
Set-up of the Electronic Control Unit is to be performed ONLY by qualified technicians.
The final adjustments of the controller may affect other activities of the wheelchair.
Damage to the equipment could occur under these circumstances. If non-qualified
individuals perform any work on these units, the warranty is void.
Operation Information
Ensure that driving surfaces, ramps, lifts, elevators, ect. are capable of supporting
combined weight of user and wheelchair (for 500lbs user, the combined weight could be
up to 800 lbs).
Performance adjustments should only be made by professionals of the healthcare field or
persons fully conversant with this process and the driver's capabilities. Incorrect settings
could cause injury to the driver, bystanders, damage to the wheelchair and to
surrounding property.
After the wheelchair has been set-up, check to make sure that the wheelchair performs to
the specifications entered during the set-up procedure. If the wheelchair does NOT
perform to specifications, turn the wheelchair OFF immediately and reenter set-up
specifications. Repeat this section until the wheelchair performs to specifications.
DO NOT adjust the rear seat posts higher than the front seat posts.
Avoid storage or use near external flame or combustible product.
The arms on the M94 wheelchair are designed as armrests ONLY. The arms are not
designed to support the full weight of the wheelchair user.

SECTION 1—GENERAL GUIDELINES
Part No. 1125038 19 Pronto®M91 and M94™
Tire Pressure
DO NOT release wheelchair from service unless it has the proper tire pressure (P.S.I.). DO
NOT overinflate the tires. Failure to follow these recommendations may cause the tire to
explode and cause bodily harm. The recommended tire pressure is listed on the side wall
of the tire.
Electrical
Grounding Instructions
DO NOT, under any circumstances, cut or remove the round grounding prong from any
plug used with or for Invacare products. Some devices are equipped with three-prong
(grounding) plugs for protection against possible shock hazards and fire. Where a two-
prong wall receptacle is encountered, it is the personal responsibility and obligation of the
customer to contact a qualified electrician and have the two-prong receptacle replaced
with a properly grounded three-prong wall receptacle in accordance with the National
Electrical Code. If you must use an extension cord, use ONLY a three-wire extension cord
having the same or higher electrical rating as the device being connected. In addition,
Invacare has placed RED/ORANGE WARNING TAGS on some equipment. DO NOT
remove these tags.
Three (3) prong to two (2) prong adapters should not be used. Use of three (3) prong
adapters can result in improper grounding and present a shock hazard to the user.
Batteries
The warranty and performance specifications contained in this manual are based on the
use of deep cycle gel cell batteries. Invacare strongly recommends their use as the power
source for this unit.
Carefully read battery/battery charger information prior to installing, servicing or
operating the wheelchair.

SECTION 2—EMI INFORMATION
Pronto®M91 and M94™20 Part No. 1125038
SECTION 2—EMI INFORMATION
 WARNING
CAUTION: IT IS VERY IMPORTANT THAT YOU READ THIS INFORMATION
REGARDING THE POSSIBLE EFFECTS OF ELECTROMAGNETIC
INTERFERENCE ON YOUR POWERED WHEELCHAIR.
Electromagnetic Interference (EMI) From Radio Wave Sources
Powered wheelchairs and motorized scooters (in this text, both will be referred to
as powered wheelchairs) may be susceptible to electromagnetic interference (EMI),
which is interfering electromagnetic energy (EM) emitted from sources such as
radio stations, TV stations, amateur radio (HAM) transmitters, two way radios, and
cellular phones. The interference (from radio wave sources) can cause the powered
wheelchair to release its brakes, move by itself, or move in unintended directions. It
can also permanently damage the powered wheelchair's control system. The
intensity of the interfering EM energy can be measured in volts per meter (V/m).
Each powered wheelchair can resist EMI up to a certain intensity. This is called its
"immunity level." The higher the immunity level, the greater the protection. At this
time, current technology is capable of achieving at least a 20 V/m immunity level,
which would provide useful protection from the more common sources of radiated
EMI.
There are a number of sources of relatively intense electromagnetic fields in the
everyday environment. Some of these sources are obvious and easy to avoid.
Others are not apparent and exposure is unavoidable. However, we believe that by
following the warnings listed below, your risk to EMI will be minimized.
The sources of radiated EMI can be broadly classified into three types:
1) Handheld Portable transceivers (transmitters receivers with the antenna
mounted directly on the transmitting unit. Examples include: citizens band (CB)
radios, "walkie talkie", security, fire and police transceivers, cellular telephones,
and other personal communication devices).
NOTE: Some cellular telephones and similar devices transmit signals while they are ON,
even when not being used.
2) Medium-range mobile transceivers, such as those used in police cars, fire trucks,
ambulances and taxis. These usually have the antenna mounted on the outside of
the vehicle; and
3) Long-range transmitters and transceivers, such as commercial broadcast
transmitters (radio and TV broadcast antenna towers) and amateur (HAM)
radios.
NOTE: Other types of hand-held devices, such as cordless phones, laptop computers,
AM/FM radios, TV sets, CD players, cassette players, and small appliances, such as elec-
tric shavers and hair dryers, so far as we know, are not likely to cause EMI problems to
your powered wheelchair.