Precor C556 User manual

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C556 Elliptical Fitness Crosstrainer
Warning: This service manual is for use by Precor trained service providers only.
IfyouarenotaPrecorTrainedServicer,youmustnotattempttoserviceanyPrecorProduct;
Call your dealer for service.
This document contains information required to perform the majority of troubleshooting, and
replacement procedures required to repair and maintain this product.
This document contains general product information, software diagnostic procedures (when
available), preventative maintenance procedures, inspection and adjustment procedures,
troubleshooting procedures, replacement procedures and electrical block and wiring diagrams.
To move directly to a procedure, click the appropriate procedure in the bookmark section to the
left of this page. You may “drag” the separator bar between this page and the bookmark section
to change the size of the page being viewed.
© 2003 Precor Incorporated
Unauthorized Reproduction and Distribution Prohibited By Law

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Section One - Things You Should Know
C556 Serial Codes and Manufacturing Dates
The C556 has been manufactured in two versions. The applicable serial codes and
manufacturing dates associated with each version will be detailed below. When servicing a C556
it is critical that you are aware of which version of C556 you are servicing. The differences in the
versions may greatly impact service requirements and procedures. For convenience, the
versions detailed below will be referred to as version 1 or version 2 in the reminder of this service
manual. Any procedures that do not reference a specific version is applicable to all versions of
the C556.
Version 1 was manufactured between May 2000 and July 2001. The serial codes associated
with version 1 are 6Q, 70, 8Y, 8Z, AC, AD, AN and BB.
Version 2 was manufactured between July 2001 and the present. The serial codes associated
with version 2 are DA, DB, EW, HD and HE.
Right, Left, Front, and Back Conventions
In this manual, right, left, front, and back are from the perspective of a user standing on the C556,
facing the display enclosure.
Warning and Caution Statements and General Safety Guidelines
Warning statements indicate a particularly dangerous activity. Warning statements you will find in
this manual include:
• To remove power from the EFX, the power cord must be disconnected from the wall outlet.
Always ensure that the EFX is unplugged from the wall outlet when you inspect or adjust the
EFX, or when you isolate, remove, or replace an EFX component.
• Removing the covers exposes high voltage components and potentially dangerous
machinery. Exercise extreme caution when you perform maintenance procedures with the
hood removed.
• During service operations you will be very close to moving machinery and high voltage
components. When you perform maintenance procedures with the covers removed, remove
jewelry (especially from ears and neck), tie up long hair, remove neck ties, and do not wear
loose clothing.
• Exercise caution when touching any wire or electrical component during EFX operation.
• A pinching hazard exists when the unit is operated by turning the crankarms by hand. It is
possible to seriously pinch a finger between the crankarm and stairarm. The stairarms
should be removed before operating the crankarms by hand.

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Caution statements are intended to prevent damage to the EFX as a result of the current activity.
Caution statements included in this manual are listed below:
• When it is necessary to lift or move the EFX, ensure that the EFX has adequate support and
that you use proper lifting techniques.
Safety guidelines you should know and follow include:
• Read the owner’s manual and follow all operating instructions.
• Operate the EFX on a solid, level surface.

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• Visually check the EFX before beginning service or maintenance operations. If it is not
completely assembled or is damaged in any way, exercise extreme caution while operating
and checking the EFX.
• When operating the EFX, do not wear loose clothing. Do not wear shoes with heels or
leather soles. Check the soles of your shoes and remove any embedded stones. Tie long
hair back.
• Do not rock the unit. Do not stand or climb on the handlebars, display enclosure, or cover.
• Do not set anything on the handlebars, display enclosure, or cover. Never place liquids on
any part of the EFX, while performing service.
• To prevent electrical shock, keep all electrical components, such as the power cord and
circuit breaker away from water and other liquids.
• Do not use accessory attachments that are not recommended by the manufacturer-such
attachments might cause injuries.
General Information
For the latest exploded view, part number and part pricing information, visit the Precor dealer
website at “www.precor.com/Dealer”.
Tools Required
Multimeter Allen wrench set
Anti-static kit Screwdriver set
4” - 6” gear puller 1/2” allen key, socket wrench mounted
“C” clamp or Carpenter’s clamp Precor part number 20030-117 belt gauge
US and metric end wrench set Straight edge
US and metric socket wrench set
Torque wrench, 200 in./lbs.
Torque wrench, 200 ft./lbs

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Section Two - Preventive Maintenance
Preventive maintenance measures are either scheduled or unscheduled. Scheduled preventive
maintenance activities are included here so that you are aware of preventive measures
performed on a regular basis.
Regular Preventive Maintenance (Owner)
Cleanliness of the EFX and its operating environment will keep maintenance problems and
service calls to a minimum. Precor recommends that you perform the following preventive
maintenance schedule.
After Each Use
• Turn off and unplug the EFX.
• Wipe down the covers, handlebars, stairarm wheels and stairarm ramps with a damp cloth.
Daily Maintenance
Clean the EFX’s frame, covers, stairarms, stairarm ramps and stairarm wheels using water or
“Simple Green”. Wipe the surface of the electronic console with a damp sponge or soft cloth. Dry
with a clean towel. “Simple Green” is the only cleaning solution that has been tested and
approved for use on the C556 ramps. Use of any other cleaner, may cause degradation of the
ramp anodizing and void the ramp warranty. The use of an acid (citric) based cleaner will cause
ramp anodizing damage and is not authorized by Precor.
Weekly Maintenance
• Vacuum underneath the EFX, following these steps:
1. Turn off the EFX with the circuit breaker, then unplug it from the wall outlet
2. Place the EFX on its side.
Note:
Place a drop cloth under the EFX to protect the flooring and to ensure that the EFX handrail
is not scratched or damaged.
3. Vacuum the rug or damp mop the floor.
4. Make sure that the floor is dry before returning the EFX to an upright position.

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Quarterly Maintenance
1. Remove the rear covers.
2. Check the step up and input belt alignment and tension as in Procedure 5.3.
3. Replace the rear cover.
On-Site Preventive Maintenance (Service Technician)
When you are called to service a EFX, perform these preventive maintenance activities:
• Perform the software diagnostics. Check LED and keypad function. Record the odometer
reading.
• Check speed sensor function (is the stride rate displayed when the unit is in operation?). If
not, see Procedure 6.3
• Visually inspect the drive belts for cracks, fraying or excessive wear.
• Inspect the power cord. If the power cord is damaged, install a new power cord.
• Visually examine all wires and check connectors and wire connections. Secure connections
and replace wiring as necessary.

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Procedure 3.1 - Software Access Codes
The C556 uses the standard access codes to provide access to the various software features. In
using the standardized access codes the keys are hypothetically numbered left to right with key
#1 on the far left and key #7 on the far right. The standard access codes use all sequential key
presses. The allowable delay between key presses is short. If too much time is taken between
key presses the access procedure will be aborted. If the access is aborted, it will be necessary to
start over from the beginning. See Diagram 3.1. The C556 display does not utilize key positions
#2 and #3, however, they must be counted to correctly locate keys #4 through #6. On the C556
display key #1 is the RESET key and key #4 is the QUICK START key.
Standard Access Codes
Diagnostics Keys RESET,5,1,7,6,5,7,6,1
Odometer Keys RESET,6,5
Club Settings Keys RESET,5,6,5,1,5,6,5
Diagram 3.1 - C556 Display Panel

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Procedure 3.2 - Accessing the Diagnostic Program
The EFX diagnostic software cycles through the following tests:
• Display Test
• Keyboard Test
• Heart Rate Test
• Brake (resistance) Test
Procedure
1. Plug the power cord into the wall outlet, then turn on the EFX with the circuit breaker.
2. Press keys RESET,5,1,7,6,5,7,6,1., sequentially.
3. The message DISPLAY TEST will be displayed followed by every LED on the display being
illuminated. Check each LED segment to ensure that all of the segments are illuminated.
Press the ENTER key to advance to the keyboard test.
4. The message KEYBOARD TEST will be displayed followed by a graphical representation of
each key position on the display housing. As each key on the display is pressed the key
representation is turned “off”, indicating that the key is functioning. Check each key in this
manner, including the numeric keyboard. Press and hold the ENTER key for 2 seconds to
advance to the heart rate test.
5. The message HEART RATE TEST will be displayed followed by the unfiltered (U), filtered
(F) and polar (P) heart rate readings if the heart rate option is installed in the C556 and a
chest strap transmitter or a test transmitter is being used. If the heart rate option is not
installed in the C556, the message NO HEART RATE RECEIVER will be displayed instead
of the heart rate readings. Press the ENTER key to advance to the brake test.
6. The message BRAKE TEST will be displayed followed the resistance level and brake level
readings. This test allows you to test the brake (resistance) at each resistance level. Press
the ENTER key to exit the diagnostics program.

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Procedure 3.3 - Displaying the Odometer
Procedure
1. Plug the power cord into the wall outlet, then turn on the EFX with the circuit breaker.
2. With the PRECOR C556 banner scrolling, press keys RESET,6,5, sequentially. The
message ODOMETER will be displayed followed by the total number of strides
accumulated. The total number of strides can be converted to miles by dividing by 2241 or
to kilometers by dividing by 1392.5. Press the ENTER key to advance to total hours.
3. The message HOURS will be displayed followed by the total number of hours that the C556
has been in use. Press the ENTER key to advance to software version.
4. The message SOFTWARE VERSION will be displayed followed by the software versions of
the upper and lower PCA’s. For example, UPPER 1.01 LOWER 1.01. Press the ENTER key
to advance to error log.
5. The message ERROR LOG will be displayed followed by the error in log position 1. Each
log entry shows the log position, the stride count when the error occurred and the hour
meter when the error occurred. For example; 1 ER21 123456 STR 45678 HRS. The error
log can record up to ten error conditions. The error code in position one will be the most
recent error and the error in position ten will be the oldest error. If more than ten errors have
been logged, only the ten most recent will be displayed. When a new error is logged, each
existing error is pushed down one position and the error in position 10, if any, is lost. Use the
▲ and ▼keys to move through the log. Pressing and holding the QUICK START key for
four seconds will clear the log. Press the ENTER key to exit the odometer program.

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Procedure 3.4 - Club Settings
1. Enter the club settings by pressing keys RESET,5,6,5,1,5,6,5, sequentially.
2. The message SELECT LANGUAGE will be displayed followed by the currently selected
language. Use the ▲ and ▼ keys to select the language preference. Press the ENTER
key to advance to units of measurement.
3. The message SELECT UNITS will be displayed followed by the currently selected unit of
measurement. Use the ▲ and ▼ keys to select either U.S. Standard or METRIC
measurements. Press the ENTER key to advance to maximum workout time.
4. The message SET MAX WORKOUT TIME will be displayed followed by the currently
selected maximum workout time. Use the ▲ and ▼ keys to select the maximum workout
time. The maximum workout time may be set between 1 and 240 minutes or no limit. Press
ENTER to advance to maximum pause time.
5. The message SET MAX PAUSE TIME will be displayed followed by the currently selected
maximum pause time. Use the ▲ and ▼ keys to select the maximum pause time. The
maximum pause time is the that will elapse after the pause key has been pressed until the
unit resets. The maximum pause time may be set between 1 and 120 seconds. Press
ENTER to exit the club settings program.