Precor Bicycle-mounted Child Seat C842 User manual

C842, C842i, C846, C846i Upright and Recumbent Cycle
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C842, C842i, C846, C846i Bicycle
Warning: This service manual is for use by Precor trained service providers only.
If you are not a Precor Trained Servicer, you must not attempt to service any Precor Product;
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.
© 2004 Precor Incorporated
Unauthorized Reproduction and Distribution Prohibited By Law

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Section One - Things You Should Know
Right, Left, Front, and Back Conventions
In this manual, right, left, front, and back are from the perspective of a user sitting on the C842 or
C846, facing the display enclosure.
Identifying C846 Bicycles
Two generations of C842 and C846 bicycles have been manufactured.
The original version was first produce in January 1999. The original upright bicycle was
manufactured under serial codes 6C, 7D, EH and ER. The original recumbent bicycle was
manufactured under serial codes 6B, 7C, DM and EP. This bicycle utilized an alternator and load
resistors to charge the internal battery and provide pedalling resistance.
The second generation C846 bicycle was first produced in February 2003. The C846 upright is
manufactured under serial code NM, the C846 recumbent is manufactured under serial code NN.
This bicycle utilizes a dual microprocessor control system, a touch sensitive keypad, a brushless
generator to charge the internal battery and an eddy current system to provide pedalling
resistance.
All C842 bicycles are second generation bicycles and were first produced on February 2003. The
C842 upright is manufactured under serial code NK, the C842 recumbent is manufactured under
serial code NL.
C846i bicycles were first produced in March 2004. The C846i upright is manufactured under
serial code XE, the C846i recumbent is manufactured under serial code XX.
The C842i upright is manufactured under serial code AA28, the C842i recumbent is
manufactured under serial code A993.
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 C842, C842i, C846 or C846i, the optional power adapter must be
disconnected from the cycle. Always ensure that the optional power adapter is disconnected
from the cycle when you inspect or adjust the C842, C842i, C846 or C846i, or when you
isolate, remove, or replace a component.
• When serial code 6B, 6C, 7C, 7D, DM, DQ, EP or ER cycles are operated the load resistor
will become very hot. During any service procedure, avoid contact with the load resistor or be
sure that the load resistor has cooled sufficiently to be safely handled.

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• Removing the covers exposes high voltage components and potentially dangerous moving
parts. 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 operation.
• Caution statements are intended to prevent damage to the bicycle as a result of the current
activity. Caution statements included in this manual are listed below:
Safety guidelines you should know and follow include:
• Read the owner’s manual and follow all operating instructions.
• Visually check the bicycle 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 bicycle.
• When operating the bicycle, 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. While servicing, never
place liquids on any part of the bicycle The water bottle holder must be empty.
• To prevent electrical shock, keep all electrical components, such as the power cord and
power adapters away from water and other liquids.
• Do not use accessory attachments that are not recommended by the manufacturer, such
attachments might cause injuries or damage to the unit.
General Information
For the latest exploded view diagram, part number and part pricing information, visit the Precor
dealer website at “www.precor.com/connection”.

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Required Tools and Equipment
The following is a summary of the tools and equipment that may be required when you service a
Precor C842, C842i, C846 or C846i Upright or Recumbent Cycle.
Tools
Phillip and flat-head screwdrivers
Standard and metric allen wrench set
Open-end wrench set
Socket wrench set
Chip puller
Rubber mallet
Snap ring pliers
Torque wrench
Pry bar
20030-119 secondary sheave tool
32 mm deep well socket
Equipment
Anti-static kit
Digital multimeter
Supplies
Cable ties

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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 cycle 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 power adapter (if equipped) from the bicycle.
• Wipe down the covers, handlebars, seat and pedals with a damp cloth.
Daily Maintenance
Clean the bicycle’s frame, covers, seat and pedals using a water damped cloth. Wipe the surface
of the electronic console with a damp sponge or soft cloth. Dry with a clean towel.
Weekly Maintenance
• Clean underneath the bicycle, following these steps:
1. Turn off the bicycle with the on/off switch, then unplug it from the power adapter (if
equipped).
2. Place the bicycle on its side.
Note:
Place a drop cloth under the bicycle to protect the flooring and to ensure that the cycle 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 bicycle to an upright position.

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Quarterly Maintenance
1. Remove the cover.
2. Thoroughly clean inside the bicycle. Use a vacuum cleaner and damp rag all dust belt
particles, etc.
3. Check the belt tension of both belts per Procedures 5.1 and 5.2.
4. Replace both covers.
On-Site Preventive Maintenance (Service Technician)
When you are called to service a C842, C842i, C846 or C846i, perform these preventive
maintenance activities:
• Perform the software diagnostics. Check LED and keypad function. Record the odometer
reading. See Procedure 3.1.
• Check speed sensor function (is RPM or speed displayed when the unit is in operation?). If
not, see Procedure 6.4
• If the unit is operated at resistance level 1, does it turn freely and smoothly? If not, see
Procedure 6.6.
• Visually inspect the drive belts for cracks, fraying or excessive wear.
• 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 C842 C846 and C846i use 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. On the version 1 display, key #6
is a hidden key on the display panel and is functional. When it is necessary to use key #6, press
midway between the CHANGE key (key #5) and the QUICK START key (key #7). 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 for C846
version 1 displays and Diagram 3.2 for C846 i and C846 version 2 displays. The C842 display is
not illustrated. The same access code procedures are used on the C842 as on the C846 version
2.
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 - C846 Display (version 1)
Key #1
RESET
Ke
y
#5
Key #6 Key #7

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Diagram 3.2 - C846i and C846 (version 2) Display
Key #7
Key #6Key #5
Reset
& Key #1

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Procedure 3.2 - Accessing the Diagnostic Program
The C846 diagnostic software cycles through the following tests:
C846 version 1 C846 i & C846 version 2 C842 & C842i
• LED Diagnostics LED Diagnostics Display Test
• Keypad Test Keypad Test Keyboard Test
• Power Bits/Speed Heart Rate Heart Rate Test
• Heart Rate Battery Voltage Display Battery Test
• Battery Voltage Display RPM Test RPM Test
• Brake Test Brake Test
Procedure
1. On C846 version 1 units, set the on/off switch in the “on” position. It will be necessary to
start pedaling for the bicycle to “power up”. You must continue pedaling while performing
this procedure.
2. With the start up banner displayed press keys RESET,5,1,7,6,5,7,6,1, sequentially.
3. For C842 and C842i units, skip to step 24. For C846i and C846 version 2 units, skip to step
11. For C846 version 1 units, continue with step 4.
4. Watch the upper display, all LED’s in the main window and the eight LED’s below the main
window should be lit.
5. Press any key to continue with the key pad test.
6. The display will show seven vertical rows of two dots each. Each row corresponds to a key
on the display. Press each of the seven keys, including the hidden key between the
CHANGE and QUICK START key, the corresponding row will expand to six dots. Press and
hold the RESET key to continue.
7. Power bits indicates the amount of power required to pedal the bike. The power bits are
adjustable between 0 and 255 by using the  or  keys. The greater the power bits
number the greater the pedaling resistance. Press ENTER to toggle the display between
power bits and speed. Press the RESET key to continue to the heart rate test.
8. The left side of the window displays a “U F P”. the right side displays the heart rate, when a
signal is received from a chest strap or test transmitter. The U indicates unfiltered, the F
indicates filtered and P indicates Polar. The ENTER toggles through the three choices.
When unfiltered is selected the heart rate display will show heart rate as received from the
transmitter. When filtered is selected the heart rate signal will be averaged and displayed.
When Polar is selected, the Polar method of filtering will be used and the results displayed.
The Polar method of filtering is used during normal operation. Press and hold the RESET
key to display the battery voltage level display

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9. The battery voltage level will be displayed. Typically, the battery voltage level will be
between 6.0 Vdc and 6.2 Vdc. A battery charger in the bike charges the battery as the bike
is pedaled. If the battery voltage will not come up to 6.0 Vdc when the bike has been
pedaled for several minutes or decreases very rapidly when then bike is not being pedaled,
the battery should be replaced. Press the RESET key to exit the diagnostics routine.
10. The display will momentarily read HARDWARE VALIDATION.
11. Watch the upper display, all LED’s on the display should be lit.
12. Press the ENTER to continue to the key pad test.
13. The display will momentarily read KEYBOARD TEST.
14. The display will show a vertical rows of two dots each to represent each key on the keypad.
Press each of the keys, upper dot in each key representation will go out when the key is
pressed. Press and hold the ENTER key to continue.
15. The display will momentarily read HEART RATE TEST.
16. “U F P”. will be displayed. Grasp the hand held heart rate grips on the seat handlebars. The
U indicates unfiltered, the F indicates filtered and P indicates Polar. Release the hand held
heart rate grips and repeat the test using a chest strap transmitter or heart rate test
transmitter. Verify that both the hand held and wireless (chest strap) readings are correct. A
Polar watch is a good means of verifying the accuracy of the heart rate readings. Press the
ENTER key to continue.
17. The display will momentarily read BATTERY TEST.
18. The current battery voltage will be displayed as XX.X VOLTS. Press the ENTER key to
continue.
19. The display will momentarily read RPM TEST.
20. The display will show the pulse count from the display and the bike’s sped in RPM.
21. The display will momentarily read BRAKE TEST.
22. The display will show the current resistance level setting and the eddy current power bits
reading (BRAKE). Using the resistance  or  keys, change the resistance level. The
power bits reading should increase or decrease proportionally to the resistance level setting
and the pedalling resistance should also increase or decrease proportionally to the
resistance level setting
23. Press the ENTER or RESET key to exit the diagnostics program.
24. The message DISPLAY TEST will be momentarily displayed. All of the LED’s on the display
will then be illuminated.
25. Press the SELECT key to continue to the keyboard test.

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26. The message KEYBOARD TEST will be momentarily displayed. A representation of each
key on the keyboard will be displayed. Pressing a key will cause the representation to
change, indicating that the key is functioning normally. Test all of the keyboard keys in this
manner.
27. Press the SELECT key to continue to the heart rate test.
28. The Polar filtered heart rate will be displayed as P XX. Pressing the SELECT key will
toggle the display to the filtered heart rate, displayed as F XX. Pressing the SELECT key
again will toggle the display the unfiltered heart rate, displayed as U XX.
29. Press the RESET key to continue to the battery test.
30. The message BATTERY TEST will be momentarily displayed.
31. A message will scroll indicating that the optional external is or is not connected. Pressing the
SELECT key will cause a message to be displayed indicating the battery condition. Pressing
the SELECT key again will display the actual battery voltage as BATTERY XX.X.
32. Press the RESET key to continue to the RPM test.
33. The message RPM TEST will be momentarily displayed.
34. The message RPM PULSE will be momentarily displayed, followed by the actual RPM
reading.
35. Press the SELECT key to continue to the brake test.
36. The message BRAKE TEST will be momentarily displayed.
37. The message POWER BITS will be momentarily displayed, followed by the power bit
reading. The power bit reading will change in correspondence with any change in the
resistance level. Pressing the SELECT key will toggle the display to the resistance level.
38. The message RESISTANCE LEVEL will be momentarily displayed, followed by the current
resistance level setting.
39. Press the RESET key to exit the program.

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Procedure 3.3 - Displaying the Odometer
Procedure
1. For C846 version 1 units, set the on/off switch in the “on” position. You must continue
pedaling while performing this procedure.
2. With the banner scrolling, press keys RESET,6,5, sequentially until the message. The total
revolutions will be displayed.
3. For C842 and C842i units, skip to step 19. For C846i and C846 version 2 units, skip to step
8. For C846 version 1 units, continue with step 4.
4. Press the ENTER key and the total hours of usage will be displayed.
5. Press the ENTER key and the software version will be displayed.
6. Press the ENTER key and the first entry of error code log will be displayed. Use the  and
 keys to view all of the error code log entries.
7. Press and hold the RESET key to exit the ODOMETER program.
8. The display will momentarily read INFORMATION DISPLAY.
9. The display will momentarily read ODOMETER.
10. The odometer will be displayed as XXXXX REVOLUTIONS. Press the ENTER key to
continue to the hour meter display.
11. The display will momentarily read HOUR METER.
12. The hour meter will be displayed as XXX HOURS. Press the ENTER key to continue to the
software version display.
13. The display will momentarily read SOFTWARE VERSION.
14. The software versions will be displayed as UPPER X.XX LOWER X.XX. Press the ENTER
key to continue to the error log display.
15. The first (most recent) error will be displayed or the message NO ERRORS will be displayed
if the log is empty. The  and  keys will move you through the log. Pressing and holding
the QUICK START will allow you to clear the error log. Press the ENTER key to continue to
the serial number display
16. The display will momentarily read SERIAL NUMBER.

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17. The serial number of the unit will be displayed or NO SERIAL NUMBER. If a serial number
has not been entered into memory. The serial number is in the upper PCA memory,
therefore if the upper PCA is replaced or installed on a different C846 the serial number will
be lost or incorrect.
18. Press the ENTER or RESET key to exit the program.
19. The odometer will be displayed, in total revolutions, as REVOLUTIONS XXXXXX.
20. Press the SELECT key to continue to the total hours display.
21. The total hours the bike has been used will be displayed as HOURS XXXX.
22. Press the SELECT key to continue to the software display.
23. The upper and lower software versions will be displayed as UPPER SW: VER XX.X
LOWER SW: VER XX.X.
24. Press the SELECT key to continue to the error log.
25. The first (most recent) error will be displayed or the message NO ERRORS will be displayed
if the log is empty. The  and  keys will move you through the log. Pressing and holding
the QUICK START will allow you to clear the error log.
26. Press the RESET key to exit the program.

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Procedure 3.4 - Club Settings
1. For C846 version 1 units, set the on/off switch in the “on” position.
2. On all versions, you must continue pedaling while performing this procedure.
3. For C842 and C842i units, skip to step 23. For C846i and C846 version 2 units, skip to step
11. For C846 version 1 units, continue with step 3.
4. Enter the club settings by pressing keys RESET,5,6,5,1,5,6,5, sequentially.
5. Either U.S. STANDARD or METRIC will be displayed. Use either of the  or  keys to
select the desired setting.
6. Press the ENTER key to continue.
7. The maximum workout time will be displayed. The maximum workout may be selected with
either of the  or  keys. Press ENTER to continue.
8. The maximum workout time is displayed on the display window. The maximum workout time
is the maximum time a user is allowed to use the unit.
9. The maximum workout time is adjustable between 10 and 240 minutes. If you wish to
change the maximum workout time...
THEN... OTHERWISE...
Use the  or  keys to select Continue with the next step.
the new maximum workout time;
then continue with the next step.
10. Press and hold the RESET key to exit the program.
11. Enter the club settings by pressing keys RESET,5,6,5,1,5,6,5, sequentially.
12. The display will momentarily read SET CLUB PARAMETERS.
13. The display will momentarily read SELECT UNITS.
14. Either U.S. STANDARD or METRIC will be displayed. Use the either of the  or  keys
to select the desired setting.
15. The display will momentarily read SET MAX WORKOUT TIME.
16. The current maximum workout time will be displayed. Use either of the  or  keys to
select the desired setting. The maximum workout time may be set between 1 and 240
minutes or no limit.

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17. The display will momentarily read SET MAX PAUSE TIME.
18. The current maximum pause time will be displayed. Use either of the  or  keys to
select the desired setting. The maximum pause time may be set between 1 and 120
seconds.
19. The display will momentarily read SET RESISTANCE RANGE.
20. The current resistance rang setting will be displayed. Use either of the  or  keys to
change the resistance range setting.
21. The change custom program section of the program will be available. follow the screen
prompts to change the custom course if desired, otherwise continue with step 18.
22. Press the ENTER or RESET key to exit the program.
23. Enter the club settings by pressing keys RESET,5,6,5,1,5,6,5, sequentially.
24. The display will momentary read SELECT UNITS, followed by either U.S. STANDARD or
METRIC. The  or  keys will toggle between the two measurement standards. When
the desired unit of measure is selected, press the SELECT key to continue to maximum
workout time.
25. The display will momentarily read SET MAX WORKOUT TIME, followed by the current
maximum workout time setting. The  or  keys will allow you to set the maximum
workout time between 1 and 99 minutes or no limit. Press the SELECT key to continue to
maximum pause time.
26. The display will momentarily read SET MAX PAUSE TIME, followed by the current
maximum workout time setting. The  or  keys will allow you to set the maximum
workout time between 1 and 120 seconds.
27. Press the ENTER or RESET key to exit the program.

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Procedure 3.5 - Documenting Software Problems
When a problem is found with either the software or upper or lower PCA’s, record the information
listed below. If you isolated the problem to either the PROM, upper PCA, or lower PCA, include
the information you recorded with the malfunctioning PROM or PCA when you ship it to Precor.
When a problem occurs, record the following information:
• Model and serial number
• Software version number
Note:
Look at the PROM mounted on the upper PCA. A label on the PROM indicates the software
version number.
• User and program number running when the problem occurred
• A description of:
a What happened or failed to happen.
b The action taken by the user just before the problem occurred.
c Problem-related information (such as how far into the program the problem occurred,
the work level being used when the problem occurred, etc.).
d The frequency of occurrence.

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Section Four - Checking C842, C842i, C846 or C846i
Operation
This section provides you with a quick method of checking operation.
Procedure
1. On C846 version 1 units, set the on/off switch in the “on” position.
2. Start pedaling.
3. With the banner displayed, press QUICK START.
4. Select Resistance Level 1 and press ENTER.
5. Operate the C842, C846 or C846i for 4–5 minutes. As you operate the bike, concentrate on
the operating sounds made by the unit. Be on the alert for unusual rubbing, hitting, grinding,
or squeaking noises.
6. If the bike makes unusual noises or the electronic display does not change appropriately,
troubleshoot per Section 6.
7. Press the RESISTANCE ▲ key until you reach Resistance Level 10. Operate the C846 for
another 2–3 minutes.
8. If the resistance does not change or the operation of the bike feels inconsistent compared
with Resistance Level 1, troubleshoot per section 6.
9. Press the RESISTANCE ▲ key until you reach Resistance Level 20. Operate the bike for
another 2–3 minutes.
10. If the resistance of the bike does not change or operation feels inconsistent with Resistance
Levels 1 and 10, troubleshoot per Procedure 6.5.
11. Check the LED’s mounted on the upper PCA and the function keys displayed on the
electronic console by performing Procedure 3.2.

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Procedure 5.1 - Primary Drive Belt Adjustment
1. For C842, C842i, C846i or C846 version 2 units, skip to step 8. For C846 version 1 units,
continue with step 2.
2. Set the on/off switch in the “off” position.
3. Remove the right hand cover per Procedure 7.1.
4. Attach a drive belt tension gauge (Precor part # 20030-108 or equivalent) to the upper span
of the primary drive belt. The gauge should read approximately 60 pounds. If the reading is
incorrect, continue with step 4.
Diagram 5.1 - Primary Belt Tensioning (C846 version 1)
5. Loosen the adjustment bolt only enough to allow the adjustment bracket to pivot. The
square hole in the adjustment bracket is made to fit a 1/2” drive socket wrench.
6. Insert a 1/2” drive socket wrench into the square hole and loosen or tighten the adjustment
bracket as require until the drive belt gauge reads 90 pounds. Maintain the belt tension and
tighten the adjustment bolt.
Primary
Drive Belt
Square
Hole
Adjustment
Bolt

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7. Replace the right hand cover per procedure 7.1.
8. Remove the left, right and top covers. Place the belt tension gauge, as shown in Diagram
5.2, on the primary belt.
Diagram 5.2 - Primary Belt Tensioning (C842, C842i, C846i and C846 version 2)
9. The belt gauge should read 95 pounds plus or minus 5 pounds. If the belt tension is
incorrect, loosen but do remove the idler pulley locknut. Insert a pry bar between the bottom
side of the idler pulley and the frame tab directly below the idler pulley. Carefully, pry the
idler pulley upward until the belt gauge reads 95 pounds. While maintaining the belt gauge
reading at 95 pounds, torque the idler pulley locknut to 120 inch pounds.
10. Check the secondary belt tension per procedure 5.2.
11. Replace the top and both side covers.
Belt
Gauge
Primary
Belt
Idler
Pulley
Idler Pulley Locknut

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Procedure 5.2 - Secondary Drive Belt Adjustment
1. For C842, C842i, C846i and C846 version 2 units, skip to step 8. For C846 version 1 units,
continue with step 2.
2. Set the on/off switch in the “off” position.
3. Remove the left side cover per Procedure 7.1.
4. Attach a drive belt gauge (Precor part # 20030-108 or equivalent) to the upper span of the
secondary drive belt. The gauge should read approximately 60 pounds. If the drive belt
gauge reading is incorrect, continue with step 4.
Diagram 5.3 - Secondary Belt Tensioning (C846 version 1)
5. Loosen the upper alternator adjustment nut only enough to allow the alternator will pivot.
Rotate the alternator to loosen or tighten the secondary drive belt as required.
6. Rotate the alternator until the drive belt gauge reads 60 pounds. Maintain the tension on the
secondary drive belt and tighten the adjustment bolt.
Secondary Drive Belt Upper Alternator
Adjustment Bolt