Frymaster Sin Bad Service Manual
SERVICE MANUAL
McDonald’s
SinBaD
Series
SINGLE BASKET DISPENSER
This document is to be inserted
into the Non-Fryer Section of
the Equipment Manual.
MANUFACTURED FOR
McDONALD’S®
BY FRYMASTER, L.L.C.
P.O. BOX 51000
SHREVEPORT, LOUISIANA 71135-1000
PHONE 1 (318) 865-1711
1 (800) 24 FRYER
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable liquids and vapors in the
vicinity of this or any other appliance.
TABLE OF CONTENTS
WARRANTY STATEMENT .................................................................................................................... Page i
TROUBLESHOOTING.............................................................................................................................Page 1-1
COMPONENT REPLACEMENT .............................................................................................................Page 2-1
PARTS LIST ............................................................................................................................................Page 3-1
APPENDIX A .......................................................................................................................................... Page A-1
Frymaster L.L.C., 8700 Line Avenue 71106, 5489 Campus Drive 71129
TEL 318-865-1711 FAX (Parts) 318-219-7140 (Tech Support) 318-219-7135
Printed in the United States
P.O. Box 51000, Shreveport, Louisiana 71135-1000
Service Hotline
1-800-24-FRYER
AUGUST 2004
U.S. $7.00
8195862
xx
DANGER
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE CAN CAUSE PROPERTY
DAMAGE, INJURY, OR DEATH. READ THE INSTALLATION, OPERATING, AND MAINTENANCE INSTRUCTIONS
THOROUGHLY BEFORE INSTALLING, OPERATING, OR SERVICING THIS EQUIPMENT.
DANGER
DO NOT ATTEMPT TO REPAIR OR REPLACE ANY COMPONENT OF THIS EQUIPMENT UNLESS ALL POWER TO THE
EQUIPMENT HAS BEEN DISCONNECTED.
DANGER
FOR YOUR SAFETY, DO NOT STORE OR USE GASOLINE OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE.
DANGER
FRYMASTER EQUIPMENT IS MANUFACTURED FOR USE WITH THE TYPE VOLTAGE SPECIFIED ON THE EQUIPMENT
RATING PLATE. FOR PROPER ELECTRICAL INSTALLATION PROCEDURES IN THE UNITED STATES, REFER TO THE
LATEST EDITION OF THE NATIONAL ELECTRIC CODE (ANSI/N.F.P.A. NO 70). IN CANADA, REFER TO THE CANADIAN
ELECTRICAL CODE PART 1 (CSA-22.1.) FOR INSTALLATION IN COUNTRIES OTHER THAN THE UNITED STATES AND
CANADA, REFER TO THE NATIONAL CODE APPROPRIATE FOR THE COUNTRY IN WHICH THE EQUIPMENT IS BEING
INSTALLED.
WARNING
DO NOT OPERATE THIS EQUIPMENT UNLESS ALL SERVICE AND ACCESS PANELS ARE IN PLACE AND PROPERLY
SECURED.
WARNING
COMPUTERS
FCC
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: 1) This device may
not cause harmful interference, and 2) This device must accept any interference received, including interference that may
cause undesired operation. While this device is a verified Class A device, it has been shown to meet the Class B limits.
CANADA
This digital apparatus does not exceed the Class A or B limits for radio noise emissions as set out by the
ICES-003 standard of the Canadian Department of Communications.
Cet appareil numerique n’emet pas de bruits radioelectriques depassany les limites de classe a et b prescrites
dans la norme NMB-003 edictee par le ministre des communications du Canada.
HAZARD COMMUNICATION STANDARD (HCS) – WHEN THE PROCEDURES IN THIS MANUAL INCLUDE
THE USE OF CHEMICAL PRODUCTS, THE PRODUCTS WILL BE PRINTED IN BOLD FACE, FOLLOWED BY
THE ABBREVIATION HCS IN THE TEXT PORTION OF THE PROCEDURE. SEE THE HAZARD
COMMUNICATION STANDARD (HCS) MANUAL FOR THE APPROPRIATE MATERIAL SAFETY DATA SHEET
(MSDS).
xx
McDonald’s SinBaD
SINGLE BASKET DISPENSER
WARRANTY STATEMENT
Frymaster L.L.C. makes the following limited warranties to the original purchaser only for this equipment and
replacement parts:
Warranty Provisions
Frymaster L.L.C. warrants all components against defects in material and workmanship for a period
of one year.
All parts, with the exception of fuses, are warranted for one year after installation date of cabinet.
If any parts, except fuses, become defective during the first year after installation date, Frymaster will
also pay straight-time labor costs to replace the part, plus up to 100 miles/160 km of travel (50
miles/80 km each way).
Parts Return
All defective in-warranty parts must be returned to a Frymaster Factory Authorized Service Center
within 60 days for credit. After 60 days, no credit will be allowed.
Warranty Exclusions
This warranty does not cover equipment that has been damaged due to misuse, abuse, alteration, or
accident such as:
• Improper or unauthorized repair;
• Failure to follow proper installation instructions and/or scheduled maintenance procedures as pre-
• Improper maintenance;
• Damage in shipment;
• Abnormal use;
• Removal, alteration, or obliteration of the rating plate.
This warranty also does not cover:
• Transportation or travel over 100 miles/160 km (50 miles/80 km each way), or travel time over
• Overtime or holiday charges;
• Consequential damages (the cost of repairing or replacing other property that is damaged), loss of
There are no implied warranties of merchantability or fitness for any particular use or purpose. For
international warranty, the above paragraphs apply, except that the customer is responsible for freight and
duty charges.
scribed in the manual shipped with the unit;
two-hours;
time, profits, use or any other incidental damages of any kind.
i
xx
SinBaD
SinBaD
McDonald’s
SinBaDSinBaD
SINGLE BASKET DISPENSER
CHAPTER 1: TROUBLESHOOTING
1.1 Functional Description
When the unit is plugged into an electrical outlet, line voltage is supplied to the transformer. Placing the
ON/OFF switch in the ON position supplies 24VAC to the motor interface board. The motor interface board
supplies 12VDC to the controller and 24VDC to the dispense motor and drum motor. The drum motor will
activate briefly as the computer in the controller “wakes up,” then motor logic circuits in the controller will
turn it back off. If closed, the dispensing chute door will open and remain open.
When the ON/OFF switch is placed in the ON position, the controller automatically enters the STANDBY
mode. When in the STANDBY mode, the batch weight selector switch circuits are disabled and the CLEAN
and PROGRAM circuits are enabled. No indicator LEDs are illuminated when the unit is in the STANDBY
mode.
Pressing the RUN switch places the controller in the RUN mode and causes the RUN mode indicator above
the switch to illuminate. Every time the unit is placed in the RUN mode, the controller will perform an
initialization process to “zero” the load cell. The dispensing chute door will open and remain open
throughout the process to ensure accuracy. When in the RUN mode, the batch weight selector switch circuits
are enabled and the CLEAN and PROGRAM circuits are disabled.
The load cell is an aluminum bar that acts as a bridge resistor. One end of the load cell is fixed. The load cell
arms, dispensing chute, and dispense motor are attached to the opposite end. Their weight causes a slight
distortion of the bar, which changes the bar’s resistance.
During the zeroing process, circuitry in the controller measures the resistance associated with the weight of
the empty dispensing chute, the dispense motor, and the load cell arms. It compares this to a factoryprogrammed resistance range and, if within the range, records this as the “zero” value. If the resistance is
outside of tolerance, the unit goes into a zero failure mode, signified by blinking of the RUN mode indicator
and the PROGRAM mode indicator.
During programming of the batch selector switches, the controller measures the difference between the
previously determined “zero” resistance and the resistance associated with the new weight. It records the
differential so that a batch weight always corresponds to the “zero” resistance plus the differential resistance,
not a specific resistance value. This avoids erratic batches caused by fluctuations in the “zero” weight.
When a batch weight selector is pressed, the controller activates the drum motor to transfer fries to the
dispensing chute. When the fries enter the chute, their weight further distorts the load cell, causing a change
in resistance. When the resistance is equal to the “zero” resistance plus the resistance differential associated
with the batch weight selector pressed, the controller signals the drum motor to stop.
A proximity sensor at the rear of the dispensing well senses when a basket has been inserted into the well. It
signals the controller, which in turn activates the dispense motor to dump the fries. When the door reaches
the full open position, a flag on the dispense motor shaft is detected by a Hall effect sensor that signals the
controller. The controller in turn reverses the current to the motor, closing the door. When the door reaches
the closed position, another Hall effect sensor detects the flag on the motor shaft and signals the controller.
The controller reduces power to the dispense motor to approximately 1VDC, causing the motor to hold the
door closed. A built-in 1½-second delay allows the load cell to stabilize before the controller reactivates the
1-1
drum motor to reload the dispensing chute. If a basket has been pre-positioned beneath the dispensing chute,
the unit will dispense the batch as soon as the load cell is satisfied and begin loading another batch. The
second batch will be held until the first batch is removed and a new basket is inserted. The process continues
until the unit is placed in the STANDBY mode or the ON/OFF switch is placed in the OFF position.
1.2 Troubleshooting and Problem Isolation
This section is intended to provide technicians with a general knowledge of the broad problem categories
associated with this equipment, and the probable causes of each.
Problems you are likely to encounter can be grouped into three categories:
a. Failures to “zero”
b. Erratic or inaccurate batch weights
c. Failures to function correctly
A series of troubleshooting guides is also included at the end of the chapter to assist in identifying some of
the more common problems.
1.2.1 Failures to “Zero”
As discussed in Section 1.1, the unit determines batch weights by comparing the load cell resistance to a prerecorded resistance value equal to the empty or “zero” resistance value plus a resistance differential value
corresponding to a particular batch weight. When the load cell resistance is equal to the “zero” resistance
plus the resistance differential, the load cell is “satisfied” and the drum motor is stopped. Although each load
cell is theoretically identical, in actuality any given cell may have a slightly different resistance from any
other cell. Consequently, the cell must be “zeroed” to determine and record its actual resistance in order to
ensure accurate batch weights. The unit must be “zeroed” with the dispense chute in place, and no part of the
dispense chute may be in contact with the cabinet.
The load cell itself is basically an aluminum bar. When
not under stress, it has a particular resistance. When the
bar is vertically distorted by applying weight to one end,
The Load Cell Assembly
Load Cell
the resistance changes. Also, if the bar contacts any
other component, such as the end of the dispense motor
shaft, its resistance will be changed, forcing it outside
the acceptable range. Circuitry within the controller
measures the load cell resistance and compares this to a
factory-programmed (and very narrow) range. As long
as the load cell resistance falls within this range, the unit
Load Cell Brace
will “zero.”
Other than the load cell or an associated component being in contact with something it shouldn’t, there are
only three probable causes for failing to “zero.” The first is a malfunctioning controller. If the controller
cannot measure load cell resistance or loses the programmed resistance range, it cannot “zero.” The
recommended method of checking the controller is to use a load cell simulator (P/N 826-5658). If the unit
fails to zero with the simulator substituted for the load cell, the controller has probably failed. An alternate
method is to substitute a controller known to be good for the suspect controller. It is not necessary to install a
controller to test it. Simply plug the cabling into the new controller. If the unit “zeroes,” the controller in the
unit has failed and should be replaced with the new one. The next probable cause is a failed load cell.
Failure may be caused by bending of the cell or by damage to the cabling. Because the resistance range is
narrow, it is usually impossible to see the damage, so the appearance of the load cell is not a good indicator
1-2
of load cell failure, although an obviously damaged cell is immediately suspect. The recommended method
for diagnosing a failed load cell is to use the simulator mentioned earlier. If the unit zeroes with a simulator
substituted for the load cell, the load cell has probably failed. If the controller and load cell test OK, the third
(and least likely) probable cause is a failure of the cable between the load cell and the computer. NOTE: If
the unit “zeroes” sometimes but fails at others, check for a loose connection at the controller.
In any of the situations, the only solution is to replace the failed component, but before doing that verify that
a. The load cell brace is not touching the end of the dispense motor shaft. (Do this by trying to insert a
piece of paper between the two. If it can be inserted without drag, it’s okay.)
b. No part of the dispense chute is touching the cabinet.
1.2.2 Erratic or Inaccurate Batch Weights
The probable cause of erratic or inaccurate batch weights is bumping or jarring of the unit while the drum
motor is running.
The unit should be positioned in an area where it is not likely to be bumped or jarred during operation. If
erratic or inaccurate batch weights occur at random intervals, it is likely that the unit is being bumped or
jarred by workers. The only solutions in this case are to move the unit or better educate employees about the
effects of bumping the unit during operation.
If the erratic or inaccurate batch weights occur at specific times, or if the problem comes and goes, there may
be a source of unusual vibration. Two things to consider are facility location (e.g., is the store close to a
railroad track or a highway where trains or heavy trucks pass on a regular schedule) and unit location (e.g., is
it next to a heavy door that slams shut), etc. In the case of facility location not much can be done, although it
may be possible to dampen the vibrations by placing the unit on a rubber pad. In the case of unit location,
consider an alternate location for the unit. Avoid moving the unit long distances without the load cell shim in
place. Excessive jarring of the unit in movement may damage the load cell.
If erratic or inaccurate batch weights occur consistently, it is likely that one or more of the batch weight
selectors may have been improperly programmed. Verify that the selectors have been properly programmed
in accordance with the instructions in Appendix A.
1.2.3 Failures to Function and Improper Functioning
The probable causes of this category of problem are improper connections and failed components. If you
have not already done so, you should read Section 1.1 (the system theory of operation) before continuing
with this section.
The paragraphs that follow identify the general types of failures that may be encountered and the possible
causes of each. Troubleshooting Guides at the end of the chapter provide step-by-step problem-isolation
procedures.
Failure of the unit to initialize when ON/OFF switch is placed in ON position can be caused by failure of a
component in the input power circuit or failure of the controller. When the ON/OFF switch is placed in the
ON position the two error conditions that may be encountered are that the drum motor does not activate at all
or it runs continuously.
Normally when the ON/OFF switch is placed in the ON position, the drum motor briefly activates (approximately 2 seconds) then stops. If the drum motor runs continuously as soon as the ON/OFF switch is placed
in the ON position, there are three probable causes. The first is that 12VDC is not getting to the controller
1-3
from the motor interface board. The second is that the controller has failed. The third is that controller
signals are not reaching the motor drive circuits.
If the drum motor does not activate at all, the probable cause is failure of a component in the input power
circuit.
Failures of the dispense chute door to open or close are caused by problems with the Hall effect sensors, the
proximity sensor, the dispense motor, the motor interface board, or the controller. The primary indication of
a problem involving the “closed” Hall effect sensor (J8 on the controller) is the partial closing of the door
following the “zero” routine or the removal and replacement of a basket during normal operation.
A failed “open” Hall effect sensor (J8 on the controller) is indicated by the normal “zeroing” of the unit and
loading of the dispense chute, but failure of the door to open to dispense the fries. A failed proximity sensor
will give the same indication, so care must be taken to differentiate between the two.
If the Hall effect sensors have been ruled out as the cause of the failure to function, the most likely cause is a
motor-related problem.
Failures of the drum motor to start or stop are caused by problems in the controller, load cell, motor interface board, or drum motor and the associated wiring. If the motor fails to stop, the problem is not with the
motor. It may be with the controller, the load cell, or the motor interface board.
1.3 Troubleshooting Guides
The Troubleshooting Guides in the following pages provide a systematic method for isolating specific problems and the action(s) to take to correct them. When using the guides to isolate the cause of a particular
problem, begin with the first probable cause and work down. Also, don’t forget the Operator Troubleshooting Guides found in the Operator’s Manual. Most problems likely to be encountered are covered in these
two sets. However, don’t hesitate to call the
24-FRYER (1-800-243-7937) if you need assistance in solving a particular problem.
Frymaster
Technical Services Department at 1-800-
1-4
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