Vollrath Stoelting U412 Series Service Manual
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Vollrath Stoelting U412 Series Service Manual

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Model U412 Series
SERVICE MANUAL
Manual No.
513630
Rev.2

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  • Page 1 Model U412 Series SERVICE MANUAL Manual No. 513630 Rev.2...
  • Page 3 This manual provides basic information about the machine. Instructions and suggestions are given covering its operation and care. The illustrations and specifi cations are not binding in detail. We reserve the right to make changes to the machine without notice, and without incurring any obligation to modify or pro- vide new parts for machines built prior to date of change.
  • Page 4 A Few Words About Safety Safety Information Safety Alert Symbol: Read and understand the entire manual before This symbol Indicates danger, warning or caution. operating or maintaining Stoelting equipment. Attention is required in order to avoid serious per- sonal injury. The message that follows the symbol This manual provides the operator with information contains important information about safety.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS Section Description Page Description and Specifi cations Description ....................1 Specifi cations ..................... 2 Modes of Normal Operation ............... 3 Mix Level Indicators ..................5 Storage Refrigeration ................. 5 Operation During Sensor Failure ..............5 Motor Profi le Cutout Compensation ............5 Installation Instructions Safety Precautions ..................
  • Page 6 Section Description Page Maintenance and Adjustments Freezer Adjustment ..................21 Product Consistency Adjustment ..............21 Locking the Control Panel ................21 Obtaining Readings and Modifying Settings (Service Personnel Only) ..21 Readings (Service Personnel Only) ............22 Adjustments (Service Personnel Only) ............23 Other Settings (Service Personnel Only) ............
  • Page 7 Section Description Page Electrical and Mechanical Control Systems IntelliTec Controller ..................39 Contactors ....................39 Drive Motor ....................40 Capacitors ....................40 Gearbox ...................... 41 Condenser Fan Motor (Air-Cooled Only) ............ 42 Cab Condenser Fan Motor ................. 42 Switches ..................... 43 Spigot Switch .......................

  • Page 9: Description And Specifications

    SECTION 1 DESCRIPTION AND SPECIFICATIONS DESCRIPTION The U412 is an ultra high capacity fl oor model shake machine. It is equipped with fully automatic controls to provide a uniform product. This manual is designed to assist qualifi ed service personnel and operators with instal- lation, operation and maintenance of the U412 machine.

  • Page 10: Specifications

    SPECIFICATIONS Model SU412 Dimensions Machine with crate width 19-1/8’’ (48,6 cm) 27’’ (68,6 cm) height 67’’ (170,2 cm) 78’’ (198,1 cm) depth 38-3/4’’ (98,4 cm) 48’’ (121,9 cm) 450 lbs (204,1 kg) 650 lbs (294,8 kg) Weight Electrical 1 Phase, 208-240 VAC, 60Hz 19A minimum circuit ampacity overcurrent protection...

  • Page 11: Modes Of Normal Operation

    1.3 MODES OF NORMAL OPERATION Following are details of the operational modes on the U412. NOTE: The preset amounts, times, and temperatures listed below are references to actual settings on the IntelliTec control. Refer to Table 1-1 on page 6 for details on each setting.
  • Page 12 The “Standby Mode” maintains product quality during slow times, while minimizing reactivation time. This mode lasts for a preset time (Stb Time). Once this time has been reached without user interruption, the control moves into the “Sleep 1 Mode”. Refer to Figure 1-4 for a graphical representation of the “Standby Mode”.

  • Page 13: Mix Level Indicators

    H. CLEAN MODE When the CLEAN button is pressed, freezing cylinder refrigeration stops, the drive motor starts and will run for 20 minutes and a 5 minute countdown timer is displayed. After the time has elapsed, an optional audible alarm will sound if this accessory has been installed.
  • Page 14 IntellITec Control Setting Specifi cations Basic Menu DISPLAY Value MODE DEFINITION CutOut Serve Amp draw setting for cut out Cut In T 26.5°F Serve Temperature setting for cut in Cycles Serve Freezing cycles before going into Standby Mode Stir On 15 sec Serve Stir-only on time...

  • Page 15: Installation Instructions

    SECTION 2 INSTALLATION INSTRUCTIONS Uncrate the machine. 2.1 SAFETY PRECAUTIONS Install the four casters. Turn the threaded end Do not attempt to operate the machine until the safety into the machine until no threads are showing. To precautions and operating instructions in this manual are level, turn out casters no more than 1/4”...

  • Page 16: Mix Pump

    6” (15cm) Figure 2-2 Mix Hose Installation Allow the remaining 6” (15cm) of tubing to feed 2.5 MIX PUMP through pump until the hose adapter prevents A. MIX PUMP HOSE INSTALLATION further feeding. Follow the steps below to install the mix pump hose in Turn the pump off.
  • Page 17 Figure 2-3 Mix Pump Connections for Standard Mix Container Connect the free end of the tubing to the mix check Slide the hose clip over free end of 3/8” (9,5mm) valve. Observe the direction of the check valve ID plastic food grade tubing. Attach the free end fl...

  • Page 18: Mix Low Level Indicator Adjustment

    Repeat steps 1 to 3 for the middle port and for C. MIX LOW LEVEL INDICATOR ADJUSTMENT the right port of the mix inlet manifold. The sensitivity of the “Mix Low” indication that displays on Place three mix bags into the mix container. the control panel can be adjusted to operator preference.

  • Page 19: Initial Set-Up And Operation

    SECTION 3 INITIAL SET-UP AND OPERATION 3.1 OPERATOR’S SAFETY PRECAUTIONS 3.2 OPERATING CONTROLS AND INDICATORS SAFE OPERATION IS NO ACCIDENT; observe these Before operating the machine, it is required that the op- rules: erator know the function of each operating control. Refer to Figure 3-1 for the location of the operating controls on Know the machine.
  • Page 20 C. SPIGOT SWITCH J. DRIVE MOTOR OVERLOAD The spigot switch is mounted to the spigot cam assembly The internal drive motor overload will trip if the drive behind the header panel. When the spigot is opened to motor is overloaded. It will reset after approximately 10- dispense product, the spigot switch opens and the “Serve 12 minutes.

  • Page 21: Disassembly Of Machine Parts

    3.3 DISASSEMBLY OF MACHINE PARTS B. REMOVE FRONT DOOR AND AUGER Make sure the Main Freezer Power Off/On switch is in the OFF position WARNING Remove the knobs on the front door and remove Moving machinery can grab, mangle and dismem- the door by pulling it off the studs.

  • Page 22: Sanitizing Machine Parts

    Place all front door and auger parts in clean 90° to 3.7 ASSEMBLING MACHINE 110°F (32°C to 43°C) water and wash thoroughly To assemble the machine parts, refer to the following steps: (four sink procedure only). NOTICE Petrol-Gel sanitary lubricant or equivalent must be CAUTION used when lubrication of machine parts is specifi...

  • Page 23: Sanitizing

    Figure 3-7 Blender Shroud Pin Alignment 3.8 SANITIZING Figure 3-6 Front Door Assembly Sanitizing must be done after the machine is clean and Insert the air bleed valve into the back of the front just before the machine is fi lled with mix. Sanitizing the door.

  • Page 24: Initial Freeze Down And Operation

    3.9 INITIAL FREEZE DOWN AND OPERATION Every Stoelting soft serve machine needs to be set on site. Air Bleed The following adjustment will provide optimal product Valve consistency while prolonging product life. NOTE The machine is designed for correct operation in ambient temperatures between 50°F and 110°F.

  • Page 25: Initial Freeze Down

    After entering 8.0, press SET to save this value. Press the SET button to save the value. The LCD The LCD will read “CutOut Set -- OK”. will read “CutOut Set -- OK”. Press the SEL button. The LCD will read “CutOut Press the SEL button.

  • Page 26: Mix Information

    Place the mix pump switch in the ON position. NOTE Place a container under the spigot and open the The machine has a standby and sleep mode. After spigot to allow the mix to fl ush out about 8 ounces a preset number of freezing cycles, it will enter the (0.23 liters) of sanitizing solution and liquid mix.

  • Page 27: Mix Pump Cleaning

    Place the Main Power OFF/ON and Freezing Cylinder OFF/ON switches in the ON position Air/Mix to and press the CLEAN button. Allow the auger to Air Line Freezing agitate for 5 to 10 minutes. Cylinder Remove the suction tube from the mix container. Open the spigot to remove the mix remaining in the freezing cylinder.
  • Page 28 Carefully inspect each part for wear or damage. Replace worn or damaged parts. Wash the feed tube and the air tube in the cabinet with 90° to 110°F detergent water and brushes provided. Rinse with clean, 90° to 110°F water. Prepare two gallons (7.5 liters) of sanitizing solution using a USDA certifi...

  • Page 29: Maintenance And Adjustments

    SECTION 4 MAINTENANCE AND ADJUSTMENTS FREEZER ADJUSTMENT LOCKING THE CONTROL PANEL This section is intended to provide maintenance personnel The IntelliTec control has a tamper proof mode to prevent with a general understanding of the freezer adjustments. unauthorized use. When set, all buttons on the control It is recommended that any adjustments in this section panel are disabled.

  • Page 30: Readings (Service Personnel Only)

    IMPORTANT: Supply V (VAC) A calculated input voltage is recorded. Before making changes to any settings, record the original values. If the setting changes do not ERROR CODE READINGS achieve desired results, return settings to their The following details are recorded under the ERRCODES original values.

  • Page 31: Adjustments (Service Personnel Only)

    RUN STATISTICS Cut In T (°F) In addition to dynamic readings and recorded After the consistency value has been determined, error code details, the IntelliTec control records the Cut In T value can be adjusted. The Cut In rolling averages of run statistics. Following are the T is the temperature of the refrigerant gas in the readings available under the RUNSTATS menu: evaporator at the front of the freezing cylinder.

  • Page 32: Overrun Adjustment

    Off Time (sec) Cab Off Increasing this value will increase the time between If the Refriger value is set to Cabinet and the freezing cycles in “Standby Mode” and result in temperature sensor in the cabinet fails, this setting an increase of product temperature in the barrel. determines the time between refrigeration cycles.

  • Page 33: Mix Pump Hose Reposition

    Turn the mix pump switch to the OFF position. Disconnect power sources/circuit breakers. Remove the back panel from the freezer. On the air compressor side of the pump, locate the long/slender piston rocking arm. The rocking arm downward travel is limited by a stationery cam.

  • Page 34: Cab Temperature Adjustment

    Connect the new mix pump hose to the pickup Press the up arrow button () once to navigate hose adapter using the small clamp. to the CabCutIn value. Record this value. Feed one end of the mix pump hose into the IMPORTANT: pickup hose side (left) of the black cover.

  • Page 35: Condenser Cleaning (Air-Cooled Freezers)

    If an adjustment is necessary, loosen the four Daily checks motor plate retaining nuts, adjust belt tension Check for any unusual noise or condition and then retighten the four nuts. repair immediately. Using a straightedge, check that the drive motor Monthly checks pulley is aligned with the speed reducer pulley.

  • Page 37: Refrigeration System

    SECTION 5 REFRIGERATION SYSTEM 5.1 REFRIGERATION SYSTEM NOTE The U412 refrigeration system has two functions: For qualifi ed service personnel only. Anybody work- ing with refrigerants must be certifi ed as a Techni- Medium-Temperature - Maintaining product cian TYPE I as required by 40 CFR 82 Subpart F temperature in the cab unit and providing and hold all State and/or local refrigerant handling refrigeration to the mix transfer line.

  • Page 38: Refrigerant Charging

    A. Refrigerant Recovery NOTE Disconnect the machine from the electrical supply If evacuation is not completed after 20 minutes, before removing any panels for servicing. press the Push To Freeze button again. This will keep the solenoid valves open. Remove all panels. If the system will not maintain a standing vacuum Connect the recovery unit to the suction and test with the vacuum pump off (gauge increases...

  • Page 39: Compressor

    Connect an ohmmeter to the C and R terminals. 5.4 COMPRESSOR Resistance through the run winding should be The U412 has a scroll type compressor (Refer to Figure 1.81Ω ±10%. 5-2). This compressor type uses two spiral shaped scrolls Connect ohmmeter to terminals C and S. to compress gas.

  • Page 40: Condenser

    5.6 EVAPORATOR WARNING The U412 has a freezing cylinder evaporator, a cab evaporator, and a mix line evaporator. Hazardous voltage The Main Freezer Power switch must be placed in Evaporator Testing the OFF position when disassembling for servicing. The evaporator can be checked for leaks using the bubble The machine must be disconnected from electrical test or using a leak detector.

  • Page 41: Check Valve

    If the pressure reading is higher than expected, Install bulb on suction line exiting the evaporator check to see if there is an overcharge of refrigerant. using existing clamp. The bulb has an indent that must be placed against the tubing. If the pressure reading is lower than expected, check to see if there is a low refrigerant charge NOTE...

  • Page 42: Hot Gas Bypass

    Disconnect cooling: Air-Cooled - Disconnect evaporator fan Water-Cooled - Shut off water supply High pressure cutout should trip when pressure reaches 445 psig ±9. High Pressure Cutout Removal Remove the left side panel. Recover refrigerant charge per instructions in Section 5.2. Leave the suction and discharge ports open to prevent pressure buildup during removal.

  • Page 43: Evaporator Pressure Regulator (Epr)

    Wait 2 minutes to ensure pressure remains stable. Open the cab door and place a piece of tape on the cab door interlock switch. Hand-tighten seal cap to valve. NOTE Hot Gas Bypass Removal The cab door remains open for this test. The rela- Remove the side and rear panels.

  • Page 44: Solenoid

    Evacuate and recharge system per instructions Water Valve Adjustment in Section 5.2. Remove the back panel. Turn on the water and check for leaks in the water Connect a gauge to the compressor discharge lines with the refrigeration system running. access fi...

  • Page 45: Filter Drier

    Remove the heat sink from the valve. Solenoid Testing When activated, a solenoid coil produces a magnetic fi eld. Replace insulation around valve. This fi eld can be detected by placing the tip of a metal Replace the fi lter drier. Refer to Section 5.8 for screwdriver close to the retaining screw on the solenoid details.

  • Page 46: Capillary Tube

    5.10 CAPILLARY TUBE 5.11 CAB UNIT The capillary tube meters refrigerant fl ow in the mix line The IntelliTec control is programmed to handle refrigeration evaporator (Refer to Figure 5-13). The amount of fl ow is of the cabinet independently from the barrel. The control dependent on the length and ID of the capillary tube as maintains cabinet temperature between two preset values well as the refrigerant charge.

  • Page 47: Electrical And Mechanical Control Systems

    SECTION 6 ELECTRICAL AND MECHANICAL CONTROL SYSTEMS NOTE The wiring diagram is available in Section 8. INTELLITEC CONTROLLER The IntelliTec control is Stoelting’s most advanced con- troller. It combines all of the best features of previous controllers with advanced sensing and troubleshooting capabilities.

  • Page 48: Drive Motor

    A. CONTACTOR TESTS The following tests will show if a contactor is working properly. Protective Open header panel and visually check the Shield IntelliTec control board. Check for a signal going to contactor. When the spigot is opened or the Push To Freeze button is pressed, the DRV LED on the control board will light up.

  • Page 49: Gearbox

    B. CAPACITOR REPLACEMENT Disconnect machine from electrical supply before Capacitor removing any panels for servicing. Place the Main Power OFF/ON switch and the Freezing Cylinder OFF/ON switch in the OFF position. Remove leads from the capacitor terminals. Using insulated pliers, discharge the capacitor by connecting a 20KΩ...

  • Page 50: Condenser Fan Motor (Air-Cooled Only)

    Use a Burroughs Belt Tension Gauge to set the CAB CONDENSER FAN MOTOR tension for the drive belt. Set the belt tension to A. FAN MOTOR REPLACEMENT 15-25 lbs. Shut the machine down and remove mix from the If an adjustment is necessary, loosen the four freezing barrel and cab.

  • Page 51: Switches

    SWITCHES SPIGOT SWITCH TESTING - ELECTRICAL Disconnect the switch from the circuit by A. SPIGOT SWITCH unplugging the connector. The spigot switch is a normally closed, held open switch. Check resistance readings across the common When the spigot is pulled, the spigot switch sends a signal (COM) and normally closed (NC) terminals.

  • Page 52: Blender Activation Switch

    Disconnect the connector from the switch and remove the switch. Install the replacement switch onto the handle assembly. Do not fully tighten the retaining screws at this time. Attach Pressure Using a pencil, mark the spigot glide 1/4” from Gauge the spigot housing.

  • Page 53: Potential Relay

    POTENTIAL RELAY 6.11 SPINNER SPEED CONTROL HARNESS The potential relay senses voltage produced by the start The blender speed on the SU412 and STU412 machines winding. When the rated pick-up voltage is reached, the is controlled by a wire harness behind the header panel. relay will open and drop the start capacitor from the circuit.

  • Page 55: Troubleshooting Error Codes

    SECTION 7 TROUBLESHOOTING breakdown. Another common cause results from 7.1 ERROR CODES a restriction preventing mix from entering the When the machine experiences a problem, one of the freezing cylinder. Check the mix in the cabinet. If following error codes will be displayed on the control the level mix is low, add mix.
  • Page 56 Error Code 5 - Freezing Cylinder Sensor Error Code 6 - Hopper Sensor (single hopper machines) The Freezing Cylinder Sensor Error (E5) indicates The Hopper Sensor Error (E6) will not occur on a failure of the barrel sensor or an extreme out of the U412 machine.
  • Page 57 Error Code 11 - Low Temperature The Low Temperature Error (E11) occurs when the temperature of the gas refrigerant at the freezing cylinder sensor falls below -20°F. Although the machine will not shut down, the active freezing cycle will immediately end. This error usually occurs when the machine continues to run in a low mix condition or if the machine runs out of mix.

  • Page 58: Troubleshooting - Machine

    7.3 TROUBLESHOOTING - MACHINE PROBLEM POSSIBLE CAUSE REMEDY 1. Power to machine is off. 1. Check power to machine. Drive motor (auger) 2. Low line voltage. 2. Check, must be ±10% of nameplate voltage. “kicks-out”, or 3. Product too hard. 3.

  • Page 59: Troubleshooting - Mix Pump

    7.4 TROUBLESHOOTING - MIX PUMP PROBLEM POSSIBLE CAUSE REMEDY 1. Power to pump is off. 1. Supply power to pump. 2. Low voltage. 2. Check for low voltage. 3. Mix pump hose jammed inside black 3. Disconnect pump from power source. Remove cover/clamp.
  • Page 60 PROBLEM POSSIBLE CAUSE REMEDY 1. Mix pump hose service life is 1. Reposition/replace mix pump hose. exceeded. 2. Out of mix. 2. Replenish mix supply. Overrun too high. 3. Overrun setting too high. 3. Decrease overrun setting. 4. Pick-up leg of mix pump hose is 4.

  • Page 61: Replacement Parts

    SECTION 8 REPLACEMENT PARTS AUGER SHAFT AND FRONT DOOR PARTS Part Number Description Quantity 162155 Scraper Blade (6.875” Long) 482004 Knob (Air Bleed Valve) 482019 Knob - Front Door (Black) 624520 O-Ring - Air Bleed Valve - Black 624614 O-Ring - Spigot - Black 624678 O-Ring - Rear Seal - Black 625314...

  • Page 62: Blender Parts And Trays

    BLENDER PARTS AND TRAYS 744252 417010 744287 Part Number Description Quantity 274031 Blender Agitator Collar (SU412) 417010 Grid - Drip Tray 521026 Blender Agitator (SU412) 522839 Blender Motor (SU412) 674147 Blender Shaft (5”) (SU412) 674174 Blender Shaft (7.6”) (SU412) 674183 Blender Shaft (6.6”) (SU412) 681518 Shield - Plastic Swing (SU412)

  • Page 63: Cab Tubing Assembly

    CAB TUBING ASSEMBLY Part Number Description Quantity 264235 Clamp - Metal (1/4” ID Tubing) (Cab) 264241 Clamp - Metal (1/2” ID Tubing) (Cab) 264243 Clamp - Metal (3/8” ID Tubing) (Cab) 375819 Elbow - Barbed (3/8”- 1/4”) (Cab) 376041 Tee Connector - 3-Way (Stainless) (Cab) 558109 Mix Container Only (Cab) 624607...

  • Page 64: Spigot Cam Assembly

    SPIGOT CAM ASSEMBLY Part Number Description Quantity 428045 Knob - Spigot Handle (Black) 570000 Pin - Cotter (Spigot Cam) 570961 Pin - Cotterless Clevis (Spigot Cam) 695705 Spring - Blender Activation (SU412) 696044 Spring - Torsion (Spigot Cam) 718773 Switch - Spigot Cam 719099 Switch - Limit (Spinner) (SU412) 2183163...

  • Page 65: Front Panel

    FRONT PANEL 332541 719025-SV 718895 493041 Part Number Description Quantity 332541 Board - Display Module (Display Only) 493041 Indicator Light (Cab On - Off) 718895 Switch - Rocker (Cab On-Off) 719025-SV Switch - Membrane Strip PART KITS Part Number Description Quantity 128295 Rocker Arm Assembly w/Screw (Cab)

  • Page 66: Pump Parts

    PUMP PARTS Part Number Description Quantity 150809 Belt (Cab) 369037 Fitting - Flared Brass - Air Inlet (Cab) 376035 Tee Connector - Air Pressure Switch (Cab) 432003-SV Valve Head Only w/Tubes (Pump) (Cab) 522229 Motor - Pump (Cab) 538306 Nut - Motor Mounting (Cab) 598025 Pulley - Large (Cab) 644065...
  • Page 67 PUMP PARTS (CONTINUED)

  • Page 68: Cab Interior

    CAB INTERIOR Part Number Description Quantity 128311 Hinge - Door (Top & Bottom) (Cab) 128312 Mix Container Holder Assembly w/Rollers (Cab) 162048 Blade - Fan (Evaporator) (Cab) 266018 Clip - “J” (Hose Holder) (Cab) 266076 Clip - Bag In Box (Cab) 284095 Evaporator (Cab) 396449...

  • Page 69: Header Panel - Electrical

    HEADER PANEL - ELECTRICAL 295017 521686-230 765214 718537 688026 202198 718532 230638 231057 618180 744142 Part Number Description Quantity 202198 Switch - Blender Power & Reset (SU412) 229116 Cable - Phone (control Board to Display Board) 230638 Capacitor - Start (#282047 Compressor) 231057 Capacitor - Run (#282047 Compressor) 295017...

  • Page 70: Left Hand Side

    8.10 LEFT HAND SIDE 284085 162077 522291 614232 342004 493042 598245 231101 762454 152237 763422 458003 598072 522858-SV 762978 Part Number Description Quantity 152237 Belt - Gripnotch (AX35) (50 Hz) / (60 Hz Ser. #28561 Plus) 152245 Belt - V (4L350) (60 Hz) (Ser. #0- #28560) 162077 Blade - Fan (Air-Cooled Condenser) 231078...

  • Page 71: Right Hand Side

    8.11 RIGHT HAND SIDE 2202439-SV 763423 272065 762275 762454 762329 763482 763422 762457-SV Part Number Description Quantity 272065 Valve Coil - Solenoid (#763723 Valve) 762275 Valve - Magna Check (Cab) 762329 Valve - Magna Check (EPR) (Cab) 762454 Valve - Expansion 762457-SV Valve - Expansion (w/Orifi...

  • Page 72: Rear

    8.12 REAR 718794 762359 763017 737039 282047 558004 Part Number Description Quantity 282047 Compressor - 1 PH - 60 Hz (Scroll) (No Capacitors) 282059 Compressor - 1 PH - 50 Hz (Scroll) (No Capacitors) 558004 Condensate Pan 718794 Switch - High Pressure Cutout 737039 Thermostat - Discharge Line 762359...

  • Page 73: Brushes, Decals And Lubrication

    8.13 BRUSHES, DECALS AND LUBRICATION Part Number Description Quantity 208135 Brush - 4” X 8” X 16” (Barrel) 208380 Brush - 1/4” X 3” X 14” 208387 Brush - 1/2” X 5” X 24” 208465 Brush - 1” X 3-1/2” X 18” 208467 Brush - 3/8”...

  • Page 74: Refrigeration Diagram And Wiring Diagram

    8.15 REFRIGERATION DIAGRAM AND WIRING DIAGRAM...
  • Page 77 DOMESTIC WARRANTY (Including Mexico) SOFT SERVE / SHAKE EQUIPMENT 1. Scope: PW Stoelting, L.L.C. (“Stoelting”) warrants to the first user (the “Buyer”) that the freezing cylinders, hoppers, compressors, drive motors, speed reducers, and augers of Stoelting soft serve / shake equipment will be free from defects in materials and workmanship under normal use and proper maintenance appearing within five (5) years, and that all other components of such equipment manufactured by Stoelting will be free from defects in material and workmanship under normal use...

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