ZOLL 330 Service Manual

ZOLL 330 Service Manual

Multifunction aspirator
Hide thumbs Also See for 330:
Table of Contents

Advertisement

ZOLL 330 Multifunction Aspirator
Service Manual
9650-000278-01 Rev. B

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the 330 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Summary of Contents for ZOLL 330

  • Page 1 ZOLL 330 Multifunction Aspirator Service Manual 9650-000278-01 Rev. B...
  • Page 2 The issue date for the ZOLL 330 Multifunction Aspirator Operator’s Guide (REF 9650-000278-01 Rev. B) is February, 2018. Copyright © 2018 ZOLL Medical Corporation. All rights reserved. ZOLL, AEV, Eagle II, EMV+, and Smart Help are trademarks and/or registered trademarks of ZOLL Medical Corporation in the United States and/or other countries.
  • Page 3: Table Of Contents

    Testing ......................... 1-4 Instructions ......................1-5 Testing ......................... 1-5 Chapter 2 Troubleshooting Overview..........................2-1 330 Multifunction Aspirator Service Codes ................. 2-1 About Service Codes ....................2-1 Service Code List ......................2-2 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 4 UIM Stack Assembly Replacement ................3-27 Required Tools and Other Items ................ 3-27 Instructions ......................3-27 Chapter 4 Replacement Parts Overview..........................4-1 Available Replacement Parts....................4-2 Determining Replacement Part Item Number ............. 4-2 Replacement Part List ....................4-15 www.zoll.com 9650-000278-01 Rev. B...
  • Page 5 Chapter 5 Functional Description Appendix A Maintenance Test Checklist Overview..........................A-1 ZOLL 330 Multifunction Aspirator Maintenance Checklist ..........A-2 Appendix B Specifications General ..........................B-1 Device Classification......................B-3 Emissions and Immunity Compliance .................B-4 Basic Safety and Essential Performance................B-5 Electrical ..........................B-5 Class I .........................B-5 Class II ........................B-5 9650-000278-01 Rev.
  • Page 7: Product Description

    Preface This chapter provides general information about the ZOLL 330 Multifunction Aspirator and the ZOLL 330 Multifunction Aspirator Service Manual. Specifically, this chapter provides: A brief description of the aspirator • Information about this manual (ZOLL 330 Multifunction Aspirator Service Manual) •...
  • Page 8: Related Documents

    Service Manual Updates An issue or revision date for this manual is shown inside its front cover. If more than 3 years have elapsed since this date, contact ZOLL Medical Corporation to determine if additional product information updates are available.
  • Page 9 Manufacturer: This symbol shall be adjacent to the name and address of the manufacturer. Manufacture Date: Manufacture Date Symbol identifies the device’s date of manufacture. Consult Instruction: Consult the instructions for use or operation manual. Refer to instruction manual. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual Preface-3...
  • Page 10: Symbols On The Aspirator's Graphical User Interface (Gui)

    Plot: Identifies active off-screen plot available. Plot: Identifies active off-screen plot has been selected. External Power: Indicates the device is operating using an external power source. No External Power: Indicates the device is operating without an external power source. Preface-4 www.zoll.com 9650-000278-01 Rev. B...
  • Page 11: Conventions

    Warning statements alert you to conditions or actions that can result in personal injury or death. Caution Caution statements alert you to conditions or actions that can result in damage to the device. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual Preface-5...
  • Page 12: Abbreviations And Acronyms

    HME - Heat and Moisture Exchanger VAC - Volts AC HMEF - Heat and Moisture Exchanger/Bacterial Viral VDC - Volts DC filter combined Hz – Hertz (as in frequency, cycles per second) ID - Internal Diameter L - Liters Preface-6 www.zoll.com 9650-000278-01 Rev. B...
  • Page 13: General Warnings

    The information contained herein is restricted for use by personnel certified by ZOLL • Medical Corporation in the care and servicing of this product. ZOLL does not authorize or assume any obligations resulting from unauthorized servicing of its products nor will it be held liable for any injuries or damages incurred therefrom.
  • Page 14: Technical Service

    • Returning a Device for Service Before sending a unit to the ZOLL Technical Service Department for repair, obtain a service request (SR) number from the service representative. The Lithium ion battery should remain inside the unit. Follow directions provided on the Return Materials Authorization (RMA).
  • Page 15: Performing Maintenance Tests

    Chapter 1 Performing Maintenance Tests Overview This chapter includes procedures for maintenance tests. It is necessary to perform maintenance tests to ensure that the 330 Multifunction Aspirator functions properly. This chapter describes the following maintenance tests: Cosmetic and Hardware • Performance •...
  • Page 16: 330 Pm Test Kit

    330 PM Test Kit To perform maintenance tests, you need to assemble the test setup from items contained in the 330 PM (Preventive Maintenance) Test Kit (REF: 8600-000020-01). The 330 PM Test Kit contains the following item. Jar, disposable with Lid (REF: 410-0004-00) •...
  • Page 17 Main Menu. Turn the Dial right and on screen. left multiple times and in multiple increments. Buzzer Check Power aspirator on with external Buzzer is audible during alarm. power connected. Unplug external power to generate an alarm. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 18: Instructions

    Pass Range:(366-434) Pass Range:(366-434) 2.12 50 mm Hg Pass Range:(44-56) Pass Range:(44-56) 2.13 200 mm Hg Pass Range:(182-218) Pass Range:(182-218) 2.14 90 mm Hg Pass Range:(80.8-99.2) Pass Range:(80.8-99.2) 2.15 110 mm Hg Pass Range:(99.2-120.8) Pass Range:(99.2-120.8) www.zoll.com 9650-000278-01 Rev. B...
  • Page 19: Instructions

    Value (OFF) Intermittent Pass Range: Pass Range: Maximum Vacuum (90-100) (-2-2) (On): ± (8 % of Setting + 2 mm Hg) Minimum Vacuum (Off): 0 mm Hg (± 2 mm Hg) 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 21: Chapter 2 Troubleshooting

    This chapter contains a list of error messages that users may see if the unit is not operating properly. If the errors you encounter are not listed below, call ZOLL Medical Corporation’s Technical Service Department for further assistance. (See the “Technical Service” section the Preface.)
  • Page 22: Service Code List

    Troubleshooting Service Code List The following is a list of the 330 Multifunction Aspirator that may appear on your display. The table provides the Service Code number, associated alarm name, description, and information on what you can do to correct the situation.
  • Page 23 If there are any questions, contact the service center for additional information. Mitigation/Info: None – No LCD Display. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 24 2111 Self Check Failure - Valve Fault Alarm occurs when the device detects a potential valve fault, the vacuum level is not reduced during the intermittent mode of operation. Mitigation/Info: "Manually Aspirate Patient", **Contact Service Center** www.zoll.com 9650-000278-01 Rev. B...
  • Page 25 Mitigation/Info: Power System, Power Management Fault, Monitor Power Source, **Replace/Service Aspirator** 3480 Self Check Failure - Hardware Compatibility Alarm occurs when the device detects a change in hardware (mismatched serial numbers). Mitigation/Info: Hardware Compatibility Failure, **Replace/Service Aspirator** 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 27: Replacement Part Installation

    Chapter 3 Replacement Part Installation Overview This chapter provides instructions on how to disassemble and reassemble the 330 Multifunction Aspirator unit, and includes the following sections: Required Equipment • Safety Precautions • Battery Compartment Replacement • Battery Compartment Cover Replacement •...
  • Page 28: Safety Precautions

    Chapter 1 of this manual • Chapter 4 of this manual (for Service Kits requiring HiPot testing) • ZOLL 330 Multifunction Aspirator Operator’s Guide • ZOLL Remote Calibration System Operation Manual • Caution Replacement part installations should be done in an ESD controlled environment since internal components are susceptible to damage from static discharge..
  • Page 29: Battery Compartment Replacement

    Clean screws and apply Vibra-Tite to each of the four 6-32 x 5/16 screws, re-insert, and then tighten. Torque: 9 in lbs. Bit Size: #2 Phillips head 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–3...
  • Page 30 Clean screws and apply Vibra-Tite to each screw, re-insert, and then tighten the four 6-32 x 5/16 screws. Torque: 9 in lbs Bit Size: #2 Phillips Perform a functional test to confirm proper operation of the aspirator. 3–4 www.zoll.com 9650-000278-01 Rev. B...
  • Page 31: Battery Compartment Cover Replacement

    Clean screws and apply Vibra-Tite to each screw, re-insert, and then tighten the four 6-32 x 5/16 screws. Torque: 9 in lbs Bit Size: #2 Phillips Perform a functional test to confirm proper operation of the aspirator. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–5...
  • Page 32: Battery Replacement

    Clean screws and apply Vibra-Tite to each screw, re-insert, then tighten the four 6-32 x 2 1/4 screws to secure the battery. Torque: 9 in lbs Bit Size: #2 Phillips Perform a functional test to confirm proper operation of the aspirator. 3–6 www.zoll.com 9650-000278-01 Rev. B...
  • Page 33: Back Cover Replacement

    “long side”, found on the top of the baffle is on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test to confirm proper aspirator operation. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–7...
  • Page 34: Power Input Assembly Replacement

    Remove the back cover by pulling it from the aspirator. Remove the 4-40 x 1/4 screw on the dovetail stabilizer bracket. Save this screw. Flip the aspirator over and remove the front case assembly by lifting it straight up away from the aspirator chassis. 3–8 www.zoll.com 9650-000278-01 Rev. B...
  • Page 35 Bit Size: #2 Phillips Re-assemble the battery compartment cover. Clean screws and apply Vibra-Tite to each screw and tighten the four 6-32 x 5/16 screws. Torque: 9 in lbs Bit Size: #2 Phillips 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–9...
  • Page 36 “long side”, found on the top of the baffle is on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test to confirm proper aspirator operation. 3–10 www.zoll.com 9650-000278-01 Rev. B...
  • Page 37: Exhaust Muffler Block And Baffle Replacement

    Note: Do not compress the muffler foam. Remove the two 6-32 x 3/8 screws and washers from the Exhaust Muffler Block, and then pull the Exhaust Muffler Block from the chassis. Save these screws. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–11...
  • Page 38 Position the Intake Plate on the Exhaust Muffler Baffle. Clean screws and apply Vibra- Tite to each of the four 8-32 x 3 screws, re-insert, and tighten. Torque: 14 in lbs Bit Size: #2 Phillips 3–12 www.zoll.com 9650-000278-01 Rev. B...
  • Page 39: Exhaust Muffler Foam Replacement

    Position the Intake Plate on the Exhaust Muffler Baffle. Clean screws and apply Vibra- Tite to each of the four 8-32 x 3 screws, re-insert, and tighten. Torque: 14 in lbs Bit Size: #2 Phillips 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–13...
  • Page 40: Power Interface Module Installation

    Flip the aspirator over and remove the front case assembly by lifting it straight up away from the aspirator chassis. Remove the battery compartment cover by unscrewing the four 6-32 x 5/16 screws. Save these screws. 3–14 www.zoll.com 9650-000278-01 Rev. B...
  • Page 41 Bit Size: #2 Phillips Re-assemble the battery compartment cover. Clean screws and apply Vibra-Tite to each screw and tighten the four 6-32 x 5/16 screws. Torque: 9 in lbs Bit Size: #2 Phillips 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–15...
  • Page 42 “long side”, found on the top of the baffle is on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test to confirm proper aspirator operation. 3–16 www.zoll.com 9650-000278-01 Rev. B...
  • Page 43: Smart Aspirator Module (Sam) Replacement

    Remove the battery compartment cover by unscrewing the four 6-32 x 5/16 screws. Save these screws. Remove the battery by unscrewing the four 6-32 x 2 1/4 screws and detaching the plug from its locking latch. Save these screws. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–17...
  • Page 44 Turn the chassis to face it’s opposite side (so that you can see the vacuum pump and tubing). Connect the clear tubing from the SAM board to the brass manifold barb near the center of the chassis. Note: Take precautions not to crack or otherwise damage the clear tubing. 3–18 www.zoll.com 9650-000278-01 Rev. B...
  • Page 45 “long side”, found on the top of the baffle is on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test to confirm proper aspirator operation. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–19...
  • Page 46: Vacuum Pump Replacement

    Remove the battery compartment cover by unscrewing the four 6-32 x 5/16 screws. Save these screws. Remove the battery by unscrewing the four 6-32 x 2 1/4 screws and detaching the plug from its locking latch. Save these screws. 3–20 www.zoll.com 9650-000278-01 Rev. B...
  • Page 47 Lay the chassis down so that you can access the bottom of the chassis. Remove the screws that secure the pump assembly to the chassis Save these screws. Stand the chassis on its bottom, then remove the vacuum pump from the chassis. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–21...
  • Page 48 Reconnect the wires connecting the SAM board to the 2-way valve (observe proper polarity). Position the SAM board on the aspirator module making sure to mate the J1 PIM connector to the J1 SAM connector. 3–22 www.zoll.com 9650-000278-01 Rev. B...
  • Page 49 “long side”, found on the top of the baffle is on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test to confirm proper aspirator operation. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–23...
  • Page 50: Uim Adapter Board Replacement

    Save this screw. Flip the aspirator over and remove the front case assembly by lifting it straight up away from the module. Place the front case assembly so that the inside of the case is facing up. 3–24 www.zoll.com 9650-000278-01 Rev. B...
  • Page 51 10-32 Keps nuts and the four 6-32 x 2” screws. Torque: 6-32 x 2” screws to 9 in lbs, 10-32 Keps Nuts to 18 in lbs Bit Size: #2 Phillips for screws. 3/8 in nut driver 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–25...
  • Page 52 “long side”, found on the top of the baffle is on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test to confirm proper aspirator operation. 3–26 www.zoll.com 9650-000278-01 Rev. B...
  • Page 53: Uim Stack Assembly Replacement

    Flip the aspirator over and remove the front case assembly by lifting it straight up away from the module. Place the front case assembly so that the inside of the case is facing up. Disconnect USB Cable from UIM Stack Assembly. 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 3–27...
  • Page 54 “long side”, found on the top of the baffle, on the left, and the “short side” is on the right, then place the baffle on the Exhaust Muffler Block. Perform calibration and functional test manually or using the TCE. 3–28 www.zoll.com 9650-000278-01 Rev. B...
  • Page 55: Replacement Parts

    Chapter 4 Replacement Parts Overview This chapter contains a listing of the replacement parts available for the ZOLL 330 Multifunction Aspirator. Replacement parts may be ordered through an authorized ZOLL distributor or directly from ZOLL Medical Corporation. The prices for parts are available from ZOLL Medical Corporation’s Technical Service Department.
  • Page 56: Available Replacement Parts

    Record its item number (the number in circle with pointer to the part). Find the item number in the table that follows the pictures to obtain its part number and description. For example, number “1” in the picture below points to the aspirator back case assembly. www.zoll.com 9650-000278-01 Rev. B...
  • Page 57 Replacement Parts 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 58 Replacement Parts www.zoll.com 9650-000278-01 Rev. B...
  • Page 59 Replacement Parts 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 61 Replacement Parts 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 62 Replacement Parts www.zoll.com 9650-000278-01 Rev. B...
  • Page 63 Replacement Parts 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual...
  • Page 64 Replacement Parts 4-10 www.zoll.com 9650-000278-01 Rev. B...
  • Page 65 Replacement Parts 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 4-11...
  • Page 66 Replacement Parts 4-12 www.zoll.com 9650-000278-01 Rev. B...
  • Page 67 Replacement Parts 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 4-13...
  • Page 68 Replacement Parts 4-14 www.zoll.com 9650-000278-01 Rev. B...
  • Page 69: Replacement Part List

    SCREW, PHILLIPS, PAN HEAD, 6-32 x 2 1/4, RoHS BUMPER, RUBBER, FOOT, P/S, ROUND, 450-0008-00 1/2" DIA x 1/8" THK, BLACK 416-0EMV-11 COVER,BOTTOM,BATTERY CASE,TAN SCREW, PHILLIPS, PAN HEAD, 6-32 x 5/16, STAINLESS STEEL, 358-0632-05 ZINC PLATED 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 4-15...
  • Page 70 Replacement Parts Item Number (called out in ZOLL Part Number Part Description picture) ASSEMBLY,BATTERY PACK,6.6 AH,14.8V 1887-000010-95-01 LITHIUM-ION,12- CELL CONDITIONED 9355-009041 DUAL HEAD VACUUM PUMP,M330 ASPIRATOR 1889-000004-01 ASSEMBLY, MANIFOLD, M330 ASPIRATOR HOSE BARB, NYLON, BLACK, 480-0144-00 3/16" I.D. TUBE X 1/4-28 THD (MALE) 480-0226-00 HOSE BARB, 1/8"NPTM to 3/8"...
  • Page 71 TUBING,SILICONE,WHITE, 5/16" x 9/16" x 2.6" 0163-000650 SCREW, #4-40 X 3/4"LG, PNH, PHL, SST 9500-001908 TUBING,TYGON,CLEAR,1/16" x 1/8" x 4.5" 9301-000807-01 ASSY, PCB, SAM, ASPIRATOR 334-0110-00 CLAMP, PLASTIC SLEEVE, 1/8" OD TUBING, NATURAL COLOR 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual 4-17...
  • Page 72 Replacement Parts Item Number (called out in ZOLL Part Number Part Description picture) 346-0632-01 NUT, KEPS, 6-32, STEEL, ZINC PLATED, RoHS SCREW, PHILLIPS, PAN HEAD, 4-40 X 1/4,STEEL, ZINC 358-0440-04 PLATED, RoHS 305-0002-00 TIE WRAP, 5 1/2" LONG 1889-330030-01 ASSY,SAM,SEQ030,SUBVENT...
  • Page 73: Chapter 5 Functional Description

    Tubing connects the Vacuum Port to the collection canister. The canister also provides overflow protection in the event the user attempts to aspirate more fluid than the collection canister can hold. ZOLL 330 Multifunction Aspirator Service Manual 9650-000278-01 Rev. B...
  • Page 74 Functional Description Figure 5-1 Pneumatic Design Diagram www.zoll.com 9650-000278-01 Rev. B...
  • Page 75: Appendix A Maintenance Test Checklist

    Appendix A Maintenance Test Checklist Overview Use the checklist on the following pages to record the results of the maintenance tests, and keep it for your records. ZOLL 330 Multifunction Aspirator Service Manual 9650-000278-01 Rev. B...
  • Page 76: Zoll 330 Multifunction Aspirator Maintenance Checklist

    Maintenance Test Checklist ZOLL 330 Multifunction Aspirator Maintenance Checklist Device (Aspirator) Information (Turn ON the aspirator, press the button, rotate to Unit Info, and then press the button.) Menu Dial Confirm Device SN: Device Model ASP SW Rev: SAM SW Rev:...
  • Page 77 _____________________________________________________________________________________ _____________________________________________________________________________________  Pass  Fail The ZOLL 330 Multifunction Aspirator passes the Cosmetic/Hardware Check. Performance Test, and Bleed Valve Functional Tests. The Checklist was reviewed to ensure the tests and their results are compliant to the defined standards. Name (Print):...
  • Page 79: Appendix B Specifications

    Maximum FREE AIRFLOW: Up to 35 LPM* *Maximum FREE AIRFLOW rate achieved with the use of Smart Flow. Collection Canister Capacity 1200 cc Collection Cannister Material Polystyrene and durable polyethylene LED Status/Alarm Indicator Red, Yellow, and Green ZOLL 330 Multifunction Aspirator Service Manual 9650-000278-01 Rev. B...
  • Page 80 DC Supply: Nominal 12.5 to 28.0 VDC (accepts DC voltages between 11.8 to 30 VDC). Caution Use only the DC power supply cable that ZOLL provides with the device. Operating Time Internal Battery 3 hours using settings defined in ISO 10079-1:2015 for battery operation testing.
  • Page 81: Device Classification

    Specifications Device Classification The following table describes the ZOLL Aspirator’s device classification: Category Classification Type of Protection against Electric Shock The medical power supply (which contains the system’s safety barrier) is labeled as Class I or Class II. Electrical shock protection is not dependent upon earthing since this power supply design includes double insulation.
  • Page 82: Emissions And Immunity Compliance

    Emissions Test Compliance Electromagnetic Environment Guidance The ZOLL aspirators are intended for use in the electromagnetic environment specified below. The customer or user of the aspirator should ensure that they are used in such an environment. RF emissions Group 1...
  • Page 83: Basic Safety And Essential Performance

    1.5 km from) AM, FM, or TV broadcast antennas. Electrical The Model 330 Aspirator uses an external medical power supply (Jasper AC/DC power supply REF: 9141-000-127) which meets safety standards UL60601-1 / EN60601-1 for both Class I and II. This means the power supply employs both double insulation and a protective earth ground as means of patient and operator protection, as explained below.
  • Page 85 Back Cover Replacement 3-7 Battery Compartment Cover Replacement 3-5 Battery Compartment Replacement 3-3 Battery Replacement 3-6 Exhaust Muffler Block and Baffle Replacement 3-11 Exhaust Muffler Foam Replacement 3-13 Overview 3-1 9650-000278-01 Rev. B ZOLL 330 Multifunction Aspirator Service Manual Index-1...
  • Page 86 Symbols on the Aspirator’s Graphical User Interface (GUI) 1-4 Technical Service 1-8 Troubleshooting 2-1 – 2-5 About Service Codes 2-1 Overview 2-1 Service Code List 2-2 – 2-5 Warnings General Warnings 1-7 Power Use Warnings 1-7 Service Technician Safety Warnings 1-7 Index-2 www.zoll.com 9650-000278-01 Rev. B...

Table of Contents

Save PDF