Sharp FU-28H-S Service Manual
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Sharp FU-28H-S Service Manual

Sharp FU-28H-S Service Manual

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SAFETY PRECAUTIONS .................................................................................................................................. 2
HOW SHARP AIR PURIFIER WORKS ............................................................................................................. 4
SPECIFICATIONS FOR THIS PRODUCT ........................................................................................................ 5
NAMES OF PARTS .......................................................................................................................................... 7
INSTLLATION ................................................................................................................................................... 8
ABOUT THE FUNCTION ................................................................................................................................ 14
ELECTRIC CIRCUIT ........................................................................................................................................ 15
TROUBLESHOOTING GUIDE ........................................................................................................................ 22
REPLACEMENT OF MAIN PARTS ................................................................................................................. 24
OPERATION .................................................................................................................................................... 29
MAINTENANCE ............................................................................................................................................... 30
CUMULATIVE TIME CHECK FUNCTION (MAINTENANCE MODE) ............................................................. 32
USE RESIN TABLE ......................................................................................................................................... 33
REPLACEMENT PARTS LIST ........................................................................................................................ 34
SERVICE MANUAL
FU-28H-S
MODEL
In the interests of user-safety (Required by safety regulations
in some countries) the set should be restored to its original
condition and only parts identical to those specified should be
used.

TABLE OF CONTENTS

SHARP CORPORATION
1
AIR PURIFIER
FU-28H-S
S4616FU28HS//
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Summary of Contents for Sharp FU-28H-S

  • Page 1: Table Of Contents

    TABLE OF CONTENTS Page SAFETY PRECAUTIONS ..........................2 HOW SHARP AIR PURIFIER WORKS ......................4 SPECIFICATIONS FOR THIS PRODUCT ......................5 NAMES OF PARTS ............................7 INSTLLATION ..............................8 ABOUT THE FUNCTION ..........................14 ELECTRIC CIRCUIT ............................

  • Page 2: Safety Precautions

    Electrical shock from bad insulation and / or fire from short circuit may occur as a result. • If the power cord is damaged, it must be replaced by the manufacturer, its service agent, Sharp authorized service or similarly qualified person in order to avoid a hazard.

  • Page 3: Remote Control Limitations

    FU-28H-S REMOTE CONTROL LIMITATIONS DO NOT USE THE REMOTE CONTROL IN THE FOLLOWING LOCATIONS: • Any location where there is inverter lighting equipment or electronic spontaneous lighting equipment The remote control may become inoperative. In this case, move away from such lighting equipment or change direction.

  • Page 4: How Sharp Air Purifier Works

    FU-28H-S HOW SHARP AIR PURIFIER WORKS An air purifier draws in room air from its air intake, lets the air pass through an Active Carbon Filter (Deodorizing Filter) and a HEPA Filter (dust collection filter) inside of the unit, then discharges the air from its air outlet.

  • Page 5: Specifications For This Product

    FU-28H-S SPECIFICATIONS FOR THIS PRODUCT 1.Specifications Type FU-28H-S Power supply 220 - 240V 50/60Hz Fan level adjustment Silent Rated power (W) Fan level (m /hour) 1000 ± 10 330 ± 10 Fan rotation speed (r.p.m.) Noise (dB) Applicable floor area...
  • Page 6 FU-28H-S 2.External dimentions 1) Simple substance figure 139.5 [Length unit : mm] 2) Wall tapestry figure Wall Wall Wall 141.5 Wall Wall Wall [Length unit : mm]...

  • Page 7: Names Of Parts

    FU-28H-S NAMES OF PARTS MAIN UNIT DISPLAY Plasmacluster Indicator Light Power ON/OFF button Fan Speed Indicator Lights Fan Control button OFF Timer Display Indicator Lights OFF Timer button Remote Control Receiver Odour Sensor Filter Frame HEPA Filter (white) (with Microbial Control Filter)(blue)

  • Page 8: Instllation

    FU-28H-S INSTALLATION FOR APPROPRIATE INSTALLATION To remove room odour Installing the unit high up on the wall is most effective. To remove room dust Comparatively large dust particles such as pollen and house dust collect in the lower strata of the room air.
  • Page 9 FU-28H-S Mount wall mounting bracket • Mount the bracket using the included wood screws so that it is maintained level. Installation on a concrete, block or mortar surface Drill holes of at least 35 mm depth and 5 mm diameter into the wall, drive in Fisher plugs, and fix the unit with wood screws.
  • Page 10 FU-28H-S Before starting the wall installation, be sure to remove the front panel and filter frame. Filter Frame Front Panel Install the unit on the wall. Place the unit facing up, remove the Front Air Outlet Panel and Filter Frame.

  • Page 11: How To Remove The Unit

    FU-28H-S Apply a mark (tape, etc.) 8 cm above both ends of the wall mounting bracket. Lift up the unit so that the hooking holes on the unit are aligned with the marks, hook the unit onto the wall mounting bracket and slide it to the right.

  • Page 12: Filter Installation

    FU-28H-S Be sure to remove the filters from the FILTER INSTALLATION plastic bags before using the unit. How to Remove the Stainless Remove the Pre-Filter, Steel Pre-Filter Active Carbon Filter and HEPA Filter from the Filter Frame. Tabs Pre-Filter Active Carbon Filter...
  • Page 13 FU-28H-S Mount the Filter Frame to the main unit. Filter Frame Fill in the usage start date on the Date Label. Use the date as a guide for the Filter Replacement schedule. Date Label Claw Claw socket Mount the Front Panel to the main unit.

  • Page 14: About The Function

    FU-28H-S ABOUT THE FUNCTION AUTO OPERATION The air purifier will automatically adjust its speed according to the air quality detected by the odour sensors in order to clean effectively. SILENT OPERATION The air purifier will operate quietly, producing only a slight current of air (the lowest fan speed).

  • Page 15: Electric Circuit

    FU-28H-S ELECTRIC CIRCUIT 1. ABOUT LEAD-FREE SOLDER 1) Employing lead-free solder The "Main PWB" of this model employs lead-free solder. This is indicated by the "LF" symbol printed on the PWB and in the service manual. The suffix letter indicates the alloy type of the solder.
  • Page 16 FU-28H-S 3. PRINTED WIRING BOARD...
  • Page 17 FU-28H-S 4. OPERATIONS (1) Block diagram Power supply Noise preventon Power supply clock circuit clock generation circuit circuit circuit Fan motor LED drive Reset circuit drive circuit circuit Plasmacluster Key input LSI-1 (Microcomputer) unit drive circuit circuit Remote control Odour sensor...
  • Page 18 FU-28H-S 7) LED drive circuit Repetitive signal of " H " and " L " output from the pins 18 - 20 of the microcomputer LSI-1 turns on and off the digital transistors Q110 - Q112. They are turned on one by one at intervals of certain time. When " L " is output from the pins 15 - 17 of the microcomputer LSI-1 as they are turned on, the corresponding LED that are connected to them light up.
  • Page 19 FU-28H-S 12) Plasmacluster unit drive circuit The plasmacluster unit is the power supply unit that supplies the high voltage to generate ion from the cluster electrode, and it can be activated by inputting AC220-240V into it. When the solid state relay SSR1 is turned on, the voltage for commercial power supply drops in the resistor R124 and approximately AC90-110V is applied to the plasmacluster unit.
  • Page 20 FU-28H-S 6. ERROR MODES (1) Outline Error modes serve as self-diagnostic tools, using a range of sensors to detect errors and failures in the purifier and its circuitry and indicating the nature of those errors through load operation and error displays.
  • Page 21 FU-28H-S 6.CONTROL CIRCUITDIAGRAM...

  • Page 22: Troubleshooting Guide

    FU-28H-S TROUBLESHOOTING GUIDE Always use the designated parts when replacing parts. Service of the PWB ass'y The electrical circuit is composed of the Control PWB ass'y, Power supply PWB ass'y, Display PWB Ass'y and the Switch PWB ass'y. Problem Cause and symptoms Solution The purifier will not operate.
  • Page 23 FU-28H-S This symptom Does not indicate a problem with the air purifier. The purifier is making clicking This sound is produced when plasmacluster ions are being noise. generated. Sometimes a clicking sound is While this sound may grow louder or softer and may even...

  • Page 24: Replacement Of Main Parts

    FU-28H-S REPLACEMENT OF MAIN PARTS Be sure to return all screws to their original positions and tighten appropriately when reassembling the air purifier after repair. Different screws are used for different purposes based on characteristics such as head type, diameter, and length.
  • Page 25 FU-28H-S (2) Disconnect the Display PWB and Operation PWB (3) Remove the 2 screws (3 x 12 mm binding head harnesses from the Control PWB. screws) holding the Display PWB. Display PWB harness Display PWB harness Display PWB harness symbol:...
  • Page 26 FU-28H-S (2) Remove the Nut and then remove the Spring (3) Remove the Discharge Guard from the Discharge Washer, Fan, and Sitting Washer. Vent. Discharge Discharge Guard Discharge Guard uard Discharge Discharge Vent Discharge Vent Spring Spring Sasher Spring Sasher...
  • Page 27 FU-28H-S 7. HOW TO REMOVE THE CONTROL PWB (5) Remove the Control PWB. Control PWB Box Top Control PWB Box Top Control PWB Box Top (1) Remove the Power Supply PWB harness from the Control PWB. Power Power Supply PWB harness...
  • Page 28 FU-28H-S 9. HOW TO REMOVE THE MOTOR ASSEMBLY PRECAUTIONS * When installing the Motor, set the Motor so that the (1) Remove the Motor harness Cover in the direction circled flange holes line up with the positions on the shown by the arrows, and then remove the Motor Back Panel shown by the arrows.

  • Page 29: Operation

    FU-28H-S OPERATION For the first 30 seconds after the plug is inserted into the wall outlet, the unit will check the conditions of the air. • Auto Operation Odour sensor checks the amount of impurities in the air and the fan speed switches automatically.

  • Page 30: Maintenance

    FU-28H-S MAINTENANCE 1 CLEANING THE PRE-FILTER » Use a vacuum to clean off the pre-filter. When especially dirty, wash the pre-filter with water. When washing with water, use cold or lukewarm water (40ºC or less) and a soft brush. Metal brushes or scrub brushes may cause damage.
  • Page 31 FU-28H-S 4 CLEANING THE PLASMACLUSTER UNIT ELECTRODES » Soak a cotton swab with cleaning alcohol and use it to wipe off the electrodes. Do not directly touch the electrodes with your fingers while doing this. Also make sure no foreign matter gets into the circled areas.

  • Page 32: Cumulative Time Check Function (Maintenance Mode)

    FU-28H-S CUMULATIVE TIME CHECK FUNCTION (MAINTENANCE MODE) This product (FU-28H) allows you to check the cumulative operation time. This can be used as a guideline for conducting maintenance. MAINTENANCE MODE SETTING METHOD (1) Plug in the power plug and make sure operation has stopped.

  • Page 33: Use Resin Table

    FU-28H-S USE RESIN TABLE REF. NO. Parts Code Parts Name Material Name JBTN-A010KKMA CONTROL BUTTON Acrylonitrile Butadiene Styrene HB-ABS PCOV-A072KKFZ CONTROL SWITCH BOX Polystyrene V0-HI-PS GCAB-A042KKRA FRONT FRAME V0-PC-ABS Polycarbonate/Acrylonitrile Butadiene Styrene PBOX-A013KKFA FILTER CASE V0-PC-ABS Polycarbonate/Acrylonitrile Butadiene Styrene GGAD-A002KKFZ INTAKE GARD...

  • Page 34: Replacement Parts List

    FU-28H-S REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION Q'TY CODE ELECTRIC PARTS 1- 1 CRMC-A064KKEZ Remote controller 1- 2 CACCJA031KKEZ Ac cord 1- 3 CKITTA020AKKZ Plasmacluster unit 1- 4 CMOT-A021KKEZ Motor 1- 5 CPWB-A056KKKZ 28H pwb ass’y 1- 7...
  • Page 35 FU-28H-S REF. NO. PART NO. DESCRIPTION Q'TY CODE 90- 7 SPAKCJ521YDEZ Packing case 90- 8 SSAKHA402YDEZ Body plastic bag 90- 9 SSAKAA043KKEZ Holder bag 90- 12 TCAUZA010KKRZ Caution label 90- 13 TLAB-A120KKRZ Filter label 90- 14 TSPCNA143KKRZ Name plate 90- 17...
  • Page 36 FU-28H-S 2-19 2-21 2-38 2-23 2-20 2-28 2-22 2-37 2-25 2-26 2-27 Attached parts 2-29 2-37 2-30 2-40 2-33 2-32 2-36 2-35 2-34 2-10 2-33 2-36 2-16 2-11 2-15 2-18 2-41 2-17 2-13 2-14 2-31 2-12 FU-28H '2004.7. SHARP CORP.

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