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Hitachi uc 24yfb Technical Data And Service Manual

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MODEL
UC 24YFB
POWER TOOLS
TECHNICAL DATA
CHARGER
AND
UC 24YFB
SERVICE MANUAL
U
LIST No. F846
Mar. 2001
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  Summary of Contents for Hitachi uc 24yfb

  • Page 1 MODEL UC 24YFB POWER TOOLS TECHNICAL DATA CHARGER UC 24YFB SERVICE MANUAL LIST No. F846 Mar. 2001 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 Notice for use Specifications and parts are subject to change for improvement. Refer to Hitachi Power Tool Technical News for further information.
  • Page 3: Table Of Contents

    6. PRECAUTIONS IN SALES PROMOTION ..................8 6-1. Safety Instructions .......................... 8 6-2. Extra Precautions in Sales Promotion .................... 9 7. QUESTIONS AND ANSWERS ON MODEL UC 24YFB .............. 10 8. GENERAL PRECAUTIONS ......................12 8-1. Model UC 24YFB .......................... 12 8-2.
  • Page 4: Product Name

    Improved stability in mounting battery packs to cordless tools and improved stability in electric contact The Model UC 24YFB Charger that has been developed to meet these needs is capable of recharging either a 24 V slide-in nickel cadmium (Ni-Cd) battery or a 24 V slide-in nickel metal hydride (Ni-MH) battery in about one hour.
  • Page 5: Selling Points

    4. SELLING POINTS (1) Accepts both Ni-MH and Ni-Cd batteries (2) Rapidly charges Hitachi EB 2420 and 2430 HA batteries Charging time: 24 V, 2.0 Ah 50 minutes • • • • • • • • • 24 V, 3.0 Ah 70 minutes •...
  • Page 6: Selling Point Descriptions

    4-1. Selling Point Descriptions 4-1-1. Capable of handling both nickel cadmium (Ni-Cd) and nickel metal hydride (Ni-MH) batteries Through application of HITACHI-microcomputer and electronic-circuit control technology, Model UC 24YFB is capable of handling both Ni-Cd and Ni-MH batteries. 4-1-2. Rapidly charges Hitachi EB 2420 and 2430 HA batteries Table 1 Recharging time (approx.
  • Page 7 95 ˚C Thermal protector Terminal position 60 ˚C Thermistor Terminal Terminal Terminal Terminal Fig. 2 Ni-Cd battery (EB 2420) 95 ˚C Thermal protector Discriminating Terminal position resistor Terminal 55 ˚C Thermistor Terminal Terminal Terminal Terminal Fig. 3 Ni-MH battery (EB 2430HA)
  • Page 8 4-1-5. 3-way overcharge protection system Overcharge protection is ensured by a (A) system or dT/dt system (for Ni-MH battery), (B) built-in battery temperature sensors (thermostat and thermistor) and (C) a timer. Overcharge range Battery voltage 55˚C Thermistor dT/dt 60˚C Thermistor 40˚C Thermostat Ni-MH Battery temperature...
  • Page 9 4-1-6. Easy-to-read visual display of charging status through constant lighting or flashing of red and green pilot lamps Pilot lamp indications 0.5 sec. ON 0.5 sec. OFF Blinks Prior to charging Stays ON constantly Red pilot lamp During charging Lights remains lit or flashes 0.5 sec.
  • Page 10: Specifications

    Approx. 50 minutes (for Ni-Cd 2.0 Ah, 24 V) Product weight 0.6 kg Operating ambient 0 ˚C --- 40 ˚C temperature range 5-2. Comparisons with Similar Products HITACHI UC 24YFB Charging time min. (2.0 Ah, 24 V Ni-Cd) (EB 2420) Charging voltage Charging current 120 V, 2.2 A Power input 120 V, 1.5 A...
  • Page 11: Precautions In Sales Promotion

    6-1. Safety Instructions In the interest of promoting the safest and most efficient use of the Model UC 24YFB Charger by all of our customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions.
  • Page 12: Extra Precautions In Sales Promotion

    6-2. Extra Precautions in Sales Promotion The following points must be given during sales promotion. 6-2-1. Charging may not be possible when the battery temperature is high Charging may not be possible if the temperature of the battery is high after it has been exposed to direct sunlight for a long time or immediately after it has been used.
  • Page 13: Questions And Answers On Model Uc 24Yfb

    7. QUESTIONS AND ANSWERS ON MODEL UC 24YFB Q1 What are typical charging methods? A1 The most recent electronic charging methods are outlined below. Method A Method B UC 12Y UC 24YFA UC 12YA UC 24YFB UC 24YC UC 24YF...
  • Page 14 ) to be generated in a short period of time, as shown below. This proportionately accelerates degradation of the plates. microcomputer control system was adopted for the Model UC 24YFB charger in order to stop charging immediately before the battery is fully charged, thereby avoiding the generation of oxygen gas.
  • Page 15: General Precautions

    8. GENERAL PRECAUTIONS 8-1. Model UC 24YFB (1) The outer frame consists of case (A) and case (B). Inside the frame there are the print circuit board and terminals. (2) The print circuit board consists of high-frequency power transformer, microcomputer and other electronic devices to permit rapid charging and to protect against overcharging.
  • Page 16: Pilot Lamp Indications

    8-2. Pilot Lamp Indications Pilot lamp indications 0.5 sec. ON 0.5 sec. OFF Blinks Prior to charging Stays ON constantly Red pilot lamp During charging Lights remains lit or flashes Charging 0.5 sec. ON 0.5 sec. OFF Blinks completed 0.1 sec. ON 0.1 sec.
  • Page 17: Precautions In Disassembly And Reassembly

    9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram for UC 24YFB. 9-1. Disassembly (1) Remove the four Tapping Screws (W/Flange) D3 x 20 [6] and take off Case (A) [2].
  • Page 18: Troubleshooting Guide

    10. TROUBLESHOOTING GUIDE 10-1. Troubleshooting Based on Pilot Lamp Indications Phenomenon Typical causes Check procedures Pilot lamp fails to light or flash. (1) Faulty AC cord Refer to trouble mode (A). (2) Blown fuse (3.15 A) on primary side Red pilot lamp does not stay lit (1) Poor connection of (T) or (S) terminal Refer to trouble mode (B).
  • Page 19 (2) Trouble mode (B) Red pilot lamp does not stay lit (continues to flash) after battery has been connected. Are the connection terminals Remove dirt or of the charger or the battery dirty, deformed, correct abnormality. or otherwise abnormal ? Check with tester.
  • Page 20 (3) Trouble mode (C) Pilot lamp remains green (red fails to light) after battery has been connected. Is ambient temperature Conduct charging within within designated range (between designated temperature range. 0˚C and 40˚C) ? 0 ˚C 40 ˚C Is the Allow battery to cool prior to battery very charging...
  • Page 21 (4) Trouble mode (D) Pilot lamp flickers red, indicating abnormality. Is there some sort of conductive foreign Remove foreign matter. matter in the hole where the battery is inserted ? Is the battery short-circuited Replace the battery. or opened ? Faulty internal circuit Replace PCB.
  • Page 22: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow UC 24YFB General Assembly Case (A) Case (B) Fuse (3.15 A) Printed Circuit Board Ass'y Light Bar Cord...
  • Page 23: Assembly Diagram For Uc 24Yfb

    LIST NO. F846 ELECTRIC TOOL PARTS LIST CHARGER 2001 • • Model UC 24YFB (E1)
  • Page 24 PARTS UC 24YFB ITEM CODE NO. DESCRIPTION REMARKS USED HITACHI LABEL 319-935 CASE (A) 319-781 FUSE (125V-3.15A) FOR 120V 319-780 FUSE (250V-3.15A) FOR 230V-240V 319-937 PRINTED CIRCUIT BOARD ASS’Y 120V INCLUD.3 319-938 PRINTED CIRCUIT BOARD ASS’Y 230V-240V INCLUD.3 319-936 CASE (B)