Hitachi UC 24YFB Technical Data And Service Manual Download Page 15 | Manualshive

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Case (A)

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.

Case (B)

Printed circuit board

Terminal

Case (A)

Case (B)

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Summary of Contents for UC 24YFB

Page 1: ...POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL CHARGER UC 24YFB SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No F846 Mar 2001 U MODEL UC 24YFB ...

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: ...ecautions 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 Pilot Lamp Indications 13 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 14 9 1 Disassembly 14 9 2 Reassembly 14 9 3 Confirmation after Reassembly 14 10 TROUBLESHOOTING GUIDE 15 10 1 Troubleshooting Based on Pilot Lamp Indications 15 10 2 Troubleshooting and Repair Procedures...

Page 4: ...ng Improved operability and appearance designed free from the handle shape constraints 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 ab...

Page 5: ... charge control mechanism for longer battery life EB 2420 EB 2430HA Easy to read visual display of charging status through constant lighting or flashing of red and green pilot lamps 3 way overcharging protection systems for longer battery and charger life Fig 1 Recharging discharging cycles of battery ambient temperature range between 10 C and 30 C Ni Cd about 1 000 times Ni MH about 500 times ...

Page 6: ...imes Ni MH battery about 500 times 4 1 4 Capable of recharging batteries with internal temperatures as high as 60 C When a battery with S terminal is used as shown in Fig 2 the 60 C thermistor operates to permit recharging of batteries heated up to 60 C and as shown in Fig 3 the 55 C thermistor operates heated up to 55 C Note 1 Wiring diagrams for batteries are shown below The 95 C thermal protect...

Page 7: ...Terminal Terminal Terminal Terminal S Fig 2 Ni Cd battery EB 2420 Terminal position Fig 3 Ni MH battery EB 2430HA Terminal Terminal Terminal S Terminal Terminal T 95 C Thermal protector 55 C Thermistor Discriminating resistor Terminal position ...

Page 8: ...or the 60 C thermistor stops charging when battery temperatures reach their respective values C Timer Should both the system dT dt system and the temperature sensors fail the timer automatically stops charging within 120 minutes from the beginning of charging Note 2 The voltage of the battery increases during charging and begins to fall when further charging is not possible The system detects the ...

Page 9: ...ec ON 0 5 sec OFF 0 1 sec ON 0 1 sec OFF Stays ON constantly Battery or charger is faulty Charging not possible because battery temperature is too high Pilot lamp indications Battery Type Battery temperature range during charging Charging of heated high temperature batteries Heated high temperature battery EB 2420 5 C 60 C Green pilot lamp lights When battery temperature is reduced to 60 C green p...

Page 10: ...ambient temperature range 5 2 Comparisons with Similar Products Power input 2 5 A Approx 50 minutes for Ni Cd 2 0 Ah 24 V 1 Chargeable Ni Cd battery temperature range 2 Chargeable Ni MH battery temperature range HITACHI UC 24YFB Charging time Overcharge protection system Charging voltage min 50 EB 2420 V 24 Charging current A 2 5 Power input VA 120 V 1 5 A Operating ambient temperature range C 0 4...

Page 11: ...hermistor and thermostat do not function properly thereby reducing the service life of the battery While it is possible to charge batteries with an S terminal at higher temperatures the service life of the batteries may be considerably reduced 4 Do not use the charger for successive charging In very hot locations if two or more batteries are charged successively the temperature of the charger will...

Page 12: ...ht for a long time or immediately after it has been used The customer should be advised in such a case to place the battery in a shaded area with good airflow and allow sufficient cooling before recharging This phenomenon is common to all existing batteries and chargers which employ temperature sensitive overcharge protection devices The cooling time required before recharging varies from a few mi...

Page 13: ...spended Charging method Method A UC 12Y UC 12YA Method B UC 24YFA UC 24YFB UC 24YC UC 24YF UC 14YF2 UC 14YF UC 12YF UC 12YD UC 12YB dT dt Charging method Method C UC 24YFA UC 24YFB UC 24YC Battery voltage Charging time The descending voltage of the battery in the final stage of charging is detected and charging is automatically suspended Charging method Battery temperature Charging time dT dt Sudd...

Page 14: ...em detects a sudden voltage change which occurs just before the battery is fully charged and then suspends charging The dT dt system detects a sudden temperature rise which occurs just before the battery is fully charged and then suspends charging Q4 Is there any difference in the amount of work possible per charge of batteries charged with the microcomputer control system and those charged with d...

Page 15: ...se 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 Case B Printed circuit board Terminal Case A Case B ...

Page 16: ...5 C Green pilot lamp lights When battery temperature is reduced to 45 C green pilot lamp goes OFF and charging begins Prior to charging Red pilot lamp remains lit or flashes Blinks 0 5 sec ON 0 5 sec OFF During charging Charging completed Lights Blinks Charging not possible Flickers Green pilot lamp is lit High battery temperature Lights Stays ON constantly 0 5 sec ON 0 5 sec OFF 0 1 sec ON 0 1 se...

Page 17: ...s up When charging an EB 2430H battery confirm that the red pilot lamp flashes at 1 second intervals approx 60 minutes from commencing charging 2 Measure the insulation resistance and conduct a dielectric strength test Insulation resistance 10 MΩ or more between the plug blade of cord and the Name Plate or case fastening screws with DC 500 V Megohm Tester Dielectric strength test a Between the plu...

Page 18: ...Faulty PCB 1 Poor connection of T or S terminal 2 Faulty PCB 1 Faulty battery short circuit or open circuit 2 Faulty PCB Typical causes Refer to trouble mode A Check procedures Refer to trouble mode B Refer to trouble mode C Refer to trouble mode D NO NO NO NO NO YES YES YES YES Pilot lamp fails to light or flash Apply rated voltage Is rated voltage applied to the plug Is there continuity between ...

Page 19: ...inues to flash after battery has been connected Are the connection terminals of the charger or the battery dirty deformed or otherwise abnormal Faulty internal circuits Replace PCB Remove dirt or correct abnormality Replace the battery Is the resistance between S and terminals 2KΩ to 100 KΩ ...

Page 20: ...nals 2KΩ to 100 KΩ Faulty internal circuits Replace PCB Pilot lamp remains green red fails to light after battery has been connected Allow battery to cool prior to charging NO Conduct charging within designated temperature range 0 C 40 C Clean or repair deformed terminals For EB 2420 charging cannot be accomplished if battery temperature is above 60 C For EB 2430HA charging cannot be accomplished ...

Page 21: ...d indicating abnormality YES Remove foreign matter Is there some sort of conductive foreign matter in the hole where the battery is inserted NO NO YES Replace the battery Is the battery short circuited or opened Replace PCB Faulty internal circuit ...

Page 22: ...19 11 STANDARD REPAIR TIME UNIT SCHEDULES MODEL 10 20 30 40 Fixed Variable UC 24YFB Work Flow Case A Fuse 3 15 A Light Bar 60 min 50 Case B Printed Circuit Board Ass y Cord General Assembly ...

Page 23: ...ELECTRIC TOOL PARTS LIST LIST NO CHARGER Model UC 24YFB 2001 1 30 E1 F846 ...

Page 24: ...25V 3 15A 1 FOR 120V 3 319 780 FUSE 250V 3 15A 1 FOR 230V 240V 4 319 937 PRINTED CIRCUIT BOARD ASS Y 120V 1 INCLUD 3 4 319 938 PRINTED CIRCUIT BOARD ASS Y 230V 240V 1 INCLUD 3 5 319 936 CASE B 1 6 300 036 TAPPING SCREW W FLANGE D3X20 4 7 NAME PLATE 1 8 319 934 LIGHT BAR 1 9 318 262 CORD 1 9 318 259 CORD 1 FOR USA 9 318 261 CORD 1 FOR GBR 9 318 260 CORD 1 FOR AUS ...

Page 25: ......

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