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POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

CHARGER

UC 24YC

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. F840

Jun. 2000

U

MODEL

UC 24YC

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Summary of Contents for UC 24YC

Page 1: ...POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL CHARGER UC 24YC SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No F840 Jun 2000 U MODEL UC 24YC ...

Page 2: ...tion 8 GENERAL PRECAUTIONS 13 8 1 Model UC 24YC 13 8 2 Wiring Diagram 14 8 3 Pilot Lamp Indications 14 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 15 9 1 Disassembly 15 9 2 Reassembly 15 9 3 Confirmation after Reassembly 15 10 TROUBLESHOOTING GUIDE 16 10 1 Troubleshooting Based on Pilot Lamp Indications 16 10 2 Troubleshooting and Repair Procedures 16 11 STANDARD REPAIR TIME UNIT SCHEDULES 20 Appe...

Page 3: ...arket purposes Plans to bundle it with electric power tools will be put on hold for the time being because the Model UC 24YC is more costly than the Model UC 24YF 3 APPLICATIONS Recharging of Hitachi batteries Applicable batteries Ni Cd batteries EB 7 7 2 V 1 3 Ah EB 9 9 6 V 1 3 Ah EB 12 12 V 1 3 Ah EB 7S 7 2 V 1 3 Ah EB 9S 9 6 V 1 3 Ah EB 12S 12 V 1 3 Ah EB 14S 14 4 V 1 3 Ah EB 7G 7 2 V 1 7 Ah EB...

Page 4: ...tery ambient temperature range between 10 C and 30 C Ni Cd about 1 000 times Ni MH about 500 times EB 7 EB 7S EB 9 EB 9S EB 9B EB 9M EB 924 EB 9H EB 930H EB 12 EB 12S EB 12B EB 12M EB 1224 EB 12H EB 1230H EB 14S EB 14B EB 1424 EB 14H EB 1430H EB 18B EB 24B EB 2430H Easy to read visual display of charging status through constant lighting or flashing of red and green pilot lamps 3 way overcharging p...

Page 5: ...ated up to 55 C Note 1 Wiring diagrams for batteries are shown below The 95 C thermal protector in the batteries EB 14S EB 14B EB 1424 EB 14H EB 1430H EB 18B EB 24B and EB 2430H interrupts the recharging circuit when the battery temperature reaches 95 C A discriminating resistor is provided in Ni MH batteries EB 9H EB 930H EB 12H EB 1230H EB 14H EB 1430H and EB 2430H to distinguish them from Ni Cd...

Page 6: ...inal S Terminal positions Terminal positions Terminal positions Fig 4 Ni Cd batteries EB 14S EB 14B EB 1424 EB 18B and EB 24B Terminal positions Terminal positions Fig 5 Ni MH batteries EB 9H EB 12H EB 930H and EB 1230H Terminal T Fig 6 Ni MH batteries EB 14H EB 1430H EB 2430H Terminal Terminal S Terminal 55 C Thermistor Discriminating resistor Terminal Terminal Terminal S Terminal Terminal T 95 C...

Page 7: ...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 30 60 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 th...

Page 8: ...o high Pilot lamp indications Battery Type Battery temperature range during charging Charging of heated high temperature batteries Heated high temperature battery Green pilot lamp lights When battery temperature is reduced to 40 C green pilot lamp goes OFF and charging begins EB 7 EB 9 EB 12 5 C 40 C EB 7S EB 7G EB 9S EB 9G EB 9B EB 9M EB 924 EB 12S EB 12G EB 12B EB 12M EB 1224 EB 14S EB 14B EB 14...

Page 9: ...ts Power input 4 A 6 A Approx 60 minutes for Ni MH 3 0 Ah 24 V 1 Chargeable Ni Cd battery temperature range 2 Chargeable Ni MH battery temperature range 3 Presumption HITACHI UC 24YC Charging time Overcharge protection system Charging voltage min 60 EB 2430H B 22 2 5 Ah 24 V Ni Cd UC 24YF 90 EB 2430H V 7 2 24 7 2 24 7 2 24 Charging current A 4 6 2 1 2 10 Power input W 130 70 270 Operating ambient ...

Page 10: ... If charging is attempted when the ambient temperature is above 40 C charging is not possible for the EB 7 EB 9 and EB 12 batteries because the thermostat is immediately activated to stop charging 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 h...

Page 11: ...ing on the load duration of use and ambient temperature 6 2 2 Inserting a battery into a charger in reverse direction can cause serious damage to the battery and the charger Inadvertently inserting a battery into the charger in the reverse direction will not only make it impossible to charge the battery it can also cause such damage as deformed terminals on the charger and the battery Customers sh...

Page 12: ...s automatically suspended Charging method Method A UC 12Y UC 12YA Method B UC 24YC UC 24YF UC 14YF2 UC 14YF UC 12YF UC 12YD UC 12YB dT dt Charging method Method C 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 Sudden temperature ris...

Page 13: ...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 14: ...60 C 60 C Charging impossible 45 C Charging impossible UC 14YF 40 C 60 C 60 C Charging impossible Charging impossible Charging impossible UC 12YF 40 C 60 C Charging impossible Charging impossible Charging impossible Charging impossible UC 12YD 40 C 60 C Charging impossible Charging impossible Charging impossible Charging impossible UC 12YB 40 C 60 C Charging impossible Charging impossible Charging...

Page 15: ... PCB 2 The charging terminals high frequency power transformer microcomputer controller ICs etc are mounted on the upper surface of the PCB 3 As the PCB is permanently fixed to case B by a urethane resin to ensure waterproofing it is not possible to remove the PCB alone Case B Printed circuit board Printed circuit board Case A Fig 8 ...

Page 16: ... EB 24B 5 C 60 C Green pilot lamp lights When battery temperature is reduced to 60 C green pilot lamp goes OFF and charging begins EB 9H EB 930H EB 12H EB 1230H EB 14H EB 1430H EB 2430H 0 C 45 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 Durin...

Page 17: ...ation 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 plug blade of cord and the charging terminal blade b Between the plug blade of cord and the Name Plate or fastening screws on the case Based on the voltage listed on ...

Page 18: ...d in reverse direction 2 Faulty battery short circuit or open circuit 3 Faulty case B 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 YES Pilot lamp fails to light or flash Apply rated voltage Is rated voltage applied to the plug Is there continuity between the blades of the AC cord p...

Page 19: ... connection terminals of the charger or the battery dirty deformed or otherwise abnormal Faulty internal circuits Replace case B PCB Remove dirt or correct abnormality Replace the battery S G B M and H type batteries Is the resistance between S and terminals 2 KΩ to 100 KΩ EB 7 EB 9 and EB 12 batteries Is there continuity between T and terminals ...

Page 20: ...Faulty internal circuits Replace case B 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 the S G B and M types batteries charging cannot be accomplished if battery temperature is above 60 C For H type battery charging cannot...

Page 21: ... correct direction YES Remove foreign matter Is the battery connected in reverse direction 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 case B PCB Faulty internal circuit ...

Page 22: ... 20 11 STANDARD REPAIR TIME UNIT SCHEDULES MODEL 10 20 30 40 Fixed Variable UC 24YC Work Flow Case A Fuse 3 15 A Prism 60 min 50 Case B Cord Varistor General Assembly Terminal A Terminal B ...

Page 23: ... 21 Assembly Diagram for UC 24YC ...

Page 24: ...ACHI LABEL 1 2 315 150 CASE A 1 3 991 167 CORD ARMOR 1 4 307 658 FUSE 3 15A 1 5 305 087 VARISTOR 1 6 319 086 CASE B ASS Y 1 INCLUD 4 5 8 11 12 7 300 036 TAPPING SCREW W FLANGE D3X20 4 8 NAME PLATE 1 9 315 151 PRISM 1 10 307 216 CORD 1 FOR GBR 10 980 642Z CORD 1 FOR NOR 11 306 880 TERMINAL A 1 12 306 881 TERMINAL B 1 ...

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