Hitachi UC 24YJ Technical Data And Service Manual Download Page 26 | Manualshive

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Case (A) [2]

8. GENERAL PRECAUTIONS

8-1. Model UC 24YJ

(1) The outer frame is composed of case (A) and case (B). A circuit board is built in.

(2) The prism is mounted to case (A).

(3) The terminal for charging, high-frequency transformer for power supply, microcomputer for control, IC, etc. are

mounted on the circuit board.

(4) The circuit board is waterproof and secured to case (B) ass'y with urethane resin. It is impossible to remove

only the circuit board.

Prism [8]

Circuit board

Case (B) Ass'y [5]

Tapping Screw (W/Flange)
D3 x 20 [6]

Fig. 18

Cord armor

Cord [3]

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Summary of Contents for UC 24YJ

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL CHARGER UC 24YJ SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No F889 Oct 2003 U MODEL UC 24YJ Hitachi Power Tools ...

Page 2: ...tions 19 6 2 Extra Precautions in Sales Promotion 20 7 QUESTIONS AND ANSWERS ON MODEL UC 24YJ 21 8 GENERAL PRECAUTIONS 24 8 1 Model UC 24YJ 24 8 2 Wiring Diagram 25 8 3 Pilot Lamp Indications 25 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 26 9 1 Disassembly 26 9 2 Reassembly 26 9 3 Confirmation after Reassembly 26 10 TROUBLESHOOTING GUIDE 27 10 1 Troubleshooting Based on Pilot Lamp Indications 27 ...

Page 3: ...4YC to meet the market demand The Model UC 24YJ can charge batteries from 7 2 V to 24 V in shorter times than the current Model UC 24YC 3 APPLICATIONS Recharging of Hitachi batteries Applicable batteries EB 9H 9 6 V 2 2 Ah EB 12H 12 V EB 1222HL EB 14H 14 4 V EB 18H 18 V EB 930H 9 6 V 3 0 Ah EB 1230H 12 V EB 1230HL EB 1430H 14 4 V EB 1830H 18 V EB 2430H 24 V EB 7S 7 2 V 1 3 Ah EB 9S 9 6 V EB 12S 12...

Page 4: ...uired for recharging a battery at a temperature of 5 C is shortened from 2 5 hours to 40 minutes Charging status indicator lamp indicates the charging status Charging time indicator lamp indicates the time up to completion of charging in 3 steps remaining charging time can be seen at a glance Equipped with the battery revitalizing trickle charging function ...

Page 5: ...s charging proceeds indication of the indicator lamp changes When the remaining charging time is about 20 minutes the charging time indicator lamp lights orange continuously When the remaining charging time is about 5 minutes the charging time indicator lamp lights green continuously When the charging time indicator lamp lights orange continuously When the charging time indicator lamp lights orang...

Page 6: ...g is completed Lamp indication Battery type Battery temperature Battery status Fig 1 Charging time indication Relationship between charging time indication and battery 4 1 3 Equipped with the battery revitalizing trickle charging function Refer to 5 3 7 Revitalizing the battery trickle charging on page 16 for details 4 1 4 Capable of charging conventional 7 2 V to 24 V batteries The Model UC 24YJ ...

Page 7: ... Ni Cd 2Ah min Ni MH 7 Ni Cd 10 16 Charging current A 7 5 9 Chargeable battery temperature range C 5 to 50 0 to 60 Peak cut T Timer External dimensions mm 110 x 226 x 75 4 11 32 x 8 29 32 x 2 31 32 160 x 202 x 79 6 19 64 x 7 31 32 x 3 7 64 140 x 192 x 68 5 17 32 x 7 9 16 x 2 11 16 Weight kg 1 0 2 2 lbs 1 0 2 2 lbs 1 0 2 2 lbs B V 41 7 2 to 14 4 Ni MH 3Ah min 25 No applicable battery Ni MH 2Ah min ...

Page 8: ...gh frequency may cause noise in a television or a radio To prevent this noise problem avoid connecting the Model UC 24YJ to the same receptacle where a television or a radio is connected In addition keep a distance between the Model UC 24YJ and the television or the radio during charging The rapid type chargers made by competitors have the same demerit due to the switching power source system Char...

Page 9: ...overcharge range Normally the charging stop position by the overcharge protection system is almost the same as that by the dT dt overcharge protection system However when the battery is inactive due to extensive non use periods or near the end of the service life the battery voltage does not change suddenly and charging may not be stopped by the overcharge protection system The Model UC 24YJ is eq...

Page 10: ...wn and then start charging In most cases of Ni MH batteries charging may stop before the battery is fully charged because the detecting temperature of the thermistor is set as low as 55 C and the temperature rise is rapid when the battery temperature is high see Fig 6 When the battery temperature is over 50 C the charge time lamp flashes red in 0 6 second intervals When the battery cools down to 5...

Page 11: ... EB 9M and EB 12M EB 14S EB 14B EB 1820 EB 18B and EB 24B Terminal for charging Applicable battery models EB 9H EB 12H EB 1222HL EB 930H EB 1230H and EB 1230HL Applicable battery models EB 14H EB 18H EB 1430H EB 1830H and EB 2430H Thermostat Models UC 12Y and UC 12YA Applicable battery models Models UC 24YJ UC 24YC UC 24YFA UC 24YF UC 12YE UC 12YD and UC 12YB Thermistor Discriminating resistor The...

Page 12: ... Charging complete Before charging Status Lit red Lit orange Flashing red Flashing orange rapidly Lit green Lit green Flashing red On 0 3 second off 0 3 second On continuously On continuously On 0 1 second off 0 1 second On 0 5 second off 0 5 second 20 minutes until charging complete Battery or charger malfunction Battery overheated Unable to charge Charging will commence when battery cools Power ...

Page 13: ...start of charging is between 5 C and 50 C Battery temperature at the start of charging is 50 C or more Battery temperature at the start of charging is 5 C or less Inside of the charger becomes hot during charging at 9 A see Fig 13 Charging current Switch from 9 A to 6 A 9 A 7 5 A 1 3 A Purpose Protection of the charger Protection of the battery The battery is also charged at 1 3 A when the battery...

Page 14: ...is switched 6 A 1 3 A according to the battery temperature at the start of charging Charging time Charging current constant value Min Charging time Battery temperature at the start of charging Charging current constant value In the case of 2 0 Ah Ni Cd battery Model EB 24B Temperature Battery temperature at the start of charging is between 5 C and 55 C Battery temperature at the start of charging ...

Page 15: ...tection of the battery The battery is also charged at 1 3 A when the battery is near the end of its service life Otherwise the battery temperature becomes high due to the high internal resistance and it is dangerous 4 7 2 V to 14 4 V Ni MH batteries The charging current is switched 9 A 6 A 4 A 1 3 A according to the battery temperature at the start of charging Therefore the charging time changes a...

Page 16: ... the battery The battery is also charged at 1 3 A when the battery is near the end of its service life Otherwise the battery temperature becomes high due to the high internal resistance and it is dangerous 5 18 V Ni MH battery The charging current is switched 7 5 A 6 A 5 A 4 A 1 3 A according to the battery temperature at the start of charging Therefore the charging time changes as shown in Fig 11...

Page 17: ...e Protection of the battery Protection of the battery The battery is also charged at 1 3 A when the battery is near the end of its service life Otherwise the battery temperature becomes high due to the high internal resistance and it is dangerous 6 24 V Ni MH battery The charging current is switched 6 A 4 A 1 3 A according to the battery temperature at the start of charging Therefore the charging ...

Page 18: ...has not been used for extensive periods 6 months as a guide may not be charged completely due to inert internal chemicals Leave the battery inserted in the charger for 8 to 12 hours after completion of charging The charger automatically revitalizes the battery by trickle recharging Fig 14 Revitalizing the battery trickle charging Completion of charging Status Charging current Charge status lamp li...

Page 19: ... and Ni MH batteries The characteristics of the Ni Cd batteries and the Ni MH batteries are described in the table below 1 2 1 2 Item Capacity Relationship between discharging capacity and temperature Self heating during charging Impact on the environment Characteristics Ni MH batteries have higher capacity than Ni Cd batteries See Fig 15 Ni MH batteries have higher self heating value than Ni Cd b...

Page 20: ...ots total of 12 means the production month Example Figure 16 shows the case when the production date is April 1998 12 8 4 April Serial number column Fig 16 Name plate Marking on the upper case of the battery The serial number is indicated with four digits the last two digits of the production year production week by marking Example Figure 17 shows the case when the production date is April 1998 th...

Page 21: ...ostat do not function properly thereby reducing the service life of the battery If charging is attempted when the ambient temperature is above 40 C it is possible to charge batteries with an S terminal 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...

Page 22: ...ding 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 s...

Page 23: ... automatically suspended 7 QUESTIONS AND ANSWERS ON MODEL UC 24YJ Q1 What are typical charging methods A1 The most recent electronic charging methods are outlined below Charging method Method A UC 12Y UC 12YA Method B UC 24YJ UC 24YC UC 24YF UC 14YF2 UC 14YF UC 12YF UC 12YD UC 12YB dT dt Charging method Method C UC 24YJ UC 24YC Charging method Battery temperature Charging time dT dt Sudden tempera...

Page 24: ...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 25: ...ging impossible UC 14YF 60 C 60 C Charging impossible Charging impossible Charging impossible UC 12YF 60 C Charging impossible Charging impossible Charging impossible Charging impossible UC 12YD 60 C Charging impossible Charging impossible Charging impossible Charging impossible UC 12YB 60 C Charging impossible Charging impossible Charging impossible Charging impossible UC 12Y 40 C Charging imposs...

Page 26: ... 3 The terminal for charging high frequency transformer for power supply microcomputer for control IC etc are mounted on the circuit board 4 The circuit board is waterproof and secured to case B ass y with urethane resin It is impossible to remove only the circuit board Prism 8 Circuit board Case B Ass y 5 Tapping Screw W Flange D3 x 20 6 Fig 18 Cord armor Cord 3 ...

Page 27: ... 25 8 2 Wiring Diagram TAB terminal Case B ass y circuit board Terminal for charging 5 A fuse AC cord Varistor 8 3 Pilot Lamp Indications Refer to 5 3 4 Lamp indications on page 10 for details ...

Page 28: ...tance 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 a 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 the name ...

Page 29: ...rcuit board ass y Typical cause Refer to trouble mode A Checking procedure Refer to trouble mode B NO NO NO NO YES YES YES YES The charge time lamp and the charge status lamp fail to light Is there continuity between the blades of the AC cord plug Is there a break in the AC cord Is the fuse on the primary side blown Is the varistor damaged It is damaged if the resistance is 100Ω or less between th...

Page 30: ...ger or the battery dirty or deformed Clean or correct deformation Replace the battery Is the resistance between S and terminals 2 to 100 KΩ Is there continuity between T and terminals of Ni Cd battery without thermistor Faulty internal circuit Replace case B ass y Is the battery hot immediately after use when charging batteries EB 14S EB 14B EB 14H EB 1430H EB 1820 EB 18B EB 18H EB 1830H EB 24B an...

Page 31: ... 29 11 STANDARD REPAIR TIME UNIT SCHEDULES MODEL 10 20 30 40 Fixed Variable UC 24YJ Work Flow Case A Fuse Prism 60 min 50 Case B Ass y Cord General Assembly Terminal A Terminal B ...

Page 32: ...ELECTRIC TOOL PARTS LIST LIST NO F889 CHARGER Model UC 24YJ 2003 10 15 E1 Hitachi Power Tools 1 2 3 9 4 6 5 7 8 10 11 ...

Page 33: ...1 HITACHI LABEL 1 2 322 044 CASE A 1 3 318 262 CORD 1 4 322 358 VARISTOR 1 5 322 359 CASE B ASS Y 1 INCLUD 4 7 9 11 6 300 036 TAPPING SCREW W FLANGE D3X20 4 7 NAME PLATE 1 8 321 679 PRISM 1 9 322 360 FUSE 250V 5A 1 10 306 880 TERMINAL A 1 11 306 881 TERMINAL B 1 Printed in Japan 031015N ...

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