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This service manual describes the latest service information connect the charger to an AC adapter or a DC for the BC-119N DESKTOP CHARGER/BC-121N MULTI- power supply that uses more than 20 V (BC-121N: 16 V). CHARGER at the time of publication.
SECTION 2 CIRCUIT DESCRIPTION 2-1 DC-DC CONVERTOR CIRCUIT 2-2 CONSTANT-CURRENT CIRCUIT (STEP-UP/DOWN CONVERTOR) The constant-courrent circuit consists of DC-DC convertor circuit (Q5, D6, D7, L2), IC4, IC5, R24, R44, and R45. The DC-DC convertor circuit regulates the charging voltage from an AC adapter or a power supply to appropriate values The current detector circuit (R24) detects a charging current for various battery pack.
2-4 CHARGING CURRENT AND VOLTAGE CHART IC2 pin number Rapid charging Low- Max. current battery voltage AD-101 BIT1 BIT2 BIT3 BIT4 BC-79 BC-119 (mA) High High High High High High High 11.5 High High High High High High High High High High High...
[BC-121N ONLY]: Same adjustment as step 1 for MAIN-A–MAIN-F units. • MAIN UNIT TOP VIEW Reference voltage check point Power supply AC adapter 12 V 16 V/1 A [BC-121N] 12 V 20 V/1 A [BC-119N] Reference voltage adjustment 3 - 1...
SECTION SECTION 6 PARTS LIST SEMI-CONDUCTOR INFORMATION 6-1 TRANSISTORS 6-2 DIODES NAME SYMBOL INSIDE VIEW NAME SYMBOL INSIDE VIEW 1SS355 2SA1576 R 2SB1132 R BARB DAN202K 2SC4081 R SB20-03P DTC144EU S2 S2 UPA1890 GR A1890 D1 S1 S1 XP6501 AB 6 - 1...
SECTION 7 BOARD LAYOUTS MAIN UNIT (COMMON) to ADAPTOR • TOP VIEW In a BC-121N MAIN-B unit MAIN-C unit MAIN-D unit MAIN-E unit MAIN-F unit DC-IN In a BC-119N DC-IN 7 - 1...
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