
Circuit Description
4-12
Samsung Electronics
When the battery is being charged, U23B becomes
high and the output voltage of U24A pin 2 returns
to the reference.
When the battery is fully charged, the battery
temperature is increased. After detecting the
temperature, if the U24A pin 2 is greater than pin
3, the output status of U23 and U24 are as follows:
OUT-A
OUT-B
Q21
Q20
U23
L
H
U24
L
H
OFF
OFF
When charging is completed, 20mA trickle current
flows through R24, R25, and D21. Q24 turns on,
and red LD1 turns off. Latch circuit operates so
that U24A remains in low and trickle current is
supplied to the battery. The latch is released when
AC power turns off or the battery is removed from
the main body.
Содержание SCH-1900
Страница 2: ...Samsung Electronics Co Ltd GH68 60620A Printed in Korea ...
Страница 27: ...Samsung Electronics 6 1 6 Troubleshooting 6 1 Logic Section 6 1 1 No Power ...
Страница 28: ...Troubleshooting 6 2 Samsung Electronics 6 1 2 Abnormal Initial Operation Normal 3 3V voltage source ...
Страница 29: ...Samsung Electronics 6 3 Troubleshooting 6 1 3 Abnormal Backlight Operation ...
Страница 30: ...Troubleshooting 6 4 Samsung Electronics 6 1 4 Abnormal Key Data Input ...
Страница 31: ...Samsung Electronics 6 5 Troubleshooting 6 1 5 Abnormal Keytone ...
Страница 32: ...Troubleshooting 6 6 Samsung Electronics 6 1 6 Abnormal Alert Tone ...
Страница 33: ...Samsung Electronics 6 7 Troubleshooting 6 2 Transmitter Section ...
Страница 34: ...Troubleshooting 6 8 Samsung Electronics ...
Страница 35: ...Troubleshooting 6 9 Samsung Electronics 6 3 Receiver Section ...
Страница 36: ...Troubleshooting 6 10 Samsung Electronics ...
Страница 37: ...Samsung Electronics 6 11 Troubleshooting ...
Страница 39: ...Troubleshooting 6 13 Samsung Electronics 6 4 2 No Power HHP PWR 5 8V 13 5V Supply ...
Страница 40: ...Samsung Electronics 6 14 Troubleshooting 6 4 3 Hands Free RX Path ...
Страница 41: ...Troubleshooting 6 15 Samsung Electronics 6 4 4 Hands Free TX Path ...
Страница 42: ...Samsung Electronics 6 16 Troubleshooting 6 5 Desk Top Rapid Charger ...
Страница 43: ...Troubleshooting 6 17 Samsung Electronics 6 6 Cigarette Lighter Adapter 6 6 1 Power Fault ...
Страница 44: ...Troubleshooting 6 18 Samsung Electronics 6 6 2 LED On Fault ...
Страница 45: ...Troubleshooting 6 19 Samsung Electronics 6 6 3 Charge Fault ...
Страница 46: ...Troubleshooting 6 20 Samsung Electronics 6 7 Travel Charger ...
Страница 48: ...Exploded View and its Parts List 7 2 Samsung Electronics 7 1 Main Set Exploded View ...
Страница 50: ...Exploded View and its Parts List 7 4 Samsung Electronics 7 3 Hands Free Kit Exploded View ...
Страница 52: ...Exploded View and its Parts List 7 6 Samsung Electronics 7 5 Hands Free Kit Cradle Exploded View ...
Страница 54: ...Exploded View and its Parts List 7 8 Samsung Electronics 7 7 Desk Top Rapid Charger Exploded View ...
Страница 57: ...Exploded View and its Parts List Samsung Electronics 7 11 7 10 Travel Charger TRAVEL CHARGER ASS Y GH44 40011A ...
Страница 58: ...Exploded View and its Parts List 7 12 Samsung Electronics 7 11 Main Set Packing Layout ...
Страница 60: ...7 14 Samsung Electronics Exploded View and its Parts List 7 13 Hands Free Kit Packing Layout ...
Страница 62: ...7 16 Samsung Electronics Exploded View and its Parts List ...
Страница 63: ......
Страница 64: ......
Страница 65: ......
Страница 66: ......
Страница 67: ......
Страница 68: ......
Страница 99: ......
Страница 100: ...10 2 Hands Free Kit Block Diagram ...
Страница 101: ...10 3 Desk Top Rapid Charger Block Diagram ...
Страница 102: ...10 4 Cigarette Lighter Adapter Block Diagram ...
Страница 103: ...10 5 Travel Charger Block Diagram ...
Страница 104: ......
Страница 105: ......
Страница 106: ......
Страница 107: ......
Страница 108: ......
Страница 109: ......
Страница 110: ......
Страница 111: ......
Страница 112: ......