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Circuit Description
4-10
Samsung Electronics
CHARGE MAIN PATH
MPU turns on Q8 or Q9 with high level output
from pin 2 for front port and pin 1 for rear port.
Q8 and Q9 pull down the base voltage level of
PNP TRQ3 and Q4. It turns on main path, then
charging is started.
DETECTION OF CHARGE VOLTAGE
The battery voltage of front port is divided by R28,
R30 and R32, measured as A/D value by MPU pin
12 through OP-amp. And the battery voltage of
rear port is divided by R29, R31 and R33, and
measured as A/D value by MPU pin 13.
BATTERY TEMPERATURE DETECTION
The temperature of the battery pack in the front
port and rear port is detected by R36/R37 and
R34/R35, respectively, and measured as A/D
value at MPU pin 15.
Analog switch U5 selects 2 channels (CH1 : pin 6,
CH2 : pin 7) sequentially by the Enable Pulse of
MPU pin 19 and assigns the NTC voltage of the
front and rear batteries to pin 1 of U5.
MONITORING AMBIENT TEMPERATURE
Ambient temperature is detected by R43 and
R44/R61+TH1 and measured by MPU pin 14.
As the temperature is very important, it is
constantly checked once program is started.
Summary of Contents for SCH-1000
Page 2: ...Samsung Electronics Co Ltd GH68 60563A Printed in Korea ...
Page 31: ...Samsung Electronics 6 1 6 Troubleshooting 6 1 Logic Section 6 1 1 No Power ...
Page 33: ...Samsung Electronics 6 3 Troubleshooting 6 1 3 Abnormal Backlight Operation ...
Page 34: ...Troubleshooting 6 4 Samsung Electronics 6 1 4 Abnormal Key Data Input ...
Page 35: ...Samsung Electronics 6 5 Troubleshooting 6 1 5 Abnormal Keytone ...
Page 36: ...Troubleshooting 6 6 Samsung Electronics 6 1 6 Abnormal Alert Tone ...
Page 37: ...Samsung Electronics 6 7 Troubleshooting 6 2 Transmitter Section ...
Page 38: ...Troubleshooting 6 8 Samsung Electronics ...
Page 39: ...Troubleshooting 6 9 Samsung Electronics 6 3 Receiver Section ...
Page 40: ...Troubleshooting 6 10 Samsung Electronics ...
Page 41: ...Samsung Electronics 6 11 Troubleshooting ...
Page 43: ...Troubleshooting 6 13 Samsung Electronics 6 4 2 No Power HHP PWR 5 8V 13 5V Supply ...
Page 44: ...Samsung Electronics 6 14 Troubleshooting 6 4 3 Hands Free RX Path ...
Page 45: ...Troubleshooting 6 15 Samsung Electronics 6 4 4 Hands Free TX Path ...
Page 46: ...Samsung Electronics 6 16 Troubleshooting 6 5 Desk Top Rapid Charger ...
Page 47: ...Troubleshooting 6 17 Samsung Electronics 6 6 Cigarette Lighter Adapter 6 6 1 Power Fault ...
Page 48: ...Troubleshooting 6 18 Samsung Electronics 6 6 2 LED On Fault ...
Page 49: ...Troubleshooting 6 19 Samsung Electronics 6 6 3 Charge Fault ...
Page 50: ...Troubleshooting 6 20 Samsung Electronics 6 7 Travel Charger ...
Page 52: ...Exploded View and its Parts List 7 2 Samsung Electronics 7 1 Main Set Exploded View ...
Page 54: ...Exploded View and its Parts List 7 4 Samsung Electronics 7 3 Hands Free Kit Exploded View ...
Page 62: ...Exploded View and its Parts List 7 12 Samsung Electronics 7 11 Main Set Packing Layout ...
Page 64: ...7 14 Samsung Electronics Exploded View and its Parts List 7 13 Hands Free Kit Packing Layout ...
Page 66: ...7 16 Samsung Electronics Exploded View and its Parts List ...
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Page 102: ...Electrical Parts List 9 30 Samsung Electronics ...
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