SHARP VLH880U
Instrukcja Serwisowa

VL-H860U VL-H880U

Q2903 with FET always is "OFF" at DC input.
Q2901

NON REG 7.2V REG circuit
Q2903

SYS 3.3V

DC JACK input

Voltage detective circuit

VDC<11V

ADP-DET

Vcc DC input lived DC input "ON"

with JACK : OPEN "OFF" detection with out JACK : GND Short circuit

Battery voltage BATT.-DET detection

7-7. MAIN BATTERY CIRCUIT SECTION BLOCK DIAGRAM

14
VBATT=0 Charging off Vcc Lithium ion battery Current Voltage circuit section section LED_R Completion : Green light up CHG SW When the battery is installed , its turned "ON". RESET CHARGE-ON_L VCR-H Charge control IC System microcomputer LED_G

Green LED Red Current control detective

Charging : Red light up

VL-H870U VL-H875U VL-H890U