![background image](http://html.mh-extra.com/html/samsung/sgh-n300/sgh-n300_service-manual_1190924030.webp)
5. Flow Chart of Troubleshooting
5-1 Power ON
5-1
Flow Chart of Troubleshooting
'POWER ON'does not work
Charge the Battery
Check the Battery Voltage
is more than 3.2V
No
Yes
Yes
Replace Keypad
When the "END" key is
pressed, the voltage of "D107 pin3"
3.6V?
No
Yes
U117, pin10 > 3.2V
Check the circuit related to U117
No
END
U119, pin 5 3.0 V ?
Check the circuit related to U119
No
Yes
Check the initial operation
U110, pin5 3.0 V ?
Check U110 and related circuit
No
Yes
Check for the clock signal at R301,C302
Check the clock generation circuit
(related to U301 and U303)
No
Yes
Yes
Summary of Contents for SGH-N300
Page 2: ...Samsung Electronics Co Ltd Printed in Korea 06 2001 Rev 1 0 GH68 02097A ELECTRONICS ...
Page 11: ...Exploded Views and Parts List 1 8 1 10 Desk Top Charger DESK TOP CHARGER GH44 00206A ...
Page 12: ...2 1 PCB Diagrams Schematic Diagrams 2 PCB Diagrams 2 1 Main Top ...
Page 13: ...2 2 PCB Diagrams Schematic Diagrams 2 2 Main Bottom ...
Page 41: ...Flow Chart of Troubleshooting 5 12 J101 SPK101 U110 PWO1P PWO1N SPK SPK 6 2 3 SPK SPK ...