Flow Chart Of Troubleshooting; Power On - Samsung SGH-R200 Service Manual

5. Flow Chart of Troubleshooting

5-1 Power ON

'POWER ON'does not work
Check the Battery Voltage
pressed, the voltage of "D109 pin1"
Check for the clock signal at R320
Check the initial operation
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
is more than 3.2V
Yes
When the "END" key is
3.6V?
Yes
U101 pin 2,3 > 3.2V
Yes
U103 pin 1 3.0 V ?
Yes
U103 pin2 3.0 V ?
Yes
Yes
END
No
Charge the Battery
No
Replace Keypad
No
Check the circuit related to U101
No
Check the circuit related to U103
No
Check U103 and related circuit
No
Check the clock generation circuit
(related to U305 and Q301)
5-1