Samsung SP-C501R Service Manual page 5

3.1.2 How to Check the Trouble Regarding the LED BOARD
Connect the power source and the phone line
Yes
Is the power LED ON?
Yes
Is charging LED ON?
When placing the remote
set on the base set.
Yes
When the channel is captured,
is the in-use LED ON?
Yes
When pressing the page
button, does the ring tone
sound?
Yes
Diagnosis completion
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1. Check the adaptor.
No
2. Check if pin No. 9 of CON1/CON2 is 1.7V.
3. Check if pin No. 7 of CON1/CON2 is set to GND.
1. Remove the foreign substance in the charging
terminal.
No
2. Check the output of the base set (U600) is 9V.
3. Check if both ends of the charging terminals are 6V
when placing the remote set on the base set.
1. Check if pin No. 10 of CON1/CON2 changes
No
from high to low.
2. Check to see if the in-use LED is normal.
No 1. Check and see if pin No. 11 of CON1/CON2 goes
from high to low.
－6－
SP-C501R
3.2 REMOTE SET
Connect battery (Above 3.6V)
Is the ID appropriately enrolled?
Is the remote available for transmitting?
Service Manual Samsung Electronics Co., Ltd
Yes
1. Then check the power unit.
No
Is the LCD DISPLAY
2. Check the RESET circuit and the MPU
appearing correctly?
Yes
No
Is the phone book 1. For the MPU trouble, check the circuit of
correctly registered?
Yes
1. It is the trouble related to the DATA signal path.
No
2. ID transmitted/received from the MPU to the
Yes
1. The voice signal path is wrong.
No
2. Then check the MIC, MODEM(U2) and their
Yes
No
1. Then check the receiving unit, MODEM(U2) and the
Is the remote available
for receiving?
Yes
Diagnosis completion
－7－
SP-C501R
oscillation section (X1).
the EEPROM IC (U4).
MODEM is connected through the wireless RF-
MODULE.
surrounding circuits.
AMP circuit(U3).
Service Manual