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How to Check for Trouble
Chapter 3.
This mobile phone basically consists of a base set and a remote set. If and when any trouble occurs
with the phone, you must first check and see which set is troubled in order to repair the trouble in a
timely manner. The easiest way to find out the troubled area is to check via the communication test
using another phone under normal operations. The way to check for trouble will be explained here
and is based on the repairs after finding out where the troubled area is.
3.1 BASE SET
3.1.1 How to Check for Trouble Regarding the Call
Connect the Power Source and
the Telephone Line
Yes
Is power LED ON?
Yes
When the
Ring Signal is supplied,
is there a ringing
sound in the remote set?
Yes
A
Samsung Electronics Co., Ltd
No
1. Check the adaptor
2. Check the power circuit (U900), LED2.
1. Check the Ring Detector circuit(surrounding circuit of
No
PC 201)and if the pulse is supplied when the ring is
entered in the pin (U1 No. 30).
－4－
SP-C501R
Is the ID setting done correctly?
When the wireless channel is
captured, does the dial tone
sound and is the call available?
Service Manual
Samsung Electronics Co., Ltd
A
Yes
1. Check the connection to the antenna.
2. Check the action of the RF-MODULE.
No
3. It is trouble related to the data signal path and
Yes
1. When dial tone does not sound, check the operating
No
2. If wireless transmitting is not available, then check
Yes
No
1. Check if speech IC (U500) pin No. 12 is high when
Is dialing available?
Yes
Diagnosis completion
－5－
SP-C501R
EEPROM (U2)
(ID transmitted/received from U1 to U400 is
connected through the wireless RF-MODULE).
conditions of loop circuit and surrounding circuit of
SPEECH IC (U500) and check to see if there is any
signal along the receiving path.
and see if there is any signal along the transmitting
path.
dialing.
Service Manual
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