Samsung SP-C501R Service Manual

Also see for SP-C501R: User manual

Contents

－5－Samsung Electronics Co., Ltd Service ManualSP-C501R－4－Samsung Electronics Co., Ltd Service ManualChapter 3. How to Check for Trouble SP-C501RThis mobile phone basically consists of a base set and a remote set. If and when any trouble occurswith the phone, you must first check and see which set is troubled in order to repair the trouble in atimely manner. The easiest way to find out the troubled area is to check via the communication testusing another phone under normal operations. The way to check for trouble will be explained hereand is based on the repairs after finding out where the troubled area is.3.1 BASE SET3.1.1 How to Check for Trouble Regarding the CallConnect the Power Source andthe Telephone LineYesNoYesNoYesAIs power LED ON?When theRing Signal is supplied,is there a ringingsound in the remote set?1. Check the adaptor2. Check the power circuit (U900), LED2.1. Check the Ring Detector circuit(surrounding circuit ofPC 201)and if the pulse is supplied when the ring isentered in the pin (U1 No. 30).Diagnosis completionYesNoYesNoYesYesAIs the ID setting done correctly?When the wireless channel iscaptured, does the dial tonesound and is the call available?1. Check the connection to the antenna.2. Check the action of the RF-MODULE.3. It is trouble related to the data signal path andEEPROM (U2)(ID transmitted/received from U1 to U400 isconnected through the wireless RF-MODULE).1. When dial tone does not sound, check the operatingconditions of loop circuit and surrounding circuit ofSPEECH IC (U500) and check to see if there is anysignal along the receiving path.2. If wireless transmitting is not available, then checkand see if there is any signal along the transmittingpath.NoIs dialing available? 1. Check if speech IC (U500) pin No. 12 is high whendialing.