Toshiba FT-8901 Service Manual

Also see for FT-8901: Owner's manual

— 16 —3. The base and handset cannot be connected.Check whether the baseis able to set in the testmode 8.OKNGACheck IC4 and itsperipheral circuit.Check base RF unit.NGCheck the TX POWERand the TX FREQUENCYon the base unit.OKOKNG Check base RF unit.NG Check whether there is a250 Hz data waveform at“MOD” of RF unit.Check RT3, R76, R91,R49, C129, C122,C33 and C52.NGOKCheck base RF unit.OKNG Check whether there is a250 Hz data waveform atRT2 AF test point.Check IC3, Q1 and theirperipheral circuit.NGOKCheck whether there is a250 Hz data waveform atthe Q2 collector.Check RT2, Q2 and theirperipheral circuit.NGOKCheck whether there is a250 Hz data waveform atpin 64 of IC4.NGOKCheck IC4 and itsperipheral circuit.Check whether thehandset is able to set inthe test mode 1.OKNG Check IC604 and itsperipheral circuit.Check the TX POWERand the TX FREQUENCYon the handset unit.OKNG Check handset RF unit.OKCheck R27, R171, R172,IC1 and their peripheralcircuit.Set the base in the testmode 10, checkwhether deviation of theTX data is app. 9.0 kHzDev.Set the base in the testmode 13,902.952467MHz(250 Hz ±8 kHz Dev.)1mV output signal fromRF test point isa p p l i e d . D o e s t h eCHARGE LED light?