Tandy 102 Service Manual page 52

8. Cassette interface doesn't function
9
Check the TXC signals.
Is a modulated waveform output to pin 5 of the cassette connector during program
(DATA) save?
(If not, check M34, M19 , C63 and C64.)
Check the RXC signals.
Is a digital waveform input to the SID terminal of the CPU during program (DATA)
load?
(If not, check D5, D6, M30, M34 and M19.)
Check the remote circuit.
Check the relay (RY1), T6 and M14.
Check the cassette connector and cassette cable.
END
10. B.C.R. interface doesn't function
10
Check M34, M25, M19 and L5.
Check the power supply voltage VDD (+5V).
END