Tandy 102 Service Manual page 50

5. Clock doesn't function
5
Check the power supply voltage.
• When power is ON: +5V
• When power is OFF: 2.0 - 4.OV
(If not normal, check power supply circuit.)
Check oscillation frequency (f = 32.768 kHz).
(If not normal, check X1, C17, C18 and M18.)
Check that a 250-Hz pulse is output from TP signal.
Check the clock- setting ICs (M14 and M25) and RESET signal.
END
6. Reset doesn 't function
6
Check the RESET circuit.
(Check T11, T10, T9, T25, D20, D12 and C78.)
Check all ICs which have RESET and RESET signals.
(Check M19, M25, M22 , M14, M27 , M36 and M31. Also check the LCD unit and
RAM.)
END
5-6