SM-SX100
– 53 –
No
Yes
Is any 1-bit signal from Pins 27 and 33 of IC807 output
to RLY801?
Check IC808, IC809, IC811, IC812 and IC813.
No
Yes
Does RLY801 and RLY802 operate?
Check the operation of Q801 and Q802 and the wiring of
each to the microcomputer IC904.
Check the wiring from B1108/CNS108 to CNP107 and
1-bit amplifying unit.
From the front page
No
• It does not sound at DIGITAL1 or DIGITAL4 alone.
Yes
Is any digital signal output from Pin 8 or 10 of IC802?
Check RX801, RX802 and IC802.
No
Is any digital signal output from Pin 9 of IC801?
Check IC801 and input A, B terminal logic.
No
• It does not sound at DIGITAL2 or DIGITAL3 alone.
Yes
Is any digital signal output from Pin 8 or 6 of IC803?
Check CNS803.
Check the wiring from CNS803 to IC803.
No
Is any digital signal output to Pin 9 of IC801?
Check IC801 and input A, B terminal logic.
No
• 1-bit amplifying section check (Signal is output from CNP107 and CNP108 but it does not sound.)
Yes
Is any signal output form Pins 2, 3, 5 and 6 of ICA1?
(Fig. 54-1)
Check the waveform of the input pin, ICA1, voltage supplied
to ICA1 and ICA1 oscillating circuit.
No
Are the waveforms of QA1 to QA8 proper?
(Fig. 54-2, Fig. 54-3, Fig. 54-4)
Check ICA2, ICA3, QA1 to QA7.
Yes
No
Are the waveforms of ICA4 to ICA7 proper? (Fig. 54-5)
Check ICA4 to ICA7.
Yes
No
Are the waveforms of QA9 to QA16 proper?
(Fig. 54-6, Fig. 54-7)
Check RA53 to FA60 and QA9 to QA16.
Yes
No
Is any signal output from CNWAM6 and CNWAM7?
Check LA802 to LA808.
Check the soldering.
Yes
Check the surrounding of the relay PWB.
