SM-SX100
– 52 –
No
Check IC806.
No
• It does not sound at the analog input (Line 1 and Line 2) alone.
Yes
Is any signal input to CNP116 or CNP117?
Check the wiring from the input terminal to CNP116 and
CNP117.
No
Yes
Does it not sound on both Line 1 and Line 2?
Check the wiring from RLY101, RLY102, RLY104 and the
relays to the microcomputer IC904.
No
Yes
Is 5V supplied to drive the relays (RLY101, RLY102 and
RLY104)?
Check IC107.
No
Yes
Is any signal supplied to the analog line amplifying units
Q613, Q614, Q617 and Q618?
Check the wiring from RLY201, RLY601, RLY602 and the
relays to the microcomputer IC904.
No
Is any signal output from the analog line amplifying
units?
Check the line amplifying circuit.
Yes
Is any signal output from CNP108?
Yes
Check the wiring to 1-bit amplifying unit, and 1-bit amplifying
unit.
No
• It does not sound on the digital input alone.
Yes
Is 5V supplied to Pin 3 of CNP801?
Check IC108.
No
Yes
Is any digital signal output from Pin 9 of IC801?
Check IC801.
No
Yes
Is any digital signal output from Pin 4 of IC802?
Check the wiring of CNP801 and CNS801.
Check IC802.
No
Yes
Is any digital signal input to P37 of IC804?
Check the wiring of CNP801 and CNS801.
No
Is any digital signal from IC804 to IC806?
(DATA, MC-, WC, MCC)
Check IC804 and IC805.
Yes
Is any digital signal supplied from IC806 to IC807?
Yes
Is any initial setting signal supplied from Pins 38, 39 and
42 of IC807?
• It does not sound on Digitals 1 to 4 at all.
No
Check the wiring from Pins 38, 39 and 42 of IC807 to the
microcomputer IC904.
Yes
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