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Sharp SM-SX1 Service Manual page 35

1-bit amplifier
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• No sound at the analog input (Line 1 and Line 2) alone.
Is any signal input to CNP116 or CNP117?
No sound on both Line 1 and Line 2?
Is 5V supplied to drive the relays (RLY101, RLY102 and
RLY103)?
Is any signal supplied to the analog line amplifying units
Q321, Q322, Q324 and Q323?
Is any signal output from the analog line amplifying
units?
Is any signal output from CNP108?
Check the wiring to 1-bit amplifying unit, and 1-bit amplifying
unit.
• No sound on the digital input alone.
• No sound on Digitals 1 and 4 at all.
Is 5V supplied to Pin 8 of CNS800?
Is any digital signal output from Pin 9 of IC102?
Is any digital signal output from Pin 8 of IC103?
Is any digital signal input to P37 of IC800?
Is any digital signal from IC800 to IC801?
(DATA, MC-, WC, MCC)
Is any digital signal supplied from IC801 to IC803?
Is any initial setting signal supplied from Pins 38, 39 and
42 of IC803?
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Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check the wiring from the input terminal to CNP116 and
No
CNP117.
Check the wiring from RLY101, RLY102, RLY103 and the
No
relays to the microcomputer IC907.
Check IC302.
No
Check the wiring from RLY301, RLY302 and the relays to
the microcomputer IC907.
No
Check the line amplifying circuit.
No
Check IC303.
No
Check IC102.
No
Check the wiring of CNS800 and CNP800.
No
Check IC103.
Check the wiring of CNP800 and CNS800.
No
Check IC800 and IC802.
No
Check IC801.
No
Check the wiring from Pins 38, 39 and 42 of IC803 to the
No
microcomputer IC907.
– 35 –
SM-SX1/SX1W

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