(No.XC045)1-5
Analog input :
The sound is not emitted.
8
C5, C6 Positive pin
Sine wave
NO
→
Connected check from J4 to C4, C5
YES
→
Check since 9
9
C28, 29 Positive pin
Sine wave
NO
→
Defect of IC2, IC3
YES
→
Check since 10
10
IC9
2pin (L ch),4pin (R ch)
(The volume is confirmed
in the maximum.)
Sine wave
NO
→
Defect of R99 and Check on circuit
in surrounding.
YES
→
Check since 11
11
IC9 10pin
DC approx. 3.3V
NO
→
Check of Q4, Q1, Q5, IC8
YES
→
Check since 12
12
IC9
9pin (L ch),7pin (R ch)
(The volume is confirmed
in the maximum.)
Sine wave
NO
→
Defect of IC9 and Check on circuit
in surrounding.
YES
→
J3 Check on circuit in surround-
ing.
Digital input :
The sound is not emitted.
13
IC10 1pin
(The DVD player etc. are
connected with an optical,
digital input.)
NO
→
Defect of J2
YES
→
IC10 and Check on circuit in sur-
rounding.
LED doesn't light.
(D4 to D11)
14
IC11 13pin
DC approx. 0V
NO
→
Defect of IC8 and Check on circuit
in surrounding.
YES
→
Defect of IC11 and Check on cir-
cuit in surrounding.
Symptom
Check point
Voltage and waves when
it is normal
Check part and breakdown parts