35
VSX-
8
21-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
Step 2: Power supply
CP1306 (pin 14)
IC1315 (pin 4)
CP1306 (pins 10, 11)
Is the voltage 0 to 3.3
V
?
Is the voltage 3.3
V
?
Is the voltage 12
V
?
Is the voltage 5
V
?
Is pin 6 (en) of IC1325
high?
Yes
Is +3.3
V
output voltage?
Yes
CP1304 (pins 1, 2)
Yes
CP1304 (pins 1, 2)
Yes
IC1305 (pins 7, 8)
Yes
Q1318 (collector)
Yes
Yes
IC1325 (pins 7, 8)
Yes
Is pin 5 of IC1315
an above 6
V
?
Yes
Check the parts and pattern
in the path. (CP306 pin 4)
Check the parts and pattern
in the path.
Replace Q1318,Q1319.
N
o
Replace IC1315.
Replace IC1325.
Replace IC1305.
Replace Q1318.
Yes
N
o
N
o
Diagonose the CPU Assy.
N
o
Diagonose the CPU Assy.
N
o
Diagonose the SUB CPU
(IC1316).
N
o
N
o
Is pin 6 (en) of IC1305
high?
Yes
Yes
Check the parts and pattern
in the path of Q1318, Q1319
etc.
Yes
N
o
Diagonose the SUB CPU
(IC1316).
N
o
Q1318 base voltage
is 2.6
V
?
N
o
Q1318 collector voltage
is 0
V
? (base is 3.3
V
)
N
o
N
o
Diagonose the MAI
N
Assy.
Is the voltage 12
V
?
Is the voltage 3.3
V
?
Is the voltage 3.3
V
?
N
o
Diagonose the MAI
N
Assy.
SUB_O
N
3.3
V
input
HDMI_12
V
HDMI_12
V
HDMI_5
V
HDMI_3.3
V
ABT1015 3.3
V
A
Summary of Contents for VSX-521-K
Page 13: ...13 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F ...
Page 17: ...17 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F D MAIN ASSY C AMP ASSY D MAIN ASSY E SUBWOOFER ASSY ...
Page 21: ...21 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F ...
Page 22: ...22 VSX 821 K 1 2 3 4 A B C D E F 1 2 3 4 4 5 D MAIN BLOCK DIAGRAM for VSX 921 K T D MAIN ASSY ...
Page 23: ...23 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F ...
Page 27: ...27 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F only P CPU ASSY Not used ...
