Pioneer VSX-821-K Service Manual page 36

1
A
A
IC1310 (pin 3)
Is the voltage 3.3 V?
Yes
IC1310 (pin 2)
B
Is the voltage 1.8 V?
Yes
HDMI 3.3V
IC1300 (pin 3)
Is the voltage 3.3 V?
Yes
C IC1300 (pin 2)
Is the voltage 1.2 V?
Yes
To Step 3
D
Step 3: Diagnosis
Each data lines confirmation checks it after standby off/on.
CP1306 (pin 10)
Is the voltage 0 to 3.3 V?
Yes
CP1306 (pin 11)
E
Is the voltage 0 to 3.3 V?
Yes
CP1306 (pin 12)
Is there a data input?
(0 to 3.3 V)
Yes
F
36
1
2
HDMI 3.3V
No
Check the parts and pattern
in the path.
HDMI 1.8V
No
Is IC1310 abnormally hot?
Yes
The output and GND may be
short-circuited. Check the
path between them.
No
Check the parts and pattern
in the path.
HDMI 1.2V
No
Is IC1300 abnormally hot?
Yes
The output and GND may be
short-circuited. Check the
path between them.
SUB_RESET
No
Diagonose the MAIN Assy.
SUB_PDN
No
Diagonose the MAIN Assy.
MAIN_IRQ
No
Diagonose the MAIN Assy.
VSX-821-K
2
3
No
Replace IC1310.
No
Replace IC1300.
CP1306 (pin 13)
Is there a data output?
(0 to 3.3 V)
Yes
CP1306 (pin 7)
Is there a data input?
(0 to 3.3 V)
Yes
CP1306 (pin 8)
Is there a data input?
(0 to 3.3 V)
Yes
B
3
4
SUB_IRQ
No
Check the parts and patterns
in the path IC706.
CSCK_MAIN
No
Diagonose the MAIN Assy.
SCDO_MAIN
No
Diagonose the MAIN Assy.
4