Pioneer VSX-918V-K Service Manual page 43

5
A
Step 2-3: Input selection
SELA
CN1001 (Pin 5)
Is the
voltage "L"
No
when selecting IN1?
Diagnose the MAIN Assy.
And is the voltage "H"(5V)
when selecting
IN2?
Yes
SELB
CN1001 (Pin 4)
Is the
voltage "H"(5V)
No
when selecting IN1?
Diagnose the MAIN Assy.
And is the voltage "L"
when selecting
IN2?
Yes
Step 2-4: Hot Plug Detect
HPD_IN
CN1001 (Pin 7)
No
Check the JA301.
Is the voltage
"H" (5 V)?
If JA301 is failure, replace JA301.
Yes
HPD_SINK
CN1001 (Pin 6)
No
Is the voltage
Diagnose the MAIN Assy.
"H" (5 V)?
Yes
* When connected the source equipment to IN1;
HPD0
JA101 (Pin 19)
Is the
Check the IC101 and JA101.
No
voltage 5 V
If IC101 or JA101 is failure,
when selecting
replace IC101 or JA101.
IN1?
Yes
* When connected the source equipment to IN2;
HPD1
JA102 (Pin 19)
Is the
Check the IC101 and JA102.
No
voltage 5 V
If IC101 or JA102 is failure,
when selecting
replace IC101 or JA102.
IN2?
Yes
5
6
Step 2-5: SDA/SCL
IC102 (Pin 7)
a signal output in
constant period
IC102 (Pin 9)
a clock output in
constant period
IC101 (Pin 39)
there a same
signal as IC102-pin 7
IC101 (Pin 38)
there a same
signal as IC102-pin 9
IC101 (Pin 63)
there a same
signal as IC102-pin 7
when selecting
IC101 (Pin 64)
there a same
signal as IC102-pin 9
when selecting
VSX-918V-K
6
7
SDA (HDMI OUT)
Does
Check the JA301 and IC102.
No
If JA301 or IC102 is failure,
replace JA301 or IC102.
(0 to 5 V)
?
Yes
SCL (HDMI OUT)
Does
Check the JA301 and IC102.
No
If JA301 or IC102 is failure,
replace JA301 or IC102.
(0 to 5 V)
?
Yes
SDA_SINK
Is
Check the IC102 and IC101.
No
If IC102 or IC101 is failure,
(0 to 3.3V)
replace IC102 or IC101.
?
Yes
SCL_SINK
Is
Check the IC102 and IC101.
No
If IC102 or IC101 is failure,
(0 to 3.3V) replace IC102 or IC101.
?
Yes
* When connected the source equipment to IN1;
SDA (HDMI IN1)
Is
Check the IC101 and JA101.
No
If IC101 or JA101 is failure,
replace IC101 or JA101.
IN1?
(0 to 5 V)
Yes
SCL (HDMI IN1)
Is
Check the IC101 and JA101.
No
If IC101 or JA101 is failure,
replace IC101 or JA101.
IN1?
(0 to 5 V)
Yes
B
7
8
A
B
C
D
E
F
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