Pioneer VSX-918V-S Service Manual page 43

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