Pioneer VSX-1020-K Service Manual page 34

1
A
Step 4-3: HDMI IN 4 (Front IN)
CN1601 (Pin 18)
No
Is the voltage
around 5 V ?
O
Yes
B
CN1601 (Pins 15,16)
Does
No
a signal output in
constant period
?
Yes
CN1601
C
(Pins 1,3,4,6,7,9,10,12)
Is there
No
0.5Vp-p in CLK
and DATA?
Yes
IC1601 (Pins 48,49,51,
52,54,55,57,58)
D
Is there
No
0.5Vp-p in CLK
and DATA?
N
Yes
IC1601 (Pins 25,26,
28,29,31,32,34,35)
Is there
No
0.5Vp-p in CLK
and DATA?
E
N
Yes
A
To Step 5
F
34
1
2
V+5_F
Check the soldering of CN1601.
NG
Diagnose the F-HDMI Assy.
NG
Check the source equipment.
DDC (SDA/SCL)
Check the soldering of CN1601.
NG
Diagnose the F-HDMI Assy.
TMDS signal
Check the soldering of CN1601.
NG
Diagnose the F-HDMI Assy.
TMDS signal
Check the soldering between
IC1601 and CN1601.
TMDS signal
Check IC1601 and its peripheral
circuits.
2
3
Analog IN, HDMI OUT
Step 5: COMPONENT IN
Step 5-1: HDMI OUT (more than 480p)
CN1254 (Pin 14)
Is the voltage
"H" ?
P
Yes
CN1254 (Pins 2,4,6)
Is there a
analog video
signal? *
* Diagnose it from the COMPONENT Assy side.
Yes
Q1151,Q1155,Q1157
(Emitter), (side B)
Are the
signals output at
emitter?
Yes
IC1701 (Pins 2,5-8,12-19,
25-28,59-62,64),R1706
(side B)
Are the
signals output?
Yes
IC1807,IC1808(side B),
IC1809,IC1810(side B),
IC1811(side B)
(Pins 11-17)
Are the
signals output?
Yes
Whole
diagram
To Step 5-2
VSX-1020-K
3
4
COMPDET
No
Check CN1254 and diagnose
the COMPONENT Assy.
Y_IN, CB_IN, CR_IN
No
Check CN1254 and diagnose
the COMPONENT Assy.
SG_A, SG_B, SG_C
No
Check Q1151, Q1155, Q1157 and
its peripheral circuits.
Q** RXHSYNC, RXVSYNC, RXOCLK
No
Check IC1701 and its peripheral
circuits.
P** HSYNC, VSYNC, PDE, PDCLK
No
Check IC1807-IC1811 and its
peripheral circuits.
NG
Check IC1501 and its peripheral
circuits.
B
4