Pioneer SC-27 Service Manual page 42

1
Step 2: X'tal
IC803 (Pins 5, 7) (side B)
A
Is there
No
a 27 MHz
output?
Yes
IC1300 (Pin 19)
Is there
No
a 36.864 MHz
input?
B
Yes
X1501 (Pins 1, 3)
Is there a
No
27 MHz input or
output?
Yes
IC1702 (Pin 7) (side B)
Is there
No
C
a 28.63636 MHz
output?
Yes
R1270
Is there
No
a 48 MHz
signal?
Yes
To Step 3
D
Step 3: RESET
R931 (side B)
Is the
No
voltage "H"
(around 3.3 V)
?
Yes
IC1300 (Pin 91)
E
Is the
No
voltage "H"
(around 3.3 V)
?
Yes
R1509
Is the
No
voltage "H"
(around 3.3 V)
?
F
Yes
42
1
2
CLK27EMMA CLK27AB1
Check IC803 and its peripheral
circuits.
Check IC1302 and its peripheral
circuits.
Check X1501 and IC1501
and its peripheral circuits.
Check IC1702 and its peripheral
circuits.
Check IC1251 and its peripheral
circuits.
XEMRST
Check the soldering and parts of
the path.
XGARST
Check the soldering and parts of
the path.
Check the soldering and parts of
the path.
2
3
R1851
Is the
voltage "H"
(around 3.3 V)
?
Yes
R9018
Is the
voltage "H"
(around 3.3 V)
?
Yes
R9118
Is the
voltage "H"
(around 3.3 V)
?
Yes
To Step 4
Step 4: HDMI IN, HDMI OUT
Step 4-1: HDMI IN/INBD 1,2
JA1602-JA1604 (Pin 18)
Is the voltage
around 5 V ?
Yes
JA1602-JA1604 (Pin 19)
Is the voltage
around 5 V ?
Yes
JA1602-JA1604 (Pins 15,16)
Does
a signal output in
constant period
?
Yes
JA1602-JA1604
(Pins 1,3,4,6,7,9,10,12)
Is there
0.5Vp-p in CLK
and DATA?
Yes
A
SC-27
3
4
XVSRST
No
Check the soldering and parts of
the path.
XHDTX1RST
No
Check the soldering and parts of
the path.
XHDTX2RST
No
Check the soldering and parts of
the path.
+5V
No
Check the soldering of JA1602-
JA1604 and the source equipment
connected in JA1602-JA1604.
Hot plug detect
No
Check IC1501 and its peripheral
circuits.
DDC (SDA/SCL)
No
Check the soldering of JA1602-
JA1604.
TMDS signal
No
Check the soldering of JA1602-
JA1604.
4