Pioneer SC-27 Service Manual page 45

5
Step 5-2: Component IN (at 480i), HDMI OUT
Perform the same check items up to those
for Q1151, Q1155 and Q1157 of Step 5-1.
IC1805 (Pins 2-9) (side B)
IC1806 (Pin 2) (side B)
Are the
No
Check IC1701 and its peripheral
signals output?
circuits. Check the soldering.
Yes
IC800 (through hole)
(Pins E13,D13,E12,D12,E11,
D11,E10,D10,D15) (side B)
No
Check IC1805 and IC1806 and its
Are there
peripheral circuits.
signals?
Check the soldering.
Yes
R872-R875,R878 (side B),
R879,R884-R887
No
Check IC800 and its peripheral
Are there
signals?
circuits. Check the soldering.
Yes
Replace the DIGITAL MAIN Assy.
IC1801 (Pins 11-13),
IC1802, IC1803 (Pins 11-18),
IC1804 (Pin 4)
Are the
No
Check IC1801 to IC1804 and its
signals output?
peripheral circuits.
Yes
B
To Step 6
5
6
C
VDQ
VDOCLK
VID0-7, VICLK
VOD0-7,VOCLK
D
PHSYNK, PVSYNK, PDE
P**
PCLK
6
7
Step 6: S IN, HDMI OUT
CN1251 (Pin 11)
Is the
No
voltage "H"?
Yes
CN1253 (Pin 18)
Is there a No
color signal
?
Yes
CN1253 (Pin 20
Is there a
No
luminance
signal?
Yes
IC1701 (Pins 34,46) (side B)
Are there
No
color and luminance
signals?
Yes
C
To Step 7
Step 7: COMPOSITE IN, HDMI OUT
CN1253 (Pin 20)
No
Is there a
signal?
Yes
IC1701 (Pin 36) (side B)
No
Is there a
signal?
Yes
C
To Step 8
SC-27
7
8
SDET
Check CN1251 and diagnose
the COMPONENT Assy.
A_VSCIN
Check CN1253 and diagnose
the COMPONENT Assy.
A_VVYIN
Check CN1253 and diagnose
the COMPONENT Assy.
A_VVYIN, A_VSCIN
Check the soldering between
IC1701 and CN1251, CN1253
and its peripheral circuits.
A_VVYIN
Check CN1253 and diagnose
the COMPONENT Assy.
A_VVYIN
Check the soldering between
IC1701 and CN1253 and its
peripheral circuits.
8
A
B
C
D
E
F
45