PDP-427XD
92
1
2
3
4
1
2
3
4
C
D
F
A
B
E
Yes
No
Yes
Yes
No
Has the sound of the Analog
broadcasting output?
Is a signal input to IC4701?
(pins 22, 23)
Check the communications around the
IC4701 and between the IC4701 and
the microcomputer. If there was no
ploblem, replace the MAIN Assy.
Check the communications around
the U4501 (FE) and between the
U4501 and IC4701.
NG Replace the U4501 (FE) and
repair the failure points.
51
50
Yes
OK
No
No
Yes
Has the sound of the HDMI
output?
Is a signal output from IC5402?
(pins 7, 8)
Check the communications around the
IC4701 and between the IC4701 and
the microcomputer. If there was no
ploblem replace the MAIN Assy.
Check the FFC and cables between
the MAIN Assy and R07 DT Assy.
Does not sound output even if replace
them?
Poor contact of the connector or
FFC, or cable is defective.
Replace FFC or cable.
Is a signal output from IC5401?
NG
Replace the IC5401.
Replace the IC5402.
53
52
Yes
Yes
Yes
No
No
No
Has the sound of the Digital
broadcasting output?
Yes
No
Has the sound of the SCART input
or PC input output?
Is a signal input to IC4701?
(pins 19, 20)
Check the communications around the
IC4701 and between the IC4701 and
the microcomputer. If there was no
ploblem replace the MAIN Assy.
Is a signal input to IC4000 of the
R07 DT Assy?
No
Replace the R07 DT Assy.
Check around IC4000 and repair
the failure points.
Check between input terminal and
CN4004 and CN4005 and repair
the failure points.
51
50
Yes
Yes
Yes
Yes
No
Is a signal input to IC4701?
Check the communications around the
IC4701 and between the IC4701 and
the microcomputer. If there was no
ploblem replace the MAIN Assy.
Check the communications around the
IC4701 and between the IC4701 and
the microcomputer. If there was no
ploblem replace the MAIN Assy.
51
50
Check between side input terminal
and CN4004 and CN4005 and
repair the failure points.
No
Is a signal input to IC4701?
51
50
Flowchart of Failure Analysis for The Audio System
A
Replace the FFC.
NG
Check the FFC between CN8802
and CN4004 or between CN9003
and CN4005, or check around the
input terminals.
No
Has the sound of the side input
output?
Replace the cables.
NG
Replace the FFC.
NG
Check the cables between CN9002
and CN9205 or between CN9001
and CN9202, or check around the
pin jack.
Yes
Check the FFC between CN8802
and CN4004 or between CN9003
and CN4005.
50
IC4701 - pin 22
V: 1 V/div H: 400
µ
S/div
Waveforms
Input signal: L/R 1 kHz
51
IC4701 - pin 23
V: 1 V/div H: 400
µ
S/div
52
IC5402 - pin 7
V: 1 V/div H: 400
µ
S/div
53
IC5402 - pin 8
V: 1 V/div H: 400
µ
S/div
Содержание PDP-4270XA
Страница 20: ...PDP 427XD 20 1 2 3 4 1 2 3 4 C D F A B E 2 6 PANEL CHASSIS SECTION 1 2 4 5 8 8 8 8 8 8 7 10 12 14 3 6 9 13 11 ...
Страница 185: ...PDP 427XD 185 5 6 7 8 5 6 7 8 C D F A B E Block Diagram R2S11002AFT MAIN ASSY IC4701 AV SW ...
Страница 186: ...PDP 427XD 186 1 2 3 4 1 2 3 4 C D F A B E Block Diagram R2S11001FT MAIN ASSY IC4901 Component SW IC ...