Audio Circuit - Hitachi DV-P250U Manual De Servicio

AUDIO CIRCUIT

S I G N A L S A T I C 1 5 0 1 ~ 4
I S Q 1 5 0 7 , Q 1 5 0 8 , Q 1 5 0 1
C O L L E C T O R V O L T A G E
I C 1 5 1 0 , I C 1 5 1 2 , I C 1 5 1 4
Chapter 1
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N O S O U N D
B R E A K D O W N
IS THERE
N o
B E F O R E I C 1 2 0 1
AN IMAGE?
Y e s
A R E I C 1 5 0 2
ARE IC1506 pin 2 +5V
pins 8, 9, 15, 20 N o
5 V ?
Y e s
B R E A K D O W N O F
A R E T H E R E
N o
pins 1, 2, 3, 5?
Y e s
B R E A K D O W N O F
I C 1 2 0 1
A R E T H E R E
A R E T H E R E
SIGNALS AT pins
N o S I G N A L S A T I C 1 5 0 1 ~ 4
13, 16 ?
pins 26, 27, 28 ?
Y e s
I S Q 1 5 0 5
B A S E V O L T A G E N o
0 V ?
B R E A K D O W N O F
Y e s
I S Q 1 5 0 6
B R E A K D O W N O F
C O L L E C T O R
N o
Q 1 5 0 5 O R Q 1 5 0 6
V O L T A G E
O R D 1 5 0 4
-8V?
Y e s
I S I C 1 5 0 1 ~ 4
B R E A K D O W N O F
pin 21 V O L T A G E N o
I C 1 5 0 1 ~ I C 1 5 0 4
5 V ?
Y e s
B R E A K D O W N O F
N o
Q 1 5 0 7 , Q 1 5 0 8 , Q 1 5 0 1
-8V?
Y E S
ARE SIGNALS AT
I C 1 5 0 7 , I C 1 5 0 8 ,
B R E A K D O W N O F
N o
I C 1 5 1 1 , I C 1 5 1 3
I C 1 5 0 7 , I C 1 5 0 8 , I C 1 5 1 2 ,
pins 1,7 ?
Y E S
ARE SIGNALS AT
B R E A K D O W N O F
I C 1 5 0 9 ,
N o
I C 1 5 0 9 , I C 1 5 1 0 , I C 1 5 1 2 ,
pins 1,7 ?
Y e s
B R E A K D O W N O F
Q 3 5 0 3 O R Q 3 5 0 4
Q 1 3 0 6 ~ Q 1 3 1 1
D 1 5 0 4 O R Z D 1 3 0 7
C H E C K I C 1 6 0 6
N o
& pin 1 +8V OR +8V LINE ETC.
Y e s
I C 1 5 0 6
B R E A K D O W N O F
Y e s
I C 1 5 0 1 ~ 4
N o
I C 1 6 0 1
I C 1 5 1 4
I C 1 5 1 4
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