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Pioneer PDP-614MX Service Manual page 24

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Failure diagnosis of the Scanning IC
Check with a tester the resistance value between any pins indicated as NEGA and POSI of the
connector in the photos below. If a positive and a negative pin of the connector on the Scanning
Relay PKGs are short-circuited and remains short-circuited even after the connectors on the
Scanning PKG and Scanning Relay PKG are disconnected, the Scanning IC on the Scanning Relay
PKG is in failure.
Scanning PKG
NEGA
NEGA
POSI
POSI
Check points
Failure diagnosis of the Common PKG
Glass fuses (F1 and F2) at
the upper-right corner of
the Common PKG
Failure diagnosis of the Power HIC on the Common PKG
Scanning Relay PKG
(upper connector)
Between any pins of
NEGA and POSI blocks
OK: Short-
circuited,
NG: Open
D
(58~62)
E
(53~56)
F
(47~51)
G
(42~45)
H
(37~40)
I
(32~35)
PH2311
7-3
Scanning PKG
POSI
POSI
NEGA
NEGA
OK: k Ω or more,
NG: Short-circuited
Fusible resistor (R101) at the
lower-right corner of the Common
PKG: Approx. 2.2 Ω (1 W)
PH2311
(rear view)
Check points
Result:
Between A and B
OK: k Ω or more,
Between B and H
NG: Short-circuited
Between C and I
Between D and E
Between F and G
Note: A and D are ground.
Scanning Relay PKG
(lower connector)
OK: Short-
circuited,
NG: Open
1
9
11
A
(13~16)
20
B
(23~26)
C
(28~31)
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