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OPERATION CHECK-5
OPERATION INDICATOR IN THE UNIT-2
U2
NAPS-7789
P161
E122
PROT
TEST
E126
Q103
GND2
+12V
PROT
+12V
RL-
PROT
RL+
JL9906B
P903B
(RED)
CURRENT
D161 (PROT)
(RED)
D161
This LED is turned on when the protection circuit of a power supply operates.
The protection circuit of a power supply section consists of following detection circuits.
PROT
1. Over voltage detection of a secondary DC output.
TE
L 13942296513
2. Thermal detection of primary power supply circuit.
3. Thermal detection of secondary power supply circuit.
This LED may be turned on only for a moment. It is because the state of a protection circuit is not held in NAPS-7789.
U1
E904
NAPS-7788
E902
E901
U5
www
NAPS-7790
.
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D133 (REGULATED)
(RED)
This LED is turned on when the voltage of a secondary power supply output is normal.
D133
The detection circuit which is source of the drive about this LED is supervising only
REGULATED
the voltage difference between the positive power supply of secondary voltage, and the
negative power supply.
+B
E114
E121
E
E124
E125
E123
-B
E173
E174
E175
P101A
E113
E192
D136 (LOW CURRENT)
This LED is turned on when a low load measure circuit operates.
D136
When the switching power supply of this unit has very little load to a power supply,
LOW
the voltage of a secondary side output rises rapidly.
In such a case, a problem is avoided by lowering voltage.
This circuit may operate temporarily at the time of a power supply ON.
P903A
E905
BLK
BLK
P801A
AC-H
AC-H2
P996B
P997B
E982
AC-G
WHT
PRI DC
D907
LIVE
E981
E903
E983
D902
D907 (PRI DC LIVE)
This LED is turned on when the electric charge remains in the primary side capacitor.
Do after discharging by resistance and checking putting out lights of this LED, when
disassembling a unit.
D851 (TH1 PROT)
(RED)
This LED lights up at the time of the usual operation.
D851
The light is put out when the thermal protection circuit of
TH1 PRO
a primary power supply section operates.
SEC
Q801
Q817
Q851
E806
Q813
Q812
E841
T853
T854
x
ao
Q814
y
E895
i
Q884
Q883
Q842
P902B
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8
VOLTAGE
ADJUST
E112
VOLTAGE
P131A
R139
CHECK
P108
REGULATED
LOW
CURRENT
E191
D923
D921
D920
D922
Q Q
3
6 7
1 3
E906
L103
D104
D103
SEC
P101B
E990
GND
E988
PRI
E984
T901
L906
E986
UDD
UJJ
UDD
UJJ
UDD
UDD
UJJ
P902A
R181
TH1 PROT
PRI
D851
T852
T851
u163
JL805B
.
Q882
Q881
2 9
9 4
2 8
1 5
0 5
8
2 9
9 4
D102
D101
E991
E989
E987
T902
E985B
E985A
UJJ
AC-H2
AC-G2
m
P801C
co
DTA-9.4
9 9
2 8
9 9
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