How it Works
Onkyo
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DTA-94
Schematic
11 pgs1.2 Mb0
Service Manual
2 pgs499 Kb0

Onkyo DTA-94 Schematic

PC BOARD CONNECTION DIAGRAM
DTA-9.4
SURROUND BACK LEFT
XLR
INPUT
RCA
SELECT
P301
S301
P302
R430
P608B
OFFSET
U15
POWER AMPLIFIR PC BOARD
P601C
-B
BLUE
E601
P601A
P9911B
P9911A
U3
RED
DC
MODULATOR
OR
TEMPERATURE
P704
+B
OUTPUT
OPERATION
WARNING
CURRENT
P601B
P607A
INDICATOR
P702
GNDC
E
-B
+B
To NAPS-7789
AC INLET
P995
NL
AC-G
P997A
WHT
WHT
BLK
AC-H
BLK
F901
P996A
NAETC-7801
AC INLET PC BOARD
P608A
+5VC
OUTPUT
P607B
P501
WHITE
RL701
RL501
Q512
P502
BLACK
E501
HEAT SINK
P303
U16
R710
P703
JL701A
JL701B
U6
NAPS-7792
Q506 Q505 Q511
RL502
GMUTE
PHTCP
OUTRL
FMUTE
ERR
P701
SURROUND LEFT
XLR
INPUT
RCA
SELECT
P301
S301
P302
R430
P608B
OFFSET
U15
POWER AMPLIFIR PC BOARD
P601C
-B
BLUE
E601
+B
RED
P601A
DC
OUTPUT
OPERATION
MODULATOR
WARNING
INDICATOR
OR
CURRENT
TEMPERATURE
P704
P607A
+B
P601B
P702
GNDC
E
-B
P608A
+5VC
OUTPUT
P607B
P501
WHITE
RL701
RL501
Q512
P502
BLACK
E501
P303
U16
R710
JL701A
JL701B
Q506 Q505 Q511
RL502
P701
GMUTE
PHTCP
OUTRL
FMUTE
ERR
P703
XLR
P302
R430
OFFSET
U15
POWER AMPLIFIR PC BOARD
HEAT SINK
P601C
-B
BLUE
E601
+B
P601A
RED
DC
OUTPUT
OPERATION
MODULATOR
WARNING
INDICATOR
OR
CURRENT
TEMPERATURE
P704
P607A
+B
INPUT
SELECT
-B
S301
P601B
LEFT
P301
P608B
P702
RCA
GNDC
P303
P608A
ERR
+5VC
OUTPUT
P607B
P501
P502
WHITE
BLACK
E501
RL701
RL501
Q512
U16
R710
JL701B
Q506 Q505 Q511
JL701A
RL502
GMUTE
PHTCP
OUTRL
FMUTE
P701
P703
U15
HEAT SINK
P601C BLUE
E601
RED
P601A
DC
MODULATOR
OR
TEMPERATURE
P704
E
CENTER
XLR
INPUT
RCA
SELECT
P301
S301
OFFSET
+B
P607A
P608B
P601B
P702
E
-B
P302
R430
POWER AMPLIFIR PC BOARD
-B
+B
OUTPUT
OPERATION
WARNING
INDICATOR
CURRENT
12V TRIGGER TERMINAL PC BOARD
12V TRIGGER IN
E9902
P9908A
P9910
E9903
To NAAF-7797
SURR BACK LEFT
SURR LEFT
LEFT
CENTER
RIGHT
SURR RIGHT
SURR BACK RIGHT
E
SURR BACK LEFT
SURR LEFT
LEFT
CENTER
RIGHT
To NAAF-7797
SURR RIGHT
SURR BACK RIGHT
+B
P9909
P9908B
U7
NAPS-7793
WARNING
POWERSUPPLY
CONTROL PC BOARD
D9805
F9801
P9907B
P9911C
YEL
T9801
AC-G
AC-H
P9904
JL9906A
BRN
U9
P9904A
NASW-7795
S9801
POWER
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POWER SWITCH PC BOARD
SURR BACK LEFT
SURR LEFT
LEFT
CENTER
RIGHT
To NAAF-7797
POWER
D9812
A
P9907A
K
STAND-BY
WARNING
D9813
SURR RIGHT
SURR BACK RIGHT
-B
U8
NAETC-7794
DISPLAY LED PC BOARD
OPERATION CHECK-4
OPERATION INDICATOR IN THE UNIT-1
DTA-9.4
(RED)
D705
DC OUTPUT
D705 (DC OUTPUT)
This LEDTurned on when DC voltage is detected between speaker output terminals. Spealer output relay is turned off while having detected DC voltage. The relay will return automatically, if DC voltage output is lost.
(ORANGE)
D710
MODULATOR
OPERATION
D710 (MODULATOR)
This LED shows the state of operation of an modulation circuit. Immediately after a power supply injection, the light is switched on, and this LED will put out the light, if operation of modulation circuit is started.
(RED)
D751
TEMPERATURE
OR
CURRENT
P601C BLUE
E601
P601A
-B
+B
RED
DC
OUTPUT
OPERATION
MODULATOR
OR
CURRENT
TEMPERATURE
P704
XLR
R430
WARNING
INDICATOR
U15
SELECT
OFFSET
P607A
NAAF-7797
INPUT
RCA
P601B
P702
OUTPUT
E501
RL701
RL501
Q512
L505
Q506 Q505 Q511
JL701A
RL502
P701
P703
D751 (TEMPERATURE OR CURRENT)
This LED is turned on when an unusual temperature rise and unusual over-current of an amplifier circuit are detected.
(RED)
D9805
POWER SUPPLY
WARNING
D9805(POWER SUPPLY WARNING)
This LED is turned on when abnormalities arise in the power supply circuit.
SUPPLY
WARNING
POWER
D9805
U7
P9908B
NAPS-7793
P9909
Q9803
Q9827
Q9806
F9801
P9907B
1A/125V
P9911C
YEL
AC-H AC-G
P9904
JL9906A
T9801
BRN
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OPERATION CHECK-5
OPERATION INDICATOR IN THE UNIT-2
DTA-9.4
U2
GND2 +12V PROT +12V RL­RL+
JL9906B
P903B
(RED)
NAPS-7789
P161
PROT TEST
E102
Q103
D161
PROT
RL+
RL-
GND2
D161
PROT
(RED)
REGULATED
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 the voltage difference between the positive power supply of secondary voltage, and the negative power supply.
D133 (REGULATED)
E122 E121
E126 E125
(RED)
LOW
CURRENT
E124 E123
E101
D136
+B
E114
E
-B
E113
E174
E175
P101A
L102
E192
TH1
TH2+
TH2-
E112
E173
L101
E191
D136 (LOW CURRENT)
This LED is turned on when a low load measure circuit operates. When the switching power supply of this unit has very little load to a power supply, the voltage of a secondary side output rises rapidly. In such a case, a problem is avoided by lowering voltage.
VOLTAGE
ADJUST
+B
+B
GND2
CTRL1
CTRL2
P131A
R139
REGULATED
D133
LOW
CURRENT
D136
D923
D920D921 D922
+B
-B
GND
VOLTAGE CHECK
P108
JL132B
This circuit may operate temporarily at the time of a power supply ON.
D161 (PROT)
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.
1. Over voltage detection of a secondary DC output.
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
NAPS-7788
(RED)
PRI DC
LIVE
U5
NAPS-7790
PRI
E906
L103
P101B
GND
SEC
E984
L906
UDD UJJ
UJJ
UDD
E986
UDD
D102 D101D104 D103
E990
T901
UJJ
P902A
E991
E988
E987
T902
E985B
E985A
UDD
UJJ
VC+
VC-
VC-
E904
E902
E901
SEC
P997B
RL-
BLK
AC-H
P996B
AC-G
WHT
P903A
RL+
GND2
PRI
RL902
PRIDC
E905
RL902
RL901
BLK P801A AC-H2
E982
P801B
AC-G2
WHT
D907
LIVE
E981
E903
E983
D902
D907 (PRI DC LIVE)
D907
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)
This LED lights up at the time of the usual operation. The light is put out when the thermal protection circuit of a primary power supply section operates.
P803A
SEC
TH1
GND2
TH2-
TH2+
CTRL1+BCTRL2
+B
T854
E895
R861
Q884
R848
TH1 PROT
Q851
D851
E806
JL805B
Q882
T852
Q881
T853
Q883
R181
T851
E892
E893
E894
PRI
E891
E881
AC-H2 AC-G2
P801C
P801C
E841
(RED)
TH1 PRO
Q813
Q842
D851
Q801
Q817
Q812
Q814
P902B
E989
FORTEST
12V INPUT +-
P904
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OPERATION CHECK-6
CAUTION IN THE CASE OF SPEAKER OUTPUT CHECK
The power amplifier circuit of DTA-9.4 is BTL system. Therefore, in case you check speaker output, should be careful of the following point.
1. Do not connect the minus side OUTPUT terminal, and ground of the unit (Fig-1).
2. Do not connect minus of each OUTPUT terminal. (Fig-2).
3. Cannot check with an oscilloscope between the plus side of an OUTPUT terminal, and Chassis GND. (Fig-3).
Fig-1
OUTPUT
LEFT
CENTER
Oscilloscope
DTA-9.4
RIGHT
Fig-2
LEFT
CENTER
RIGHT
Fig-3
LEFT
Chassis GND of unit
OUTPUT
OUTPUT
CENTER
RIGHT
Chassis GND of unit
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