AG-790 SERVICE MANUAL AM/FM Stereo Receiver Effective : April, 2003 S-0092A NOTES ● PC boards shown are viewed from parts side. ● The parts with no reference number or no parts number in the exploded views are not supplied. ● As regards the resistors and capacitors, refer to the circuit diagrams contained in this manual. ● £ Parts marked with this sign are safety critical components. They must be replaced with identical components - refer to the appropriate parts list and ensure exact replacement. CONTENTS 1 SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・2 2 ADJUSTMENTS AND CHECKS ・・・・・・・・・・・・・・・・・・・・・・・・3 3 EXPLODED VIEWS AND PARTS LIST ・・・・・・・・・・・・・・・・・6 4 PC BOARDS AND PARTS LIST ・・・・・・・・・・・・・・・・・・・・・・・・8
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AAGG--779900
SERVICE MANUAL
AM/FM Stereo Receiver
Effective : April, 2003 S-0092A
NOTES
● PC boards shown are viewed from parts side.● The parts with no reference number or no parts number in the
exploded views are not supplied.● As regards the resistors and capacitors, refer to the circuit diagrams
contained in this manual.●£ Parts marked with this sign are safety critical components. They
must be replaced with identical components - refer to the appropriateparts list and ensure exact replacement.
CONTENTS1 SPECIFICATIONS ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・22 ADJUSTMENTS AND CHECKS ・・・・・・・・・・・・・・・・・・・・・・・・33 EXPLODED VIEWS AND PARTS LIST ・・・・・・・・・・・・・・・・・64 PC BOARDS AND PARTS LIST ・・・・・・・・・・・・・・・・・・・・・・・・8
AM Tuner SectionTuning Range .......................... 530 kHz–1,720 kHz (10 kHz steps)Usable Sensitivity ............................................................ 55 dB/mTotal Harmonic Distortion .................................... 1 % at 85 dB/mSignal-to-Noise Ratio ........................................ 48 dB at 85 dB/m
GeneralPower Requirements.................................. 120 V/230 V, 50-60 Hz Power Consumption ............................................................ 180 W AC Outlets ................ Unswitched x 2, Total 100 W max (1 A max)Dimensions (W x H x D)................................ 435 x 139 x 335 mm
(17-1/8" x 5-1/2" x 13-3/16")Weight (net) ................................................ 9.4 kg (20-11/16 lbs)Standard Accessories .................................. AM Loop Antenna x 1
FM ”T” Type Antenna x 1Remote Control Unit x 1
• Design and specifications are subject to change without notice.
Voltage Conversion(General export models only)
Be sure to remove the power cord from the AC outlet beforerepositioning the voltage converter switch.
1. Locate the voltage selector on the rear panel.2. Using a flat-bladed screwdriver, set to the appropriate
230V or 120V position according to your area.
IN NORTH AMERICA USE ONLY ON 120 V SUPPLY.
2 ADJUSTMENTS AND CHECKS
-3-
2-1 AMPLIFIER SECTION
Bias Current Adjustment
1. Turn the unit on, and set the input selector switch to "CD".2. Set 7VR1 and 7VR2 to the center position.3. Connect the DC voltmeter as shown below after preheating for
10 minutes, and adjust 7VR2 (Lch) so that the voltagebecomes 3.3±1.3mV.
SCHEMATIC DIAGRAM AG-790 MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, SP JACK PCB, POWER PCB
7C3110P
7C3010P
S27R7810/2W
7R7710/2W
7V255401
S1PO
WE
R S
W
C1
103/
250V
FU26.3A/250V
1C15
6800
U/7
0V
1R3
15K
1C14
6800
U/7
0V
1R215K
1D101N5404
1D111N5404
1D121N5404
1D91N5404
7C22104
7C28
47U
/63V
1D15
4004
1D18 4004
1D144148
7R6910K
7R70
100
7R7347K
7R74
47K
1C1310U/63V
1R5 22K
7C27220U/16V
7C26220U/16V
1D13
4148
7R7210K
7C254U7/63V
7C23102
7R6356K
7R5922K
7V298050D
7V288050D
7V278050D
7V268050D
7C21
104
7R62
5.1/
2W7R
6022
K
7R61
5.1/
2W
7R71
10K
7C1747U/25V
7R511K
7R1522K
7R19100
7R17100
7V15551
7R11K
7C1
4U7/
50V
7R53K3
7R73K3
7R253K3/0.5W
7R29220
7C5
47U
/63V
7V35551
7R9100
7R11100
7R1322K
7V95401
7V15669A
7V195200
7V211943
7V17649A
7V135551
7V1155517V5
54017V7
5401
7C9104
7C1330P
7R313K3
7R331K5
7VR1300
7C1530P
7R35
220
7R213K3 7R23
3K3
7C747U/63V
7C11104
7R27
3K3/
0.5W 7R49
33K
7R37220
7R3933
7R43
0.33
/5W
7R45
0.33
/5W
7R47100
7R41100
7V235551
7R53
3K3
7R55
27K
7C194U7/50V
7L11.5uH
7L21.5uH
7C204U7/50V
7R56
27K
7R54
3K3
7V245551
7R42100
7R48100
7R46
0.33
/5W
7R44
0.33
/5W
7R4033
7R38220
7R5033K
7R28
3K3/
0.5W7C12
104
7C847U/63V
7R243K3
7R223K3
7R36
220
7C1630P
7VR2300
7R341K5
7R323K3
7C1430P7C10
104
7V85401
7V65401
7V125551
7V145551
7V18649A
7V221943
7V205200
7V16669A
7V105401
7R1422K
7R12100
7R10100
7V45551
7C6
47U
/63V
7R30220
7R263K3/0.5W
7R83K3
7R63K3
7C2
4U7/
50V
7R21K
7V25551
7R18100
7R20100
7R1622K
7R521K
7C1847U/25V
7R433K
7C4
100P
7C3
100P
7R333K
7C24
10U
/63V
7R672K7
7R68
3K3/
1W
7R64
510K
7D84148
7R65220K
7R66
4K7
1XS1
1XS2
1D31N4004
1D41N4004
1D21N4004
1D11N4004
1C1
100U
/35V
1R1100
1XS3
1D51N4004
1D81N4004
1D61N4004
1D71N4004
1C4
2200
U/2
5V
1C5
2200
U/2
5V
1N378M05
1N1
7812
1N2
7912 1C10
1000
U/1
6V
1C11
1000
U/1
6V
1C3
470U
/16V
1D16
4004
1D17
40041R
42K
2
1C12
100U
/25V
RELD
1FU16.3A/250V
1FU26.3A/250V
7D730V
7D124V
7D3
24V
7D224V
7D4
24V
7D1012V
7R5718K
7D54148
7D64148
7R5818K
12
1XP12
12
1XP13+12
-12V
AC 120V/230V
SEL.SWVOLTAGE
+5VG
123
1XP7
123
1XS7
SWB
SWA
RELARELB
1873245 7K17R75 680
7R76 680
1X1Speakers out
7C29103
RELC
ON
OF
F
ON
OF
F
7D114148
7D124148
R
LG
LR
1 2 3 4
1XS8
B C A V
1 2 3 4
1XP8
VACB
OFF OFF OFF ONONON
R
LG
1 2 3 4 5 6 7
1XS9
1 2 3 4 5 6 7
1XP9
AL
+A
R+
BL
+B
R+
AL
-
AR
-G
AL
+
BL
+
AR
+
BR
+
AL
-
BL
-
AR
-
BR
-A
L+
AR
+B
L+
BR
+A
L-
AR
-G
L R RL
L1-1
L1-2
C3103/250V
C2103/250V
AC JACK OUT
FU3
3.15
A/2
50V
1N4
7809
+9
+12VG
1 2 3 4 5 6 7
1XS4P
OW
2.1V
-24V
0V 2.1V
DG
ND
+5V
1D19
1N41
48
1D20
1N41
48
1D22
1N41
48
1D21
1N41
48
1C18
100U
/16V
1C19
220U
/16V
1FU3 2A/250V
1FU4 2A/250V
RL
FU12.5A/250V
1D2324V/1W
R-1
L-1
1 st Issue; March 2003AM/FM Stereo Receiver
AAGG--779900
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SCHEMATIC DIAGRAM AG-790 TUNER PCB
1234
1XS14
2L3 3.5T
2L2 4.5T
2X1
2T5
2C5152
*2R12 1K
2C37
100U
/10V
2C28203
2L4102
2C20203
2D1IN4148
2L5221
2C43203
2C38100U/10V
1 2
1XS13
2C45203
2C24102
2R202K
2R21 2K
2R22 2K
2G44.5M 2R23
2K4
2C4130
2C4230
2C44103
2R171K
2C403U3/50V
2V5C1815GR
2V4
C18
15G
R
2C46203 2C
4710
0U/1
6V2C
3947
U/1
6V
2R18
1K
2R198K2
1 2 3 1XS10
12
1XS12
XT1
XTN2
PERIOD3
CLOCK4
DATA5
OT-16
OT-27
OT-38
OT-49
I/O-510 I/O-6 11
VDD 12
AMIN 13
FMIN 14
GND 15
IFIN2 16
I/O-8 17
I/O-7 18
DO1 19
DO220
2N2TC9257F
2C16 203
*2TC12/7
2VD1V104
2VD3V149B
2C26
104
2C27104
2R11
3K3
2C361U/50V
2R133K3
2C354U7/50V
2C19102
2C22102
2C23102
2C21102
2R15300K
2R142K
2R9100K
2C10 501
2C15203
2C920
2R108K2
2R6 100K 2C13
203
2C4*7
2C6152
2R3 3K3
2R53K3
2C122032C8
1522C25104
2R4100
2R8100K
2C14203
2R7100K
2C7
152
2R1622K
2C34
220U
/10V
2C334U7/50V
2C324U7/50V
2C17682
2C18 682
2C3122U/16V
2G1 L10.7M2G2 450B
2R1 330
2C29
U1/
50V
2C330
2C2332C1
30 2L1
3.5T
2R2
330
2T3
2T2
2C11103
2VD
2V
104
2V1K161GR
2TC22/7 2T1
2VD4V149B
2V39014C
2V2 9018H
RFGND1
RFIN2
AMLCUT3
MIXOUT4
VCC5
AMIF6
FMIF7
GND8
AGC9
QUOD10
ROUT11
LOUT12 LPF2 13
LPF1 14
DETIN 15
DETO 16
IFREQ 17
ST 18
OSCO 19
AMOSC 20
FMOSC 21
AMRF22
RFVCC 23
FMRF 24
2N1TA2149N
2C51153
2C49153
2C48153
2C50153
2T4
2C52
203
LOOP75FM AM
RGL
+12V
G
+5V
G
DATA
CLOCK
PERIOD
ST
2C53 18
2T2
2G3
L10
.7M
2V99018H
2R29 300K
2R30 330
2R31 330
2C5422
2R32 15
2D2 IN4148
2C5547
1 st Issue; March 2003AM/FM Stereo Receiver
AAGG--779900
4 52 31
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SCHEMATIC DIAGRAM AG-790 FRONT PCB
INSTRUCTIONS FOR SERVICE PERSONNELBEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSEDPARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT.
AAGG--779900NOTES:£Parts marked with this sign are safety critical components.They must always be replaced with identical components-refer to the appropriate parts list and ensure exact replacement.