Teac AG-790 User manual

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 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

1 SPECIFICATIONS
−2−
Amplifier Section
Output Power....100 + 100 watts RMS (0.9 % THD, 1 kHz, 8 ohms)
Total Harmonic Distortion.................... 0.05 % (at 70 watts,1 kHz)
Input Sensitivity/Impedance .................. PHONO: 5 mV/22 kohms
LINE: 300 mV/22 kohms
Frequency Response ...................... PHONO: 20 Hz–20 kHz, ±3 dB
LINE: 20 Hz–50 kHz, +1/–3 dB
Signal-to-Noise Ratio ................................ PHONO: 80 dB (IHF-A)
LINE: 80 dB (IHF-A)
Tone Control ............................................ BASS: ±10 dB at 100 Hz
TREBLE: ±10 dB at 10 kHz
Loudness Control (Volume at –40 dB Position)..............................
+9 dB at 100 Hz, +8 dB at 10 kHz
FM Tuner Section
(Without notes 98.1 MHz, 65 dBf)
Tuning Range .................... 87.5 MHz–108.0 MHz (100 kHz steps)
Usable Sensitivity (IHF) ............................................ Mono: 20 dBf
50 dB Quieting Sensitivity................ Mono: 39 dBf, Stereo: 46 dBf
Capture Ratio ...................................................................... 2.8 dB
Image Rejection Ratio .......................................................... 20 dB
AM Suppresion Ratio............................................................ 48 dB
Harmonic Distortion (1 kHz) .............. Mono: 0.4 %, Stereo: 0.5 %
Frequency Response................................ 30 Hz–15 kHz, +2/–3 dB
Stereo Separation (1 kHz) .................................................... 35 dB
Signal-to-Noise Ratio ........................ Mono: 57 dB, Stereo: 55 dB
AM Tuner Section
Tuning Range .......................... 530 kHz–1,720 kHz (10 kHz steps)
Usable Sensitivity ............................................................ 55 dB/m
Total Harmonic Distortion .................................... 1 % at 85 dB/m
Signal-to-Noise Ratio ........................................ 48 dB at 85 dB/m
General
Power 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 1
Remote 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 before
repositioning 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 voltage
becomes 3.3±1.3mV.
4. Adjust 7VR1 (Rch) in the same way.
7VR17VR2
7R46 7R44
0.33/5W 0.33/5W
DC voltmeter
7R45 7R43
0.33/5W 0.33/5W
DC voltmeter
MAIN PCB

−4−
ITEM SETTING ADJUSTMENT
POINTS ADJUST
2. AM Sensitivity
∫
600 kHz/1500 kHz
50 dB/m
400 Hz (30 % Mod)
ç
REC OUT
AM 600 kHz 2T1 (BLK) Max.
3. AM IF
∫
1000 kHz
50 dB/m
400 Hz (30 % Mod)
ç
REC OUT AM 1000 kHz 2T3 (WHT) Max.
4. FM Sensitivity
∂
90 MHz
10~20 dBf
1 kHz (100 % Mod)
ƒ
REC OUT FM 90 MHz 2L2 (4.5T) Max.
5. FM Distortion
∂
98 MHz
60 dBf
1 kHz (100 % Mod)
©
REC OUT FM 98 MHz 2T4 (PINK) Min. distortion
6. FM Stereo
∂é
98 MHz
60 dBf
Stereo signal L-R
©
REC OUT FM 98 MHz 2T5, 2T6 Min. distortion
1. VT Adjust
å
2R19 (VT)
2J2 (GND)
FM 87.5 MHz 2L3 (3.5T) DC 1.0±0.05V
INPUT OUTPUT AG-790
After adjusting 2TC2, readjust 2T1 at 600 kHz.
AM 1500 kHz 2TC2 Max.
AM 1720 kHz
AM 530 kHz
FM 108.0 MHz
Check
2T2 (RED)
Check
≦8.0V
DC 1.1±0.05V
DC 8.0±0.5V
2-2 TUNER SECTION

−5−
AC Voltmeter
FM Signal Generator
Stereo Signal Generator
Distortion Analyzer
D
E
G
F
AC Voltmeter
AM Signal Generator
B
C
AM Loop
Antenna
60cm
2T3
2T6
2T5
2T2
2T1
2T4
2L2
2L3
2TC2
2R19
2J2 TUNER PCB
+−
DC Voltmeter
A

3 EXPLODED VIEWS AND PARTS LIST
−6−

−7−
EXPLODED VIEW LIST
REF.NO. PARTSNO. DESCRIPTION REMARKS
1 9A09760000 TONEKEY 530503500
2 9A09759900 TUNINGKEY 530503300
3 9A09759800 FUNCTIONKEY 530503400
4 9A09760200 VOLUMEKNOB 530503600
5 9A09759700 DISPLAYLENS 510503800
6 9A09759600 PANEL 510503700
7 9A09760100 POWERKNOB 530503200
8£9A06602800 POWERSWITCH 180222501
9 9A09760300 SPKNOB 530503100
10 9A09758660 SPSELPCBASSY 037900303
11 9A09758160 HEADPHONEPCBASSY 037900405
12 9A09755060 FRONTPCBASSY 037900105
13 9A09760700 TOPCOVER 520505400
14 9A09760600 REARCOVER 520505300
15£9A06900600 CORDBUSHING 550011700
16£9A09580200 ACPOWERCORD 210183011
17 9A09759060 SPJACKPCBASSY 037900605
18 9A09752260 MAINPCBASSY 037900206
19 9A09756560 POWERPCBASSY 037900505
21 9A09760500 BOTTOMCOVER 520505200
22£9A09759500 POWERTRANSFORMER 159642022
23 9A09760900 HEATSINK 560502200
24 9A06901200 H/SBRACKET 540082800
25 9A06536400 LEG(GOLD) 540082601
26 9A09581500 RUBBERPAD 540503600
27 9A06536300 LEG(BLACK) 540082600
36 9A06900700 NAMEPLATE 510104300
37 9A09757660 TUNERPCBASSY 033700305
38 9A09760800 BRACKET 520505500
39 9A09591600 PCBSUPPORT 550505200
40 9A09760400 PCBSUPPORT 550505300
42£9A06602900 ACSOCKET 26CS18401
43 9A09758500 HEADPHONEJACKHOLDER 550505400
44£9A09759400 VOLTAGESWITCH 180222902
45 9A06904300 GNDTERMINAL,M3 320018601
46 9A09592000 SILICONRUBBER,T0‑3P2 322228370
INCLUDED ACCESSORIES
REF.NO. PARTSNO. DESCRIPTION REMARKS
9A09551200 OWNER'SMANUAL,EFSP 600520225
9A09763000 REMOTECONTROLUNIT,UR‑420 500079000
9A06902500 FMANT 59W360100
9A06902600 AMANT 59W360200

−8−
4 PC BOARDS AND PARTS LIST
MAIN PCB

−9−
SP JACK PCB
SP SEL PCB
HEADPHONE PCB
POWER PCB
FRONT PCB
TUNER PCB

MAIN PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09752260 MAINPCBASSY
9A09752300 MAINPCB
9A06896100 FUSECLIP
9A09754600 RCAJACK,RCA602
9A09754700 RCAJACK,RCA402
9A09754800 WAFER,3P
9A09754900 WAFER,5P
1C1£9A09586700 C,ELEC35V100UFM
1C4‑5£9A09586600 C,ELEC25V2200UFM
1C12£9A09586500 C,ELEC25V100UFM
1C14‑15£9A09752500 C,ELEC70V8200UFM
1D1‑8£9A09589300 DIODE,IN4004
1D9‑12£9A09753100 DIODE,6A10
1D13‑14 9A09589500 DIODE,IN4148
1D15‑18£9A09589300 DIODE,IN4004
1D19‑22 9A09589500 DIODE,IN4148
1D23 9A09589100 DIODE,ZENER24V1W
1FU1‑2£9A09753200 FUSE,6.3A250VSLOWBLOW
1FU3‑4£9A09753300 FUSE,2A250VSLOWBLOW
1N1£9A09590800 IC,L7812CV
1N2£9A09590900 IC,L7912CV
1N3£9A09590700 IC,L7805CV
1N4£9A09753400 IC,L7809CV
3D1 9A09588800 DIODE,ZENER6V81/2W
3N1 9A09753500 IC,TC9421
3N2 9A09590500 IC,TC4066BP
3V1‑2 9A09589600 TR,2SC1815GR
4N1 9A09590600 IC,JRC4560D
5N1 9A09590600 IC,JRC4560D
7C28£9A09587100 C,ELEC63V47UFM
7D1‑4 9A09589000 DIODE,ZENER24V1/2W
7D5‑6 9A09589500 DIODE,IN4148
7D7 9A09589200 DIODE,ZENER30V1/2W
7D8 9A09589500 DIODE,IN4148
7D9 9A09588900 DIODE,ZENER12V1/2W
7L1‑2 9A09591000 COIL,SPRING1.5UH
7R25‑28£9A06889900 R,1/2W3.3K
7R43‑46£9A09753600 R,CEMENT5WR33J
7R61‑62£9A09585400 R,2W6R1J
7R68£9A06889900 R,1/2W3.3K
7R70£9A07127500 R,2W47FMO
7R77‑78£9A09585500 R,2W10J
7V1‑4 9A09589700 TR,2N5551
7V5‑10 9A09589800 TR,2N5401
7V11‑14 9A09589700 TR,2N5551
7V15‑16 9A09753800 TR,2SD669A
7V17‑18 9A09753900 TR,2SB649A
7V19‑20£9A09754000 TR,2SC5200‑O
7V21‑22£9A09754100 TR,2SA1943‑O
7V23‑24 9A09589700 TR,2N5551
7V25 9A09589800 TR,2N5401
7V26‑29 9A09590100 TR,2SC8050D
7VR1‑2 9A09585700 VR,SEMI‑FIXED300J
RELA‑D 9A09591100 RELAY,12V5A
FRONT PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09755060 FRONTPCBASSY
9A09755100 FRONTPCB
9A09756400 VFDDISPLAY
8D1 9A09592400 DIODE,ZENER5V11/2W
8D2‑7 9A09589500 DIODE,IN4148
8G1 9A09592800 OSC,CRYSTAL4.433M
8IR1 9A09755300 INFRAREDRECEIVER,SM0038
8N1 9A09755400 IC,HT48R50A‑1
8N2 9A09755500 IC,PT6311
8N3 9A09592600 IC,HT24LC02
8V1 9A09755700 TR,2SA1015GR
8VR1 9A09755800 ENCODER,R162EC‑D1‑20F‑24C
LED1‑3 9A09755900 LED,M3RED
SW1‑16 9A09593100 SW,TACT
TUNER PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09757660 TUNERPCBASSY
9A09625000 TUNERPCB
9A09625100 TUNERSHIELDCASE
2D1‑2 9A09589500 DIODE,IN4148
2G1 9A09622100 FILTER,CERAMICL10.7MS2R
2G2 9A09622200 FILTER,CERAMICSFU450B
2G3 9A09622100 FILTER,CERAMICL10.7MS2R
2G4 9A09622300 OSC,CRYSTAL4.5MHZ
2L1 9A09622400 COIL,SPRING3.5TM4.5
2L2 9A09622500 COIL,SPRING4.5TM3.5
2L3 9A09622600 COIL,SPRING3.5TM3.5
2L4 9A09622700 INDUCTOR,AL0410102
2L5 9A09622800 INDUCTOR,AL0410221
2N1 9A09622900 IC,TA2149N
2N2 9A09623000 IC,TC9257F
2T1 9A09623800 IFT,AMRF10B(BLK)
2T2 9A09623900 IFT,AMOSC7B(RED)
2T3 9A09624000 IFT,AMIFT7B(WHT)
2T4 9A09624100 IFT,FMDET7B(PNK)
2T5‑6 9A09624200 IFT,MPX8B(BLK)
2TC2 9A09624300 SVC,CYM1‑2/7
2V1 9A09624400 FET,2SK161GR
2V2 9A09624700 TR,2SC9018H
2V3 9A09624600 TR,2SC9014C
2V4‑5 9A09589600 TR,2SC1815GR
2V8 9A09624700 TR,2SC9018H
2VD1‑2 9A09624800 DIODE,VARACTORV1043
2VD3‑4 9A09624900 DIODE,VARACTORV149B
2X1 9A07129000 ANTJACK
−10−

HEADPHONE PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09758160 HEADPHONEPCBASSY
9A09758200 HEADPHONEPCB
9A09758500 HEADPHONEJACKHOLDER
7D11‑12 9A09589500 DIODE,IN4148
7K1 9A06535000 HEADPHONEJACK
7R75‑76£9A09758300 R,2W470J
SP SEL PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09758660 SPSELPCBASSY
9A09758700 SPSELPCB
SWA‑B 9A09758800 SPSELECTORSW
SP JACK PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09759060 SPJACKPCBASSY
9A09759100 SPJACKPCB
9A09759200 SPJACK
POWER PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09756560 POWERPCBASSY
9A09756600 POWERPCB
9A06896100 FUSECLIP
C1‑3£9A09587200 C,275V0.01UFK
FU1£9A06534900 FUSE,2A125VSLOWBLOW
FU2£9A09753200 FUSE,6.3A250VSLOWBLOW
FU3£9A09756800 FUSE,3.15A250VSLOWBLOW
L1£9A09756700 COIL,TOROID
−11−

4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-790
MAIN PCB (1/2)
1 st Issue; March 2003
4C16
22
4C15
22
+9V
1I/O
1
1O/I
2
2O/I
3
2I/O
4
2C
5
3C
6
VSS
73I/O 8
3O/I 9 4O/I 10 4I/O 11
4C 12 1C 13
VDD 14
3N2
CD4066
1
2
3
4
1XS5
1 2 3
1XS6
3C34
104
3C32
152
3C28
103
3C26
473
3C38
4U7/50V
3C36
47U/16V
3C30 0.47U/50V
3C20
2U2/50V
SW-OUT 33
R-TO-I 32
T1 31 T2 30 T3 29
R-TO-O 28
R-VRIN 27
LD1 26 LD2 25
A-GND 24
VR-OUT 23
PVR-IN 22
R-FOUT 21
R-ROUT 20
VDD 19
STB 18
DATA 17
CK 16
GND 15
L-ROUT 14
L-FOUT 13
FVR-IN 12
VR-OUT
11
A-GND
10
LD2
9
LD1
8
L-VRIN
7
L-TO-O
6
T3
5
T2
4
T1
3
L-TO-I
2
SW-OUT
1
L-IN4
44
L-IN3
43
L-IN2
42
L-IN1
41
VSS
40
VREF
39
VCC
38
R-IN1
37
R-IN2
36
R-IN3
35
R-IN4
34
3N1
TC9421
+12
-12V -12V
3R23
470
3C11
2U2/50V
4R12
180K
4R4
390
4R18 100
4C20
47U/16V
4N1-2
4558D
4N1-1
4558D
5C6
47U/16V
5C5
47U/16V
5R10
100
5R9
100
5R8
47K
5R7
47K
5R2
1K
5R1
1K
3C1
471
3C2
471
3C3
471
3C4
471
3C6
471
3C7
471
3C8
471
3R8 1K
3R7 1K
3R6 1K
3R5 1K
3R4 1K
3R3 1K
3R2 1K
3R1 1K
4R14
1k
CD/L
PHONO/R
CD/R
PHONO/L
REC/L
AUX/L
AUX/R
TAPE/L
REC/R
TAPE/R
4R1
470
4R2
470
4R5
22K
4R6
22K
4C1
471
4C2
471
4C3
181
4C4
181
4C5
181
4C6
181
4C9
102
4C10
102
4C13
223
4C14
223
4C11
562
4C12
562
4R9 12K
4R10 12K
4R7
270
4R8
270
4C7
47U/16V
4C17
2U2/50V
4C18 2U2/50V
4C19
47U/16V
4C8
47U/16V
4R13
1k
5C3
101
5C4
101
3R9 47K
3R10 47K
3R11 47K
3R12 47K
3R13 47K
3R14 47K
5N1-1
4558D
5N1-2
4558D
4R17
100
4R3
390
4R11
180K
3C12
2U2/50V
3C14
2U2/50V
3C42
100U/16V
3C15
2U2/50V
3C47
100U/16V
3C46
104
+12
3C13
2U2/50V
3C16
2U2/50V
3C23
2U2/50V
3C24
2U2/50V
3C18
2U2/50V
3C41
47U
3C17
2U2/50V
3C19
2U2/50V
3R16
1k 3R15
1k
3R19
1K
3R20
1K
3R18
2K2
3R21
100
4R15
33K
4R16
33K
3C43
104
1 2 3
1XS1
3V2
2SC2878
3V1
2SC2878
3R17
2K2
5R3
47k
5R4
47k
5R6
15k
5R5
15k
3C29
0.47U/50V 3C35
47U/16V
3C37
4U7/50V
3C39
4U7/50V
3C40
4U7/50V
5C1
47U/16V
5C2
47U/16V
3C25
473
3C27
103
3C31
152 3C33
104
3C21
2U2/50V
3C22
2U2/50V
MUTE
TAPE
/TAPE
6
5
7
4
1
2
3
8
1
3
2
4
5
6
7
8
TUNER IN
RL
3R22
100
+9V
3C44
100U/16V
3C45
104
3C5
471
3R24
22k 3R25 22K
3D1
6V8
3R28 100K
3R26
100K
3R27 100K
3R30
100K 3R29 100K
3R31 100K
3R33
100K
3R32 100K
3R34 100K
3R36 100K
3R35
100K
3R37
100K
3R39
47K
3R38
47K
L-1
R-1
AM/FM Stereo Receiver
AAGG--779900

4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-790
MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, SP JACK PCB, POWER PCB
7C31
10P
7C30
10P
S2
7R78
10/2W
7R77
10/2W
7V25
5401
S1
POWER SW
C1
103/250V
FU2
6.3A/250V
1C15 6800U/70V
1R3 15K
1C14 6800U/70V
1R2
15K
1D10
1N5404
1D11
1N5404
1D12
1N5404
1D9
1N5404
7C22
104
7C28 47U/63V
1D15 4004
1D18 4004
1D14
4148
7R69
10K
7R70 100
7R73
47K
7R74 47K
1C13
10U/63V
1R5 22K
7C27
220U/16V
7C26
220U/16V
1D13 4148
7R72
10K
7C25
4U7/63V
7C23
102
7R63
56K
7R59
22K
7V29
8050D
7V28
8050D
7V27
8050D
7V26
8050D
7C21 104
7R62 5.1/2W
7R60 22K 7R61 5.1/2W 7R71 10K
7C17
47U/25V
7R51
1K
7R15
22K
7R19
100
7R17
100
7V1
5551
7R1
1K
7C1 4U7/50V
7R5
3K3
7R7
3K3
7R25
3K3/0.5W
7R29
220
7C5 47U/63V
7V3
5551
7R9
100
7R11
100
7R13
22K
7V9
5401
7V15
669A
7V19
5200
7V21
1943
7V17
649A
7V13
5551
7V11
5551
7V5
5401
7V7
5401
7C9
104
7C13
30P
7R31
3K3
7R33
1K5
7VR1
300
7C15
30P
7R35 220
7R21
3K3 7R23
3K3
7C7
47U/63V
7C11
104
7R27 3K3/0.5W
7R49
33K
7R37
220
7R39
33
7R43
0.33/5W
7R45
0.33/5W
7R47
100
7R41
100
7V23
5551
7R53 3K3 7R55 27K
7C19
4U7/50V
7L1
1.5uH
7L2
1.5uH
7C20
4U7/50V
7R56 27K 7R54 3K3
7V24
5551
7R42
100
7R48
100
7R46
0.33/5W
7R44
0.33/5W
7R40
33
7R38
220
7R50
33K
7R28 3K3/0.5W
7C12
104
7C8
47U/63V
7R24
3K3
7R22
3K3
7R36 220
7C16
30P
7VR2
300
7R34
1K5
7R32
3K3
7C14
30P
7C10
104
7V8
5401
7V6
5401
7V12
5551
7V14
5551
7V18
649A
7V22
1943
7V20
5200
7V16
669A
7V10
5401
7R14
22K
7R12
100
7R10
100
7V4
5551
7C6 47U/63V
7R30
220
7R26
3K3/0.5W
7R8
3K3
7R6
3K3
7C2 4U7/50V
7R2
1K
7V2
5551
7R18
100
7R20
100
7R16
22K
7R52
1K
7C18
47U/25V
7R4
33K
7C4 100P 7C3 100P
7R3
33K
7C24
10U/63V
7R67
2K7
7R68 3K3/1W
7R64 510K
7D8
4148
7R65
220K
7R66 4K7
1XS1
1XS2
1D3
1N4004
1D4
1N4004
1D2
1N4004
1D1
1N4004
1C1
100U/35V
1R1
100
1XS3
1D5
1N4004
1D8
1N4004
1D6
1N4004 1D7 1N4004
1C4 2200U/25V 1C5 2200U/25V
1N3
78M05
1N1
7812
1N2
7912
1C10 1000U/16V
1C11 1000U/16V
1C3 470U/16V
1D16 4004
1D17 4004
1R4 2K2
1C12 100U/25V
RELD
1FU1
6.3A/250V
1FU2
6.3A/250V
7D7
30V
7D1
24V
7D3 24V
7D2
24V
7D4 24V
7D10
12V
7R57
18K
7D5
4148
7D6
4148
7R58
18K
1
2
1XP12
1
2
1XP13
+12
-12V
AC 120V/230V
SEL.SW
VOLTAGE
+5V
G
1
2
3
1XP7
1
2
3
1XS7
SWB SWA
RELA
RELB
1
8
7
3
2
4
57K1
7R75 680
7R76 680
1X1
Speakers out
7C29
103
RELC
ON
OFF
ON
OFF
7D11
4148
7D12
4148
R
L
G
LR
1 2 3 4
1XS8
B C A V
1 2 3 4
1XP8
V A C B
OFF OFF OFF ONONON
R
L
G
1 2 3 4 5 6 7
1XS9
1 2 3 4 5 6 7
1XP9
AL+ AR+ BL+ BR+ AL- AR-
G
AL+ BL+ AR+ BR+ AL- BL- AR- BR- AL+
AR+ BL+ BR+ AL- AR-
G
LR RL
L1-1
L1-2
C3
103/250V C2
103/250V
AC JACK OUT
FU3 3.15A/250V
1N4
7809
+9
+12V
G
1 2 3 4 5 6 7
1XS4
POW
2.1V -24V 0V 2.1V
DGND
+5V
1D19 1N4148
1D20 1N4148
1D22 1N4148
1D21 1N4148
1C18 100U/16V 1C19 220U/16V
1FU3 2A/250V
1FU4 2A/250V
RL
FU1
2.5A/250V
1D23
24V/1W
R-1L-1
1 st Issue; March 2003
AM/FM Stereo Receiver
AAGG--779900

4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-790
TUNER PCB
1 2 3 4
1XS14
2L3 3.5T
2L2 4.5T
2X1
2T5
2C5
152
*2R12 1K
2C37 100U/10V
2C28
203
2L4
102
2C20
203
2D1
IN4148
2L5
221
2C43
203
2C38
100U/10V
1 2
1XS13
2C45
203
2C24
102
2R20
2K
2R21 2K
2R22 2K
2G4
4.5M 2R23
2K4
2C41
30
2C42
30
2C44
103
2R17
1K
2C40
3U3/50V
2V5
C1815GR
2V4 C1815GR
2C46
203
2C47 100U/16V
2C39 47U/16V
2R18 1K
2R19
8K2
1 2 3
1XS10
1 2
1XS12
XT
1
XTN
2
PERIOD
3
CLOCK
4
DATA
5
OT-1
6
OT-2
7
OT-3
8
OT-4
9
I/O-5
10 I/O-6 11
VDD 12
AMIN 13
FMIN 14
GND 15
IFIN2 16
I/O-8 17
I/O-7 18
DO1 19
DO2 20
2N2
TC9257F
2C16 203
*2TC1
2/7
2VD1
V104
2VD3
V149B
2C26 104
2C27
104
2R11 3K3
2C36
1U/50V
2R13
3K3
2C35
4U7/50V
2C19
102
2C22
102
2C23
102
2C21
102
2R15
300K
2R14
2K
2R9
100K
2C10 501
2C15
203
2C9
20
2R10
8K2
2R6 100K
2C13 203
2C4
*7
2C6
152
2R3 3K3
2R5
3K3
2C12
203
2C8
152
2C25
104
2R4
100
2R8
100K
2C14
203
2R7
100K
2C7 152
2R16
22K
2C34 220U/10V
2C33
4U7/50V
2C32
4U7/50V
2C17
682
2C18 682
2C31
22U/16V
2G1 L10.7M
2G2 450B
2R1 330
2C29 U1/50V
2C3
30
2C2
33
2C1
30
2L1 3.5T
2R2 330
2T3
2T2
2C11
103
2VD2 V104
2V1
K161GR
2TC2
2/7 2T1
2VD4
V149B
2V3
9014C
2V2 9018H
RFGND
1
RFIN
2
AMLCUT
3
MIXOUT
4
VCC
5
AMIF
6
FMIF
7
GND
8
AGC
9
QUOD
10
ROUT
11
LOUT
12 LPF2 13
LPF1 14
DETIN 15
DETO 16
IFREQ 17
ST 18
OSCO 19
AMOSC 20
FMOSC 21
AMRF 22
RFVCC 23
FMRF 24
2N1
TA2149N
2C51
153
2C49
153
2C48
153
2C50
153
2T4
2C52
203
LOOP75
FM AM
R G L
+12V G
+5V G
DATA CLOCK PERIOD ST
2C53 18
2T2
2G3 L10.7M
2V9
9018H
2R29 300K
2R30 330
2R31 330
2C54
22
2R32 15
2D2 IN4148
2C55
47
1 st Issue; March 2003
AM/FM Stereo Receiver
AAGG--779900

4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-790
FRONT PCB
INSTRUCTIONS FOR SERVICE PERSONNEL
BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE-
CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT.
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14
15
16
17
18
19
20
21
22
23
24
25
26
27 28 29 30 31 32 33 34 35 36 37 38 39
40
41
42
43
44
45
46
47
48
49
50
51
52
1234567891011121314151617181920212223242526272829303132333435363738394041
8R27
56k
OSC
LED1
STANDBY
LED3
LOUDNESS
LED2
MUTING
8R2
560
8R28
560
8R29
560
G1
G2
G3
G4
G5
G6G7G8G9G10G11
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
KEY1KEY2KEY3KEY4
VDD
VDD
VDD
2.1V
2.1V
+5V
-24V
VEE
VSS
LED1
LED2
LED3
LED4
LED5
STB CLK IC DIN DOUT
SW4
BAND
SW5
FM MODE
SW6
MEMORY
SW7
AUX
SW8
TAPE M
SW3
UP
SW2
DOWN
SW1
TUNING MODE
SW13
LOUDNESS
SW11
CD
SW10
PHONO
SW9
TUNER
SW12
SLEEP
SW14
BASS
SW16
BALANCE
SW15
TREBLE
8D3
1N4148
8D4
1N4148
8D5
1N4148
8D6
1N4148
8D7
1N4148
8R21 10K
8R22 10K
+5V
POW
DGND
0V
8R1
10K
8C2
100U/25V
8C3
100U/35V
8D2
1N4148
8C1
470U/16V
8R26 10K 8R25 10K 8R24 10K 8R23 10K
V F D
8C6
104
S13 S14 S15 S16
1
2
3
4
5
6
7
8
9
10
11
12
13
14 15
16
17
18
19
20
21
22
23
24
25
26
27
28
+5V
8C4
10U/16V
REMOTE
VOLUME
+5V
8R20
10K
8C8
30
8C7
30
+5V
8R19 100k
8C5
104
8G1
4.433MHz
1
2
3
45
6
7
8
DATA
CLOCK
PERIOD
ST LED
STB
DATA
CK
TAPE
MUTE
PA1
PA2
PA3 PA4
PA5
PA6
PA7PA0
PB0
PB1
PB2
PB3
PB4
PB5 PB6
PB7
PC0
PC1 PC2
PC3
PC4
PC5VSS
INT
RES
VDD
OSC1
OSC2
SDA
SCL
24C02
8R17 1k
8R16 1k
8R15 1k
8R14 1k
8R13 1k
8R12 1k
8R11 1k
8R10 1k
8R8 1k
8R7 1k
1
2
3
8R3
330
8R4
10K
8R5
10K
37
36
35
34
33
323130292827
45
44
43
42
41
40
39
34
35
38
37
36
30313233
8
9
6
5
/TAPE
8V1
2SA1015
8R18
10K
1
2
3
4
5
6
7
1XP4
8TR1
5
6
7
8
9
8N1
8N2
8N3
8VR1
1
2
3
4
1XP14
1
2
3
1XP5
1
2
3
1XP6
SENSOR
HT48R50A-1
PT6311
8D1
5V1
8R31
2R2
8R30
2R2
8R32 3k9
8R33
100
8C9
104
1 st Issue; March 2003
AM/FM Stereo Receiver
AAGG--779900
NOTES:
£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.