Teac AG-370 User manual
AAGG--337700
SERVICE MANUAL
AM/FM Stereo Receiver
Effective : April, 2003 S-0091A
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 .... 50 + 50 watts RMS (0.9 % THD, 1 kHz, 8 ohms)
Total Harmonic Distortion.................... 0.05 % (at 45 watts,1 kHz)
Input Sensitivity/Impedance .................. PHONO: 4 mV/22 kohms
LINE: 270 mV/20 kohms
Frequency Response.................... PHONO: 20 Hz–20 kHz, +/–3 dB
LINE: 20 Hz–30 kHz, +1/–3 dB
Signal-to-Noise Ratio.............................................. PHONO: 60 dB
LINE: 68 dB
Tone Control .......................................... BASS: +/–9 dB at 100 Hz
TREBLE: +/–7 dB at 10 kHz
Loudness Control (Volume at –40 dB Position)..............................
+7 dB at 100 Hz, +5 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 .......................... 520 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
General
Power Requirements.................................. 120 V/230 V, 50-60 Hz
Power Consumption ............................................................ 120 W
AC Outlet .......................... Unswitched x 1, 100 W max (1 A max)
Dimensions (W x H x D) ........................ 17-1/8" x 5-1/8" x 12-5/8"
(435 x 130 x 320 mm)
Weight (net) .................................................. 15-7/16 lbs (7.0 kg)
Standard Accessories .................................. AM Loop Antenna x 1
FM ”T” Type Antenna 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 7VR1 (Lch) so that the voltage
becomes 3.3±1.3mV.
4. Adjust 7VR2 (Rch) in the same way.
7VR17VR2
7R46 7R44 7R45 7R43
0.33/5W 0.33/5W 0.33/5W 0.33/5W
MAIN PCB
DC voltmeter DC voltmeter
−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-370
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−
1
2
34
5
6
7
8
9
q
w
e
r
t
y
u
i
o
p
a
s
d
f
g
h
j
k
l
;
z
x
c
v
b
n
m
,
.
/
!
@
#
$
−7−
EXPLODED VIEW LIST
REF.NO. PARTSNO. DESCRIPTION REMARKS
1 9A06536200 MASTERVRKNOB 53W360900
2 9A06900300 INDICATOR 510104200
3 9A09581400 TONECONTROLKNOB 530503000
4 9A09580800 DISPLAYLENS 510503600
5 9A09580700 PANEL 510503500
6 9A09580900 FUNCTIONKEY 530502500
7 9A09581200 MEMORYKEY 530502600
8 9A09581000 BANDKEY 530502900
9 9A09592000 SILICONRUBBER,T0‑3P2 322228370
10‑1£9A09590200 TR,2SD1047E 230104705
10‑2£9A09590300 TR,2SB817E 230817005
11 9A09581100 TUNINGKEY 530502800
12 9A06536000 LOUDKNOB 53W360700
13 9A09581300 AUTO/MANUALKEY 530502700
14 9A09592900 VFDDISPLAY 250370000
15 9A09579810 HEADPHONOPCBASSY 033700601
16 9A09579910 SELECTPCBASSY 033700401
17 9A07063400 SPEAKERSWITCHKNOB 53W361000
18 9A09580010 SELECTPCBASSY 033700501
19£9A06602800 POWERSWITCH 180222501
20 9A06535900 POWERKNOB 530049400
21 9A09579410 CONTROLPCBASSY 033700201
22 9A06536400 LEG(GOLD) 540082601
23 9A06536300 LEG(BLACK) 540082600
24 9A09581600 BOTTOMCOVER 520504800
25 9A06901000 SIDEBRACKET(L) 52W360300
26 9A09581800 SIDEBRACKET(R) 520505100
27 9A09581900 TOPCOVER 520505000
28 9A09579310 MAINPCBASSY 033700101
29 9A09591800 HEATSINK(A) 560502100
30 9A06901200 H/SBRACKET 540082800
31 9A09581700 REARCOVER 520504900
32£9A09580100 POWERTRANSFORMER 157631522
33 9A06904300 GNDTERMINAL,M3 320018601
34£9A06900600 CORDBUSHING 550011700
35£9A06602900 ACSOCKET 26CS18401
36 9A07064400 SPACERSUPPORT 550098819
37 9A09579510 TUNERPCBASSY 033700301
38 9A09591700 CABLECLIP 550505500
39 9A09591600 PCBSUPPORT 550505200
40 9A06900700 NAMEPLATE 510104300
41£9A09580200 ACPOWERCORD 210183011
42 9A09579610 POWERSOCKETPCBASSY 033700701
43 9A09579710 POWERSELECTSWPCBASSY 033700801
44£9A09587200 C,275V0.01UF 136M103M2
INCLUDED ACCESSORIES
REF.NO. PARTSNO. DESCRIPTION REMARKS
9A09471700 OWNER'SMANUAL,EFSP 600520205
9A06902500 FMANT 59W360100
9A06902600 AMANT 59W360200
−8−
4 PC BOARDS AND PARTS LIST
MAIN PCB
−9−
SP SEL PCB SP SEL PCB HEADPHONE PCB POW SEL PCB POWER PCB
FRONT PCB TUNER PCB
MAIN PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579310 MAINPCBASSY
9A09592100 MAINPCB
9A06534100 SPJACK
9A06534200 RCAJACK,6P
9A06534300 RCAJACK,4P
9A06896100 FUSECLIP
9A06897300 LEADPIN,3P
9A06901200 H/SBRACKET
9A09591600 PCBSUPPORT
9A09591700 CABLECLIP
9A09591800 HEATSINK(A)
9A09591900 HEATSINK(B)
9A09592000 SILICONRUBBER,T0‑3P2
1C1£9A09586700 C,ELEC35V100UFM
1C4‑5£9A09586600 C,ELEC25V2200UFM
1C12£9A09586500 C,ELEC25V100UFM
1C14‑15£9A09587000 C,ELEC58V6800UFM
1D1‑8£9A09589300 DIODE,IN4004
1D9‑12£9A09589400 DIODE,IN5404
1D13‑14 9A09589500 DIODE,IN4148
1D15‑18£9A09589300 DIODE,IN4004
1D19 9A09589100 DIODE,ZENER24V1W
1FU1‑2£9A09591200 FUSE,5A250VSLOWBLOW
1N1£9A09590800 IC,L7812CV
1N2£9A09590900 IC,L7912CV
1N3£9A09590700 IC,L7805CV
3D1‑2 9A09588800 DIODE,ZENER6V81/2W
3N1 9A09590400 IC,TC4052BP
3N2 9A09590500 IC,TC4066BP
3V1‑3 9A09589600 TR,2SC1815GR
4N1 9A09590600 IC,4560D
5N1 9A09590600 IC,4560D
6N1 9A09590600 IC,4560D
7C28£9A09587100 C,ELEC63V47UFM
7D1‑4 9A09589000 DIODE,ZENER24V1/2W
7D5‑6 9A09589500 DIODE,IN4148
7D7 9A09589200 DIODE,ZENER30V1/2W
7D8 9A09589500 DIODE,IN4148
7D9 9A09588900 DIODE,ZENER12V1/2W
7L1‑2 9A09591000 COIL,SPRING1.5UH
7R43‑46£9A09585600 R,CEMENT5WR33J
7R61‑62£9A09585400 R,2W6R1J
7R70£9A09585300 R,0.5W100J
7R77‑78£9A09585500 R,2W10J
7V1‑4 9A09589700 TR,2N5551
7V5‑10 9A09589800 TR,2N5401
7V11‑14 9A09589700 TR,2N5551
7V15‑16 9A09589900 TR,3DA4381
7V17‑18 9A09590000 TR,3CA1667
7V19‑20£9A09590200 TR,2SD1047E
7V21‑22£9A09590300 TR,2SB817E
7V23‑24 9A09589700 TR,2N5551
7V25 9A09589800 TR,2N5401
7V26‑29 9A09590100 TR,2SC8050D
7VR1‑2 9A09585700 VR,SEMI‑FIXED300J
REL1 9A09591100 RELAY,12V5A
CONTROL PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579410 CONTROLPCBASSY
9A09593800 FRONTPCB
9A09592900 VFDDISPLAY
9A09593900 VFDSHIELDCASE
6S1 9A09593000 SW,LOUDNESS
6VR1‑2 9A06534400 VR,100KBX2
6VR3 9A06604000 VR,50KAX2
6VR4 9A06534500 VR,100KW
8D1 9A09589500 DIODE,IN4148
8D2 9A09592400 DIODE,ZENER5V11/2W
8D3‑8 9A09589500 DIODE,IN4148
8G1 9A09592800 OSC,CRYSTAL4.433M
8N1 9A09592500 IC,HT48R50A‑1
8N2 9A09592600 IC,HT24LC02
8N3 9A09592700 IC,PT6312LQ
SW1‑20 9A09593100 SW,TACT
TUNER PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579510 TUNERPCBASSY
9A09625000 TUNERPCB
9A09625100 TUNERSHIELDCASE
2D1‑2 9A09589500 DIODE,IN4148
2G1 9A09622100 FILTER,CERAMICL10.7MS2R
2G2 9A09622200 FILTER,CERAMICSFU450B
2G3 9A09622100 FILTER,CERAMICL10.7MS2R
2G4 9A09622300 OSC,CRYSTAL4.5MHZ
2L1 9A09622400 COIL,SPRING3.5TM4.5
2L2 9A09622500 COIL,SPRING4.5TM3.5
2L3 9A09622600 COIL,SPRING3.5TM3.5
2L4 9A09622700 INDUCTOR,AL0410102
2L5 9A09622800 INDUCTOR,AL0410221
2N1 9A09622900 IC,TA2149N
2N2 9A09623000 IC,TC9257F
2T1 9A09623800 IFT,AMRF10B(BLK)
2T2 9A09623900 IFT,AMOSC7B(RED)
2T3 9A09624000 IFT,AMIFT7B(WHT)
2T4 9A09624100 IFT,FMDET7B(PNK)
2T5‑6 9A09624200 IFT,MPX8B(BLK)
2TC2 9A09624300 SVC,CYM1‑2/7
2V1 9A09624400 FET,2SK161GR
2V2 9A09624500 TR,2SC9018I
2V3 9A09624600 TR,2SC9014C
2V4‑5 9A09589600 TR,2SC1815GR
2V6‑7 9A09624600 TR,2SC9014C
2V8 9A09624700 TR,2SC9018H
2VD1‑2 9A09624800 DIODE,VARACTORV1043
2VD3‑4 9A09624900 DIODE,VARACTORV149B
2X1 9A07129000 ANTJACK
−10−
SELECT PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579910 SELECTPCBASSY
9A09626300 SPSELPCB
2S1 9A09625800 SPSELECTORSW
SELECT PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09580010 SELECTPCBASSY
9A09626400 SPSELPCB
2S2 9A09625800 SPSELECTORSW
HEADPHONE PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579810 HEADPHONEPCBASSY
9A09625700 HEADPHONEPCB
9A06901600 H/PJACKHOLDER
7D11‑12 9A09589500 DIODE,IN4148
7K1 9A06535000 HEADPHONEJACK
7R75‑76£9A06889700 R,1/2W330
POWER SELECT SW PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579710 POWERSELECTSWPCBASSY
9A09625400 POWSELPCB
£9A07069700 POWERCHANGESWITCH
POWER SOCKET PCB ASSY
REF.NO. PARTSNO. DESCRIPTION
9A09579610 POWERSOCKETPCBASSY
9A09625300 POWERPCB
£9A06602900 ACSOCKET
9A06896100 FUSECLIP
FU1£9A09625200 FUSE,2.5A250VSLOWBLOW
−11−
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
MAIN PCB (1/2)
1 st Issue; January 2003
1
2
3
4
5
6
1XS1
6VR4
100K
+12
-12V
-12V
+12+12
-12V
-12V
+12
4C18
220
4C17
220
4R16
100K
4R15
100K
3D2
6V8
3D1
6V8
1I/O 1
1O/I 2
2O/I 3
2I/O 4
2C 5
3C 6
VSS 7
3I/O
8
3O/I
9
4O/I
10
4I/O
11
4C
12
1C
13
VDD
14
3N2 CD4066
4R12
180K
4R4
390
6C1
4U7/50V
6N1-2
4558D
6N1-1
4558D
6C16
104
6C15
104
6C14
102
6C13
102
6C6
820
6C5
820
6C8
47
6C7
47
6C4
153
6C3
153
6C12
4U7/50V
6C11
4U7/50V
6C10 100U/16V
6C9 100U/16V
6C2
4U7/50V
6R24
100
6R13
1K
6R14
1K
6R7
1K
6R8
1K
6R1 10K
6R2 10K
6R9 15K
6R10 15K
6R5
10K
6R6
10K
6R3 33K
6R4 33K
6R11
33K
6R12
33K
6R15
1K
6R16
1K
6R17
5K6
6R18
5K6
6R19
5K6
6R20
5K6
6R22
1K
6R21
1K
4R18 100
4C20
100U/16V
4N1-2
4558D
4N1-1
4558D
5C2
4U7/50V
5C1
4U7/50V
5C8
100U/16V
5C7
100U/16V
5R14
1K
5R13
1K
5R12
100
5R11
100
5R10
33K
5R9
33K
5R8
15K
5R7
15K
5R6
100K
5R5
100K
5R4
47K
5R3
47K
5R2
1K
5R1
1K
3C1
471
3C2
471
3C3
471
3C4
471
3C5
471
3C6
471
3C9
22
3C10
22
3C7
471
3C8
471
3R8
1K
3R7 1K
3R6 3K9
3R5 3K9
3R4 3K9
3R3 3K9
3R2 3K9
3R1
3K9
4R14
1K
3C12
104
3C11
104
3V1
C1815
3V3
C1815
3V2
C1815
CD/L
PHONO
CD/R
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
4C15
4U7
4C16
4U7
4C19
100U/16V
4C8
47U/16V
4R13
1K
5C3
22U/16V
5C4
22U/16V
3R20
100K
3R9
33K
3R10
33K
3R11
33K
3R12
33K
3R13
33K
3R14
33K
3R17 10K
3R18 10K
3R19
10K
5N1-1
4558D
5N1-2
4558D
6R23
100
4R17
100
4R3
390
4R11
180K
Y0 1
Y2 2
Y3
Y3 4
Y1 5
S6
VEE 7
VSS 8
A1
9
A0
10
X3
11
X0
12
X
13
X1
14
X2
15
VDD
16
3N1
CD4052
1
2
3
1XS6
3R21 33K
3R22 33K
3R15
100
3R16 100
1
2
3
1XP10
1
2
3
1XS3
1
2
3
1XP3
6S1
6VR3
50KB
1
2
3
1XP4
6VR1-1
100KB
6VR1-2
100KB
6VR2-1
100KB
6VR2-2
100KB
6VR1
6VR2
1
2
3
4
5
6
1XS2
R
G
L
4
3
2
4
3
2
5
6
1
5
6
1
RGL
6
41
7
3
2
5
L
G
R
BASS
TREBLE
BASS
TREBLE
8
7
6
5
4
3
2
1
6
5
7
4
R
1
2
3
8
1
3
2
4
5
6
7
8
TAPE
SW1
SW2
LGR
BASS
TREBLE
AND 1XP2
AND 1XP1
TO TUNER
AM/FM Stereo Receiver
AAGG--337700
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, POWER PCB, POW SEL PCB
7C31
10P
7C30
10P
S2
7R78
10/2W
7R77
10/2W
1
2
1XS10
1
2
1XP10
1
2
3
1XP9
1
2
3
1XS9
1
2
3
4
5
1XP8
1
2
3
4
5
1XS8
1
2
3
4
5
1XP5
1
2
3
4
5
1XS5
1
2
3
1XS7
2S2
SPB
1X1
SPECKER
7V25
5401
S1
POWER SW
C1
103/250V
FU1
2.5A/250V
1C15
6800U/50V
1R3 15K
1C14
6800U/50V
1C16 104
1C17 104
1R2 15K
1D10
5404
1D11
5404
1D12
5404
1D9
5404
7C22
104
7C28
33U/50V
1D15 4004
1D18 4004
1D14
4148
7R69
10K
7R70
100
7R73
47K
7R74 47K
1C13
10U/50V
1R5 22K
7C27
220U/16V
7C26
220U/16V
1D13 4148
7R72
10K
7C25
4U7/50V
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
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
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
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
7R8
3K3
7R6
3K3
7C2
4U7/50V
7R2
1K
7V2
5551
7R18
100
7R20
100
7R16
22K
7R52
1K
7C18
47U/25V
7R4
100K
7C4 100P 7C3 100P
7R3
100K
7C24
10U/50V
7R67
2K7
7R68 3K3/1W
7R64
220K
7D8
4148
7R65
220K
7R66 4K7
1XP15
1XP17
1D1
4004
1D2
4004
1D3
4004
1D4
4004
1C1 100U/35V
1C2
104
1R1
100
1XP16
1D5
4004
1D6
4004
1D7
4004
1D8
4004
1C4
2200U/25V
1C5
2200U/25V
1C6 104
1C7 104
1N3
78M05
1N1
7812
1N2
7912
1C8
104
1C9 104
1C10
1000U/16V
1C11
1000U/16V
1C3 470U/16V
1D16 4004
1D17 4004
1R4
2K2
1C12 100U/25V
REL1
1FU1
5A/250V
1FU2
5A/250V
1
8
7
3
2
4
57K1
7R75 330
7R76 330
1
2
3
1XS4
2S1
SPA
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
7D11
4148
7D12
4148
7C29
103/50V
1D19 24V
1
2
3
4
5
6
1XS11
1C18
100U/35V
1R6 100
B/R-
B/L-
G
A/R-
A/L-
R
R
G
L
L
RRGL
AC 120V/230V
SEL.SW
VOLTAGE
DGND
SPA
SPB
-24V
0V AC
2.5V
2.5V
DGND
+5V
L
A/L-
A/R-
A/L+
A/R+
B/L+
B/L-
B/R+
B/R-
LGR
A/L-
A/R-
G
B/L-
B/R-
DG
SPBSPB
DG
B/L-
G
B/R-
+5V
G
G
+12V
1 st Issue; January 2003
AM/FM Stereo Receiver
AAGG--337700
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
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
2C30
100U/10V
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 471
2C15
203
2C9
15
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 9018I
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
2V6
9014C
2V7
9014C
2R24
100
2R27
1K5
2R28
1K5
2C53 18
2T2
2R25
510
2R26
510
2G3
L10.7M
2V8
9018H
2R29 300K
2R30 330
2R31 330
2C54
22
2R32 *24
2D2 IN4148
2C55
47
1 st Issue; January 2003
AM/FM Stereo Receiver
AAGG--337700
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14 PC1
PC0/TM0
PG0/INT
VSS
PB0/BZ
PB1/BZ
PB2
PB3
PA0
PA1
PA2
PA3
PB4
PB5 PB6
PB7
PA4
PA5
PA6
PA7
OSC2/PG2
OSC1/PG1
VDD
RES
PC5/TM1
PC4
PC3
PC2 15
16
17
18
19
20
21
22
23
24
25
26
27
28
8G1 4.00M
30P
30P
+5V
HT24LC02
5
6
+5V
100K
104 104
DIN
STB
CLK
DOUT
SDA
SCL
SPA
SPB
ST LED
PERIOD
CLOCK
DATA
SW2
SW1
TAPE
10K 10k 10k 10k 10k
+5V
1N4148
1N4148
1N4148
1N4148
1N4148
1N4148
10K
10K
8R15
56K
+5V
8R5
10K
8R1
10K
+5V
4PHONO
TAPE MO~ 3
65
VIDEO/AUX 2
FM MODE AM
1 FM1/2
TUNER 7
CD 8
AUTO/~ MEMORY
DOWNUP
3
4
5
6
2
1
-24V
+5V
+5V
1N4148
8C1
470U/16
8C3
100U/16
8D2
5.1V
8C2
104
8R2
10K
8C4
10uF/25
-24V
1
2
3
1XP7
1
2
3
1XP6
1XP14
1
2
3
4
8C10
104
GND
8D3
8D4
8D5
8D6
8D7
8D8
8R4 8R3 8R18 8R198R14
8N2
8C9
104
8C5
8C6
8R13
8C8
8C7
8D1
8R16
8R17
8N1
HT48R50A-1
8N3
+5V
8R20
1.2
8R21
1.2
12398765410111213 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 33 34 35
DGND
1.8V AC
1.8V AC
0V AC
SKEY 6
SKEY 5
SKEY 4
SKEY 3
SKEY 2
SKEY 1
KEY 1KEY 2KEY 3KEY 4
PA6
PA7
VFD 25114-1
1
2
3
4
5
6
7
8
9
10
11
33
32
31
30
29
28
27
26
25
24
23
12 13 14 15 16 17 18 19 20 21 22
44 43 42 41 40 39 38 37 36 35 34
PA3
PA4
PB7
PB6
PT6312
PB5
PB4
PA3
PA2
PB3
PB2
PB1
PC1
PC2
1 st Issue; January 2003
AM/FM Stereo Receiver
AAGG--337700
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.
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
MAIN PCB (1/2)
1 st Issue; January 2003
1
2
3
4
5
6
1XS1
6VR4
100K
+12
-12V
-12V
+12+12
-12V
-12V
+12
4C18
220
4C17
220
4R16
100K
4R15
100K
3D2
6V8
3D1
6V8
1I/O 1
1O/I 2
2O/I 3
2I/O 4
2C 5
3C 6
VSS 7
3I/O
8
3O/I
9
4O/I
10
4I/O
11
4C
12
1C
13
VDD
14
3N2 CD4066
4R12
180K
4R4
390
6C1
4U7/50V
6N1-2
4558D
6N1-1
4558D
6C16
104
6C15
104
6C14
102
6C13
102
6C6
820
6C5
820
6C8
47
6C7
47
6C4
153
6C3
153
6C12
4U7/50V
6C11
4U7/50V
6C10 100U/16V
6C9 100U/16V
6C2
4U7/50V
6R24
100
6R13
1K
6R14
1K
6R7
1K
6R8
1K
6R1 10K
6R2 10K
6R9 15K
6R10 15K
6R5
10K
6R6
10K
6R3 33K
6R4 33K
6R11
33K
6R12
33K
6R15
1K
6R16
1K
6R17
5K6
6R18
5K6
6R19
5K6
6R20
5K6
6R22
1K
6R21
1K
4R18 100
4C20
100U/16V
4N1-2
4558D
4N1-1
4558D
5C2
4U7/50V
5C1
4U7/50V
5C8
100U/16V
5C7
100U/16V
5R14
1K
5R13
1K
5R12
100
5R11
100
5R10
33K
5R9
33K
5R8
15K
5R7
15K
5R6
100K
5R5
100K
5R4
47K
5R3
47K
5R2
1K
5R1
1K
3C1
471
3C2
471
3C3
471
3C4
471
3C5
471
3C6
471
3C9
22
3C10
22
3C7
471
3C8
471
3R8
1K
3R7 1K
3R6 3K9
3R5 3K9
3R4 3K9
3R3 3K9
3R2 3K9
3R1
3K9
4R14
1K
3C12
104
3C11
104
3V1
C1815
3V3
C1815
3V2
C1815
CD/L
PHONO
CD/R
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
4C15
4U7
4C16
4U7
4C19
100U/16V
4C8
47U/16V
4R13
1K
5C3
22U/16V
5C4
22U/16V
3R20
100K
3R9
33K
3R10
33K
3R11
33K
3R12
33K
3R13
33K
3R14
33K
3R17 10K
3R18 10K
3R19
10K
5N1-1
4558D
5N1-2
4558D
6R23
100
4R17
100
4R3
390
4R11
180K
Y0 1
Y2 2
Y3
Y3 4
Y1 5
S6
VEE 7
VSS 8
A1
9
A0
10
X3
11
X0
12
X
13
X1
14
X2
15
VDD
16
3N1
CD4052
1
2
3
1XS6
3R21 33K
3R22 33K
3R15
100
3R16 100
1
2
3
1XP10
1
2
3
1XS3
1
2
3
1XP3
6S1
6VR3
50KB
1
2
3
1XP4
6VR1-1
100KB
6VR1-2
100KB
6VR2-1
100KB
6VR2-2
100KB
6VR1
6VR2
1
2
3
4
5
6
1XS2
R
G
L
4
3
2
4
3
2
5
6
1
5
6
1
RGL
6
41
7
3
2
5
L
G
R
BASS
TREBLE
BASS
TREBLE
8
7
6
5
4
3
2
1
6
5
7
4
R
1
2
3
8
1
3
2
4
5
6
7
8
TAPE
SW1
SW2
LGR
BASS
TREBLE
AND 1XP2
AND 1XP1
TO TUNER
AM/FM Stereo Receiver
AAGG--337700
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, POWER PCB, POW SEL PCB
7C31
10P
7C30
10P
S2
7R78
10/2W
7R77
10/2W
1
2
1XS10
1
2
1XP10
1
2
3
1XP9
1
2
3
1XS9
1
2
3
4
5
1XP8
1
2
3
4
5
1XS8
1
2
3
4
5
1XP5
1
2
3
4
5
1XS5
1
2
3
1XS7
2S2
SPB
1X1
SPECKER
7V25
5401
S1
POWER SW
C1
103/250V
FU1
2.5A/250V
1C15
6800U/50V
1R3 15K
1C14
6800U/50V
1C16 104
1C17 104
1R2 15K
1D10
5404
1D11
5404
1D12
5404
1D9
5404
7C22
104
7C28
33U/50V
1D15 4004
1D18 4004
1D14
4148
7R69
10K
7R70
100
7R73
47K
7R74 47K
1C13
10U/50V
1R5 22K
7C27
220U/16V
7C26
220U/16V
1D13 4148
7R72
10K
7C25
4U7/50V
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
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
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
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
7R8
3K3
7R6
3K3
7C2
4U7/50V
7R2
1K
7V2
5551
7R18
100
7R20
100
7R16
22K
7R52
1K
7C18
47U/25V
7R4
100K
7C4 100P 7C3 100P
7R3
100K
7C24
10U/50V
7R67
2K7
7R68 3K3/1W
7R64
220K
7D8
4148
7R65
220K
7R66 4K7
1XP15
1XP17
1D1
4004
1D2
4004
1D3
4004
1D4
4004
1C1 100U/35V
1C2
104
1R1
100
1XP16
1D5
4004
1D6
4004
1D7
4004
1D8
4004
1C4
2200U/25V
1C5
2200U/25V
1C6 104
1C7 104
1N3
78M05
1N1
7812
1N2
7912
1C8
104
1C9 104
1C10
1000U/16V
1C11
1000U/16V
1C3 470U/16V
1D16 4004
1D17 4004
1R4
2K2
1C12 100U/25V
REL1
1FU1
5A/250V
1FU2
5A/250V
1
8
7
3
2
4
57K1
7R75 330
7R76 330
1
2
3
1XS4
2S1
SPA
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
7D11
4148
7D12
4148
7C29
103/50V
1D19 24V
1
2
3
4
5
6
1XS11
1C18
100U/35V
1R6 100
B/R-
B/L-
G
A/R-
A/L-
R
R
G
L
L
RRGL
AC 120V/230V
SEL.SW
VOLTAGE
DGND
SPA
SPB
-24V
0V AC
2.5V
2.5V
DGND
+5V
L
A/L-
A/R-
A/L+
A/R+
B/L+
B/L-
B/R+
B/R-
LGR
A/L-
A/R-
G
B/L-
B/R-
DG
SPBSPB
DG
B/L-
G
B/R-
+5V
G
G
+12V
1 st Issue; January 2003
AM/FM Stereo Receiver
AAGG--337700
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
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
2C30
100U/10V
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 471
2C15
203
2C9
15
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 9018I
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
2V6
9014C
2V7
9014C
2R24
100
2R27
1K5
2R28
1K5
2C53 18
2T2
2R25
510
2R26
510
2G3
L10.7M
2V8
9018H
2R29 300K
2R30 330
2R31 330
2C54
22
2R32 *24
2D2 IN4148
2C55
47
1 st Issue; January 2003
AM/FM Stereo Receiver
AAGG--337700
4 52 31
C
B
A
SCHEMATIC DIAGRAM
AG-370
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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14 PC1
PC0/TM0
PG0/INT
VSS
PB0/BZ
PB1/BZ
PB2
PB3
PA0
PA1
PA2
PA3
PB4
PB5 PB6
PB7
PA4
PA5
PA6
PA7
OSC2/PG2
OSC1/PG1
VDD
RES
PC5/TM1
PC4
PC3
PC2 15
16
17
18
19
20
21
22
23
24
25
26
27
28
8G1 4.00M
30P
30P
+5V
HT24LC02
5
6
+5V
100K
104 104
DIN
STB
CLK
DOUT
SDA
SCL
SPA
SPB
ST LED
PERIOD
CLOCK
DATA
SW2
SW1
TAPE
10K 10k 10k 10k 10k
+5V
1N4148
1N4148
1N4148
1N4148
1N4148
1N4148
10K
10K
8R15
56K
+5V
8R5
10K
8R1
10K
+5V
4PHONO
TAPE MO~ 3
65
VIDEO/AUX 2
FM MODE AM
1 FM1/2
TUNER 7
CD 8
AUTO/~ MEMORY
DOWNUP
3
4
5
6
2
1
-24V
+5V
+5V
1N4148
8C1
470U/16
8C3
100U/16
8D2
5.1V
8C2
104
8R2
10K
8C4
10uF/25
-24V
1
2
3
1XP7
1
2
3
1XP6
1XP14
1
2
3
4
8C10
104
GND
8D3
8D4
8D5
8D6
8D7
8D8
8R4 8R3 8R18 8R198R14
8N2
8C9
104
8C5
8C6
8R13
8C8
8C7
8D1
8R16
8R17
8N1
HT48R50A-1
8N3
+5V
8R20
1.2
8R21
1.2
12398765410111213 14 15 16 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 33 34 35
DGND
1.8V AC
1.8V AC
0V AC
SKEY 6
SKEY 5
SKEY 4
SKEY 3
SKEY 2
SKEY 1
KEY 1KEY 2KEY 3KEY 4
PA6
PA7
VFD 25114-1
1
2
3
4
5
6
7
8
9
10
11
33
32
31
30
29
28
27
26
25
24
23
12 13 14 15 16 17 18 19 20 21 22
44 43 42 41 40 39 38 37 36 35 34
PA3
PA4
PB7
PB6
PT6312
PB5
PB4
PA3
PA2
PB3
PB2
PB1
PC1
PC2
1 st Issue; January 2003
AM/FM Stereo Receiver
AAGG--337700
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.
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