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
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