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Teac AG-790 Service Manual
Teac AG-790 Service Manual

Teac AG-790 Service Manual

Am/fm stereo receiver
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Effective : April, 2003
SERVICE MANUAL
A A G G - - 7 7 9 9 0 0
AM/FM Stereo Receiver
CONTENTS
1 SPECIFICATIONS
2 ADJUSTMENTS AND CHECKS
3 EXPLODED VIEWS AND PARTS LIST
4 PC BOARDS AND PARTS LIST
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.
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NOTES
2
3
6
8
S-0092A

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Summary of Contents for Teac AG-790

  • Page 1 SERVICE MANUAL A A G G - - 7 7 9 9 0 0 AM/FM Stereo Receiver CONTENTS 1 SPECIFICATIONS ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ 2 ADJUSTMENTS AND CHECKS ・...
  • Page 2 1 SPECIFICATIONS Amplifier Section Voltage Conversion Output Power..100 + 100 watts RMS (0.9 % THD, 1 kHz, 8 ohms) (General export models only) 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 ......
  • Page 3 2 ADJUSTMENTS AND CHECKS 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.
  • Page 4 2-2 TUNER SECTION SETTING ADJUSTMENT ITEM ADJUST POINTS INPUT OUTPUT AG-790 FM 87.5 MHz 2L3 (3.5T) DC 1.0 0.05V ± FM 108.0 MHz Check DC 8.0 0.5V ± å 1. VT Adjust 2R19 (VT) 2J2 (GND) AM 530 kHz 2T2 (RED) DC 1.1...
  • Page 5 DC Voltmeter 2R19 TUNER PCB 2TC2 −  AM Signal Generator AM Loop Antenna AC Voltmeter 60cm FM Signal Generator AC Voltmeter Distortion Analyzer Stereo Signal Generator −5−...
  • Page 6 3 EXPLODED VIEWS AND PARTS LIST −6−...
  • Page 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                  ...
  • Page 8 4 PC BOARDS AND PARTS LIST MAIN PCB −8−...
  • Page 9 FRONT PCB HEADPHONE PCB SP SEL PCB TUNER PCB SP JACK PCB POWER PCB −9−...
  • Page 10 MAIN PCB ASSY FRONT PCB ASSY REF.NO. PARTS NO. DESCRIPTION REF.NO. PARTS NO. DESCRIPTION 9A09752260 MAIN PCB ASSY            9A09755060 FRONT PCB ASSY           9A09752300 MAIN PCB                  9A09755100 FRONT PCB                 9A06896100 FUSE CLIP         9A09756400 VFD DISPLAY     9A09754600 RCA JACK,RCA602          8D1           9A09592400 DIODE,ZENER 5V1 1/2W      9A09754700 RCA JACK,RCA402          8D2‑7         9A09589500 DIODE,IN4148    9A09754800 WAFER,3P          8G1           9A09592800 OSC,CRYSTAL 4.433M 9A09754900 WAFER,5P         ...
  • Page 11 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.
  • Page 12 AG-790 SCHEMATIC DIAGRAM MAIN PCB (1/2) 4R17 -12V 47U/16V -12V 4C19 47U/16V 5N1-1 4N1-1 4R13 4R15 4558D 4558D PHONO/L 4C17 2U2/50V 4R11 4R9 12K 180K 4C15 47U/16V 4C11 4C13 47U/16V 4C20 4R18 100 47U/16V 5R10 47U/16V 4N1-2 4R14 4R16 4558D...
  • Page 13 AG-790 SCHEMATIC DIAGRAM MAIN PCB (2/2), HEADPHONE PCB, SP SEL PCB, SP JACK PCB, POWER PCB 1XS7 1XP7 7R75 680 7C25 7R41 4U7/63V 7R76 680 7R25 7R29 3K3/0.5W 4148 7D11 7R67 4148 7D12 7V23 4148 7R57 5551 RELD 5401 7V19...
  • Page 14 AG-790 SCHEMATIC DIAGRAM TUNER PCB LOOP 2C14 2R19 2VD3 2TC2 2C40 *2TC1 2R17 2D2 IN4148 V149B 3U3/50V 100K 100K 4.5T 2C44 2VD1 K161GR V104 2C12 2C25 2C11 C1815GR TA2149N 2C28 2C42 RFGND FMRF 4.5M 2R23 TC9257F RFIN RFVCC 3.5T 2R32...
  • Page 15 AG-790 SCHEMATIC DIAGRAM FRONT PCB V F D 1XP4 8R30 8R31 8R21 10K 2.1V -24V 8R22 10K 2.1V DGND 1N4148 100U/35V SW16 100U/25V 8R27 KEY4 KEY3 KEY2 KEY1 STB CLK IC DIN DOUT 1N4148 BAND BALANCE SW13 SW15 LED1 470U/16V...