Teac AG-D7900 Service Manual
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Teac AG-D7900 Service Manual

Av digital home theater receiver
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Effective : February, 2002
SERVICE MANUAL
A A G G - - D D 7 7 9 9 0 0 0 0
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.
AV Digital Home Theater Receiver
S-0000A

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  • Page 1 SERVICE MANUAL A A G G - - D D 7 7 9 9 0 0 0 0 AV Digital Home Theater Receiver NOTES PC boards shown are viewed from parts side. ● The parts with no reference number or no parts number in the ●...

  • Page 2: Table Of Contents

    CONTENTS SPECIFICATIONS..........................3 SAFETY INSTRUCTIONS ........................4 MEASUREMENTS AND ADJUSTMENTS ..................5 FIP DISPLAY ............................8 DISPLAY PIN CONNECTION ......................9 IC BLOCK DIAGRAMS AND PIN FUNCTIONS ................10 EXPLODED VIEWS AND PARTS LIST .....................22 PC BOARDS AND PARTS LIST ......................24 INCLUDED ACCESSORIES .......................30...

  • Page 3: Specifications

    SPECIFICATIONS Amplifier Section AM Tuner Section Surround Output Power (0.9 % THD, 1 kHz, 8 ohms): Tuning Range: 60 + 60 watts (Front) 530 kHz – 1,720 kHz (10 kHz steps) 60 watts (Center) Usable Sensitivity: 55 dB/m 60 + 60 watts (Rear) Total Harmonic Distortion: 0.8% at 85 dB/m Delay Time: Signal-to-Noise Ratio: 45 dB at 85 dB/m...

  • Page 4: Safety Instructions

    SAFETY INSTRUCTIONS PRECAUTIONS DURING SERVICING The leakage-current should be less than 0.5mA rms AC. The resistance measurement should be done between 1. Parts identifide by the ( )symbol parts are critical accessible exposed metal parts and power cord plug for safety. Replace only with parts number specified. prongs with the power switch (if included) "ON".

  • Page 5: Measurements And Adjustments

    MEASUREMENTS AND ADJUSTMENTS ALIGNMENT INSTRUCTIONS EQUIPMENT NEEDED: AM Signal Generator FM Signal Generator Oscilloscope VTVM(AC, DC) Test loop antenna (AM Adjustment) Dummy antenna (FM Adjustment) Distortion analyser IMPORTANT 1. Check power-source voltage. 2. Set the function switch to band aligned. 3.
  • Page 6 1. TUNING FREQUENCY RANGE ADJUSTMENTS (FM) DC VOLTMETER ....CONNECT TO TEST POINT J208 and GND Band Frequency Adjust for Adjustment 87.50MHz 1.6V 530 kHz L105 J208 [US/C] [530 kHz] [1V] [L105] 2. AM TRACKING ADJUSTMENT Signal Generator ......Connects to the AM ANT. Coil through the loop antenna. Adjust for the indication of VTVM of the wave form of scope to be maximum.
  • Page 7 4. FM MONO DISTORTION ADJUSTMENT DC VOLT METER ......Connect to J205 (-), J207 (+) through the chock coil (100uH). Signal Generator ......Connect to FM ANT Jack (FM IN) through the dummy. Distortion Meter ......Connect to the output. Frequency Adjust for Adjustment 100.10MHz T101...

  • Page 8: Fip Display

    FIP DISPLAY ANODE CONNECTION SOURCE VCR 1 CHURCH DISCO STADIUM HALL THEATER AC-3 DELAY.T STEREO PRESET CH. MEMO TAPE DIGITAL PRO LOGIC TUNED STEREO...

  • Page 9: Display Pin Connection

    PIN CONNECTION Pin No. Connection P16 P15 Pin No. Connection Pin No. Connection 10G NP Pin No. Connection...

  • Page 10: Ic Block Diagrams And Pin Functions

    IC PIN FUNCTION (u-COM : ANAM1308AT,O.T.P :TMP87PM78F) : IC71 PIN No. SYMBOL DESCRIPTION 1,25 Power Supply Port(+5V) Function SW1,SW2 Function Encoder Control Port Speaker ON/OFF Front Speaker Relay Drive Port(“H”) Not Use(No connection) DSP Reset Reset (Initial Clear) Port for YSS912 Surr.
  • Page 12 Dolby Digital/Pro Logic DTS DECODER (YSS912C:INPUT IC43) PIN No. SYMBOL DESCRIPTION 1,31,71 VDD1 +5V Power Supply(for I/Os) RAMCEN External SRAM interface /CE RAMA16 External SRAM interface address 16 RAMA15 External SRAM interface address 15 SDIB0 PCM input 0 to Sub DSP(not use) SDIB1 PCM input 1 to Sub DSP(not use) SDIB2...
  • Page 13 PIN No. SYMBOL DESCRIPTION RAMA2 External SRAM interface address 2 72 ~ 79 RAMD0~7 I+/O External SRAM interface data (STREAM0~7 output when External SRAM is not in use) SDWCK0 Word clock input for SDIA, SDOA, SDIB, SDOB SDBCK0 Bit clock input for SDIA,SDOA,SDIB,SDOB SDIA0 AC-3 Bitstream (or PCM) data input for Main DSP SDIA1...
  • Page 14 YSS912C BLOCK DIAGRAM SDOB Interface /CSB 24 * 16 OVFB Sub DSP RAMA 0~16 RAMOEN RAMWEN RAMCEN SDIB Interface RAMA 0~7 SDIBSEL SDIB3 SDIB2 SDIB1 SDIB0 SDOA2 SDOA1 SDOA0 SDOA Interface 24 * 16 Main DSP OPORT 0~7 AC-3/Pro Logic/DTS decoder Input Buffer IPORT 0~7...
  • Page 15 M62446FP (ELECTRONIC VOLUME/INPUT IC31) OUT4 DVoo OUT3 OUTPUT volume PORT MCU I/F OUT2 DATA OUT1 LATCH AVoo DGND volume SWin AGND GNDS SWout volume SRin SRout SLin SLout GNDC Cout volume Rout GNDR Lout AVss volume GNDL BYPASSR volume BYPASSL LTRE RTRE tone...
  • Page 16 PIN ASSIGNMENT (74HCU04AFN : IC40 ) LOGIC SYMBOL (10) (11) (13) (12) TRUTH TABLE...
  • Page 17 AK4112AVF (DIR/INPUT IC41) AVSS AVDD MCKO1 MCKO2 Clock Clock X’tal Recovery Generator Oscillator Input Selector 96kHz FS96 Detect DAUX LRCK BICK Audio V/TX DAIF SDTO Decoder DVDD DVSS TVDD System CCLK CDTO Control AC-3/MPEG Error Detect CDTI Detect AUTO P/S="L" [Serial Control Mode] AVSS AVDD...
  • Page 18 LC72131 (PLL SYNTHESIZER/ TUNER IC11) REFERENCE PHASE DETECTOR DIVIDER CHARGE PUMP XOUT SAMLLOM COUNTER UNLOCK FMIN 1/16, 1/17 4bits AOUT DETECTOR 12bits PROGRAMMABLE AMIN DIVIDER UNIVERSAL DATA SHIFT REGISTER IFIN LATCH COUNTER POWER RESET BO1 BO2 BO3 BO4 LA1837 (MPX + IF / TUNER IC12) 3 rd 5 th DECODER ANTI-BIRDIE...
  • Page 19 KIC9164AF (FUNCTION/INPUT IC20) BLOCK DIAGRAM L-COM R-COM L-COM R-COM L-COM R-COM L-COM R-COM DATA SHIFT REGISTER KIC9163AF (FUNCTION/INPUT IC21) BLOCK DIAGRAM L-COM R-COM L-COM R-COM L-COM R-COM L-COM R-COM DATA SHIFT REGISTER...
  • Page 20 BLOCK DIAGAM (NJM2296M /MAIN IC96) Vin1 Vin2 Vout1 6.2dB dirver Vin3 6.2dB Vout2 dirver Vin4 6.2dB Vout3 dirver Vin5 LA6462M/6458M PIN CONFIGURATION • PIN FUNCITON 1. A OUTPUT 2. A-INPUT 3. A+INPUT 4. V 5. B+INPUT 6. B-INPUT 7. B OUTPUT 8.
  • Page 21 TRANSISTOR, REGULATOR IC BLOCK DIAGRAM TO-92S TO-92 TO-220 TO-92L 1. Emitter 1. Emitter 1. Emitter 1. INPUT 2. Collector 2. Collector 2. Collector 2. OUTPUT 3. Base 3. Base 3. Base 3. GND 1 2 3 12 3 KSA1175Y KRC114M KTD1302T KTA1268GR KSA916Y...

  • Page 22: Exploded Views And Parts List

    EXPLODED VIEW...
  • Page 23 EXPLODED VIEW REF.NO. PARTS NO. DESCRIPTION REMARKS 1            9A09337600 PANEL,FRONT               CGW1A279XH10            2            9A07047400 BADGE                     KGB1A056H12             3            9A06777500 KNOB,POWER                KBT2A450                4            9A08955800 KNOB,SPEAKER              CBT1A715                5            9A08955900 KNOB,MODE                 CBT1A716                6            ‑‑‑‑‑‑‑‑‑‑ PHONES PCB ASSY 7            9A08886900 BRACKET,PCB               CMK1A010                8            9A09333910 FRONT PCB ASSY            COP11480B 9            ‑‑‑‑‑‑‑‑‑‑ JACK PCB ASSY 10           ...
  • Page 28 INPUT+TUNER PCB ASSY FRONT PCB ASSY REF.NO. PARTS NO. DESCRIPTION REF.NO. PARTS NO. DESCRIPTION 9A09334610 INPUT+TUNER PCB ASSY      9A09333910 FRONT PCB ASSY            9A09338800 INPUT+TUNER PCB           9A09334100 FRONT PCB                 9A08215300 PACK,FRONT END            BK71,BK72     9A08888700 BRACKET,FLT               AN1           9A07371900 TERMINAL,ANT              CH94,CH95     9A08889400 CONNECTOR,HOUSING         BN13,BN14     9A08036700 WAFER                     CN10          9A08889500 WAFER,CARDCABLE           CF11,CF12     9A06544600 FILTER,CERAMIC E107MSHAT  CN11         ...
  • Page 29 MAIN PCB ASSY MAIN PCB ASSY REF.NO. PARTS NO. DESCRIPTION REF.NO. PARTS NO. DESCRIPTION 9A09334210 MAIN PCB ASSY             Q670       £ 9A09341100 TR,2SC4466                9A09334400 MAIN PCB                  Q681‑Q685     9A03745000 TR,KSC2785‑YTA            9A08952300 BRACKET,PCB               Q901,Q935     9A08878300 TR,KRC107M                9A08745400 BRACKET,PCB(H/T)          Q938‑Q940     9A08884100 TR,KRA107M                9A08952200 HEAT SINK                 Q942,Q943     9A03745000 TR,KSC2785‑YTA            C906       £ 9A08944600 C,ELECT 1000UF 25V        Q951         ...

  • Page 30: Included Accessories

    INCLUDED ACCESSORIES REF.NO. PARTS NO. DESCRIPTION REMARKS 9A08901100 OWNER'S MNL,E/F           CQX1A707Z               9A08763300 REMOTE CONTROL UNIT,UR‑417 CARTAGD8900             9A08886000 ANT,FM T                  CSA1A010Z               9A08886100 AM LOOP ANTENNA ASSY      CSA3A011Z              ...
  • Page 31 AG-D7900 BLOCK DIAGRAM A A G G - - D D 7 7 9 9 0 0 0 0 AV Digital Home Theater Receiver 1 st Issue; July 2001...
  • Page 32 AG-D7900 SCHEMATIC DIAGRAM NOTES: 1. Resistor values are in ohms (k=kilo-ohms, M=megohms). 2. Capacitor values are in microfarads (p=picofarads). 3. £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.
  • Page 33 AG-D7900 SCHEMATIC DIAGRAM NOTES: 1. Resistor values are in ohms (k=kilo-ohms, M=megohms). 2. Capacitor values are in microfarads (p=picofarads). 3. £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.
  • Page 34 AG-D7900 SCHEMATIC DIAGRAM A A G G - - D D 7 7 9 9 0 0 0 0 NOTES: INSTRUCTIONS FOR SERVICE PERSONNEL 1. Resistor values are in ohms (k=kilo-ohms, M=megohms). BEFORE RETURNING APPLIANCE TO THE CUSTOMER, MAKE LEAKAGE- 2.

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Agd-7900

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