Denon-AVR1804-avr-sm维修电路图 手册.pdf

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1、SERVICE MANUAL MODEL AVR-1804/884 AVC-1880 AV SURROUND RECEIVER / AMPLIFIER 16-11, YUSHIMA 3-CHOME, BUNKYOU-KU, TOKYO 113-0034 JAPAN X0173V.01 DE/CDM 0307 For U.S.A., Canada, Europe, U.K., Asia, China,Taiwan R.O.C., Korea & Japan model 前、 必読。本機、火災、感電、 対安全性確保配慮 、法的電気用品安全法 、所定許可得製造。 従際、安全性維 持、記載 注意事項必

2、守。 本機仕様性能改良、予告変更 。 Please use this service manual with referring to the operating instructions without fail. Some illustrations using in this service manual are slightly different from the actual set. 修理際、必取扱説明書参照上、作業 行。 本文中使用、説明都合上 現物多少異場合。 補修用性能部品保有期間、製造打切後8年。 注意 RadioFans.CN 2 2 2AVR1804/884 / AV

3、C-1880AVR1804/884 / AVC-1880 SAFETY PRECAUTIONS The following check should be performed for the continued protection of the customer and service technician. LEAKAGE CURRENT CHECK Before returning the unit to the customer, make sure you make either (1) a leakage current check or (2) a line to chassis

4、 resistance check. If the leakage current exceeds 0.5 milliamps, or if the resistance from chassis to either side of the power cord is less than 460 kohms, the unit is defective. (1) (2) 500V 1M (1) (2) RadioFans.CN 3 3 3 AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 LEVEL DIAGRAMS FRONT/CENTR/SURR

5、OUND/SURROUND BACK LEVEL DIAGRAMS FRONT/CENTR/SURROUND/SURROUND BACK 20dB 10dB 0dB (200mV) -10dB -20dB 6CH IN 40dB 30dB 0dB (200mV) -10dB -20dB -12dB 6CH IN CD IN -10dBFS -30dBFS -20dBFS 6CH IN 6CH IN CENTER SURROUND SURROUND BACK DSP OUT -10dBFS -20dBFS -30dBFS D/A+ MUTE 6dB D/A OUT 100mV REF D/A -

6、10dBFS 0dBFS -20dBFS -30dBFS -23dBFS D/A OUT 70.8mV REF 6dB 6dB D/A OUT 100mV REF CENTER SURR/SB 6CH IN CD IN 0dBFS A/D +- -A/D 10dB 20dB 30dB 40dB FRONT INPUT BUFFER AMP A/D IN REV AMP A/D IN REV AMP A/D IN REV AMP DIR DIGITAL D/A OUT LPF REV AMP SW SUM REV AMP + HPF MUTE DSPD/A- - - SUM S/W + D/A

7、0dBFS MUTE + ELECTRIC VOLUME PRE AMPTONEPOWER AMP SPK OUT FRONT 2.83V (1W/8ohm) SPK OUT FRONT ATTH/P OUT -18dB -15dB VOL 00 25.5dB 15.5dB VOL 00 MUTE + 15.5dB -18dB H/P OUT 47mV (1W 8ohm) -35.5dB 25.5dB SPK OUT CENTER SURROUND SPK OUT 2.83V (1W/8ohm) RadioFans.CN 4 4 4 AVR-1804/884 / AVC-1880AVR-180

8、4/884 / AVC-1880 SUB WOORERSUB WOORER 10dB 10.5dB 6dB Config1 -38dBFS Config2-28dBFS LFE -20dBFS -30dBFS LFE 6dB 6dB Front D/A Out 200mV ref 6CH IN 0dBFS -10dBFS D/A OdB 10dB 20dB 30dB -10dB -20dB -30dB -5dB (200mV) (112mV) MUTE +D/A SUB_WOOFER - - -DSP OUT D/A OUT LPF SW SUM REV AMP REV AMP 6CH INP

9、UT + MUTE ELECTRIC VOLUME PRE AMP SUB WOOFER PRE OUT SUB WOOFER PRE OUT 150mV -15dB 21.5dB VOL 00 TO FRONT CH RadioFans.CN 5 5 5 AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 BLOCK DIAGRAMBLOCK DIAGRAM LINE_1 TV/DBS LINE_2 LINE_3 CR CB Y DVD/VDP LINE_3 LINE_2 LINE_1 CR CB Y D-VIDEO INPUT JAPAN ONLY

10、 VCR2 OUT MULTI OUT EX_SR EX_SL EX_FR EX_FL 6CH_INPUT EX_C FM ANT EX_SW AM ANT LOOP FILTER E3 ONLY MUTING FROM u-COM FM FRONTEND IF FILTER PLL CIRCUIT IF FILTER AM TUNING IF AMP MPX IC FM & AM IF IC L.P.F - R L BUFF + HPF + - + L/R SUM DIGITAL FILTER ADC CODEC AD1837 VOLUME VOLUME DIGITAL FILTER DAC

11、 + RMC GND IN CXA1511M RMC IN/OUT C-VIDEO INPUT COMP-VIDEO INPUT DVD/VDP TV/DBS DVD/VDP TV/DBS VIDEO SWITCH VIDEO SWITCH VIDEO SWITCH VCR-1 VCR-2 VCR1 OUT V.AUX INH D-VIDEO OUTPUT LINE_3 LINE_2 LINE_1 CR CB Y S-VIDEO INPUT VIDEO SWITCH VIDEO SWITCH INH DVD/VDP TV/DBS VCR-1 VCR-2 V.AUX VCR-1 OUT VCR-

12、2 OUT VCR2 OUT REC_SWITCHIG ANALOG IN DIGITAL IN COAXIAL OPTICAL_4 OPTICAL_3 OPTICAL_2 OPTICAL_1 DVD/VDP CDR/TAPE TV/DBS VCR1 VCR2 PHONO + CD V.AUX TUNER (JAPAN ONLY) ANALOG OUT CDR/TAPE OUT VCR1 OUT DIGITAL OUT RCLK1(68) TCLK1(65) ROM 512K X 8 TCLK2(47) RAM 64K X 16 74LV244 BUFFER fs 64fs 64fs 64fs

13、 RBCK(17) DIR LC89057W-VF4 DIGITAL AUDIO DECODER - SERIAL DATA I/O PORT COUT DIGITAL FILTER ADC FROM MICOM TC9274-011 INPUT_SWITCHIG TC9273-004 Lock DetectSelector XMCK Selector & INPUT DEMODULATION DATA fs RDATA(21) RLRCK(20) RMCK(16)256fs CCLK CLATCH CIN ALRCK MCLK ABCLK ASDATA DSDATA1 CLOCKCONTRO

14、L PORT VOLUME FL/FR/C/SL/SR/SW/SB fs 256fs MELODY 32 PF6(41) RFS1(69) RCLK0(61) DR0(60) DR1(67) CLK_IN(132) DT0(56) TCLK0(57) + VOLUME VOLUME VOLUME DIGITAL FILTER VOLUME VOLUME DIGITAL FILTER DIGITAL FILTER + + DAC DAC + + + DAC SW F SUM - - - - - TUNER PLL DATACXP740096 u-COM CONTROL DATA DIGITAL

15、AUDIO AUDIO SWITCHING TC9164 TC9482 VOLUME EX_FL DSP_FL ANA_HFP ANA_IN FLT DRIVER DATA LC75721NE FL DRIVER EX_C CENTER EX_SR SR SW EX_SW EX_SL ANA_HFP ANA_IN DSP_FR SL EX_FR REMOTE CONT IN/OUT 12MHz RESONATORKEY_MATRIX TC9184 TONE POWER AMP TONE DFT CON. FL DISPLAY 16-ST-42GNK SPK A + - + SPEAKER OU

16、T + - + FRONT A L FRONT A R FRONT B L - SPK B + + + + - SURR L + - SURR R + - FRONT B R + CENTER + BA7626 BA7626 Y C 1212 9 15 4 5 2 13 14 IC1001 IC1004 IC1001 +5V MONITOR OUT Q653 MONITOR OUT Q1014Q656 12 14 13 14 12133 IC1004 IC1008 3.3V 2.5V DSP DSP DIR BA7626 IC606 OSD LC74781 1 15 15 S-VIDEO DE

17、T BA7626 2 IC1001 BA7626 C-VIDEO DET 15 1 2 IC1008 NJM2509V 134 3 5 Q1022 IC1008 IC1007 C 1 Q1012 MUTE +5.6V(Y,CB,CR SWITCHING SAME) +5.6V RMC DATA OUT KIC9459 AVR RELAY B+ -36V FLT M5-MT L601 Y/C MIX Y/C YCY Q1017 7805 +5V (A/D POWER) FUNCTION,OP AMP TUNER VIDEO POWER +5V (DSP PART PWR) FUNCTION,OP

18、 AMP CODEC 7915 7805 LOW DROP 7805 7815 MAIN -B MAIN +B + MUTE - H/P OUT SW + - + PRE OUT + - SURR BACK/MULTI FL DRIVER u-COM FILAMENT AC 7805 RELAY RadioFans.CN 6 6 6 6AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 ADJUSTMENTADJUSTMENT Tuner Section (AVR-1804/884 only) CONNECTION DIAGRAM OF MEASURI

19、NG INSTRUMENTS ? FM STEREO MODULATOR FM SSG Digital Voltmeter 75ohm T402T403 IC402 VR402 TUNER BD R471 20+14 10dB ? AM T402T403 IC402 TUNER BD R471 VR401 FM ALIGNMENT InputOutputAdjustment Step Alignment Item Tuning Frequency Setting TypeFrequency Input Level ModulationCouplingTypeConnect toPointsAd

20、just to 1 Center Adjustment 98.1MHz (98.0MHz) FM SSG98.1MHz60dB Mono 1kHz 100% Antenna Terminal Digital Voltmeter R471T402 50mV 2Distortion 98.1MHz (98.0MHz) FM SSG98.1MHz60dB Mono 1kHz 100% Antenna Terminal Distortion Meter Output Terminal (L) T403 Minimum Distortion 3Repeat Steps 1 and 2 4Signal L

21、evel 98.1MHz (98.0MHz) FM SSG98.1MHz20dBOFF Antenna Terminal Light “TUNED” on FL Display VR402 AM ALIGNMENT OutputAdjustment Step Alignment Item FrequencyInput TypeConnect toPointsAdjust to Remarks 1Signal Level 999 (1000) kHz AM SSGVR401 Light “TUNED” on FL Display SSG OUTPUT 74dB (EMF) RadioFans.C

22、N 7 7 7 7AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 Audio Section Idling Current Required measurement equipment : DC Voltmeter 調整必要測定器 : 直流電圧計 Preparation (1)Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room tempereture 15 C 30 C (59 F 86 F). (2)Pre

23、setting POWER (Power sourse switch)OFF SPEAKER (Speaker terminal)No load (Do not connect speaker, dummy resistor, etc.) (1)、扇風機風通良場所避、通常使用状態置。周囲温度 1530、湿度常湿。 Adjustment (1)Remove top cover and set VR101, VR102, VR103, VR104, VR105 on Amp. Unit, VR106 on SURR.-BACK ch Amp. Unit at full counterclockwi

24、se ( ) position. (2)Connect DC Voltmeter to test points (FRONT-Lch: TP104, FRONT-Rch: TP105, CENTER ch: TP103, SURROUND-Lch: TP101, SURROUND-Rch: TP102, SURROUND-BACK ch: CP106). (3)Connect power cord to AC Line, and turn power switch ON. (4)Presetting.MASTER VOLUME : - counterclockwise ( min.) MODE

25、: 6CH STEREO FUNCTION: CD (5)Within 2 minutes after the power on, turn VR101 clockwise ( ) to adjust the TEST POINT voltage to 1.5 mV 0.5 mV DC. (6)After 10 minutes from the preset above, turn VR101 to set the voltage to 2.5 mV 0.5 mV DC. (7)Adjust the Variable Resistors of other channels in the sam

26、e way. (1)上、基板VR101, VR102, VR103, VR104,VR105 及Surr. Back 基板VR106 反時計方向 () 回切状態。 (2) (FRONT-Lch: TP104, FRONT-Rch: TP105, CENTER ch: TP103, SURROUND-Lch: TP101, SURROUND-Rch: TP102, SURROUND-BACK ch: CP106) 直流電圧計接続。 (3)電源AC100V （95105V 範囲可）接続、電源ON 。 (4)後、次。 VOLUME（音量調節）反時計方向 () 回、最小状態。 SPEAKER-A（端子

27、）無負荷（、抵抗器接続。） MODE : 6CH STEREO FUNCTION : CD (5)2分以内VR101 時計方向 () 回電圧次調整。 1.5mV 0.5mV DC (6)予備調整10分後VR101 回、次電圧設定。 2.5mV 0.5mV DC (7)同方法各可変抵抗調整。 VR104 TR104 VR105 TP105 VR106 CP106 S Back ch S Rch VR102 TP102 VR103,TP103 C ch VR101,TP101 F Lch S Lch F Rch DC Voltmeter RadioFans.CN 8 8 8 8AVR-1804/8

28、84 / AVC-1880AVR-1804/884 / AVC-1880 SEMICONDUCTORSSEMICONDUCTORS Only major semiconductors are shown, general semiconductors etc. are omitted to list. 主半導体記載。汎用半導体記載省略。 ? ? ? ? ? ICs CXP740010 (IC201) PH7 PH6 PH5 PH4 PH3 PH2 PH1 PH0 PK7/TO1 RST VSS XTAL EXTAL PK6/CS0 PK5/SI0 PK4/SO0 PK3/SCK0 PF7/AN

29、11 PF6/AN10 PF5/AN9 PC6 PC7 PA0 PA1 PA2 PA3 PA4 PA5 PA6 PA7 NC VDD VSS PK1/TX PK2/TEX PI1/RMC PI2/NMI PI3/TO0/ADJ PI4/INT1/CS1 PI5/SCK1 PC5 PC4 PC3 PC2 PC1 PC0 PB7/SI2 PB6/SO2 PB5/SCK2 PB4/TO2 PB3 PB2 PB1 PB0 PJ7 PJ6 PJ5 PJ4 PJ3 PJ2 PJ1 PJ0 PD7 PD6 PD5 PD4 PD3 PD2 PD1 PD0 PI6/SO1 PI7/SI1 PE0/INT0 PE

30、1/INT2 PE2/PWM0 PE3/PWM1 PE4 PE5 PE6 PE7 PG0/TxD PG1/RxD PG2/EC0 PG3/EC1 PG4/EC2 PG5/INT3 PG6/INT4 PG7/CINT AN0 AN1 AN2 AN3 PF0/AN4 PF1/AN5 PF2/AN6 PF3/AN7 AVDD AVREF AVSS PF4/AN8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 100 99 98

31、 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 21 22 23 24 25 26 27 28 29 30 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 TOP VIEW CXP740096 Terminal Function 19274 STBOTC9274 CONTROL 29274 73 9164 CLKOTC9274/TC9273/TC9164 CONTROL 39274 73 9164 DATOT

32、C9274/TC9273/TC9164 CONTROL 4FRONT MUTEOFRONT MUTE 59273 CEOTC9273 CONTROL 6ERR MUTEOERR MUTE 7ERR MUTE OFFOERR MUTE OFF 889057 AUDIOILC89057 CONTROL 989057 EMPHAILC89057 CONTROL 10SW SUMOSW SUMMING CONTROL 11M32 SDINIDATA INPUT FROM MELODY32 1289057 SDINIDATA INPUT FROM LC89057 13EPROM RESETOEPROM

33、RESET 1489057 RESETOLC89057 RESET 15M32 CSOMELODY32 CS 16M32 SDOUTOMELODY32 CONTROL DATA 1789057 CEOLC89057 CE 1889057 1837 SDOUTOCONTROL DATA 1989057 1837 SCLKOCONTROL CLOCK 201837 RESETOCODEC RESET 219164 CEOTC9164 CONTROL 22SW MUTEOSW MUTE 23RELAY SPK BOSURROUND BACK RELAY Pin No. Pin NameFunctio

34、nI/O RadioFans.CN 9 9 9 9AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 Pin No. Pin NameFunctionI/O 24RELAY SPK AOFRONT A RELAY 25RELAY SURROSURROUND RELAY 26RELAY CNTOCENTER RELAY 27RELAY H/POH/P RELAY 28FUNC UPIENCODER INPUT(FUNCTION) 29H/P DETECTIH/P DETECT 30FUNC DOWNIENCODER INPUT(FUNCTION) 31N

35、C- - - - - - - - - - - - - 34SURR MUTEO O O SURROUND MUTE KIC9459 CONTROL STB ZONE2/SURROUND BACK : SELECTION RELAY FRONT B RELAY 359459 STB 36MULTI SB RLY 37RELAY SPK B 38FL DRV RESETOLC75721NE RESET 39RELAY POWEROPOWER RELAY 40RESETIRESET 41GNDI 42XTAL 43EXTAL 44FL DRV CEOLC75721NE CE 45FL DRV DAT

36、AOLC75721NE DATA 46FL DRV/2090 CLKOCONTROL CLOCK 472090 DATAOBU2090F DATA 48VOL DOWNIENCODER INPUT(VOLUME) 49VOL UPIENCODER INPUT(VOLUME) 50SEL DOWNIENCODER INPUT(SELECT) 51SEL UPIENCODER INPUT(SELECT) 52AVSS 53VREF 54AVDD 5589057 INT 56GND 57STEP OPTIAREA SELECT LC89057 INT 58SET OPTIMODEL SELECT 5

37、9GND 60KEY IN3IKEY INPUT 61KEY IN2IKEY INPUT 62KEY IN1IKEY INPUT 639K/10K STEPITUNER STEP SELECT 64PROTECTIPROTECTION 65C-VIDEO DETI I Composite Signal detect input (H: Signal input) S Signal detect input (H: Signal input) 66M32 SCLKOMELODY32 CLOCK 671837 CEOCODEC CE 68M32 RESETOMELODY32 RESET 69S-V

38、IDEO DET 70STBY LEDO O O STANDBY LED LC74781 CONTROL ENABLE LC74781 CONTROL CLOCK 71NC 72NC 7374781 CS 7474781 SCLK 75SURR BACK MUTEOSURROUND BACK MUTE 762090 CLK2OBU2090 CONTROL CLOCK2 (VIDEO) 32CNT MUTEOCENTER MUTE 33NC RadioFans.CN 10 10 10 10AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 Pin No.

39、 Pin NameFunctionI/O 77PWR DOWNI I POWER DOWN DETECT 78RDS CLKO O TDA7330 CONTROL CLOCK 79RDS DATAOTDA7330 CONTROL DATA MUTE power ON/OFF switching80MUTE PWR 819184 CEOTC9184 CONTROL 82M32 INTREQI/OMELODY32 CONTROL 83MULTI MUTEOMULTI MUTE 84S. MONITOR DETS Monitor connection detect input (L: Connect

40、ed) 85REMOCONI - - - - - REMOTE CONTROL SIGNAL INPUT 86GND 87GND 88VSS 89VDDVDD BACK UP 90NC 91TC9482 CEOTC9482 CONTROL 92PLL DATAOPLL CONTROL (LC72131), DATA (TC9482, TC9184, KIC9459) PLL CONTROL (LC72131), CLOCK (TC9482, TC9184, KIC9459) PLL CONTROL (LC72131), 93PLL CLKO 94PLL DT INO 95TU MUTEOTUN

41、ER MUTE 96STEREOISTEREO DETECT 97TUNEDITUNED DETECT 98PLL CEOPLL CONTROL 992090 CLK 1 VIDEOOBU2090 CONTROL CLOCK1 (VIDEO) 100 2090 DATA VIDEOOBU2090 CONTROL DATA (VIDEO), LC74781 CONTROL DATA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28

42、27 26 25 24 23 A15 A14 A13 A12 A11 CE I/O0 I/O1 I/O2 I/O3 Vcc GND I/O4 I/O5 I/O6 I/O7 WE A10 A9 A8 A7 NC A0 A1 A2 OE UB LB I/O15 I/O14 I/O13 I/O12 GND Vcc I/O11 I/O10 I/O9 I/O8 NC A3 A4 A5 A6 NC A0-A15 CE OE WE 64K x 16 MEMORY ARRAY DECODER COLUMN I/O CONTROL CIRCUIT GND VCC I/O DATA CIRCUIT I/O0-I/

43、O7 Lower Byte I/O8-I/O15 Upper Byte UB LB CE OE WE LB UB PIN DESCRIPTION Pin Name Address inputs Symbol A0-A15 Data Inputs/OutputsI/O0-I/O15 Chip Enable Input Output Enable Input Write Enable Input Lower-byte Control (I/O0-I/O7) Upper-byte Control (I/O8-I/O15) No ConnectionNC PowerVCC GroundGND IS61

44、LV6416 (IC806) PIN DESCRIPTION Pin Name Address Inputs Symbol A0-A18 Data Input/Outputs, Command InputsDQ0-DQ7 Data Input/OutputsDQ8-DQ14 Data Input/Output or Address InputDQ15A-1 Chip Enable Output Enable Write Enable Reset/Block Temporary Unprotect Ready/Busy OutputRB Byte/Word OrganizationBYTE Su

45、pply VoltageVCC GroundVSS No Connected InternallyNC Dont Use as Internally ConnectedDU E G W RP A1A0 A2E A3VSS A4G A5DQ0 A6DQ8 A7DQ1 A17DQ9 A18DQ2 RBDQ10 NCDQ3 NCDQ11 RPVCC WDQ4 NCDQ12 NCDQ5 A8DQ13 A9DQ6 A10DQ14 A11DQ7 A12DQ15A-1 A13VSS A14BYTE A15A16 24 13 12 1 25 36 37 48 M29W800T M29W800T 19 A0-A

46、18 W DQ0-DQ14 M29W800AT E 15 G RP DQ15A-1 BYTE RB VCC Vss M29W800AT (IC805) RadioFans.CN 11 11 11 11AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 MELODY32 (IC804) Pin Name MELODY32 Terminal Function Pin No. Pin Name Pin No. Pin Name Pin No. Pin Name Pin No. Pin Name Pin No. Pin Name Pin No. 1D14 2D

47、15 3HAD0 4HAD1 5GND 6HAD2 7HAD3 8HAD4 9HAD5 10HAD6 11HAD7 12HAD8 13VDDEXT 14HAD9 15HAD10 16GND 17HAD11 18HAD12 19VDDINT 20HAD13 21HAD14 22HAD15 23HA16 24HACK_P 25VDDEXT 26HACK 27HCMS 28HCIOMS 29GND 30HALE 31HRD 32HWR 33GND 34PF0 35PF1 36PF2 37PF3 38PF4 39PF5 40VDDEXT 41PF6 42PF7 43TMR0 44TMR1 45TMR2

48、 46DT2 47TCLK2 48TFS2 49DR2 50RCLK2 51RFS2 52RXD 53TXD 54GND 55GND 56DT0 57TCLK0 58VDDINT 59TF50 60DR0 61RCLK0 62RFS0 63VDDEXT 64DT1 65TCLK1 66TFS1 67DR1 68RCLK1 69RFS1 70BMODE0 71BMODE1 72BYPASS 73RESET 74TDO 75TDI 76TMS 77GND 78TCK 79TRST 80GND 81EMU 82VDDINT 83OPMODE 84A0 85A1 86A2 87A3 88A4 89A5

49、 90VDDEXT 91A6 92A7 93A8 94GND 95A9 96A10 97A11 98A12 99A13 100 VDDEXT 101 A14 102 A15 103 A16 104 A17 105 GND 106 A18 107 A19 108 A20 109 A21 110 BGH 111 BG 112 BR 113 BMS 114 IOMS 115 MS0 116 MS1 117 MS2 118 VDDEXT 119 MS3 120 ACK 144 1 109 108 72 7336 37 TOP VIEW 121 WR 122 RD 123 D0 124 D1 125 D2 126 D3 127 VDDINT 128 D4 129 GND 130 CLKOUT 131 VDDEXT 132 CLKIN 133 XTAL 134 GND 135 D5 136 D6 137 D7 138 D8 139 D9 140 D10 141 D11 142 D12 143 VDDEXT 144 D13 RadioFans.CN 12 12 12 12AVR-1804/884 / AVC-1880AVR-1804/884 / AVC-1880 AD1837 (IC808) AD1837 Te