Icom IC-R20 Service Manual - Page 61
Rec Unit, Sn74ahc1g66hdbv, Ml2302tb, K9f5608u0c, Sn74ahc1g02dck, M30620fcpgp, R1111n321b, Bd5228g
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Page 61 highlights
11-3 REC UNIT X2 CR-708 16.384 MHz C20 C21 22p 22p CLE ALE C11 0.01 D7 D6 D5 D4 D3 D2 D1 D0 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 P12/D10 P11/D9 P10/D8 P07/D7 P06/D6 P05/D5 P04/D4 P03/D3 P02/D2 P01/D1 P00/D0 P107/AN7/KI3 P106/AN6/KI2 P105/AN5/KI1 P104/AN4/KI0 P103/AN3 P102/AN2 P101/AN1 AVSS P100/AN0 VREF AVCC P97/ADTRG/SIN4 P96/ANEX1/SOUT4 P95/ANEX0/CLK4 C4 0.01 IC2 M30620FCPGP P13/D11 P14/D12 P15/D13/INT3 P16/D14/INT4 P17/D15/INT5 P20/A0(/D0/-) P21/A1(/D1/D0) P22/A2(/D2/D1) P23/A3(/D3/D2) P24/A4(/D4/D3) P25/A5(/D/D4) P26/A6(/D6/D5) P27/A7(/D7/D6) VSS P30/A8(/-/D7) VCC P31/A9 P32/A10 P33/A11 P34/A12 P35/A13 P36/A14 P37/A15 P40/A16 P41/A17 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 P42/A18 P43/A19 P44/CS0 P45/CS1 P46/CS2 P47/CS3 P50/WRL/WR P51/WRH/BHE P52/RD P53/BCLK P54/HLDA P55/HOLD P56/ALE P57/RDY/CLKOUT P60/CTS0/RTS0 P61/CLK0 P62/RXD0 P63/TXD0 P64/CTS1/RTS1 P65/CLK1 P66/RXD1 P67/TXD1 P70/TXD2/SDA P71/RXD2/SCL P72/clk2/TA1OUT 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 CS0 CS1 CS2 SUB_3C WR RD EPM SUB_3V A_SQL B_SQL SUB_RX SUB_TX BUSY SCLK RXD TXD CS1 WR CS2 R21 R22 100k 100k RD CS2 FUL MID EMP WR RD C13 0.01 IC4 1 2 3 A B GND VCC Y 5 4 SN74AHC1G02DCK IC5 1A 2B VCC 5 3 GND Y 4 SN74AHC1G32DCK RD RD WR WR C15 0.01 C14 0.01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 NC NC NC NC NC GND R/B RE CE NC NC VCC VSS NC NC CLE ALE WE WP NC NC NC NC NC NC NC NC NC I/O7 I/O6 I/O5 I/O4 NC NC NC VCC VSS NC NC NC I/O3 I/O2 I/O1 I/O0 NC NC NC NC 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 IC6 K9F5608U0C D0 D7 D1 D6 D2 D5 D3 D4 D4 D5 D6 D7 D3 D2 D1 D0 C16 0.01 MP1 MP2 FUL MID EMP WR RD CS D/C BUSY SIOCK DASD ADSD VCK DGND DACKL DREQL IOW IOR VOXO XT XT TEST0 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 D0 D1 D2 D3 D4 D5 D6 D7 DVDD TEST2 TEST3 TEST4 TEST5 TEST6 TEST7 TEST8 AVDD SG LOUT LIN MOUT MIN AGND TEST9 AOUT SPIN SPOUT- SPOUT+ NC NC NC AGND IC7 ML2302TB RD WR DVDD FUL MID EMP CH CBUSY RESET FIFOST DGND VR CB1 CB2 SPVDD AVDD 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 RD WR FUL MID EMP CBUSY RESET FIFOST C23 1 C22 C24 0.01 1 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 C17 18p R16 470k C19 0.01 R17 150k FUL MID EMP WR RD FIFOST RESET CBUSY EMP MID FUL WR RD A_AIN TXD RXD SCLK BUSY EPM B_SQL A_SQL SUB_3V P94/DA1/TB4IN P93/DA0/TB3IN P92/TB2IN/SOUT3 P91/TB1IN/SIN3 P90/TB0IN/CLK3 BYTE CNVSS P87/XCIN P86/XCOUT RESET XOUT VSS XIN VCC P85/NMI P84/INT2 P83/INT1 P82/INT0 P81/TA4IN/U P80/TA4OUT/U P77/TA3IN P76/TA3OUT P75/TA2IN/W P74/TA2OUT/W P73/CTS2/RTS2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 HJ1 SUB_3V 1 2 3 4 5 6 7 8 9 CNVSS RESET TXD RXD SCLK BUSY GND EPM R15 R19 R8 47k 47k 47k R1 10k IC10 R1111N321B VBUS 1 2 3 VDD GND CE VOUT 5 NC 4 C2 10 R9 10k C3 0.01 R10 47k CNVSS RESET TXD RXD SCLK BUSY EPM CNVSS RESET R12 330 X1 CR-672 6.000 MHz IC1 C6 C7 C10 BD5228G 33p 33p 0.1 1 OUT 2 VDD 3 VSS CD 5 NC 4 C5 0.01 VBUS R11 470 C8 0.1 C12 0.01 RSTO PWREN RXF TXE VBUS 32 31 30 29 28 27 26 25 EECS TEST AVCC AGND XTOUT XTIN VCC D0 VBUS J2 from/to USB jack 98 5 4 3 2 1 76 EP3 D+ D- VBUS EP4 R6 27 R7 27 EP1 C1 0.01 VBUS VBUS VBUS R13 1.5k VBUS 1 2 3 4 5 6 7 8 EESK EEDATA VCC RESET# RSTO# 3V3OUT USBDP USBDM IC3 FT245BM D1 D2 D3 D4 D5 D6 D7 GND 24 23 22 21 20 19 18 17 D1 D2 D3 D4 D5 D6 D7 GND PWREN# SI/WU RXF# VCCIO TXE# WR RD# 9 10 11 12 13 14 15 16 C9 0.033 TXE RXF PWREN TXD RXD SCLK BUSY EPM PWREN RXF TXE CBUSY FIFOST R_B RESET SUB_3V SUB_3C SUB_RX SUB_TX TXE RXF PWREN A_SQL B_SQL D0 A_SQL B_SQL D0 D1 D2 D3 D4 D5 D6 D7 TXE RXF PWREN REC UNIT 3.0V 3.1V CBUSY FIFOST RESET +3V SUB_3C R20 CPU_TX 100 CPU_RX C28 0.01 C27 Q2 100 UNR9119J Q1 UNR921NJ D0 D1 D2 D3 D4 D5 D6 D7 VOL_UP_DOWN SQL CBUSY FIFOST RESET J7 +3V SUB_3C VOL_UP_DOWN SQL CPU_TX CPU_RX 1 2 3 4 5 6 VOL_UP_DOWN SQL AOUT A_AIN B_AIN C25 0.01 1 5 2 3 4 AOUT J6 A_AIN B_AIN AOUT GND 1 2 3 4 C26 A_SQL 0.01 IC8 SN74AHC1G66HDBV 1 5 2 3 4 B_SQL C18 0.01 IC9 B_SQL SN74AHC1G66HDBV SQL VOL_UP_DOWN R18 330k VOL_UP_DOWN S2 UP SQL S1 SQL to LOGIC unit HJ9 to LOGIC unit HJ8 Explanatory notes VOLTAGE LINE RECORDING/PLAYING COMMON LINE RECORDING LINE PLAYBACK LINE S3 DOWN 11 - 4
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