Arcam-DivaDT81-tun-sm维修电路原理图.pdf

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1、DT81 DiVA DT81 Digital Radio Tuner Service Manual ARCAMARCAM Issue 1.0 RadioFans.CN 收音机爱 好者资料库 Contents List ! Contents list ! Circuit description ! Service guide ! Circuit diagrams ! Component overlays ! Circuit board parts list ! General assembly parts list RadioFans.CN 收音机爱 好者资料库 DT81 Circuit Des

2、cription Summary The L918 forms the basis of the DT81 DAB tuner. All the circuitry of the tuner is on the same board, with the exception of the front panel PCB. The tuner is based on the Roke Manor gold card which provides the RF receiver and DAB decoding. To accompany this module the DAB motherboar

3、d has various power supplies, a Hitachi H8 microcontroller, a D-A converter with output buffer, and an SPDIF transmitter. Power supplies and muting The mains transformer T1 is used for 230V and 115V operation, the voltage selection is done by fitting different fuses. F1 160mA is fitted for 230V and

4、F2 250mA for 115V. The front panel board is powered from the 7.5V unregulated supply (it has its own regulator). The digital supplies are switched by SW3, while the analogue supplies are on all the time while the mains is connected. Regulated supplies P15V, N15V. +/-15V for the output buffer and DAC

5、 5V regulator. P5VDAC. +5V supply for DAC. P5VDAB. 5V supply for DAB module. P5V. +5V supply for digital circuits - Micro and SPDIF transmitter. P10V. +10V supply for DAB module. P7V5_UR. Unregulated 7.5V supply goes to front panel. Z9 is a Toshiba TA7317. This controls the muting/bypass relay. The

6、same relay is used for power on/off muting and also FM tuner bypass mode. The muting circuit has a time constant of 2.5 seconds, so there is always a 2.5 second delay when un-muting the output. The FM tuner bypass switch is shown on this sheet (SW2) and is accessed from the front of the unit. Micro,

7、 DAB module, SPDIF Z204 is a Hitachi H8/3048F 16 bit microcontroller. It has FLASH program memory, and is programmed via header SK1. Z202 is a 64kbit parallel EEPROM used for storing multiplex data. this is where the system stores data about the multiplexes it finds when it does a search, and other

8、information (presets, compression level, sort type, display mode). Z205 is a 3 pin reset generator IC. SW1 is a latching push switch accessed from the rear of the unit. If the switch is pushed in, RDI_ON will be low. This has the effect of removing data services from the list of services. If the swi

9、tch is left out, RDI_ON will be high and the data services can be seen. SK3 is used to connect to the front panel, communication is done via the I2C bus. Power for the front panel comes in the form of P7V5_UR. Note that although P5V connects to the front panel, it is not used for power. Its purpose

10、is to light the front panel LED green. DAB module: JP1 is a 50 way SAMTEC connector which provides the interface to the Roke DAB module. All the I/O to the module is on this connector apart from the aerial input which has a cable going straight from the rear panel to the module. Communication betwee

11、n the micro and the DAB module is done via the serial port of each device on TX_DAB/RX_DAB. The digital audio output from the module comprise of MCLK (12.288MHz master clock), LRCK (48kHz left/right clock), SCLK (serial data clock) and SDATA (serial data). These signals go to the D-A converter, and

12、also to the SPDIF transmitter Z201. Z201 is the SPDIF transmitter. Each one of the differential ouputs is used separately. SPDIF_OP is for the optical output, SPDIF_CX is for the coax output. DAC Z101 is a CS4327 D-A converter, followed by filter/buffer Z102. This is followed by ac coupling capacito

13、rs. The relay RLY1 is the last stage before the phono output connectors. 2 stereo outputs are provided on SK101. SK102 is an input which gets routed through the relay when the relay is off. An external FM tuner can be connected to this, in order to avoid taking up an extra input on the amplifier. Wh

14、en the tuner is off or in bypass mode, the FM tuner is routed to the output. The digital audio outputs are also shown on this sheet. TX101 and associated components provide an isolated unbalanced SPDIF output on SK103, and Z4 produces an optical output. Software notes The system has non volatile sto

15、rage in the form of the EEPROM, Z202. The following information is stored there and is remembered at power up:- Service data - all the IDs and static prog types of the services available in the ensembles found in the last search. This is the information viewed when turning the knob. Service selected

16、 - last service selected. Display mode - prog type, dynamic label, data rate or signal quality. Display brightness - off, dim or bright. Compression level - off or 1-5. The following parameters are NOT remembered:- Engineering mode. If the unit is turned off while in engineering mode (or test mode),

17、 it will default back to user mode on power up. Bypass mode - the unit will always power up not in bypass mode. Secondary services - if a secondary service is selected when it is switched off, it will power up with the parent service selected. Erasing the EEPROM - to erase the EEPROM, go into engine

18、ering mode (SELECT +8), then hold down preset buttons 1,4,5,8. The display will say ERASING EEPROM followed by PASSED EEPROM TEST then EEPROM ERASED. If you switch the power off and on again, it will come on with all the parameters reset. Display mode - prog type Display brightness - bright Compress

19、ion - off. Selection Mode manual Test mode If you hold in the bypass button while powering up, this will put the unit in test mode. When the bypass button is released, the software version will be displayed. Pressing the front panel buttons will cause a message to be displayed. Turning the knob cloc

20、kwise or anticlockwise will cause a message to be displayed. Any RC5 remote commands will also be displayed, with command and system codes, and an asterisk for the toggle bit. Fault mode On switch on if the Roke module is not fitted, or if there is a problem with the RX or TX communication signal be

21、tween the module and the H8, the unit displays ERROR CIP FAILURE. DT81 Service Guide Fault diagnostics Fault Action No power Check mains fuse Check power supply rails No Audio output Check for digital output Check analogue power supply voltages Check DAC IC Fails to respond to commands Check supply

22、voltages Check DAB module No Display Check flex foil cable Check for dry joints on micro and display Spurious display readout Check for dry joints on display board Display reads “ERROR CIP FAILURE” DAB module not communicating with main micro replace DAB module Display reads “NO SERVICE FOUND” DAB m

23、odule not receiving signal check connections to DAB module/ replace DAB module Power supply test points Position Voltage TP1 0 volt reference TP2 +5 volts - DAB module TP3 +10 volts - DAB module TP4 +5 volts - DAC TP5 +15 volts TP6 -15 volts TP7 +5 volts Hints & tips ! No analogue signal - measure b

24、etween the junction of D10, D11 and D8, D9 for the secondary supply feed from the transformer, this should be 40 VAC. If this is low or missing the transformer will require replacing. ! Not responding to front panel controls check the processor is ok by pressing the bypass button, if the bypass rela

25、y functions then check the DAB module supplies are ok. If ok then replace the DAB module. ! Please note that there are no serviceable parts within the DAB module. 12345678 A B C D 87654321 D C B A ISSUE DRAWING NO. DRAWING TITLE Drawn by: DATE Filename ECO No.DESCRIPTION OF CHANGE J:ECO_wip01_1106 n

26、ew 1.7 roak moduleL918_1.1L918_1.1.DDB - L918c1_1.1.prj A & R Cambridge Ltd. Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB DIVA DT81 DAB Tuner - Project Sheet Circuit Diagram L918C1 CL11-Jun-2001 INITIALS Date Printed 14Sheetof Notes: REMOTE_BUSBYPASS BPSTBYLED PSU & Remote L9

27、18C2_1.1.SCH SPDIF_CXMCLK LRCKSCLK SDATABYPASS REMOTE_BUS BP SPDIF_OP STBYLED DAC and o/p amp L918C4_1.1.SCH LRCK MCLK SCLK SDATA SPDIF_CX SPDIF_OP Micro and Gold Card I/F L918C3_1.1.SCH Kit Mask FOR DT81 DAB TUNER EXCLUDE NF,DT81 Tooling & Fixing Holes Tooling Holes Main PCB Fixing Holes CLEARANCE

28、HOLE CHS2CHS3 F3 T100MASP CL03/10/00INITIAL PROTOTYPEA.0 Layout by Cliff DD4 CLOGO Update Box DD3 UPDATE_BOX PCB PCB L918PB_1 FD_1 FIDUCIAL FD_2 FIDUCIAL FD_3 FIDUCIAL FD_4 FIDUCIAL CL22/01/01PROTOTYPE (NEW DAC & TOSLINK)B.0 FIX6 FIXING HOLE 3.5 FIX7 FIXING HOLE 3.5 FIX1 FIXING HOLE 3.2 FIX2 FIXING

29、HOLE 3.2 FIX11 FIXING HOLE 3.5 FIX5 FIXING HOLE 3.5 FIX3 FIXING HOLE 3.5 FIX4 FIXING HOLE 3.5 FIX10 FIXING HOLE 3.5 FIX9 FIXING HOLE 3.5 FIX8 FIXING HOLE 3.5 CL19/03/01PRODUCTION RELEASE1.0 CHS4 01_1076 PG8/6/01ROKE MODULE V1.7 + changed R67 & R681.101_1106 12345678 A B C D 87654321 D C B A ISSUE DR

30、AWING NO. DRAWING TITLE Drawn by: DATE Filename ECO No.DESCRIPTION OF CHANGE J:ECO_wip01_1106 new 1.7 roak moduleL918_1.1L918_1.1.DDB - L918C2_1.1.SCH A & R Cambridge Ltd. Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB DiVA DT81 DAB Tuner - Power Supplies & Muting Circuit Diagr

31、am L918C2 CL11-Jun-2001 INITIALS Date Printed 24Sheetof Notes: F1 T160MA +C10 3M3 EL Vin I ADJ A Vout O Z2LM317T D3 1N4003F DAC Supply R18 3R3 FU R19 3R3 FU Vin I ADJ A Vout O Z3LM317T Vin I ADJ A Vout O Z5LM337T +C21 100U EL +C22 100U EL D4 1N4003F D5 1N4003F Vin I GND G Vout O Z77805 P15V N15V P10

32、V P5VDAB P5V DAC NL SK4IEC2 LIVE1NEUT1 PUNREG1 NUNREG1 N15V P15V P2 P3 P5 AGND1 GND1 ACAUD1 ACAUD2 ACAUDG1 ACDIG1 ACDIG2 NEUT2 AC115V AC230V HS HS2ATO220HS08REG TP1 TEST_POINT TP2 TEST_POINT TP4 TEST_POINT TP5 TEST_POINT TP6 TEST_POINT 115V units only 230V units only F2 T250MA115V ! WARN ! WARN ! WA

33、RN ! WARN 1 34 2 T2 CM_CHOKE ! WARN ! WARN ! WARN 1 2 3 SW3A A1014 4 5 6 SW3B A1014 LIVENEUT LIVE2 NEUT2 + C20 1M0 25V P15V D8 UF4003 D9 UF4003 D10 UF4003 D11 UF4003 D12 UF4003 D13 UF4003 D14 UF4003 D15 UF4003 115V 230V R20 1R0 FU R21 1R0 FU PWR 1 IN1 2 IN2 3 0V 4 V- 5 O 6 FB 7 RC 8 V+ 9 Z9 TA7317P

34、+ C34 1U0 EL -UR +UR +C23 100U EL + C35 1U0 EL D16 UF4003 7 8 9 SW3C A1014 RLY1C RLY 51SB12T D17 1N4148 P15V MUTE1 Analogue and Digital grounds are joined at the DAC, Z10 MUTE CIRCUIT POWER SUPPLIES +C37 1M0 35V + C38 1M0 35V +C39 1M0 35V + C40 1M0 35V +UR Connect ground to chassis fixing via decoup

35、ling capacitor C32. +C14 10U EL P5V FM Tuner Pass-through Near to PCB SK5A JACK3.5X2 Far from PCB SK5B JACK3.5X2 D18 4V7 400MW 3 2 1 Z10A LM393A SM 5 6 7 Z10B LM393A SM C41 680P PP L1 27MH 84 Z10C LM393A SM P5V QQ1 QPAD QQ2 QPAD QQ3 QPAD QQ4 QPAD QQ5 QPAD P5V REMOTE_BUS 10 11 12 SW3D A1014 Vin I GND

36、 G Vout O Z87805 +C28 100U EL P7 P5V +5V for DAB +5V for micro TP7 TEST_POINT BYPASS -UR 1 2 3 4 5 6 7 8 9 10 SK6 FFC10V -UR N15V +UR P15V P7V5_UR P5V MUTE1 MUTE1 BP ACAUD1 ACAUD2 ACDIG1 HS3A TO220HS30REG 17 16 1 7 230V 115V 11 18 22 20 14 13 21 5 6 12 2 8 0V 19 15 23 24 18V 0V 18V 7V5 0V 12V 0V T1

37、L848TX ACDIG2 Vin I ADJ A Vout O Z1LM317T +C11 10U EL D2 1N4003F DAB Module Supply +10V HS1A TO220HS30REG TP3 TEST_POINT ACDIG3 ACDIG4 ACDIG3 ACDIG4 D6 UF4003 D7 UF4003 D19 UF4003 D20 UF4003 +C29 3M3 EL P8 P9 EMCGND EMCGND +C27 220U EL +C24 220U EL P7V5_UR T1 T2 T3 T4 1 2 3 4 SK12 IDC4S EMCGND +C12

38、100U EL +C13 100U EL C62 1N0 PP C63 1N0 PP +C26 220U EL +C25 22U EL C33 10N SM +C19 100U EL R62 1R0 FU R72 1R0 FU R73 1R0 FU R74 1R0 FU CHS2 REMIN1 REMIN2 CL03/10/00INITIAL PROTOTYPEA.0 R22 100R 1W CF (NOT FITTED ON DT81, USES SWITCH ON DISPLAY BOARD) 1 2 3 SW2A 2PCO_NON_LAT 4 5 6 SW2B 2PCO_NON_LAT

39、STBYLED CL22/01/01PROTOTYPE (NEW DAC & TOSLINKB.0 CL19/03/01PRODUCTION RELEASE1.0R77 10K 0805 R30 10K 0805 R71 10K 0805 R33 10K 0805 R29 47K 0805 R32 47K 0805 R31 47K 0805 R28 47K 0805 R34 47K 0805 R70 47K 0805 R25 100R 0805 R24 1K8 0805 R12 8K2 0805 R13 8K2 0805 R27 33K 0805 R76 22R 0805 R58 2K7 08

40、05 0.1% R41 1K0 0805 R42 1K0 0805 R44 4K7 0805 R3 10K 0805 R4 10K 0805 R6 10K 0805 R5 10K 0805 R53 1K8 0805 R52 1K8 0805 R51 1K5 0805 1% R17 390R 0805 R56 220R 0805 R57 220R 0805 R54 2K4 0805 1% R55 2K4 0805 1% R43 1K0 0805 R16 330R 0805 R49 100K 0805 R50 100K 0805 R26 0R0 0805 C64 470P NPO 0805 C60

41、 470P NPO 0805 C61 470P NPO 0805 C65 470P NPO 0805 C32 10N 0805 C59 10N 0805 C36 100P NPO 0805 C42 100P NPO 0805 C50 10N 0805 C55 470P NPO 0805 C51 10N 0805 C31 220N X2 CLASS 01_1076 PG8/6/011.101_1106ROKE MODULE V1.7 + changed R67 & R68 12345678 A B C D 87654321 D C B A ISSUE DRAWING NO. DRAWING TI

42、TLE Drawn by: DATE Filename ECO No.DESCRIPTION OF CHANGE J:ECO_wip01_1106 new 1.7 roak moduleL918_1.1L918_1.1.DDB - L918C4_1.1.SCH A & R Cambridge Ltd. Pembroke Avenue Denny Industrial Centre Waterbeach Cambridge CB5 9PB DiVA DT81 DAB Tuner - micro circuit Circuit Diagram L918C4 CL11-Jun-2001 INITIA

43、LS Date Printed 34Sheetof Notes: SPDIF_OP P10V P5VDAB MCLK LRCK SCLK SDATA MD D1 BAS16W SM P5V P5V P5V P5V X1 16MHZ#A MD RDI Interface S/PDIF Transmitter DAB Module Connector EEPROM Reprogramming Interface P5V P5V BYPASS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 SK3 FFC22V To Display

44、PCB P7V5_UR P5V P5V P5V Decoupling for ICs Z204Z202Z203Z205 REMOTE_BUS P5VP5V nREQ P_mode 1 2 3 SW1A 2PCO 4 5 6 SW1B 2PCO P5V nReset SCL SDA SCL SDA nReset nReset nReset Vcc 2 Res 3 Gnd 1 DS1233 Vcc 4 Z205 DS1233M P5V Q2 ZVNL120 Q3 ZVNL120 Q1 ZVNL120 12 34 56 78 910 1112 1314 SK1 HEADER 7X2 Vcc 1 PB

45、0 2 PB1 3 PB2 4 PB3 5 PB4 6 PB5 7 PB6 8 PB7 9 Vpp/RESO 10 Vss 11 TxD0/P9.0 12 TxD1/P9.1 13 RxD0/P9.2 14 RxD1/P9.3 15 IRQ4/SCK0/P9.4 16 IRQ5/SCK1/P9.5 17 D0/P4.0 18 D1/P4.1 19 D2/P4.2 20 D3/P4.3 21 Vss 22 D4/P4.4 23 D5/P4.5 24 D6/P4.6 25 D7/P4.7 26 D8/P3.0 27 D9/P3.1 28 D10/P3.2 29 D11/P3.3 30 D12/P3

46、.4 31 D13/P3.5 32 D14/P3.6 33 D15/P3.7 34 Vcc 35 A0/P1.0 36 A1/P1.1 37 A2/P1.2 38 A3/P1.3 39 A4/P1.4 40 A5/P1.5 41 A6/P1.6 42 A7/P1.7 43 Vss 44 A8/P2.0 45 A9/P2.1 46 A10/P2.2 47 A11/P2.3 48 A12/P2.4 49 A13/P2.5 50 P2.6/A14 51 P2.7/A15 52 P5.0/A16 53 P5.1/A17 54 P5.2/A18 55 P5.3/A19 56 Vss 57 P6.0/WA

47、IT 58 P6.1/BREQ 59 P6.2/BACK 60 CLKOUT 61 STBY 62 RES 63 NM1 64 Vss 65 EXTAL 66 XTAL 67 Vcc 68 P6.3/AS 69 P6.4/RD 70 P6.5/HWR 71 P6.6/LWR 72 MD0 73 MD1 74 MD2 75 AVcc 76 Vref 77 P7.0/AN0 78 P7.1/AN1 79 P7.2/AN2 80 P7.3/AN3 81 P7.4/AN4 82 P7.5/AN5 83 P7.6/AN6/DA0 84 P7.7/AN7/DA1 85 AVss 86 P8.0/IRQ0

48、87 P8.1/IRQ1 88 P8.2/IRQ2 89 P8.3/IRQ3 90 P8.4/CS0 91 Vss 92 PA0 93 PA1 94 PA2 95 PA3 96 PA4 97 PA5 98 PA6 99 PA7 100 H8/3048F Z204 H8/3048F 12 34 56 78 910 1112 1314 1516 1718 1920 2122 2324 2526 2728 2930 3132 3334 3536 3738 3940 4142 4344 4546 4748 4950 JP1 50 W SKT A0 10 A1 9 A2 8 A3 7 A4 6 A5 5

49、 A6 4 A7 3 A8 25 A9 24 A10 21 A11 23 A12 2 RB 1 WE 27 CE 20 OE 22 VCC 28 VSS 14 NC 26 DQ0 11 DQ1 12 DQ2 13 DQ3 15 DQ4 16 DQ5 17 DQ6 18 DQ7 19 Z202 M28C64A A1 A0 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 P5V RDI SCL SDA REMOTE RESET nREQ BYPASS RDI_ON PMODE RXD1 TXD1 VPP MD PA4 PA5 PA6 PA7 BP 1 2 3 4 5 SK2 IDC5S 1 2 SK8 IDC2S 1 2 3 4 5 6 SK9 IDC6S 1 2 SK11 IDC2S 1 2 3 Z6A 74HC32 SM 4 5 6 Z6B 74HC32 SM 9 10 8 Z6C 74HC32 SM 12 13 11 Z6D 74HC32 SM VDD 14 GND 7