DiVA T51 AM/FM Tuner Service Manual
Contents
1. 2 41 13 2 sr SK1 R42 15 A COM1 zd A S1 A S2 A S3 54 547 _ 100 ams _ S6 R61 A S7 100K MF _ S9 A S10 Default Low AI S13 14 15 16 17 2 520 FFC22V C12 10NCD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 4 16 07 UN 1N4148 IFCNT a 22 08 VBL 220R1WCF FFC22V 1 4148 p 0101 144148 144148 R59 220R 1W R63 2208 1W 1 4148 R64 2208 1W 067 114148 T51 Tuner amp R Cambridge Ltd Pembroke Avenue Denny Industrial Centre Circuit Diagram Cambridge CBS 9PB 9 No INITIALS DATE DESCRIPTION OF CHANGE ISSUE Filename Date Printed Drawn by G DATA ECO ECO AGENDA 00_1078 1892 T51 TUNERIL892 11 892 1 ddb L892C4 1 2 95 2000 CAH SJB Sheet 4 of 4 DRAWING L892CT 1 2 3 4 5 6 7 8 DOWN UP STORE BAND 1 9 2 10 3 11 4 12 5 13 6 14 7 15 8 16 SW206 SW214 SW213 SW212 SW211 SW205 SW204 9 SW203 9 SW202 9 SW2102 SW209 0 5 208 9 SW201 9 SW207 9 SK201 TACTSW2 TACTSW2 TACTSW2 TACTSW2TACTSW2 TACTSW2 zh E E E a E EL FFC22H lt lt lt lt lt lt lt lt SECO X NND NO E T E E D 132. Ci C3 Snap off after assembly TUNE 8 _2 Overlay LJ 13 Sep 2000 51 1 892 1 2 Reference Description Part Number CERD 100P 63V C10 ELST 100U 25V 2N710 R32 44 R45 R47 48 R74 R85 RES MF WA 1 10K S MF WA 196 4K7 MF 1 47K S WA 196 100 S MF WA 196 4K7 S MF WA 196 10K S MF WA 1 100K 5 S MF W4 1 15K S MF WA 1 68K S MF FU W3 5 10R 25 MF WA 1 10K MF WA 1 22K S MF WA 1 10K S MF WA 196 5K6 MF W4 1 100K S MF WA 196 10K S MF 820R 196 S WA 1 1K2 S WA 196 4M7 S MF WA 196 5K1 S MF WA 196 330R S MF WA 196 4K7 S MF WA 196 10K S MF WA 196 82K S MF WA 196 NOT S MF WA 196 120R S MF WA 196 1K0 S MF WA 196 1K0 E D N H133 H315 H322 H251 H210 H133 H133 H210 H347 H233 H247 H010 H310 H247 H210 H247 391 382 TETE eE RJ cmpImI m T T o N T 000 TJISSE 5 ot gt 322 N 5 5 SK2 22 WAY FFC CONN 8 8022 SK3 10 WAY FFC CONN VERT BK8010 5 4 5 4 WAY 80224 MAINS 2 8 014 COPPER RIVET 48 BS SK6 6 WAY VERT DIL PIN 8K6306 HEADER FM AM PCB COAX amp CLIPS 116 5 8 5 9 6 8 6306 HEADER 5
3. 10 5 2WAY VERT 8K6201 1 CONNECTOR TRANSFORMER CRYSTAL 4 500MHz 7X017 PARALLEL 5CT230 Z8 Z9 Z10 T51 Display Board L893 2 Reference Description Part Number MCD BACKLIGHT L802ML MCD BACKLIGHT LED GREEN 3 1MM SLR 3D007 37MG3F LED GREEN 3 1MM SLR 3D007 37MG3F RES MF WA 1 330R RES MF FU W3 5 3R3 1G833 NFR25 RES 1 220R 18122 DISP1 E E LED1 C2 C3 D1 12 13 LED2 RXI REMOTE RX SBX1610 52 B2103 38KHZ 10 WAY FFC CONN HORIZ BK8110 SK201 22 WAY FFC ONN HORIZ 8K8122 SK202 22 WAY FFC ONN HORIZ 8K8122 TACT SWITCH 2 PIN LOW PROF 9 5mm ACTUATOR SW201 204 SKHVPH SW205 TACT SWITCH 2 PIN LOW A1504 PROF 1508 SW206 TACT SWITCH 2 PIN LOW 1504 SW207 TACT SWITCH 2 PIN LOW A1508 210 SKHVPH TACT SWITCH 2 PIN LOW CER RESON 4 00MHz 7 005 SOCKET 18 0 3 85018 9 5mm SW211 A1504 214 PROF 71 IC CMOS MICRO 5 16 54 PIC16C54XT P X T51 General Assembly Parts List QTY me CS ee ___ mm mmu p em __ ___ ___ ___ meme b 5 mm ___ ___ _ jme me 5 ew jew mw wmm jemeweemwwnsswuw ___ ___ wem ___________ 11106 100 5 16 11166 160mAS 17 Ir FUSEHOLDER COVER m
4. E i 5 i 5 5 5 LED 7 IIS M P5V1 co gt SS a ee ED D et Bee Y LI rm D Jc 2 r D 7 2 b D D DISP1 52 LCD R204 220R MF BL1 LED1 Ir LED GREEN3 1MM VBL1 E875PM EL3 E875PM MCD BACKLIGHT SK1 2 MUTE O P Remote 14 FWAM 6 D1 7 1N4148 19 po zen R3 3R3FU _ 10 FFC10H RX1 SBX1610 52 FIX1 FIX2 FIX3 4 FIX5 FIX6 FIX7 FIX8 FIX9 e 0C 0 0 0 Q0 0 OC EL1 002 001 PS1 DRAWING TITLE DRILL DWG UPDATE BOX PHOTO STRIP T51 DISPLAY BOARD 13 09 00 MECHANICAL MODS 2 0 31 7 00 PRODUCTION RELEASE 1 0 00_1081 PCB1 A amp R Cambridge Ltd Pembroke Avenue Denny Industrial Centre E Circuit Diagram 102 p Waterbeach 9 ECO No INITIALS DESCRIPTION OF CHANGE ISSUE LRO3PB 2 Cambridge CB5 9PB B Filename Date Printed Drawn by G DATA ECO ECO 00 1081 L893 T51 TUNER DISPLAYAL893 11893 1 ddb L8945 Sepn2000 CL Sheet 1 of 1 DRAWING NO L893CT 1 2 3 4 5 6 8 _ NIS ___ H amp c K 2135 f e e gt EI e ps 179 I 51 TUNER DISPLAY um b POHER 1 10275 20235 R204 DISP1 EL3 EL2
5. AMSIG1 15K MF 9 E 2 7 TE 2o tE _ 100 EL PP FMBIRD BC547B TKO MF FMAUD E OP te AFMIN Ja 7 547 A 8 gt S olg R68 24 Fit JP7 to SK10 for less cross mod 51 7 Fit JP7 to SK11 for less de sensing lt p D C86 EE EL GNE 12 100 C30 C24 eae 10NCD 100 isi e 10R FU ES C14 10N CD C10 las 100U EL AMRF 2 E C70 100P CD 2 2 Link 1 amp 3 2 amp 4 for best sound quality SK7 C75 R15 Link 3 amp 5 4 amp 6 for best selectivity 69 100P CD 2 140 CD R17 ey gt C55 2 1U0 EL 557 ol MITSUMI D24 ONTUNE R80 MF R92 Q19 BC557B 220R MF C28 SFE10 7MLA 4K7 MF R73 1M0 MF 220R MF R93 1 On Tune LED on display SFE10 7MLA FMLOA i DRAWING TITLE 22P CD 51 Tuner 12 09 00 R93 WAS 2208 NOW 1 0 12 31 7 00 INITIAL RELEASE 8 Cambridge Ltd Pembroke Avenue Denny Industrial Centre Circuit Diagram Cambridge CBS 9PB g ECO No JINITIALS DATE DESCRIPTION OF CHANGE ISSUE Filename Date Printed Drawn by G DATA ECO ECO AGENDA 00_1078 L892 T51 TUNERIL892 11 892 1 ddb L892C2 1 2 95 2000
6. CAH SJB Sheet 2 of 4 DRAWING L892CT 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 R45 108 FU d L Q1 100U EL li 10 CD BC557B R33 4K7 MF alu Q4 BC547B C36 R41 470N PE 5K6 MF LL A 88 _ is R1 91K MF H101 91K MF SK5 IEC2 N 1N0 PP zie C16 10U EL C591N0 CD C601N0 CD PIZV VBL PSV zy 7805 P5V6 _ Luc Audio amp Backlight _ uns I T I HF Power Digital Power Power Supply Power Suppl Supply Supply NES C611N0 CD C62 1NO CD C58 100U EL 100U EL 100U EL 1N4003F 100U EL T51Tuner 8 R Cambridge Ltd ee Pembroke Avenue Denny Industrial Centre Circuit Diagram Waterbeach Cambridge CB5 9PB ECO No INITIALS DATE DESCRIPTION OF CHANGE ISSUE Filename Date Printed Drawn by G DATA ECO ECO AGENDA 00_1078 1892 T51 TUNERIL892 11 892 1 ddb L892C3 1 2 95 2000 CAH SJB Sheet 3 of 4 DRAWING NO L892CT 1 2 3 4 5 6 1 2 3 4 5 6 7 8 P12V R22 us 100R FU AK7 MF C19 15 C33 C15 10N CD 100U EL 05 i P5V6 Sy 017 2 7 18 10 1N4003F Q7 NIS BC547B n Q13 OF1 EL cure AY SK3 P5V J Q20 02 L201_ _ ZNNL120 3 Em 33UH AX 8 T3 678 P5V 54 100U EL
7. Q21 are part of the AGC circuit The position of the jumper link JP7 to either SK10 or SK11 determines from which point the AGC circuit is triggered The default is for the jumper to be fitted to SK10 which minimizes cross modulation and prevents the IF amp becoming saturated The LA1266 Z9 demodulates the IF at pin 1 into an audio output at pin 12 The quadrature coil is a double tuned device for best distortion performance When a station is tuned correctly the On Tune signal goes low and drives a green LED on the display PCB This signal is also used by the auto stop detection and muting circuits AM Tuner amp IF The LA1266 Z9 contains the AM RF amplifier oscillator and mixer circuitry Switching between FM and AM modes is controlled by the FM signal from the micro controller which disables the AM circuitry of Z9 and switches the path of the audio signal through Z8 MW LW switching is performed by switching transistors Q12 Q14 amp 015 Each band has its own oscillator and aerial tuning coils tuned by a varicap diode all contained within the AM module L5 The 450kHz IF signal is filtered by coil and ceramic filter combination T5 Birdie Filter The Birdie Filter L2 is a four pole low pass filter flat to about 53kHz then with a very steep roll off from then on This is designed to reduce co channel interference in FM Stereo and cut down on irritating birdie noises Stereo Decoder Stereo de
8. Service Manual 151 Issue 1 0 DIVA T51 9 g ARCAM Contents List Contents list Circuit description Circuit diagrams Component overlays Circuit board parts list General assembly parts list T51 Tuner Circuit Description Power Supply Mains voltage selection is made by placing a fuse of appropriate value in the 115V or 230V position The single secondary is rectified and regulated and supplies four regulators ZT is always powered when the mains is connected and keeps the preset memory of the micro controller intact The high value capacitor C84 will keep this data safe for a limited time in case of mains power failure Z5 provides the main 12V supply rail for the RF and audio circuits This is always connected except for the supply to the FM front end which is disabled by Q2 when the unit is turned off ZA powers the LED back light on the display PCB Z6 is the 5V digital supply for the micro controller FM Tuner amp IF The FM aerial input is mixed in the front end which provides a 10 7MHz IF output This is filtered and amplified by ceramic filters 1 amp CF2 and the circuit based around Q9 amp Q10 A third filter CF3 can be put in circuit by fitting jumpers JP1 amp JP2 across pins 2 amp 4 and 1 amp 3 of SK6 respectively This effectively narrows the IF band to improve selectivity Transistors Q17 and
9. TLE 51 Tuner Circuit Diagram ELI PS DD4 PHOTO STRIP CEMI 207 Tooling amp Fixing Holes Tooling Holes FDI PD3 TOOLING TOOLING 5 2 PD4 TOOLING TOOLING Main PCB Fixing Holes FIX1 FIX2 FIX4 e 000 FIX6 FIX7 FIX8 e D 100 PCB L892PB 1 ELIO DD1 DD2 003 il DRILL DWG CABLE TIE DD A2V DD A2H Kit Mask Exclude NF parts from kit mask i e Not Fitted This applies to R4 and R104 00 1078 12 09 00 R93 WAS 2208 NOW 1 0 1 2 amp Cambridge Ltd Pembroke Avenue 17 7 00 PRODUCTION RELEASE 1 ERA DESCRIPTION OF CHANGE ISSUE 4 Fil Date Printed Drawn by Cambridge CB5 9PB 00_1078 L892 T51 TUNER L892_1 L892_1 ddb here 2 Sep 2000 CL Sheet 1 of 4 DRAWING 1892 2 3 5 6 7 8 P12V Q3 R38 BC557B 4K7 MF R29 Nap R37 Low AM 10K JV 4K7 MF 011 NI R40 27 R53 E Ec AM IFT BC547B 100N PC 100K MF AMSIG3 R58 R44 100 68K MF Ee C54 R16 C50 C49 L5 100 EL 22K MF 47N CD 47N CD 8 MODULE AMSIG2 022 47N CD 100 EL AMAUD s 18 _ AM Audio gt 100 EL
10. coding is performed by LA3401 Z8 The 38kHz reference signal is accurately created by ceramic resonator X3 and does not require adjustment Stereo separation is adjusted for maximum by preset RV1 This IC also contains FM AM audio switching and muting functions Audio Filters amp Output The left and right channel audio outputs from Z8 are filtered by the de emphasis network of R1 etc The correct de emphasis network is selected by the position of jumpers JP3 amp JP4 on the pins of SK8 C2 amp C102 220pF are selected for 50us and C3 amp C103 560pF for 7505 de emphasis The final filter based on Z3 is a two pole low pass circuit with a cut off frequency of around 20 7 Also included is a 19kHz notch filter L1 amp that removes most of the residual pilot tone Muting When the power switch is turned off Q5 is switched off enabling the mute circuitry of the stereo decoder Z8 via diode D9 This removes the need for output muting transistors and eliminates switching clicks and pops At switch on the mute is enabled while C21 is charged via Z8 In normal use the mute inside Z8 is enabled in three other Ways The AMUTE signal from the micro controller is active at power on and for a short time when a preset is changed When the band is changed the output is muted by charging 52 The audio output must muted whenever the tuner is in stereo mode and is also off tune This is to eliminate noise dur
11. ing tuning and is provided by Q8 and the MONO and OFF TUNE control signals In Mono mode this mute is disabled so that weak stations can be heard despite the noise Micro controller Control of the T51 tuner is performed by a single micro controller Z10 LA7230 This also provides keypad input and drives a LCD directly At power on a matrix of diodes is scanned to set up the controller for the correct options D7 selects the correct frequency ranges D10 enables the use of Auto tuning as well as manual tuning 08 allows the Auto tuning mode to use the IF Count method of searching The position of jumpers JP 5 amp JP6 fitted to SK9 are used to disable or enable LW and also whether the AM band steps are 9 kHz UK or 10 kHz USA Z10 provides control signal outputs for the following functions MONO To defeat the stereo decoder Turns the mute circuit when a button is pressed amp during tuning FM MW amp LW Only one output active low at any one time Used to switch on specific parts of the RF circuitry as appropriate The micro controller includes a Phase Locked Loop PLL circuit which compares the tuner local oscillator signals FMIN amp AMIN with a reference frequency Based on this information and the required tuned frequency the controller varies the tuning voltage to the FM and AM front ends The tuning voltages FMVt amp AMVt have to be filtered from the PLL by the ci
12. rcuitry around Q7 amp Q13 Display PCB The display PCB holds the keypad LCD display LED back light module and On Tune indicator The remote control receiver consists of the receiver RX1 and the PIC micro controller 21 which is used to decode the incoming remote control codes from RCS format to Sanyo type commands This is because the Sanyo micro controller Z10 can only respond to Sanyo remote control commands Jumper Settings Jumper Option 1 Option 2 Best sensitivity Best sound JP2 Best sensitivity Best sound JP3 De emphasis 5005 De emphasis 7505 JP4 De emphasis 5005 De emphasis 7505 1 5 LW amp 1 6 AM spacing 9OKHz spacing 10KHz JP7 Less X MOD Less De sense USA Rest of the World If the T51 is transferred from or to the USA the following jumper settings will require changing Jumper Rest of the USA Action World JP3 5008 7515 De emphasis JP4 5005 7515 De emphasis JP6 9KHz 10KHz AM spacing 2 3 5 6 7 8 LK31 LK41 LK51 LK22 LK32 LK52 LK23 LK33 LK43 LK53 LK24 LK34 LK44 LK54 LK25 LK35 LK45 LK55 LK26 LK36 LK46 LK56 LK27 LK37 LK47 LK57 LK18 LK28 LK38 LK48 LK58 LK19 LK29 LK39 LK49 LK59 LK20 LK30 LK40 LK50 LK60 FM AM IF Demodulator 189262 1 2 SCH Microprocessor and PLL L892C4 1 2 5 Stereo decoder and Audio L892C3 1 2 SCH DRAWING TI
13. w uo meme meae D mn o msmwmemsense sem o 10 WAY FLEXFOIL REMOTE PCB 27 SNAP SPACER COPPER ADHESIVE CUT FROM ROLL 1807 TRANSFORMER E HE6V06B ERE No 6 x 6mm SCREW EN HF4V09B fF No 4 x 9mm SCREW EM o HA3V10A M3 x 10mm SCREW T51 General Assembly Parts List uem ereeem d Due 53 OO Lam Ll em i meweweag Pi 5 LIGHT SLEEVING LIGHT PIPE SLEEVING 6mm Lem SE EE m memeemwmemm EE 1 lobe
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