Microvitec Series 3 Colour Displays Monitors Service Manual

							COMPREFMODEL NO.PART NO.COMPONENT DESCRIPTIONL2(1496/LI2U)(2030/CS5)(2031/CS5)(2031/AX)(2032/AM)(1431AP/MS4)(1431AP/DS)(1431/AS)(1432/AS)(1431/BS)(1431/LS1)(1431/MZ3)(1431/MZ4)(1431/MB4)(1431/MR4)(1431/MS4)(1431/DS)(1435/MS)(1436/LS1)(1436/MS4)(1439/AS)(1439/MS)(1441/AL)(1441/AS)(1441/MS)(1441/MS4)(1486/LI2U)(1451/AS)(1451/DS)(1451/MS)(1451AP/MS4)(1451AP/DS)(1449/AS)(1456/LI2)(1241/AS)(1446/LF)(1446/LI2)(1241/AT)LW 104UA7CHOKE W IRE ENDED 10uH PC5640L201LW 154SK2CHOKE W IRE ENDED 15uH B78108-T1153-KL202LV001UA5COIL W IDTH PC3398L203LN002UA5COIL LINE LINEARITY PC5580L204LW 104UA7CHOKE W IRE ENDED 10uH PC5640L801-804(1441/AL)(1441/AS)(1441/MS)(1442)(1446/LF)(1446/LI2)(1241/AT)LW 154SK2CHOKE 15uH B78108-T1153-KL801LW 154VA5CHOKE W IRE ENDED 15uH PC3391L802LW 104VA4CHOKE W IRE ENDED 10uH PC2677L803/804LW 104VA4CHOKE W IRE ENDED 10uH PC2677L901LW 154UA5CHOKE W IRE ENDED 15uH PC3391 
						

							COMP REFMODELNO.PART NO.COMPONENT DESCRIPTIONFH3A/B(2031/CS5)(2031/AX)(2032/AM)(1431AP/MS4)(1431AP/DS)(1432/AS)(1431/BS)(1431/LS1)(1431/MZ3)(1431/MZ4)(1431/MB4)(1431/MR4)(1431/MS4)(1431/DS)(1435/MS)(1436/LS1)(1436/MS4)(1439/AS)(1441/AL)(1441/AS)(1441/MS)(1441/MS4)(1451/AS)(1451/MS)(1451AP/MS4)(1451AP/DS)(1451/DS)(1449/AS)(1456/LI2)(1241/AS)(1446/LF)(1446/LI2)(1241/AT)KS0001Y01FUSE CLIP-PCB MTG (5mm)HARNESSA00584I01TB -NO. 1 (4 LEADS) BR, OR, W , Y.HARNESSA00585I01TB - NO. 2 (8 LEADS)HARNESS(2031/CS5)(1449/AS)A00815I01TB - NO. 1 (4 LEADS) BR, OR, W , Y.HARNESS2031/CS5)A00816I01TB - NO. 2 (8 LEADS)HARNESS(1441/AL)A00104I01TB - NO. 1 (4 LEADS)HARNESS(1441/AL)A00179I01TB - NO. 2 (8 LEADS)IC1IV7812MX3VOLTAGE REGULATOR 1C 78M12IC1(HEATSINK)HH0003HAOHEATSINK 1 STAVER TYPE V6-2LIC101IT74136MM2OR/TTL LOGIC SN74LS136NIC102IV7805LXOVOLTAGE REGULATOR IC 1 78L05IC201IL1180PS2LINEAR Bl-POLAR IC TDA 1180P PLASTIC DIL S.G.S.IC301IL1170SS2LINEAR Bl-POLAR IC TDA 1170S PLASTIC DIL S.G.S.IC301(HEATSINK)HHC001HCOHEATSINK STAVER V8-800L2LW 473UA6CHOKE W IRE ENDED 10uH PC3774 
						

							COMP REFMODEL NO.PART NO.COMPONENT DESCRIPTIONFH1A/B,FH2A/B(2030/CS5)(2031/CS5)(2031/AX)(2032/AM)(1431AP/MS4)(1431AP/DS)(1431/AS)(1432/AS)(1431/BS)(1431/LS1)(1431/MZ3)(1431/MZ4)(1431/MB4)(1431/MR4)(1431/MS4)(1431/DS)(1435/MS)(1436/LS1)(1436/MS4)(1439/AS)(1439/MS)(1441/AL)(1441/AS)(1441/MS)(1441/MS4)(1451/AS)(1451/MS)(1451AP/MS4)(1451AP/DS)(1451/DS)(1449/AS)(1456/LI2)(1241/AS)(1446/LF)(1446/LI2)(1241/AT)KS0003Y01FUSEHOLDER L222/KFH3A/B(1496/LI2U)(1486/LI2U)KS0006Y01FUSE CLIP-PCB MTG (6.3mm) 
						

							COMP REFMODELNO.PART NO.COMPONENTDESCRIPTIONF2(2031/AX)(2032/AM)(1431/AS)(1432/AS)(1431AP/MS4)(1431AP/DS)(1439/AS)(1439/MS)(1451/AS)(1451/MS)(1451AP/MS4)(1451AP/DS)(1451/DS)(1241/AS)(1446/LF)(1446/LI2)(1456/LI2)(1241/AT)KA2001BAO! FUSE 2AMP (20mm) TIME DELAYF3(2031/AX)(1431/AS)(1432/AS)(1431AP/MS4)(1431AP/DS)(1431/AS)(1432/AS)(1431/BS)(1431/LS1)(1431/MZ3)(1431/MZ4)(1431/MB4)(1431/MR4)(1431/MS4)(1431/DS)(1435/MS)(1436/LS1)(1436/MS4)(1439/AS)(1439/MS)(1441/AL)(1441/AS)(1441/MS)(1441/MS4)(1451/AS)(1451/MS)(1451AP/MS4)(1451/DS)(1446/LF)(1449/AS)(1241/AS)(1446/LF)(1446/LI2)(1456/LI2)(1241/AS)KA1001BQOFH1 A/BA/BKS0001Y01 
						

							TYPICAL AUDIO SPECIFICATIONSTypical specifications for the audio amplifierstageareasfollows:Input impedance:47 k      nominalInput  sensitivity:100 mV typicalOutput:2watts max @ 1kHz into 16 ohmsTABLE OF OPTIONSConnectorAvailable StandardsPin No.W ire Colour CodingTTL1V/75RPAL10BrownO/C0V (S/C)0V (S/C)15Mauve•> 0.7V < 12V (O/C)0V (S/C)17Pink0V (S/C)> 10.5V < 12V (O/C)> 10.5V < 12V(O/C)NOTES:-    Not Critical (May be 0V to 12V or O/C)0/C   =     Open Circuit (No connection)S/C   =    Short Circuit (< 10 R) to 0V (Ground) 
						

							PARTS LISTCircuit ReferenceComponent ReferenceComponent  DescriptionRESISTORSR5, 20, 21, 23, 25, 27, 28RF104DJORESISTOR C/F 10K 1/4W 5%R6, 8RF562DJORESISTOR C/F 560R 1/4W  5%R7, 30RF473DJORESISTOR C/F 4K7 1/4W 5%R9RF156DJORESISTOR C/F 1M5 1/4W  5%R10RF183DJORESISTOR C/F 1K8 1/4W 5%R11, 12RF392DJORESISTOR C/F 390R 1/4W  5%R13, 18RF225DJORESISTOR C/F 220K 1/4W  5%R14, 15RF123DJORESISTOR C/F 1K2 1/4W 5%R16RF272DJORESISTOR C/F 270R 1/4W  5%R17RF273DJORESISTOR C/F 2K7 1/4W 5%R19RF184DJORESISTOR C/F 18K 1/4W 5%R22, 24, 26RF103DJORESISTOR C/F 1K0 1/4W 5%R31RL101DJORESISTOR M/FUS, 10R 1/4W  5%R32RF392DJORESISTOR C/F 390R 1/4W  5%R33RF152DJORESISTOR C/F 150R 1/4W  5%R40RF103DJORESISTOR C/F 1KO 1/4W  5%R101, 201RF104DJORESISTOR C/F 10K 1/4W 5%R102, 202RF222DJORESISTOR C/F 220R 1/4W  5%R103, 203RF100DJORESISTOR C/F 1R0 1/4W  5%VR1RQ102AL2POT PRESET 100R 0.1W  H7CAPACITORSC1,2CA337EN6CAPACITOR ALUM/ELEC 33uF 16VC3CK331JJOCAPACITOR CERAMIC/T 33pF 50VC4CK121JKOCAPACITOR CERAMIC/T 12pF 50VC5CK681JJOCAPACITOR CERAMIC/T 68pF 50VC6, 8-15CK104FLOCAPACITOR CERAMIC/T 10nF 25V 20%C7CM225KK6CAPACITOR MET/T 0.22uF 100VC16, 17, 18, 19, 20, 27CM105NL6CAPACITOR MET/T 0.1uF 250VC21CK222JKOCAPACITOR CERAMIC/T 220pF 50VC22CM105NL6CAPACITOR MET/P 0.1uF 250VC23CK103JKOCAPACITOR CERAMIC/T 1nF 50VC24CK151JKOCAPACITOR CER/T 15pF 50V AXIALC25, 26CM4758K6CAPACITOR MET/P 470nF 63VC30CA107JL7CAPACITOR A/ELEC 10uF 50V 20% RAD PRC31CA105NL6CAPACITOR CERAMIC/T 100nFC101, 102, 201, 202CA2268M7CAPACITOR A/ELEC 2.2uF 63V PREFC103, 203CA107JL7CAPACITOR A/ELEC 10uF 50V 20% RAD PRC104, 204CM225KL6CAPACITOR MET/P 0.22uF 100VC105, 205CA109HM6CAPACITOR ALUM/ELEC 1000uF 35VC106, 206CM105NL6CAPACITOR MET/P 0.1uF 250VC107, 207CA478FM7CAPACITOR ALUM/ELEC 470uF 25V 
						

							Circuit ReferenceComponent ReferenceComponent  DescriptionDIODESD1, 2, 3DZ73560FRODIODE ZENER BZX79B5V6 2%D4, 5DS4143UTODIODE 1N 4148 THOMSONINTEGRATED CIRCUITSIC1IL3301UM3CIRCUIT INT. TDA3301 SELECTEDIC2IG4551UM2CIRCUIT INT. 4551IC101, IC201IL19080S2CIRCUIT INT. TDA 1908CHOKES & DELAY LINESL1LW 474SK2CHOKE 47uHL2LW 105SK2CHOKE 100uHL3LW 104SK2CHOKE 10uHL4, 5LV001TA3CHOKE KAN K2819XML11LW 154SK2CHOKE 15uH B78108-T1153-KDL1ED0001P01DELAY LINE DL470DL2ED0002P01DELAY LINE DL711CONNECTORSPL1KP0026A17PLUG 17-W AY 20/3457PL2KP0026A16PLUG 16-W AY 20/3456PL102KP0025A05PLUG 5-W AY 20/3445PL103KP0025A03PLUG 3-W AY 20/3443PL104KP0025A04PLUG 4-W AY 20/3444TL1KP0024A03PLUG 3-W AY 20/3423MISCELLANEOUSFIT TL1KL9005Z02LINK TEST MOLEX 90059-0009 P/0X1XC0014UU6CRYSTAL IQD TYPE P A124D2 TRACK CUTSBC0111I02PCB PAL INTERFACELK1, 2, 3W L2214TU1WIRE LINK 5mm  x 14mm  x 5mmLK6 7, 8W L2212TU1WIRE LINK 5mm  x 12mm  x 5mmLK9, 10W L2214TU1WIRE LINK 5mm  x 14mm  x 5mmLK12, 13W L2212TU1WIRE LINK 5mm  x 12mm  x 5mmA01647101I/FACE ASSEMBLY TPL/STD - MC REV 3 
						

							SPECTRUM INTERFACE CARD - DESCRIPTION/OPERATION1.       LUMINANCE CHANNEL (Y)A.        The (-Y) signal contains:(1)  Video information(2)  line sync pulses(3)  frame sync pulse3.        The incoming Y signal is attenuated by the potential divider, R16, R17 the resultant signal is thenamplified by TR6.C.        Transistors TR7, TR8 and TR9 have the following functions:-(1)     TR7 - Separates the sync pulses(2)     TR8 - Inverts the sync pulses(3)     TR9 - Buffers the sync pulsesR28 and R29 in the emitter of TR9, splits the voltage swing to produce a SYNC TTL output.D.      The rising edge of the sync output signal is used by C6, R3Q and TR24 to produce a pulse which has thesame duration and timing as the colour burst gating pulse on the +/- (R-Y) signal.E.       The luminance signal on the collector of TR6, is clamped to the black level by C10 and TR25.F.        The black level is set by resistor/diode potential divider formed by VR1, (R36. R37, R65 and 2IN4148 diodes).2.      COLOUR DIFFERENCE CHANNELSA.      The -(B-Y) Channel(1)      The -(B-Y) signal is attenuated by a potential divider network R32 and R34. TR10 inverts andamplifies to produce + (B-Y). TR11 and C9 use the sync pulses to clamp the + (B-Y) signal tothe   black level.(2)      TR21 merges + (B-Y) clamped signal to +Y clamped signal to produce the BLUE output.(3)      TR22, is an electronic switch that has its threshold set by R56 and R57.(4)     The gain of TR22 is set by R58 and R59 to produce TTL levels. TR23 emitter follows the TTL signalwhich produces a buffered output.B.      The +/- (R-Y) ChannelThis channel is a phase alternating line (PAL) signal, which requires alternate lines, inverted toproduce + (R-Y).(1)     The incoming +/- (R-Y) signal is A.C. coupled by C17, C1 and TR1 thus forming a unity gain, phasesplitter.(2)     The non inverted output of TR1 drives an electronic switch (TR3). The inverted output of TR1 isbuffered by TR2.(3)     The (R-Y) switch is enabled during the colour burst, gating pulse.(4)      A set/re-set flip-flop switch formed by IC 1C and IC 1D works in the following :-(a)     SET - If next line of video is POSITIVE(b)    RESET - If next line of video is NEGATIVE(5)      The outputs of 1C1D enable bi-directional switches which will either:(a)    Connect +(R-Y) through C1(b)    Connect inverted -(R-Y) through C2.Thus producing +(R-Y). TR4 and TR5 clamp the +(R-Y) to the black level.(6)      The + (R-Y) clamped signal is added to the +Y clamped signal by TR13 to produce +R signal.(7)     TR14 has its threshold set by R43 and R42. the gain is set by R44 and R45, in order toproduce TTL levels.(8)      TR15 emitter follows the TTL signal thus producing a buffered signal output. 
						

							C.      THE (G-Y) OUTPUT(1)      This signal is generated by mixing the following:-(a)     The (B-Y) clamped signal. TR16 performs this mixing function(b)     The (R-Y) clamped signal, TR16 performs this mixing function(2)     The proportions of (B-Y) and (R-Y) clamped signals which are added together are set by R54 andR40.(3)     G OUTPUTS(a)    This signal is produced by the addition of the following signals:-(i)    (G-Y) clamped signal. TR17 performs this function. (ii)     +Y clampedsignal, TR17 performs this signal function.(4)     TR18 has its threshold set by R48 and R49. the gam is thus set by, R50 and R51 in order toproduce suitable TTL levels. (5)      TR19 emitter follows the TTL signal andproduces a buffered output. 
						

							__________________PROM INTERFACE PANEL_________________GENERAL1.       The Programmable-read-only-memory (PROM) interface panel is used with certain models in theSERIES-3 range of colour monitors. Two different versions of the panel assembly may be used -depending on model and intended country of operation.2.       Basically, the two versions are very similar.(1)      Versions incorporating R.F.I. filtering networks (L/C components L1   to L3 & C4 to C6), areemployed with certain models intended for use in countries other than the UK.(2)      Versions without R.F.I. filtering are currently used for models operating in the U.K.3.      Interface connections:(1)      W hen installed, this panel assembly interfaces between input connector PL101, located onSERIES-3 main chassis PCB and the monitors user 7-pin Din input socket.NOTE: The customer contrast control VR111, shown on the SERIES-3 main chassis circuitdiagram, is not fitted as shown when the PROM interface is used. In this case, thecustomer contrast control pot is connected to PL2, located on the PROM interface panel.(2)      The PROM-INTERFACE CONNECTION DIAGRAM provides wiring interconnection details.CIRCUIT DIAGRAM1.      The circuit diagram for the PROM INTERFACE PANEL provides circuit details of the panel assembly.Component values are given in the accompanying LIST of COMPONENTS.CIRCUIT DESCRIPTION1. The purpose of the PROM interface panel is to convert 4-Bit digital video signals, normally referred to asR.G.B. & Intensity, into Linear R.G.B. signals.2.      Colour Combinations4(1)     There are 16 possible colours which can be displayed (2 combinations).(2)      IC2, a fusible link PROM, provides sixteen 8-bit outputs corresponding to one of the 16 addressesselected by the R.G.B. and intensity signals.These outputs use 3-bits for RED and GREEN, and 2-bits for BLUE video, hence; there are 8 levelsof Red and Green and 4 levels of Blue available.(3)      Resistors R3 to R10 and resistors R11 to R18 form potential dividers respectively between baseand collector resistors of TR101, TR102, TR103, located on the SERIES-3 main PCB. Resistorsvalues are selected to weight respective PROM outputs, to least significant and most significantbits.NOTE: W hen the PROM interface Panel is installed, the moveable links PL103, shown in theSERIES-3 main circuit diagram, should be fitted into linked POSITION (1).3.     +5 Volt Supply(1)    IC1, C2 and C3 provides a regulated + 5V supply for IC2.4.       Protection & Termination(1)      Diodes D1 to D5 provide flash-over protection for IC2 and for computer signal in sources.(2)      Reistors R21 to R26 may be fitted on some models to terminate incoming digital signals.5.       Contrast Control(1) Transfer  TR1, R1 and an external pot connected to PL2 provide for customer control of contrast onsome models.(2)    TR1 form s an emitter follower, the voltage at the emitter determining the video output amplitude oncontrast.