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SM-142 R Service Manual - SM-142 CONTENTS PAGE Safety Instructions 1 Technical Specifications 2 Instructions Manual 4 Pin Voltages of IC's 15 Pin Voltages of Some Transistors 18 Oscillograms 19 Electrical and Service Adjustments 21 Trouble Shooting Guide 24 Convergence Adjustments 31 Channel Frequency Tables 33 Part List 37 Circuit Diagrams Attached PIN VOLTAGES OF IC'S IC101 (TDA956X H) TV signal processor-Teletext Decoder with embedded u-Controller Pin 1 Volume +/2 Status 1 3 Status 2 4 Digital ground for u-controller 5 Not connected 6 Standby on/off 7 Analog Gnd of text decoder and dig Gnd of TV processor 8 Secam PLL decoupling 9 2nd supply voltage TV proc (8V) 10 Supply volt.deccoup. of dig. Gnd of TV processor 11 Phase 2 filter 12 Phase 1 filter 13 Gnd 3 for TV processor 14 Decoupling bandgap 15 AVL (90 versions) / East/West drive signal (110 versions) 16 V-drive B output 17 V-drive A output 18 IF-1 input 19 IF-2 input 20 Reference current input 21 Vertical sawtooth capacitor 22 Tuner AGC output 23 Sound IF input 1 24 Gnd 25 Gnd 26 Norrow band PLL filter 27 AVL (Automatic Vol. Levelling) 28 Ext. Audio (audio 2) input 29 Audio 3 input (not connected) 30 H-drive output 31 Sandcastle output-Hor.Fly.input 32 Decoupling sound demodulator 33 QSS intercarrier output / AM output 34 EHT / overvoltage protection input 35 IF-PLL loop filter 36 Sound IF AGC 37 QSS output 38 IF video / selected CVBS output 39 main supply voltage TV processor 40 Internal CVBS input (*) Standby values are given in parenthesis Connection V DC (*) 3,2 (3,2) 0 (0) 0 (0) 0 (0) 0.75 (0.25) 0.01 (3.9) 0 (0) 2.3 (0) 8.0 (0.26) 5.0 (0) 2.73 (0) 3.9 (0) 0 (0) 4.0 (0) 3.0 (0.5) 1.0 (0) 1.0 (0) 1.87 (0) 1.87 (0) 3.9 (0) 3.8 (0) 4.3 (0) 1.9 (0) 0 (0) 0 (0) 2.2 (0) 0.42 (0.08) 3.73 (0.08) 3.73 (0.09) 2.33 (0.26) 0.56 (0.25) 2.0 (0) 3.43 (0.3) 2.2 (0.08) 2.45 (0) 0.5 (0) 0.6 (0) 3.0 (0) 8.0 (0.25) 3.8 (0) Pin Connection V DC (*) 0 (0) 0 (0) 0 (0) 3.35 (0) 0 (0) 3.4 (0) 2.8 (0.07) 3.45 (0) 0.17 (0) 2.6 (0) 2.6 (0) 2.6 (0) 2.6 -3.4 (0) 4.6-5.7 (0) see oscilog. see oscilog. see oscilog. 3.3 (3.3) 0 (0) 3.3 (3.3) 0 (0) 41 Gnd for TV processor 42 External CVBS input 43 Gnd for TV processor 44 SVHS-Y input 45 SVHS-C input 46 White stretch capacitor 47 CVBS output 48 Audio output/AM audio output 49 2nd IF video output (not conn.) 50 2nd RGB / YUV insertion input 51 Red input 52 Green input 53 Blue input 54 Beam current limiter input 55 Black current input / V-guard input 56 Red output 57 Green output 58 Blue output 59 Analog supply of text decoder and dig.supply of TV proc (3.3V) 60 OTP programming voltage 61 Dig. Supply to core (3.3V) 62 X-tal Gnd 63 X-tal input 64 X-tal output 65 Programming Reset (not connected) 66 Dig. Supply to periphery (3.3V) 67 SCL1 (Eeprom) 68 SDA1 (Eeprom) 69 IR input 70 Not connected 71 SCL 72 SDA 73 MSP reset (IC301) 74 Mute 75 SVHS switching 76 L/L' switching 77 F Blank MM Not conn. 78 Program + 79 CVBS sync filter 80 Program see oscilog. see oscilog. 4.9 (0)