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Goldstar MBM-2105GIA manual

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Table of contents for the manual

  • Page 1

    GolclStar MONOCHROME MONITOR SERVICE MANUAL WTION BEFORE SERVICING THE CHASSIS, READ THE “SAFETY PREtXJTK)NS”, IN THIS MANUAL MODEL: MBM-2105GIA (MC-3 CHA=W B GoldStar[...]

  • Page 2

    FEATURES l 2000 display characters in a 8 x 8 dot format. l 18 MHz bandwidth, medium class, composite signal input. l This monitor is compatible with a variety of home and personal computers CONTROLS LOCATION The MBM-2105GIA monochrome monitor uses a RCA jack connector. The input signal is input through the RCA jack connector. The input signal is b[...]

  • Page 3

    CIRCUIT DESCRIPTION 1. VIDEO AMPLIFIER 2. POWER SUPPLY The Fig. 3 details the cascade video amplifier. Video amplification is provided by the TR303 and TR304. TR303 and TR304 are connected in a cascade configuration. TR303 operates as a common emitter and TR304 operates in the common base configuration. This minimized the miller effect input capaci[...]

  • Page 4

    Vertical Oscillator F,B) vcc 2 Vetical Frame Vcc 2 Generator 1 Oscillator 1 Frame-Synchro Generator Line Fly Back Phase Input Detector Horizontal Oscillator Vertical output Power Amplifier Input Horizontal output Figure 4, BLOCK DIAGRAM OF THE TEA 2037A 3. COMPOSITE VIDEO INPUT AND HORIZONTAL/ VERTICAL DEFLECTION 3-l VIDEO INPUT (PIN 15) 3-3 The de[...]

  • Page 5

    ADJUSTMENT 1. REGULATED B + ADJUSTMENT (VRSOl) Connect high impedance voltmeter between TR901 emitter and ground rotate the B + adjustment control (VR901) to obtain a reading of 12.0 2 O.lV. 2. FOCUS (VR704) Adjust the focus control (VR704) for best overall focus of the test pattern (marked with the symbol “%“). Usually the center and corners o[...]

  • Page 6

    - I - ! - 4 - 3 - 2 - 1 SCHEMA1 CONTRAST VR301 5008 t- c905 0901-0904 2200/2! lN5392GP.4 1 F901 20.6 T750mA 25OV A IUL/CSAI 1315mA25OV NDE/SEtlKOI TR902 12.7 Kltl959-O/Y C908 R602 15 H.V OEFL ..- +y-+$ll.2 TEA2037 MnJ%- 4th H.HOLD u R705 VR702 33K b.lK 12Ul I NOTES: 1. RESISTORS ARE SHOWN IN OHMS K = 1.000 M = 1.000.000 2. CAPACITORS ARE SHOWN IN U[...]

  • Page 7

    DIAGRAM 3OvI+ IHI / N-i 23VI-r IV1 9lOKGB3UGREENl mKGB4*wmENl 9lDKMUBLACK/WHTE) 9lDKGB 39 IYELLOWISH GREEN1 /- 5OVP-P M/VI - H.LW. 0 ; RltO b7K VR703 R7K 1ooK BRJT. R7u 33K R711 l5K R7Y 6.Y 070) cm RGPlOD lw/ 100 ‘? 01G.h R719 : vR705 2sOKn EXT. BRIT f ;;,2 ,/,6ti cn@ FBT &l/l5 7701 A , * I 1 c717 R7OI 1 1 OwLI/ L.wv loowl tl.OUl c708 3 20 L.[...]

  • Page 8

    TROUBLESHOOTING GUIDE TR902, TR903. D905. TR901 AND POWER REG CIRCUIT ~. 7 I D706, c713. c714. c715 YES , CHECK CRT (GZ) VOLTAGE 450V NO TROUBLE IN 2 CHECK CRT (HEATER) VOLTAGE 12V -, FBT. CR706 R712 LEAD (HI,. LEAD (Vl, V2) YES CHECK CRT CATHOD VOLTAGE ABOVE 55V TROUBLE IN * 45-55v TR303, TR304. R311. R309. R310. R315, R314, R312 YES VR703 (SUB-BR[...]

  • Page 9

    PRINTED CIRCUIT BOARD 1. MAIN PCB ASSY PIN: 1 lo-BOW ASSY PIN: ilO-B72A J GSEP-2112 TI BLACK[...]

  • Page 10

    3. MAIN PCB (SOLDER SIDE) 4. LINE FILTER PCB (SOLDER SIDE) O-0 Lsol I[...]

  • Page 11

    EXPLODED VIEW REPLACEMENT PARTS LIST (MECHANICAL PARTS) 8 , 1ILr.I w 9 1 3X3-A02A 1 COVER ASSY. B& ___ .- 10 407-622A 11 407.696A , I-LAIE., “x-t WNR ruvvcn, 12 303.924A 1 COVER, CRT BOARD I 13 303.928A [ COVER, PCB SHIELD CASE 1 *Outer Cabinet not used on 6300T Models. C D I E I F[...]

  • Page 12

    REPLACEMENT PARTS LIST CAUTION: Components identified by the A symbols in the PARTS LIST and on the SCHEMATIC DIAGRAM have special characteristics important to safety. Do not degrade the safety of the set through improper servicing. ABBREVIATIONS: Capacitors . . . . CC: Ceramic (TC), CE: Chemical, CK: Ceramic (Hi-K), BP: Bipolar, CQ: Mylar, PE: Pol[...]

  • Page 13

    REF. NO. PART NO. DESCRIPTION REMAR C608 CE. 2 2uF 160V R c701 CE. 1OOuF 16V R C702 CO, 0 1uF 1OOV s c 703 CE. 1 OuF 25V R c704 CO, 0 0022uF 1OOV R c705 PP 0 0022uF 200V S C 706 CO, 0 0022uF 1OOV R c707 CQ. 0 015uF 1OOV R C708 CE, 4 7uF 25V R A C709 PP. 0 027uF 400V s CT10 CE, 47OuF 25V R (1711 CE. 22OuF 16V R c’712 BP. 4 7uF 25V S C713 CE, IOOuF[...]