User's Manual

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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

GoldStar

Summary of content (13 pages)

PAGE 1
GolclStar MONOCHROME MONITOR MANUAL WTISERVICE ON BEFORE SERVICING THE CHASSIS, READ THE “SAFETY PREtXJTK)NS”, IN THIS MANUAL MODEL: MBM-2105GIA (MC-3 CHA=W B GoldStar
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FEATURES l l l 2000 display characters in a 8 x 8 dot format. 18 MHz bandwidth, medium class, composite signal input. This monitor is compatible with a variety of home and personal computers CONTROLS LOCATION The MBM-2105GIA The input signal is The input signal is Figure 2 shows the monochrome monitor uses a RCA jack connector. input through the RCA jack connector. based on the composite level. monitor controls on the front and rear panels.
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CIRCUIT DESCRIPTION 1. VIDEO AMPLIFIER 2. POWER SUPPLY The 120V AC line voltage is applied to the primary of the T901 where it is stepped down through the secondary winding to approximately 17V (AC). After passing through the bridge rectifier circuit and filter (C905) the regulated DC supply voltage is approximately 18V (DC). The 18V unregulated B+ voltage is applied directly to the collector of the B+ regulator (TR901).
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Vertical Oscillator 1 Vetical Frame Vcc 2 Generator F,B) vcc 2 Oscillator Generator 1 Vertical output Power Amplifier Input Frame-Synchro Horizontal output Line Fly Back Phase Input Detector Horizontal Oscillator Figure 4, BLOCK DIAGRAM OF THE TEA 2037A 3. COMPOSITE VIDEO INPUT AND HORIZONTAL/ VERTICAL DEFLECTION 3-l VIDEO INPUT (PIN 15) The detection level for negative sync pulse at the sync separation input (pin 15) is set at 1.6V.
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ADJUSTMENT 1. REGULATED B + ADJUSTMENT (VRSOl) 5. HORIZONTAL POSITION NR701) 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 of the screen do not focus at the same setting and a compromise must be made. 3.
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SCHEMA1 CONTRAST VR301 5008 - .- I - R602 15 ! H.V OEFL - +y-+$ll.2 4 TR902 Kltl959-O/Y 0901-0904 TEA2037 12.7 C908 c905 2200/2! lN5392GP.4 t- - 1 A F901 T750mA 25OV IUL/CSAI 1315mA25OV NDE/SEtlKOI 20.6 3 MnJ%H.HOLD u VR702 - 4th R705 33K 12Ul b.lK I 2 - u NOTES: 1. RESISTORS ARE SHOWN IN OHMS K = 1.000 M = 1.000.000 THE 2.
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DIAGRAM 3OvI+ 23VI-r IHI IV1 N-i / 9lOKGB3UGREENl mKGB4*wmENl 9lDKMUBLACK/WHTE) 9lDKGB 3 9 IYELLOWISH GREEN1 - 5OVP-P M/VI / H.LW. 01G.h R719 0 ; RltO b7K : R7K VR703 ;;,2 ,/,6ti cn@ FBT 7701 A f &l/l5 , * c708 L.7/50 _. R7u 33K BRJT. R711 l5K R7Y 6.Y I 1 R7OI 1 L.wv tl.OUl c717 OwLI/ loowl 1 vR705 2sOKn EXT. BRIT 1ooK cm lw/ 100 ‘? 070) RGPlOD !rl!JE 20 3 c7l4 o%ll !!z’ FOilIS l 1’05 5 c7l5 u3wl 0 .
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TROUBLESHOOTING GUIDE TR902, TR903. D905. TR901 A N D P O W E R REG CIRCUIT 7 ~. YES I D706, TROUBLE NO , C H E C K C R T (GZ) V O L T A G E 4 5 0 V -, 2 C H E C K C R T ( H E A T E R ) V O L T A G E 12V c713. c714. c715 IN FBT. CR706 R712 L E A D (HI,. L E A D (Vl, V2) YES C H E C K C R T CATHOD ABOVE VOLTAGE 55V * 45-55v TROUBLE IN T R 3 0 3 , TR304. R315, R314, R311. R309. R310. R312 YES VR703 (SUB-BRIGHT,, VI?,05 (MT B R I G H T , , TRW, R710. R711. TR302.
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PRINTED CIRCUIT BOARD 1.
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3. MAIN PCB (SOLDER SIDE) 4.
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EXPLODED VIEW REPLACEMENT PARTS LIST (MECHANICAL PARTS) 8 9 10 11 12 13 *Outer Cabinet not used on 6300T Models. D C I 1 3X3-A02A ___ .- , 1ILr.I w 1 COVER ASSY. B& 407-622A 407.696A 303.924A , I-LAIE., “x-t WNR ruvvcn, 1 C O V E R , C R T BOARD I 303.
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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: Polyester, PP: Polypropylene Resistors . . . .
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REF. NO. A DESCRIPTION PART NO. CE. 2 2uF 160V CE. 1OOuF 16V CO, 0 1uF 1OOV CE. 1 OuF 25V CO, 0 0022uF 1OOV PP 0 0022uF 200V CO, 0 0022uF 1OOV CQ. 0 015uF 1OOV CE, 4 7uF 25V PP. 0 027uF 400V CE, 47OuF 25V CE. 22OuF 16V BP. 4 7uF 25V CE, IOOuF IOOV CE, 1OOuF 1OOV CK. OOluF 1OOOV CC. 56pF 50V CO, 0 0047uF IOOV CK. 0 OluF 50V CK, 0 0047uF 50V CK, 0 0047uF 50V CK, 0 0047uF 50V CK, 0 0047uF 50V CE, 22OOuF 25V CK, 0 1uF 50V CE, 47uF 16V MPP.