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Home >> ROADSTAR >> 12.7 CHASSIS Service Manual
 
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ROADSTAR 12.7 CHASSIS
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of ROADSTAR 12.7 CHASSIS Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 12 (click to view)
2.3 Screen Adjustment • • • • • Switch on the Service Menu with the Service RC and press “Yellow” teletext button. Find item “SCRN” in the menu. Apply color bar pattern For 14” sets: Adjust the Screen potentiometre until the voltage across the pin of R727 (that is connected CRT cathode) and ground is 139±3 VDC. For 20”-21” sets: Adjust the Screen potentiometre until the voltage across the pin of R727 (that is connected CRT cathode) and ground is 164±3 VDC (For 20”Ekranas CPT, adjustment value is154±3 VDC ) Exit from the service menu with the Service RC.

2.4 White Balance Adjustment • • • • • • • Apply a white pattern with a pattern generator to the antenna input. Enter the Service Menu with the Service RC and and press “Yellow” teletext button. Select “B.DRV” option with P+ / P- buttons and change its value to “32” with V+ / V- button. Adjust “R.DRV” and “G.DRV” for white balance. Adjust “R.CUT” and “G. CUT” for red and green cut off (There is no blue cut off adjustment). If white balance can not be adjusted properly change “B.DRV” value. Exit from Service menu.

2.5 Geometry Adjustments • • • • • • • • • • • Apply the cross hatch pattern with a pattern generator to the antenna input. Enter Service Menu with Service RC and press “Green” teletext button. Adjust Vertical Amplitude with “V.4:3” option. Add 18 to ““V.4:3” value and change “V.16:9” to this value. Adjust vertical position with “V.POS”, vertical linearity with “LNRTY”, horizontal position with “H.POS”. Substract 14 from “V.4:3” value and change “V1. 60” to this value. Add 4 to “V.4:3” value and change “V2. 60” to this value. Set “VP.60” to the same value of “V.POS”. Set “LN.60” to the same value of“LNRTY” . OSD window position can be centered on the screen with “OSD.H” and “OSD.V”. Exit from the Service Menu.

Note that: There is no horizontal width adjustment in this chassis. It can be adjusted by changing power supply voltage in the interval of -1 and +1 V. 2.6 Feature Setup Enter the Service Menu with the Service RC and and press “Red” and “Blue” teletext button. Check that below features match with the set. TUNER : Phillips, Sharp&Alps, Panasonic, Temic ST.BY : YES (Default, Automatic switch off is active), NO (can be used during repair) AV2 : YES (Front AV is available), NO CLR.S : PAL, PAL/NTSC3.5 (+NTSC Playback), PAL/SECAM, PAL/SECAM/NTSC3.5 (NTSC Pback) SND.S : BG, I, BG+DK, BG+LL’ QSS/I : INTERCARRIER, QSS TEXT : NON TEXT, DEFAULT (Teletext), FASTTEXT LANG : A (West Europe), B (East Europe) HOTEL : NORMAL TV, HOTEL TV RGBIN : YES (When Scart RGB exists, aerial isn’t showed–for only for some Hotel TVs), NO (Default) APR : ON (Auto RGB level control is available) , OFF B.STR : ON (Black level control is available), OFF ATS : YES (Automatic tuning system is on), NO AVL : YES (Automatic Volume Limiter is on), NO ZPG : YES (Timer Programmed channel switching function is on), NO ZAPP : YES (One button channel switching function is on), NO

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