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The AKAI 1720 model reel to reel tape recorder described in this Manual is quite an old unit - circa late 1960's. As a consequence, the description of the mechanical details - and adjustments thereof - is quite critical. The manual does this quite well. The schematics are also well presented and have detailed PCB overlays. Probably the only negative is that some half-tone detail has been lost from the original manual as it has been scanned in simple B&W.
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Perfect source for service manuals: fast and professional transaction; high quality, perfect readable and largely scaleable PDF; complete schemes, diagrams and spare part list. Tnx a lot, cu again!!!!
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
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Excellent printing quality.
A complete and very usefull service manual with all details.
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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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