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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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I got your link from a friend and I must say that I am really satisfied with your service. Specially this B&O manual I didn't find anywhere on the web... but you could deliver it :-) . You deliver very fast and the copy is of good quality. So your webpage is bookmarked. Thanks
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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
The permission to download was quck.
I will use Owner-Manual.com for all my manual needs.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
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(3) Measuring the Vs voltage Margin and deciding the voltage
¤ Convert the signal of signal generator to the 100% Full Red signal. ¤� Turn the voltage adjusting knob of Vs DC power supply to the voltage -down direction and make the cell of screen turned off. ¤� Turn the voltage adjusting knob of Vs DC power supply to the voltage -up direction until the cell of screen turned on. The first voltage, which make the cell of full screen turned on, is named as Vsmin1 and record it. ¤� Turn the voltage adjusting knob of Vs DC power supply to the voltage-up direction slowly until the cell of screen turned off or over electric discharge. The first voltage, which makes the cell of screen turned off or over electric discharge, is named as Vsmax1 and records it. (Only, Vs voltage variable passes over the maximum 190V) ¤º Convert the signal of signal generator to the 100% Full Green signal. ¤ Repeat the adjustment (2) item and name each voltage as Vsmin2/Vsmax2 and record them. ¤ Convert the signal of signal generator to 100% Full Blue signal. ¤ Repeat the adjustment (2) item and name each voltage as Vsmin3/Vsmax3 and record them. ¤ Convert the signal of signal generator to 100% Full White signal. ¤ Repeat the adjustment (2) item and name each voltage as Vsmin4/Vsmax4 and record them. ¤æ Convert the signal of signal generator to 100% Full Black signal. ¤ Repeat the adjustment (2) item and name each voltage as Vsmin5/Vsmax5 and record them. ¤ At this time decided Vs voltage adds 6V to Max value(Vsmin1~Vsmin5) and set up the voltage within the set-up range(180V < Vs # 190V) in consideration of other features. ¤ Turn the voltage adjusting knob of Vs DC power supply make deciding the Vs voltage. ¤ı Adjust Vset-down wave form using setting up Vs voltage like mentioned on the 4-3.
(4) Adjusting the final voltage wave form
Check the voltage wave form like the mentioned way on the 43(How to adjust) and readjust the wave form when it is twisted.
(5) DC-DC Pack Voltage Set up Range
Vsetup : 185V ~ 225V Vsc : 90V ~ 120V -Vy : -60V ~ -80V
-8-
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