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The manual was very clear and contained all the information I was looking for. My dishwasher is working again because of this servicemanual!
Quality scan, great manual. I solved my problem with this manual.
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.
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!!!!
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
Flow of functional operation until TOC read
Slider turns REST SW ON.
Confirm that the voltage at the pin5 of CN705-1 is "H"\"L"\"H".
Automatic tuning of TE offset
Check that the voltage at the
pin40 of IC701 is + 5V?
Detection of disc
Automatic tuning of Focus offset Confirm that the Focus error S-cuve signal at the pin32 of IC701 is approx.2Vp-p Confirm that the signal from pin24 IC701 is 0V as a accelerated pulse during approx.400ms.
Automatic measurement of Focus S-curve amplitude
Disc is rotated
Tracking error waveform at TOC reading pin 20 of IC702(TE)
Approx. 1.8V VREF
Focus servo ON (Tracking servo ON)
Automatic measurement of Tracking error amplitude
Tracking Disc to be servo braked to stop on states Disc states TOC reading to rotate finishes Automatic measurement of TE amplitude and automatic tuning of 500mv/div 2ms/div Fig.1 TE balance Tracking servo off states
Confirm the waveform of the Tracking error signal. at the pin 20 of IC702 (R705) (See Fig.1)
Automatic tuning of Tracking error balance
Automatic tuning of Focus error balance
Automatic tuning of Focus error gain
Automatic tuning of Tracking error gain
Confirm the eye-pattern at the lead of TP713
Play a disc
Complete owner's manual in digital format. The manual will be available for download as PDF file aft…