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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!
A+++++++++++++++++++++++++
Picture is not displayed (LED is lit)
Is the LED red or green? green Do the Fans rotate?
red
Is the voltage applied to pin ² (PAS) No of the Signal PWB correct? Yes
No
AC/DC Power unit
Yes
With J106 (AC/DC Power unit) disconnected, is the picture displayed?
No
² +5.6V ´ GND
AC/DC Power unit Yes DC Fan No low (0V)
Is the voltage of pin - (J104) on the AC/DC Power unit 5V?
Is Voltage of the pin - (PAS) on the Signal PWB high? high (5V) Signal PWB
Yes Are the voltages of pins ¯, ² (J103) on the AC/DC Power unit correct? Yes ¯ +165V ² + 70V ¬ GND Are the voltages of the DC/DC Power unit correct?
AC/DC Power unit
AC/DC Power unit
No
Is the voltage of pin ³ (J102) on the AC/DC Power unit correct? No Yes ³ +3V ´ GND AC/DC Power unit
No (1.5V)
Panel Module
Yes See page 6 Panel Module DC/DC Power unit
5
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