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Quality scan, great manual. I solved my problem with this manual.
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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.
3. Y/C CIRCUIT (2) When the Y(Luminance) signal doesn�t appear on the screen in PB Mode,
Is 5V applied to the IC301 Pins23, 44, 45, 52, 68, 77? YES Is the Y/C Bus siganl applied to the IC301 Pins53, 54, 55? YES Does the normal RF signal NO appear at the IC301 Pin 14? Is the V.H.S/W signal NO applied to the IC301 Pin57? YES Does the Rectangular waveform(5V) appear at the IC301 Pin57(V.H.S/W) YES NO Check the V.H.S/W level. Check the System Circuit. (IC501 Pin18) NO Refer to �SYSTEM Y/C BUS CHECK Trouble Shooting�. NO Check the line of the REG 5V Line. (Power Circuit)
YES
Clean the Drum.
Does the Y(Luminance) signal appear at the IC301 Pin20? YES
NO
Check the R328, C322, C323.
Is the Y(Luminance) Video NO waveform showed up at the IC301 Pin22? YES Replace the IC301.
Check the C324.
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