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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.
KD-SC945
3.2.1 Feed section
Is the voltage output at IC541 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor.
NO
Is the wiring for IC501 pin 27? NO
YES Is 3.3V present at IC501 pin "20"? YES Check the vicinity of IC541. YES Check the feed motor connection wiring.
NO Check CD 8V and 5V.
NO
Is 6V or 2V present at IC501 "4" and "5"? NO Check IC501.
3.2.2 Focus section
When the lens is moving: 4V
Does the S-search waveform appear at IC501 pins "8" and "9"?
NO
Check the circuits in the vicinity of IC501 pins "8","9"and"15". YES
YES
Check the pickup and its connections
3.2.3 Spindle section
Is the disk rotated? YES Does the RF signal appear at RF test point? YES Is the RF waveform at RF test point distorted? YES Proceed to the Tracking section
NO
Is 4V present at IC501 pins "6" and "7"? YES
NO
Is 4V present at IC541 pins "41" ? YES Check the vicinity of IC501.
NO
Check the spindle motor and its wiring NO NO Check the circuits in the vicinity of IC501 "19"~ "24" or the pickup
Check IC541 and IC501.
3.2.4 Tracking section
When the disc is rotated at first:
YES
Approx. 1.2V Is the tracking error signal output at IC501 "11"?
Check the circuit in the vicinity of IC501 pins "2"~"12".
YES
Check the pickup and its connections
YES Check IC541.
1-26 (No.49833)
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