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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!
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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
3.2
Troubleshooting
Feed section
Is the voltage output at IC621 pin "40" 5V or 0V? YES Is 4V present at both sides of the feed motor? YES Check the feed motor. NO Is 6V or 2V present at IC681 "16" and "17"? NO Check IC681. NO Is the wiring for IC621 pin "40"? NO YES Is 3.3V present at IC681 pin "6"? YES Check the vicinity of IC621. YES Check the feed motor connection wiring. Check CD 8V and 5V. NO
Focus section
When the lens is moving: 4V
Does the S-search waveform appear at IC681 pins "13" and "14"?
NO
Check the circuits in the vicinity of IC681 pins "13","14"and"1". YES
YES
Check the pickup and its connections
Spindle section
Is the disk rotated? YES Does the RF signal appear at IC601 pin "19"? YES Is the RF waveform at IC601 pin "19" distorted? YES Proceed to the Tracking section NO Is 4V present at IC681 pins "15" and "16"? YES Check the spindle motor and its wiring NO Check the circuits in the NO vicinity of IC601 pin "19" or the pickup NO Is 4V present at IC621 pins "41" ? YES Check the vicinity of IC681. NO
Check the circuits in the vicinity of IC621 or IC621
Tracking section
When the disc is rotated at first:
YES
Approx. 1.2V Is the tracking error signal output at IC601 "11"?
Check the circuit in the vicinity of IC601 pins "2" to "7".
YES
Check the pickup and its connections
YES Check IC621.
(No.49839)1-25
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