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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!
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11 Schematic Diagrams
11-1 Cautions
1. The areas marked with a ! , or on the schematic diagram designate components which have special characteristics important for safety. Replace these parts only with parts identical to those in the original circuit and those specified in the parts list. Before replacing any of these components, carefully read the �Product Safety Notice.� 2. Areas marked with a on the schematic diagram designate controls which have been sealed for safety during manufacturing. If these controls need adjustment, they must be replaced with new controls and then sealed after their adjustment. 3. When taking measurements, pay special attention to the following: 1) Do not use your instrument between primary ground (symbol 2) Do not use your instrument between secondary ground (symbol ) and secondary circuit. ) and primary circuit.
11-2 Notes
1. Resistance is shown in OHM. K = 1,000, M = 1,000,000 and the rated power of resistors not noted in the schematic diagram is 1/4W. 2. Capacitance is shown in µF. Capacitances not otherwise noted are shown in pF (1µF = 1,000,000 pF). Rated voltage of condensers not otherwise noted in the schematic diagram is 50 V.
11-3 Abbreviations and Symbols
MO FU CM MP P R-Metal Oxide Fusible R-Cement C-Metalized Polyester C-Polyester Hot Ground Electrostatically Sensitive Device (ESD) ! WW C MPP T R-Wire Wound R-Composition Metal Polypropylene C-Tantalum Can emit X-radiation Cold Ground Provides special safety considerations
1. The secondary voltage is read with an SSVM from the indicated point to a cold ground ( ). The primary voltage is read with an SSVM from the indicated point to a hot ground ( ). 2. This schematic diagram is subject to change without notice.
CKB5237L/7227L
11-1
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