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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+++++++++++++++++++++++++
FLOW CHART NO.10 FLOW CHART NO.9
The cassette tape fails to eject. No power is turned on.
See FLOW CHART NO.11.
pin(76) of IC701 change from "L" to
Does the capstan motor start when NO Check IC701. the EJECT button is pressed? "H" level?
NO Does power control(H) signal at
YES YES
NO take-up turn when disk reel drive unit. Does base of Q961 change from NO Check IC701 and all the way up thru YES
the capstan motor is running? about 0V 5.7V? to Q961.
way up thru to IC701.
Q961?
YES
Check take-up reel sensor and all the NO Is 5V sent out the emitter of Are pulses applied at pin(2) of IC701 Check Q961 and the AT 5V line. when the take-up reel disk is turning?
YES
Does pin(10) of P701 go from 2.5V NO to 0.8V when reel pules has been
Check peripheral circuits for poor
Check pin(72) of IC701. soldering.
input.
YES
Does the motor run? Replace loading motor. FLOW CHART NO.11
NO
YES The capstan motor fails to run.
Replace cassette cam, gear, etc.
39
Is the voltage more than about 2.6V NO DC given out pin(24) of IC701. pin(3) of P701.
NO
Check IC701.
YES NO Is the supply voltage of 5V feed to
Check PC 5V line.
YES
Check between pin(9) of P701 and Is the voltage more than 2.6V DC all the way up thru to pin(24) of sent in pin(9) of P701. IC701.
YES
Check between the pin(71) of IC701 Is the voltage at pin(5) of P701 NO and all the way up thru to pin(5) of 3.5V? P701.
YES NO Check motor-VCC line and motor
Is the supply voltage of 23V feed to voltage selector circuit. pin(2) of P701. YES
Replace capstan motor.
VC-A433M/H833M
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