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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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CD TEST MODE
1. How to activate CD test mode 1) Remove the resistor R907 (100k�) from the MAIN C.B, and add R999C 22k� or chip resistor to the MAIN C.B. (Fig. 1) 2) Connect +12V to ACC/BACK UP and � (minus) to the ground of the CONNECTOR ASSY. 3) Turn on the power. 4) Test mode will be activated and all LCD display will light up. (Fig. 2) 3. CD test mode functions Mode Start Mode Operation Key LCD Display All LCD light up DISC LOADING Operation Contents Activate test mode � Loading � All servo off � Laser on � VCC on � Continual focus search � Check APC circuit Search Mode RANDOM (The pickup lens repeat the � Laser current measurement full-swing) � Check focus error waveform * NOTE 1 � TOC reading � Normal playback Play Mode Fig. 1 REPEAT 1 � Display Track No. and Play time � Display Level/Ing. � Same operation as search mode if TOC cannot be read � SLED servo Traverse Mode Stop Mode INT REPEAT � Display Track No. and Play time All LCD light up Playback pause status Wait status Tracking servo off � All servo off � Laser on/off � Pickup moves to outer track Sled Mode All LCD light up � Pickup moves to inner track � Check mechanism operation � Sled servo � Tracking servo � CLV servo � Focus servo
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UNLOADING DISC CHUCKING
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� Do not insert the CD disc when checking the search mode. � Press the REPEAT key to release each mode. Fig. 2 2. How to cancel CD test mode 1) Turn off +12V to ACC/BACK UP 2) Solder back the resistor R907 (100k�) and remove the R999 (22k�) from the MAIN C.B 3) Disconnect +12V from ACC/BACK UP and � (minus) from the ground of the CONNECTOR ASSY. * NOTE 1 : There is a case that the CD cannot be operated owing to the protection circuit being operated when heat builds up in the driver IC if the focus search is opereated continually for more than 10 minutes. In this case, the power supply should be switched off for 10 minutes until the heat has been reduced and then re-start.
� 28 �
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