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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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This was the Sony CCU-500A Service manual I was looking for.
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Excellent printing quality.
A complete and very usefull service manual with all details.
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A+++++++++++++++++++++++++
CD TEST MODE
1-1 How to Activate CD Test Mode 1) Connect 62 pin (test) of IC701 (LC72358N-9910) on MAIN C.B to the 31 pin (VDD) by cable. Caution when servicing (1) How to use extension jig. Correct between MAIN C.B. and CD mechanisms by extension jigs when checking CD mechanism (TN-CCD1001-113J) operation. (Refer to the following figure.)
2) Connect wire of ACC (red) and BACKUP (yellow) of power supply/speaker connector to DC+12V, then connect Ground (black) to -. When CD test mode is started, all displays will be lighted as shown in the following figure.
1-2 How to cancel CD Test Mode 1) Disconnect the cable of 62 pin (test) and 31 pin (VDD) of the MAIN C.B IC701 (LC72358N-9910) and switch on the power. 1-3 CD Test Mode Functions MODE Keys to operate Start Mode Search Mode RANDOM Display All lightented TOC READING Operations � Continual Focus Search (The pickup lens respeats the full-swing up-down motion) * NOTE 1 � Normal Play Back � Focus search is contiuned if TOC cannot be read � Pause Status Contents � Start TEST MODE � Confirm APC circuit � Laser current measurement � Confirm focus error waveform � Focus servo � Traking servo � CLV servo � Sled servo � Traking servo OFF Parts Description AKC-JIG Parts Number SV-J00-075-010
Play Mode
REP 1
Traverse INT Mode Thread Mode
TRACK No. Playing Time Indication Revel/Ing Indication Track no. & Playing Time Indication All lightened
� Pick up Move to outer most track � Thread servo � Pick up Move to inner most track � Confirm mechanism operation
Gain Switch
1 (Preset Button)
All lightened
� Step 1 : For CD/CD-R � Step 2 : For CD-R RF Gain is up against Step 1 � Step 3 : For CD-R Laser Power Up against Step 2
� Step 1 to 3 are cyclic � �Error 03� is indicated if the Disc does not Step 1 match.
� Do not insert a Disc when confirming Search Mode � Press PWR button when cancelling Search Mode. Test Mode will be restored when PWR button is pressed once again. � Insert the �Test Disc� when operating all modes except search mode. * NOTE 1 : There are CD operations are disable owing to the protection circuit being operated when heat builds up in the driver IC if the focus search is operated continually for more than 10 minutes. In cases, the power supply should be switched off for 10 minutes until heat has been reduced and then re-started.
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