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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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SECTION 4 MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened swab : record/playback/erase head pinch roller rubber belts capstan idlers 2. Demagnetize the record/playback/erase head with a head demagnetizer. (Do not bring the head demagnetizer close to the erase head.) 3. Do not use a magnetized screwdriver for the adjustments. 4. After the adjustments, apply suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the rated power supply voltage unless otherwise noted. Torque Measurement Mode FWD CQ-102C FWD Back tension REV CQ-102RC REV Back tension FF, REW CQ-201B Torque Meter Meter Reading 35 � 80 g � cm (0.49 � 1.11 oz � inch) 1 � 7 g � cm (0.012 � 0.097 oz � inch) 35 � 80 g � cm (0.49 � 1.11 oz � inch) 1 � 7 g � cm (0.012 � 0.097 oz � inch) more than 40 g � cm (more than 0.56 oz � inch)
SECTION 5 ELECTRICAL ADJUSTMENTS
PRECAUTION
1. The adjustment should be performed in the publication. (Be sure to male playback adjustment at first.) 2. The adjustments and measurement should be performed for both L-CH and R-CH. � Switch position DOLBY NR switch : OFF DIRECTION switch : A Standard Input Level Input terminal source impedance input signal level Standard Output Level Output terminal load impedance output signal level Test Tape Type P-4-A100 P-4-L300 WS-48A Signal 10 kHz, �10 dB 315 Hz, 0 dB 3 kHz, 0 dB Used for Azimuth Adjustment PB Level Adjustment Tape Speed Adjustment TAPE OUT (L-CH) 47 k� 0.49 V (� 4 dB) TAPE IN 10 k� 0.49 V (� 4 dB)
0 dB = 0.775 V
� 13 �
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