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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+++++++++++++++++++++++++
SECTION 1 SERVICING NOTES
This set detects the rotation of the idler gear (A) (side S) using the PH701 (photo reflector). The PH701 is mounted on the MAIN board, therefore the idler gear (A) (side S) cannot be detected with the MAIN board removed. As a result, the motor (M901) cannot be controlled, causing malfunction. Further, the DIRECTION switch (S701) is also mounted on the MAIN board, and with the board removed, the mechanism position cannot be detected and the operation is not changed over. Therefor, when the voltage check is executed with the MAIN board removed, follow the procedure provided below. 1. Setting (1) Refer to �3. DISASSEMBLY�, and remove the MAIN board. (2) Connect the MAIN board to the motor (M901) and the plunger (PM901) using jumper wires. These can be connected easily with the use of the extension tool (Part No. 1-769143-11) (ten in one set). (3) Short the TAPE DETECT switch (S901-1) terminals and the ATS switch (S901-2) terminals. (4) Connect the AF oscillator to the TP53 (P. IN) and the TP14 (GND). (5) Supply 1.3 V to the battery terminals using the regulated power supply. 2. Preset state To set the PLAY, FF, REW modes, the preset state must be set. (1) Check that the slider (NR) and the DIRECTION switch (S701) are set to the center position. If not, set the preset state as follow. (2) Move the DIRECTION switch (S701) to the side, which the slider (NR) is facing. (3) The slider (NR) will move when the regulated power supply switch is set to OFF once and then set to ON. Move the DIRECTION switch (S701) according to this timing and set to the center position.
� MAIN Board (side B) � TAPE DETECT (S901-1) ATS (S901-2) connect to the plunger (PM901) battery terminal � FF AMS (S704) square wave AF oscillator battery (sine wave) terminal � 10 Hz, � 3.5 dB
+ �
3. FF, REW modes (1) Check that the preset state is set. (2) Input the square wave or sine wave to the TP53 (P. IN) and the TP14 (GND). (3) Press the p button (S702) to set the STOP mode. (4) Press the [FFÂ AMS] button (S704) or the [REWÂ AMS] button (S705). 4. PLAY mode (1) Check that the preset state is set. (2) Input the square wave or sine wave to the TP53 (P. IN) and the TP14 (GND). (3) Press the p button (S702) to set the STOP mode. (4) Press the [Â Â Â Â Â Â Â Â Â Â Â Â Â REPEAT] button (S703) will move the 9( slider (NR) once towards the side R and then to the side F. Move the DIRECTION switch (S701) according to this timing will set the PLAY mode (side F). Press the [Â Â Â Â Â Â Â Â Â Â Â Â Â REPEAT] button (S703) another time and move 9( the DIRECTION switch (S701) according to the movement of the slider (NR) will set the PLAY (R mode).
Note 1: If the above fails, perform from preset again. Note 2: Use the [Â Â Â Â Â Â Â Â Â Â Â Â Â Â REPEAT] (S703), p (S702), [FFÂ AMS] 9( (S704), and [REWÂ AMS] (S705) buttons on the remote controller as much as possible. If no remote controller, do not touch the buttons with your hands, but using a stick with a round tip. Note 3: When using headphones, the timing for move the DIRECTION switch (S701) can be determined from the beep sound.
TP53 (P.IN) PH701
� REPEAT (S703)
REW AMS (S705)
p (S702)
S701 DIRECTION FWDNSTOPnREV TP14 (GND) connect to the motor (M901)
�3�
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