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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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This was the Sony CCU-500A Service manual I was looking for.
The price was reasonable.
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Excellent printing quality.
A complete and very usefull service manual with all details.
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A+++++++++++++++++++++++++
1.5 Image output stops during the operation. If the image output from the media in the DVD player stops during the operation, replace the DVD drive.
1.6 No sound or abnormal sound comes out from the speakers in the DVD player. If no sound comes out from the speakers in the DVD player, check the following: (1) Check for moving images on the LCD screen Check whether or not the image stops in halfway. If it stops, replace the DVD drive. (2) Check the operation of the DVD drive. Check whether or not the DVD drive works. If it stops, replace the DVD drive. (3) Check the connection of the speakers in the DVD player. Separate the DVD player into the top assembly and bottom assembly, and then check the connections of the speaker cables to the LCD PCB. Then check the LCD PCB to the main PCB. If the connection is loose, repair connection. If the connector has been connected firmly, replace the main PCB or speaker.
1.7 No image or sound comes out from the output If any image or sound is output from the TV connected by the AV cable, replace the main PCB. NOTE: Before this test, make sure the drive works.
1.8 No sound comes out from the headphones. If no sound comes out from the headphones, replace the main PCB.
1.9 No image or sound is output by the external input. If any image or sound is output by external input, replace the main PCB.
1.10 The DVD drive does not operate with the battery. (1) Check the operation with a good battery. Install a good battery and make sure the LED lights up orange while the AC adapter is connected. When the LED does not light up or blinks, check the connection of the battery connector inside the DVD player. If the connection is loose, repair connection. If the connector has been connected firmly, replace the main PCB. (2) Other than the above, replace the battery. NOTE: z For this check, use a battery which is not fully charged (because the LED does not light when the battery is fully charged.) z Before this check, make sure other function work correctly.
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