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The manual was of good quality with high resolution schematic diagrams.
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The manual was very clear and contained all the information I was looking for. My dishwasher is working again because of this servicemanual!
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Quality scan, great manual. I solved my problem with this manual.
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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!!!!
DV-340, DV-343
15. Disc distinction threshold value (CD and unrecorded disc) Threshold value of the disc distinction. Distinguish it from CD if bigger than this value, and distinguish it from an unrecorded disc if small. 16. Current jitter value Indicate the value that was read in from the MY-CHIP in DVD, and indicate the value that was read in from the servo DSP in CD. 17. Focus balance setting value of L0 18. Focus balance setting value of L1 19. Current mechanism controller inside mode (it does not support in this unit) It can indicate to a maximum 10 modes. Indicate only a nest share of the mode. 20. Processing step of 11 inside modes (it does not support in this unit) It can grasp the current mode, the mode reaching it and transition of step by watching 19 and 20. 21. Spindle control state of MY-CHIP (it does not support in this unit) OFF : Motor off condition A/B : Accelerator and brakes FG : FG servo RVP : Rough speed phase servo ORVP : Rough speed phase servo of offset addition 22. Rotation number of spindle motor Do not FG read in ? indication (during spindle stop). 23. Tracking error generation system (it does not support in this unit) 1: 1 beam (DPD) 3: 3 beams 24. TZC count value (it does not support in this unit) The value that counted the number of TZC for one rotation in the tracking open state. When this value is more than 512 with CD, set it in 1 beam because the eccentric is large. DVD does not measure it because it is 1 beam fixed (indication is 0000). 25. It indicates the frequency that entered the focus backup Hexadecimal number indication. Counter does not reset till turns the power off after turning it on. Due to a 1 byte counter, next of FF becomes 00. 26. It indicates focus backup limit frequency with the hexadecimal number Initial value is 14H, it does decrement whenever enter the focus backup and it gives up backup if it became 0. Then the error is generated. After reverted from the backup, When not enter the backup and pass fixed time (1500ms), return to initial value again.
27. It indicates the frequency that entered the internal circumference plunging into backup of the sled Hexadecimal number indication. Counter does not reset till turns the power off after turning it on. Due to a 1 byte counter, next of FF becomes 00. 28. It indicates the frequency that entered the tracking overrun backup Hexadecimal number indication. Counter does not reset till turns the power off after turning it on. Due to a 1 byte counter, next of FF becomes 00. 29. It indicates the limit frequency of tracking overrun backup with a hexadecimal number Initial value is 03H, it does decrement whenever enter the tracking overrun backup and it gives up backup if it became 0. 30. It indicates the frequency that entered sled overrun backup Hexadecimal number indication. Counter does not reset till turns the power off after turning it on. Due to a 1 byte counter, next of FF becomes 00. 31. It indicates the limit frequency of sled overrun backup with a hexadecimal number Initial value is 03H, it does decrement whenever enter the sled overrun backup and it gives up backup if it became 0. 32. It indicates the frequency that entered the tracking close NG backup Hexadecimal number indication. Counter does not reset till turns the power off after turning it on. Next of FF is be a 1 byte counter in 00. The hexadecimal number indication which indicates the frequency that reads 33. ID/subQ, and entered NG backup Hexadecimal number indication. A counter does not reset it till cuts it off after turning it on. Due to a 1 byte counter, next of FF becomes 00. 34. An address to indicate in 35 Set it by using RS232.I (an address) Set it with DA. 35. Contents of an address indicated in 34.
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