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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.
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Excellent printing quality.
A complete and very usefull service manual with all details.
GREAT SERVICE AT VERY LOW PRICE!
A+++++++++++++++++++++++++
CD-C831W
� Playback can only be performed when a disc is loaded.
Is the Focus servo active? (Can you hear it working?) Yes Yes Does the DRF signal change from "L" to "H"? Yes Yes Is HF waveform normal (see the Fig.37-1, 2)? Yes Check the tracking system. Waveform is unstable.
0.5s 1.00 V IC1 16 FD 0.5s 10.0 V IC2 13 CLV+ 0.5s 10.0 V IC1 54 DRF 0.5s 2.00 V IC1 7 TE 2 1 3 4
No
Check the laser diode driver. Check the area around IC1(16) - (21) (focus servo circuit).
No
If the disc is not turning, the DRF should not change to "H".
Check the spin system.
No
Level is abnormal. Yes
Check the periphery of IC1 pins 41 and 42.
Check the spin system.
Waveform in case of normal play-back
HF 1.0V/DIV 0.5µsec/DIV(DC) IC1 41 (When playing back the disc)
Figure 37-1 � Check the tracking system.
Figure 37-2
Check waveform of IC1 pin 7 (TE). The waveform shown in Fig. 37-3 appears, and nodisc state appears soon. Tracking servo is inoperative. Yes Check the periphery of IC 1 pin 8 to pin 15, and IC 3 to CNP2.
Yes
Play is possible in TEST mode.
Yes
The unit will be initialized in Normal mode,but it will not Yes playback.
Normal jump is impeded, and the program top Yes cannot be reached.
Check the periphery of IC 1 pin 14.
Data cannot be read.
Yes
Check the VCO-PLL system.
5ms 1.00 V IC1 7 TE
4
5 ms 5.0 V IC1 54 DRF
3
Figure 37-3 � 37 �
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