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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+++++++++++++++++++++++++
DV-SP406 CIRCUIT VOLTAGE CHART-2
MODE PIN NO.
221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
STOP
1.617 2.261 1.617 0 1.619 1.617 1.616 3.286 3.286 1.618 1.616 0.003 3.286 1.841 0.002 0.003 1.841 0.871 0.887 1.071 1.035 0.002 3.202 1.636 0.321 1.986 0.221 3.259 0.002 3.259 0.691 1.375 3.236 1.368 0.002 1.723 1.392 2.326 0.883 1.468 1.247 0.299 2.478 2.767 0.012 0.021 3.274 3.266 3.268 3.268 1.204 0.014 0.102 2.006 1.114 2.285 1.698 1.953 1.891 1.964 2.087 0.012
PLAY
1.615 2.249 1.613 0 1.611 1.611 1.61 3.249 3.248 1.614 1.611 0.003 3.249 1.827 0.002 0.003 1.827 0.868 0.868 0.864 0.822 0.002 3.179 1.641 1.549 1.543 1.517 3.244 0.002 2.243 1.711 1.366 1.424 1.788 0.002 1.718 0.118 0.339 3.065 0.338 3.163 0.619 1.645 1.648 0.014 0.014 3.242 3.239 3.244 3.244 0.776 0.015 3.085 1.765 1.354 2.265 2.084 2.118 1.945 2.175 1.869 0.014
MODE PIN NO.
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
STOP
0.002 0.012 1.376 0.528 1.706 0.436 0.961 0.441 0.588 0.365 3.267 1.383 0.432 1.505 0.413 1.637 0.447 1.339 2.012 0.001 0.001 0.014 3.281 1.264 3.281 1.154 1.145 0.002 1.504 1.005 3.281 1.003 0.843 0.002 0.968 3.284 2.316 3.181 3.022 3.098 2.856 1.485 1.679 0.039 0.411 2.076 2.318 1.384 3.279 0.002 1.511 1.543 1.651 1.705 0.054 0.087 0.033 0 3.271 1.518 2.316 0
PLAY
0.001 0.013 1.561 0.202 1.766 0.775 1.188 0.587 1.134 0.729 3.241 1.442 1.291 1.536 0.847 1.527 1.028 1.142 1.846 0.001 0.001 0.026 3.239 1.141 3.239 1.055 1.077 0 1.021 1.241 3.241 1.069 0.633 0 0.782 3.241 1.389 3.001 2.748 2.934 3.239 1.233 1.229 0.097 0.715 1.238 1.775 1.507 3.241 0.001 1.381 1.649 1.539 1.508 0.084 0.083 0.036 0 3.246 1.462 1.538 0
MODE PIN NO.
41 42 43 44 45 46 47 48 49 50 51 52 53 54 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2 3 4 5
STOP
0.002 1.339 3.278 1.117 1.217 0.002 1.231 1.473 3.279 1.742 1.786 0.002 0.828 0.002 0.002 0.002 0.002 0.002 3.285 3.285 0.002 3.289 3.283 0.026 3.287 2.929 0.001 4.911 0.022 0.022 3.286 2.448 2.448 2.442 4.89 0.002 0.346 3.283 4.859 2.284 2.436 1.851 4.861 1.847 0.014 2.282 2.255 0.003 2.245 2.229 1.961 1.945 1.901 2.231 5.57 5.57 5.57 0.001 5.57
PLAY
0.001 0.796 3.267 0.885 1.009 0 1.144 0.745 3.267 1.127 1.281 0.001 1.051 0.001 0 0 0 0 3.252 3.251 0 3.252 3.247 0.024 3.251 2.909 0.001 4.88 0.025 0.025 3.253 2.439 2.437 2.434 4.89 0 0.346 3.246 4.83 2.276 2.427 1.786 4.84 1.691 0.013 2.271 2.271 0.003 2.252 2.239 1.729 1.727 1.701 2.242 5.54 5.54 5.54 0.001 5.54
MODE PIN NO.
6 7 8 Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base Drain Gate Source Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base Emitter Collector Base
STOP
5.57 5.57 12.21
PLAY
5.54 5.54 12.13 3.266 0.034 3.221 3.039 2.328 2.305 0.002 4.887 0.019 0.001 0.179 0.022 0.001 0.001 4.839 1.705 1.886 2.461 3.271 3.093 4.912 0.001 0.002 0.667 3.257 3.115 3.247 0.001 0.003 0.671 0.002 0.083 0.727 0.001 0.081 0.728 0.001 0.035 0.727 2.254 4.86 2.902
Q201
3.297 0.384 3.237
Q202
3.301 0.385 3.242
Q205
0 0.008 0.651
IC606(S524C80D80-SCB1)
Q206
0 0 3.234
Q207
0 0 0.008
IC603(HY57V64)
IC607(CS5340)
Q208
1.751 1.885 2.482
Q601
3.296 3.107 4.912
Q702
0.001 0.005 0.716
Q703
3.269 3.239 2.558
IC602(ES29LV160ET)
Q705
0.001 0.005 0.726
IC701(MM1692XVBE)
Q706
0.002 0.082 0.729
Q707
0.001 0.085 0.728
Q708
0.001 0.034 0.728
Q709
2.271 4.86 2.921
IC703(MC4580)
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