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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!!!!
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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
SECTION 2 TEST MODE
1. Circuit Check Mode Set to the reception frequency that the circuit can STEREO RDS stations. (Set the input level to above 70 dB.) This enables circuit check to be performed in any of the reception modes-FM, AM (MW, LW). Set to a desired band before setting the test mode. 1. Turn OFF the power. 2. While pressing ENTER and BAND together, turn ON the power. � The items in the following table will be checked automatically in order every 2 seconds.
Display Tuned IF Frq Sig Level Stereo RDS Signal Items AST signal =LOW IF COUNT OK SI LEVELh70dB ST signal=LOW RDS DATA OK DISPLAY FM RDS OK or NG OK or NG OK or NG OK or NG OK or NG OK or NG OK or NG AM (MW, LW) NG IC251 NG, RV251 adjustments FE101, IC251 NG, or IF count buffer amp (Q251, Q401) NG IC221 NG, RV221 adjustments IC301 NG, RV301 adjustments IC801 NG
NOTE : The preset data will be erased when this test mode is used. Therefore, take down the data before setting this mode and preset the data again after completing operations in this mode. 2. FLUORESCENT INDICATOR TUBE Check and KEY Check mode 1. Turn OFF the power. 2. While pressing ENTER and RETURN together, turn ON the power. 3. While continuously pressing ENTER and RETURN together, check the following. Microcomputer version indication (1 sec) n All light up �7F� n Dot area only �60� n Dot area only �7E� Dot area only �5F� N Dot area only �3D� Indication test pattern 1 7F ppppp ppppp ppppp ppppp ppppp ppppp ppppp 2 60 �p�p� �p�p� �p�p� �p�p� �p�p� �p�p� �p�p� 3 7E ppppp ����� ����� ����� ����� ����� ����� 4 3D ����� ����� ppppp ����� ppppp ����� ����� 5 5F ����� ����� ����� ����� ����� ����� ppppp N * The indication test patterns from 2 to 5 are indicated on only even grids. The display changes every 1 sec.
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