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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+++++++++++++++++++++++++
PURITY CONVERGENCE ADJUSTMENT
a b
B (2) Degauss CRT. Maintain magnet after the purity mode. G
NO POINT ADJUSTMENT CONDITION / PROCEDURE WAVEFORM OR OTHERS PURITY ADJ. GREEN ONLY Adjust 1 CONVERGENCE (1) Receive the "Crosshatch Pattern" signal. B G R
beam current to over 700µA ADJ (To be done (2) Using the remote controller, call NORMAL
at zero magnetic field and keep the static adjustment.) (Static convergence) R convergence roughly adjusted. (1) Turn the 4 pole magnet to a proper opening Fig. 1-1 through microscope. Adjust the landings to colours.
R G B
(3) Observe points a,b, as shown Fig.1 1 angle in order to superpose the blue and red Fig. a
A rank requirement. (2) Turn the 6 pole magnet to a proper opening
A Tightening torque : 108N 20N ( 11Kgf ± 2Kgf (Dynamic convergence ) A=B (6) Make sure CRT corners landing meet A (1) Adjust convergence on fringes of the
B sheet to correct it. a) Fig. a : G
(4) Orient raster rotation 0 eastward. angle in order to superpose the green colour R
G (5) Tighten up deflection coil screws. over the blue and red colours. B
Fig. b
rank requirements. If not, stick magnet screen in the following steps. R G B
B
Note : This adjustment must be done after Drive the wedge at point a " and swing Fig. 1-2 Rank A (On the right of CRT) R
warming up unit for 30 minutes or longer the deflection coil upward. with a beam current over 700µA. b) Fig. b :
Drive the wedge at point b " and Fig. c
G R change. c) Fig. c :
* For following colours press R/C RGB key to swing the deflection coil downward. A B G R
B Drive the c " wedge deeper and B
A=B
swing the deflection coil rightward. d) Fig. d :
1-3 Rank A (On the left of CRT) Drive b " wedge deeper and swing the Fig. d ONLY
RED GREEN BLUE
deflection coil leftward.
Wedge "a" (2) Fix all wedges on the CRT and apply glass
9
tape over them.
(3) Apply lacquer to the deflection yoke lock screw, magnet unit (purity, 4 pole, 6 pole
* Press R/C RGB key for 1 second in NORMAL MODE, Signal-colour the colour will change to RGB screen cleared mono colour mode. About About
100 Deg
magnets) and magnet unit lock screw.
Lacquer
Finally received the Red and Blue only signals to make sure there is no other colours on the screen. 6-Pole Magnet. CRT NECK
100 Deg
"b" Wedge "c"
(21") 20cm Purity Magnet Lacquer 4-Pole Magnet
20GT-30 21GT-30
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