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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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PURITY CONVERGENCE ADJUSTMENT
No. Adjusment point Conditions/Adjusting procedure Waveform or others
PURITY ADJ. GREEN-ONLY Adjust 1 CONVERGENC 1. Receive the "Crosshatch Pattern" signal.
beam current to ~ 500 ÂµA. ADJ. 2. Using the remote controller, call NORMAL mode. BGR
2. Maintain purity magnet at the zero magnetic ( To be done
a b B field and keep static convergence roughly after the purity STATIC CONVERGENCE
ours. through microscope. Adjust landing to the 2. Turn the 6-pole magnet to proper opening anA rank requirements. Fig. a
3. Observe points a, b, as shown Fig. 1-1 gle in order to superpose the blue and red col-
adjusted. adjustment.) 1. Turn the 4-pole magnet to a proper opening anG R
RGB 4. Orient raster rotation 0 eastward. gle in order to superpose the green colour over 5. Tighten up deflection coil screws. the blue and red colours.
6. Make sure CRT corners landing meet the A DYNAMIC CONVERGENCE G
Â» Tightening torque: 108 20 N (11 Â± 2 kgf) R
rank requirements. If not, stick magnet sheet 1. Adjust convergence on fringes of the B to correct it. screen in the following steps. A Note: This adjustment must be done after a) Fig. a: Drive the wedge at point "a" and swing
deflection coil upward. warming up the unit for 30 minutes or and swing the deflection coil downward. G
longer with a beam current over 500 ÂµA. b) Fig. b: Drive the wedge at points "b" and "c" R G B B A = B the deflection coil rightward.
d) Fig. d: Drive the "b" wedge deeper and swing c) Fig. c: Drive the "c" wedge deeper and swing R
Fig. 1-2 the deflection coil leftward. Rank "A"
Fig. c 2. Fix all wedges on the CRT and apply glass tape over them. (On right of the CRT) BGR magnet unit (purity, 4-pole, 6-pole magnets) and B magnet unit lock screw. 3. Apply lacquer to the deflection yoke lock screw, G
A Finally received the Red-only and Blue-only sigB Wedge "a" A = B Fig. 1-3 Lacquer Rank "A" (On left of the CRT)
nals to make sure there is no other colours on the Fig. d screen.
About 100 Deg
Wedge "c" "b"
4-pole magnet 6-pole magnet CRT neck
(21") 20cm Lacquer
Purity magnet 40cm(14")