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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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Locking the controls
To protect adjustment data by locking the controls, first move the control button m/M to select (CONTROL LOCK). Then move the control button ,, to select ON. Only the 1 (power) switch, EXIT, and (CONTROL LOCK) of the OPTION menu will operate. If any other items are selected, the mark appears on the screen.
To cancel the control lock Repeat the procedure above and set
Helpful hints and information (HELP)
The HELP menu contains helpful hints and information about this monitor. If your monitor is displaying symptoms that match those listed in the HELP menu, follow the on-screen instructions to resolve the problem. If the symptoms do not match those listed in the HELP menu or if the problem persists, see âTrouble symptoms and remediesâ on page 17.
THIN HORIZONTAL LINE
The lines that appear on your screen are damper wires. See page 16 for more information about the damper wires.
Resetting the adjustments
This monitor has the following three reset methods. Use the RESET button to reset the adjustments.
If the shape of the picture on the screen seems distorted, try adjusting the pictureâs geometry. Move the control button , to jump directly to the GEOMETRY menu.
(CONTROL LOCK) to OFF.
OUT OF FOCUS
The picture may seem to be out of focus when the red and blue color signals are not aligned properly, causing red or blue shadows to appear around letters and lines. Try adjusting the pictureâs convergence to make the shadows disappear. Move the control button , to jump directly to the CONVERGENCE menu. When the CONVERGNECE menu is displayed, the contrast, brightness and moire adjustment settings are automatically reset for all input signals.
Restoring the color
The colors of most display monitors tend to gradually lose brilliance over several years of service. The IMAGE RESTORATION feature allows you to restore the color to the original factory quality levels. The explanation below explains how to restore the monitorâs color. To restore the color, first move the control button m/M to select (IMAGE RESTORATION). Then move the control button ,. The picture disappears while the color is being restored (about 2 seconds). After the color is restored, the picture reappears on the screen again.
Notes â¢ Before using this feature, the monitor must be in normal operation mode (green power indicator on) for at least 30 minutes. If the monitor goes into power saving mode, you must return the monitor to normal operation mode and wait for 30 minutes for the monitor to be ready. You may need to adjust your computerâs power saving settings to keep the monitor in normal operation mode for the full 30 minutes. If the monitor is not ready, the following message will appear.
OPT I ON
AVA I L AB L E A F T ER WARMâ UP
1 Press the center of the control button.
The main MENU appears on the screen.
Resetting a single adjustment item
Use the control button to select the adjustment item you want to reset, and press the RESET button.
2 Move the control button to highlight
HELP and press the center of the control button again. The following HELP menu appears on the screen.
HE L P RE TURN TO MA I N MENU RECOMMENDED RESOL UT I ON F L I CKER TH I N HOR I ZONT A L L I NE D I S TORT ED SHAPE OUT OF FOCUS D I SCOLORA T I ON
Resetting all of the adjustment data for the current input signal
Press the RESET button when no menu is displayed on the screen. Note that the following items are not reset by this method: â¢ on-screen menu language (page 8) â¢ on-screen menu position (page 13) â¢ control lock (page 14)
If the pictureâs color appears abnormal in certain areas of the screen, first check for any loose signal cables. After you have checked the cables, try degaussing (demagnetizing) the screen manually. Move the control button , to jump directly to the OPTION menu, then select (DEGAUSS).
3 Move the control button m/M to select a HELP menu
item and press the center of the control button again. Instructions or information to resolve the problem appears on the screen. An explanation of each menu item is given below.
Resetting all of the adjustment data for all input signals
Press and hold the RESET button for more than two seconds.
Note The RESET button does not function when set to ON. (CONTROL LOCK) is
If the picture does not fill the screen to the edges or if the picture appears too large for the screen, adjust the resolution to the figures shown in the menu using your computer. If the input signal matches one of this monitorâs factory preset modes, the resolution and refresh rate of the current input signal are displayed.
RECOMMENDED RESOL UT I ON SE T RESOL UT I ON TO 1 2 8 0 X 1 0 2 4 A T 8 5 H z US I NG PC . CURRENT SE T T I NG I S 1 2 8 0X1 0 2 4 AT 7 5Hz .
I MAGE RES TORA T I ON
â¢ The monitor may gradually lose its ability to perform this function due to the natural aging of the picture tube.
If the picture is flickering, adjust the refresh rate to figures shown in the menu. If the input signal matches one of this monitorâs factory preset modes, the refresh rate of the current input signal is displayed.
F L I CKER SE T RE FRESH RA T E TO 7 5 H z OR 8 5 H z US I NG PC . CURRENT SE T T I NG I S 6 0 H z .