EFJohnson VR-CM50 User Manual
EQUIPMENT CHECK-OUT AND ADJUSTMENTS
6-3
February 1996
Part No. 004-3039-274
Headset Receive Limit
The receive audio sensitivity and the method of
handling audio overload varies widely among headset
manufacturers. To avoid dispatcher complaints about
excessive receive background noise, use the follow-
ing procedure to set the headset receive limit:
manufacturers. To avoid dispatcher complaints about
excessive receive background noise, use the follow-
ing procedure to set the headset receive limit:
Inject a tone into the Rx port of an available LIC card
and Select the channel.
and Select the channel.
Turn the radio headset jack volume control to its max-
imum (loudest) setting.
imum (loudest) setting.
If the headset amplifier has a volume control and/or
volume switch, set them to maximum.
volume switch, set them to maximum.
Locate the Headset Limit control (HS LIM) on
the Selected Audio speaker amplifier board. Turn
this control to its maximum setting. While listening to
the tone, slowly turn this control down until you hear
the output from the headset earpiece just begin to
decrease. Set the control slightly above this point
such that the headset is just into compression with its
volume controls at maximum. The headset jack radio
volume control and any controls on the headset itself
can be used to adjust the volume to each operator’s
preference.
this control to its maximum setting. While listening to
the tone, slowly turn this control down until you hear
the output from the headset earpiece just begin to
decrease. Set the control slightly above this point
such that the headset is just into compression with its
volume controls at maximum. The headset jack radio
volume control and any controls on the headset itself
can be used to adjust the volume to each operator’s
preference.
TELCO Level Adjustments
TDV-OP409 is an electronic interface which pro-
vides amplification and adjustments for the receive
level. Refer to the VR-CM50 Console Service Man-
ual, Volume 1, CRT- Technical Manual Section , for
jumper configuration settings.
level. Refer to the VR-CM50 Console Service Man-
ual, Volume 1, CRT- Technical Manual Section , for
jumper configuration settings.
External Encoder
If the console is equipped with an external paging
encoder (such as ZETRON), the input sensitivity is
adjusted by the ENCDR control, R33. There is no sig-
nal compression in the external encoder audio path.
If the data furnished to E.F. JOHNSON at the time of
order did not specify the use of an external encoder,
the port on the tray will not be programmed to be
active.
adjusted by the ENCDR control, R33. There is no sig-
nal compression in the external encoder audio path.
If the data furnished to E.F. JOHNSON at the time of
order did not specify the use of an external encoder,
the port on the tray will not be programmed to be
active.
NOTE: The ENCDR control does not affect the output
of the internal keypad encoder on the control tray.
Paging tones are actually generated on the LIC card,
not in the control tray.
of the internal keypad encoder on the control tray.
Paging tones are actually generated on the LIC card,
not in the control tray.
Telephone Ringer
If the console is equipped with the Integrated
Telephone Screen option, the internal telephone
ringer volume can be set by the S MIX control, R86.
ringer volume can be set by the S MIX control, R86.
6.4 ALIGN THE CRT TOUCHSCREEN WITH
THE PC COMPUTER
If your system is equipped with a touchscreen
option (TDV-OP492/xx), the touchscreen must be cal-
ibrated for the specific monitor on which it is
installed. Before calibrating the touchscreen, adjust
the height, width and position of the CRT image.
ibrated for the specific monitor on which it is
installed. Before calibrating the touchscreen, adjust
the height, width and position of the CRT image.
1. Return to the Main Screen:
If you are at any other screen but the Main Screen,
Press "MAIN" to return to the Main Screen.
Press "MAIN" to return to the Main Screen.
2. Access the c:\> prompt:
Press CTRL + 5 using the "5" from the NUMERIC
KEYPAD.
c:\orba> will display.
KEYPAD.
c:\orba> will display.
Type cd\ (Enter)
c:\> will display.
c:\> will display.
3. Begin the Calibration Program:
At the c:\> prompt:
Type "sfcal" (Enter)
Follow the instructions on the screen:
Type "sfcal" (Enter)
Follow the instructions on the screen: