Jumpers And User Adjustments; Selecting Whether Local Faults Will Be Monitored By The Global Frame Status; Setting The Video Amplifier Gain; Setting The Character White Level - evertz 7700 Series Manual

7700 Series DTV Frame Manual
7700SID-CM Analog Source ID Decoder
6.

JUMPERS AND USER ADJUSTMENTS

EVERTZ (A) 7700TM
MODULE STATUS
SIG
- 5 VDC
ON
OFF
FRAME
STATUS
6.1. SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS
FRAME STATUS The FRAME STATUS jumper located at the front of the module determines whether
local faults (as shown by the Local Fault indicator) will be connected to the 7700FR
frame's global status bus.
To monitor faults on this module with the frame status indicators (on the PS FRAME
STATUS LED's and on the Frame's Fault Tally output) install this jumper in the On
position. (Default) When this jumper is installed in the Off position, local faults on
this module will not be monitored.
6.2.

SETTING THE VIDEO AMPLIFIER GAIN

The VGAIN 1 trimpot R120 and VGAIN 2 trimpot R173 located near the output BNC connectors are used
to set the gain of the video amplifiers. To calibrate the video keyer gain, connect colour bars from your
sync generator to the Video input BNC and to channel A of your oscilloscope. Connect one of the video
outputs of the model 7700SID-CM to channel B of your scope and terminate it. Adjust the appropriate
trimpot so that the output amplitude matches the input.
6.3.

SETTING THE CHARACTER WHITE LEVEL

The CHR LV trimpot R211 located near the Metral Power connector is used to set the white level of the
characters. The character level is factory adjusted to peak white level.
6.4.

SETTING THE LEFT MARGIN OF THE CHARACTER RASTER

The RASTER trimpot R104 located near U24 is used to set the position of the left side of the character
scanning raster. The left side is factory adjusted to start approximately 12 µsec after the leading edge of
horizontal sync.
7700SID-CM-12
SFF POWER GND +12V

Figure 6: Location of Jumpers

Revision 1.0
RASTER
VGAIN1
VGAIN2
CHR LV