Knox Video Media Flex Series - Manual (Page 7)

Input Impedance: 15Kohm
Output Impedance: 100 ohm
Crosstalk:
less than -85dB@1KHz
VGA Channels:
Signal, RGB: 1v analog
Input Impedance: 75 ohms
Output Impedance: 75 ohms
Signal, H&V:
0-5 vdc, TTL compatible
Input Impedance: 510 ohms
Output Impedance: 75 ohms
Connectors:
Video: 32 BNC per video channel
Audio: 64 RCA
VGA (optional): 16 DB15HD female
RS232: 1 DB9 female
Contact closures: 1 DB25 male
Power Consumption: nominal 12v, 1.5 A from internal switching power
supply
Input Voltage: 100-240VAC, 50/60 Hz, .5A, 40 watts maximum
Internal Fuse: 5x20mm slo-blo, 250v, 1 A
Dimensions: 17” wide by 7” high by 10” deep
Shipping Weight: 12 pounds
Page 2
KNOX VIDEO
MediaFlex Series Audio/Video Distribution System
Page 23
KNOX VIDEO
MediaFlex Series Audio/Video Distribution System
SECTION 4. MAINTENANCE
CAUTION! Disconnect from power before removing top cover. Do not operate
unit with top cover removed.
4.1 INTRODUCTION
The MediaFlex Series uses passive air flow (convection) to keep its chassis-
mounted power supply within a comfortable operating temperature range. No
maintenance of the cooling system is required.
The power supply is protected by a 5x20mm slo-blo fuse rated at 1 amp.
The CPU on the front panel controller board has a battery backed-up memory
for the crosspoint pattern storage and other non-volatile functions. It is important
to check the battery annually and replace it when necessary. The battery is a
DL1220 type (one-half inch in diameter, 1/10 inch thick) with a 3.2 volt rating. To
avoid memory loss, replace the battery when the measured voltage falls below 2.8
volts. Be sure the replacement battery is installed with the + side visible.
No other routine maintenance is required in the MediaFlex.
4.2 SWITCH/JUMPER OPTIONS
There are no switch/jumper options in the MediaFlex.
4.3 CLEARING THE MEMORY
Under certain circumstances, such as upon failure of the memory back-up
battery, the MediaFlex memory may become corrupted.
To clear the main memory, send the RS232 letter command c followed by Enter.
To clear the pattern memory, send cm followed by Enter. To clear the contact
closure memory send kc followed by Enter. To clear source and destination names,
send ,(comma) followed by Enter.
To clear all volume, tone, and balance adjust-
ments and set them to their default values, send $c followed by Enter. To clear all
input trim values and set them to zero, send $ci followed by Enter. After replacing
the memory back-up battery, you must send the command L01 to set up the default
front panel configuration.