IRT VA-700 User Manual Download Page 23

 

VA-700 

I.R.T. Communications Pty Ltd | www.irtcommunications.com 

 

 

Page 23 of 23

 

Revision 10 

MAINTENANCE & STORAGE

  

 

Maintenance: 

No regular maintenance is required. 
 
Care  however  should  be  taken  to  ensure  that  all  connectors  are  kept  clean  and  free  from  contamination  of  any 
kind.  This  is  especially  important  in  fibre  optic  equipment  where  cleanliness  of  optical  connections  is  critical  to 
performance. 
 

Storage: 

If the equipment is not to be used for an extended period, it is recommended the whole unit be placed in a sealed 
plastic  bag  to  prevent  dust  contamination.  In  areas  of  high  humidity  a  suitably  sized  bag  of  silica  gel  should  be 
included to deter corrosion. 
 
Where  individual  circuit  cards  are  stored,  they  should  be  placed  in  antistatic  bags.  Proper  antistatic  procedures 
should be followed when inserting or removing cards from these bags. 
 

WARRANTY & SERVICE

  

 
Equipment  is  covered  by  a  limited  warranty  period  of  three  years  from  date  of  first  delivery  unless  contrary 
conditions  apply  under  a  particular  contract  of  supply.  For  situations  when  “

No  Fault  Found”

  for  repairs,  a 

minimum  charge  of  1  hour’s  labour,  at  IRT’s  current  labour  charge  rate,  will  apply,  whether  the  equipment  is 
within the warranty period or not. 
 
Equipment  warranty  is  limited  to  faults  attributable  to  defects  in  original  design  or  manufacture.  Warranty  on 
components shall be extended by IRT only to the extent obtainable from the component supplier. 

 

Equipment return:

  

 

Before  arranging  service,  ensure  that  the  fault  is  in  the  unit  to  be  serviced  and  not  in  associated  equipment.  If 
possible, confirm this by substitution. 
 
Before  returning  equipment  contact  should  be  made  with  IRT  or  your  local  agent  to  determine  whether  the 
equipment can be serviced in the field or should be returned for repair. 
 
The equipment should be properly packed for return observing antistatic procedures. 
 
The following information should accompany the unit to be returned: 
 

1.

 

A fault report should be included indicating the nature of the fault 

2.

 

The operating conditions under which the fault initially occurred. 

3.

 

Any additional information, which may be of assistance in fault location and remedy. 

4.

 

A contact name and telephone and fax numbers. 

5.

 

Details of payment method for items not covered by warranty. 

6.

 

Full return address. 

7.

 

For  situations  when  “No

  Fault  Found”

  for  repairs,  a  minimum  charge  of  1  hour’s  labour  will  apply, 

whether the equipment is within the warranty period or not. Contact IRT for current hourly rate. 

 
Please note that all freight charges are the responsibility of the customer. 
 
The  equipment  should  be  returned 

to  the  agent  who  originally  supplied  the  equipment

  or,  where  this  is  not 

possible, to IRT directly. Details of IRT’s direct address can be found at I.R.T. Communications’ website. 
 

Web address: 

www.irtcommunications.com 

 

Email: 

[email protected] 

 
 

Summary of Contents for VA-700

Page 1: ...VA 700 I R T Communications Pty Ltd www irtcommunications com Revision 10 Analogue Video Distribution Amplifier User Manual...

Page 2: ...handle omitted S N 9500000 04 27 11 1996 AJP CVA 3120 sub document included S N 9500000 05 12 01 2001 AL IRT Border page added for PDF format 00COMMON doc file contents added S N 9500000 06 05 07 2002...

Page 3: ...es only 11 DL 700 Delay filter sub module 11 General Description 11 Technical Specifications 12 Configuration 13 Installation 13 AVD 3120 Video sync failure detector 14 General Description 14 Technica...

Page 4: ...onditions dangerous potentials may exist in some circuits when power controls are in the OFF position Maintenance personnel should observe all safety regulations Do not make any adjustments inside equ...

Page 5: ...RGB signal situations The video gain may be varied by 3 dB from the front panel Internal preset controls allow adjustment of the amplifier frequency response optimisation of the longitudinal hum rejec...

Page 6: ...ential gain 0 1 at 4 43 MHz 12 5 87 5 APL Differential phase 0 1 at 4 43 MHz 12 5 87 5 APL Noise 70 dB unweighted Cross talk 75 dB between modules Transit time 22 at 4 43 MHz Cable Equalisation Up to...

Page 7: ...e using the VA 700 to distribute pulses or sub carrier the clamp feature should be disabled LK 1 installed otherwise LK 1 should be removed External clamp reference An external video signal can be use...

Page 8: ...s of the R 70 position the R 71 position and the rear pad of the R 80 position The external clamp reference from the GREEN VDA can be looped through from output connector 10 on the GREEN VDA to output...

Page 9: ...ge specified Earthing The earth path is dependent on the type of frame selected In every case particular care should be taken to ensure that the frame is connected to earth for safety reasons See fram...

Page 10: ...VA 700 I R T Communications Pty Ltd www irtcommunications com Page 10 of 23 Revision 10 Front rear panel connector diagrams O P 1 O P 3 LOOPED I P O P 9 O P 5 O P 7 O P 2 O P 4 I P O P 10 O P 6 O P 8...

Page 11: ...the delay when in operating configuration The DL 700 provides two sockets for fitting DIL delay lines or filters one of up to 40 pins and one of up to 48 pins Pins normally used for grounding connect...

Page 12: ...fier only Input Type DC coupled Impedance 75 Maximum Level 2 V p p 0 dB gain Output Type DC coupled Impedance 75 source terminated Gain 3 dB Adjustable by fitting programming resistor Power requiremen...

Page 13: ...supporting VDA Variable delay To configure the variable delay section use the link pads located near SK 2 Enable Connect LK 1 LK 2 and LK 3 LK 4 Disable Connect LK 2 LK 3 and cut links LK 1 LK 2 and L...

Page 14: ...tribution amplifier for indicating loss of incoming video signals to the VDA An LED is fitted to the sub module which extends through the front panel of the VA 700 and a relay closure alarm output is...

Page 15: ...s after sync loss Alarm reset 800 ms after sync return Indicators alarms Visual indicators VIDEO FAIL ALARM LED Alarm output Relay circuits operated from alarm logic Changeover relay contact set Relay...

Page 16: ...the VDA in order to fit the AVD 3120 and the performance of the VDA will not be affected by the inclusion of the AVD 3120 AVD 3120 If a second equaliser sub module is fitted to the VA 700 as is the c...

Page 17: ...n variations Control may be by either a DC control signal or via a simple potentiometer connected to the VDA This makes the control suitable for both direct manual use or for operation at remote locat...

Page 18: ...emote control connector on rear panel of VA 700 DC 0 12 Vdc connected to pin 3 of 3 pin remote control connector pin 1 Gnd on rear panel of VA 700 Response time constant 0 1 seconds Power Requirements...

Page 19: ...N Where VO is the output voltage and VIN is the video input signal Maximum attenuation If greater attenuation is required the value of R 2 may be adjusted to provide the necessary gain range Please no...

Page 20: ...o remote connection on rear assembly using the three pin IDC socket provided The remote gain control potentiometer should be wired as follows Gain adjustment Under normal circumstances no adjustments...

Page 21: ...provided Standard EQ 1227 equaliser sub module Optional Instruction manual included in VA 700 VA 700T manual TS01ABE tiny slide switch for mounting on VA 700 PCB to switch between EQ 1227 and VA 700 i...

Page 22: ...iser and position 2 to the EQ 1227 equaliser If only EQ 1227 equalisation is to be required the PCB track connecting one side of switch SW 1 should be cut and a link soldered between the centre contac...

Page 23: ...Warranty on components shall be extended by IRT only to the extent obtainable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be serviced...

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