FAULT FINDING

INTRAC-305

Install new lamp and wire assembly. Wrap reflector sheet around lamp. Replace securing tapes to secure reflector.

Turn unit face up and ensure that backlight is free from contamination - dust may be blown free.

Slide backlight into display unit. Replace metal cover over backlight. Replace retainers, press centre to secure.

Locate display unit over the four studs and fit the nuts.

Re-fit INTRAC front panel to side panels, reconnect flex cable and lamp wires.

Replace INTRAC top cover, reconnect power, switch on and verify that the lamp illuminates.

Some, or all, front panel

The six menu keys, the numerical keypad and the manual

keys do not function

control keys are all connected in a matrix. There are three

 

supply lines to the matrix and eight return lines. If any one of

 

these lines fails at least three keys will cease to function. The

 

fault may be the ribbon cable to J27 (Interface PCB), the

 

connectors or the Interface PCB itself.

 

If only one key does not function the fault will be with that key

 

and the front panel PCB will have to be replaced. This board

 

is held on the front panel by six threaded studs. Disconnect

 

the ribbon cable and the emergency stop switch (note which

 

wire goes to which terminal). Remove the six nuts and lift the

 

PCB off the studs.

Emergency Stop Switch Fails

Pressing the front panel emergency stop switch should cause

 

the System Alarm indicator to illuminate and the INTRAC to

 

enter Standby Mode.

 

The switch consists of two normally closed (N.C.) contacts

 

pressing the switch opens both sets of contacts. The switch

 

connects to the Interface PCB through the front panel PCB

 

and the ribbon cable. If the switches are OK and there is

 

continuity to connector J27 on the Interface board the fault is

 

on that board.

Pointing Angles Incorrect

The resolvers consist of three coils two of which move with

 

respect to the third. A continuous signal is sent from the

 

INTRAC to the fixed coil and is induced into the other two

 

coils. The amount of induction in each coil is dependant on

 

the respective position of the coils.

 

The signal sent from the INTRAC is the same for all

 

resolvers.

angles constantly varying

Constantly changing angles is caused by noise on the two

 

return signal lines. This implies that the source signal is not

 

present in the resolver. For one angle (i.e. Az, El or Pol) to

 

be changing either the circuit to the resolver is broken or the

 

resolver itself is faulty.

Page 80

INTRAC-305 MANUAL - Issue 3.2

© 2011 Advantech Wireless

Page 92
Image 92
Advantech INTRAC-305 user manual System Alarm indicator to illuminate and the Intrac to, Enter Standby Mode, On that board