[Racal] R1792 Display lighting tip required

[Peter Worrall, G4GJL]

Dan, thanks for your help. Your words about the acrylic panel behind are 
re-assuring! I did not want to run any risk of damaging the displays.

I will raid my son's junk box for a pair of slot covers at the weekend!

Once again many thanks

Pete
G4GJL
----- Original Message ----- 
From: "Dan Rae" <danrae at verizon.net>
To: "Peter Worrall, G4GJL" <g4gjl at btopenworld.com>
Cc: <racal at mailman.qth.net>
Sent: Tuesday, November 01, 2005 3:11 PM
Subject: Re: [Racal] R1792 Display lighting tip required


>
>
> Peter Worrall, G4GJL wrote:
>
>> I just recently became the owner of a backlit RA1792.
>>
>> Some of the bulbs have blown, and the previous owner let me have a pack 
>> of replacement bulbs.
>>
>> Problem is how to get the display modules out in order to access the 
>> bulbs....
>>
>> I realise I have to remove the front panel first, as the maintenance 
>> manual says this. It is rather scanty on how to proceed beyond that!
>
> You will have to remove the LCD displays to get at the bulbs, after 
> removing the panel.  I have made tools to pull them from the blanking 
> strips that go over unused computer slots, with the short part of the L 
> shape cut down a bit and padded with a thin bit of rubber.  Gentle pulling 
> at both ends should free the displays.  Make a note of which way round 
> they are, although you can usually see the patterns by angling them right. 
> Actually the back lit ones are much easier to remove safely than the 
> others due to the perspex (acrylic) diffuser on the back.
>
> The bulbs ( 5 Volt, 60 mA) are wired in series pairs across the 9 Volt AC 
> supply.   To get an evenly lit display you may need to replace both in a 
> pair, even if one is good.
>
> 73
> Dan
> ac6ao / g3ncr
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