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Old 14th Feb 2018, 5:13 pm   #6
Markany
Retired Dormant Member
 
Join Date: Jan 2018
Location: Andover, Hampshire, UK.
Posts: 4
Default Racal 9081 display only works on two ranges

Hi All

The repair continues on this 9081, after many faults I finally had the unit working then after a week of on off soak test the display started playing up, what I have found so far is :-

1: the output on all ranges is fine and follows the steps and dial.
2: the counter display is fine on two ranges the 256-520 and 35-64
3: on the other ranges I get random readings

I have traced the issue to the programmable divider area where the 1Mhz clock is divided into required time base, the only reliable selection appears to be the 62Khz one for th 256-520 range.

Before I go getting devices and replacing IC10 and 11 I thought I would ask if anyone has seen anything like this?

Many thanks.

Mark
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