[time-nuts] Wavecrest DTS 2077 Service Manual?

[Adrian]

Hi Henk,

as by the component date codes, my unit is probably from 1998. Some - 
possibly replacement - boards have date codes up to late 2000.

Upon power up this error message is displayed:
'Path Checksum Error - Perform External Calibration'

DC Cal. finishes, but the next step with cal outputs connected to inputs 
fails immediately.
The measurement display says: MEAS: no pulses found

When I try internal cal., I'm getting 'Cal init failed - No IQM Intr' 
displayed.

Apparently the DC calibration happens on the large input board, while 
the other cal steps are addressing the IQM ('Test Interval Quantizer 
Board').
It seems like the failure is IQM board related. When I run calibration 
with the IQM board pulled, my unit still behaves the same way.

Adrian


Henk schrieb:
> Hi,
>
> The Wavecrest DTS 207X has a number of proms and also battery back-up
> devices. I think it will be wise to check these first.
> Or are you sure that it is hardware? How old is your DTS?
>
> Henk
>
>
>
>> In the meantime I heard that Wavecrest is not distributing service
>> manuals. All repair is depot.repair.
>>
>> This makes me considering if I should take the chance on a second unit,
>> hoping to get one working out of two, or simply to give up and accept
>> that these boxes are only intended to be used as door stops of land fill
>> once defective... I've never been confronted with such a poor customer
>> sevice attitude before.
>>
>> Nevertheless... is there anyone who has acquired some experience with
>> the DTS-series innards who would be willing to share his knowledge?
>>
>> Adrian
>>
>>
>> Adrian schrieb:
>>> Anyone have a Wavecrest DTS 2075/77/79 service manual?
>>>
>>> I've recently got a DTS 2077 that however turned out to be defective.
>>> There was a power supply failure that I could fix, but there is still
>>> a power-up selftest error message and calibratin fails.
>>>
>>> Adrian
>>>
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>>
>>
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>
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