Fluke/Wavetek 910R GPS Frequency Std - schematics wanted (5/10MHz output fails)

[carl_lab]

Can somebody help me to find schematics for a Fluke 910/910R GPS-Controlled Frequency Standard, please?



The 5 and 10MHz outputs are stone-dead (no signal). 1 PPS output is OK.
+5V test pins at J910 (connector unpopulated/free) is dead (0.9V).
+5V, -5.2V, 12V  named test pins beside the GPS sub board are OK.
TTL supply voltage is measured about 4.9V (OK).

[carl_lab]

OK, rubidium module does not deliver 10MHz output signal.
Supply voltages seem to be OK.

[NRP_SANTOS]

Hi Carl,
I have the same problem on my equipment. Do you have a diagnosis?
nrp_santos

[NRP_SANTOS]

22v is missing to power the oscillator. U901 breakdown.

Change U901  UC3842AD (Controlador de comutação Current-Mode PWM Controller) and capacitor 100uf 50v.

best Regards