HP OVEN repair method No2
TCXO Frequency is over 10MHz .
Stability is bad. Drift to down with slow.
OVEN Heater Protection fuse blow out. 105degC.
But Frequency is can not set adjustable range .
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Adjust is made by two Variable Resistor. Cource and Fine
It change to DC voltage for Variable Capacitor Diode(Varicap) at Xtal.
Some types have Variable Capacitor in OSC unit .
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This type has no Adjustable point or parts.
OSC circuit is in Oven case.
C(20pF) is connected one of Xtal leg.
I cut and try change 15pF .
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Take care set same position.
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Check Frequency and stability .
It can within 10E-8 .
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