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Author Topic: Hewlett Packard 400FL decibel and volt meter  (Read 1147 times)
RADIOFREEISRAEL
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Posts: 57




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« on: August 22, 2008, 05:02:40 AM »

Greetings,
I urgently need an updated technical manual circuit for the A2 PWB assembly marked 00400.66514 Rev A.
After some years of use the unit developped a problem.
Since I have the original service Manual looked into the circuit diagram of the pre amp and run into major differences between the Manual and the physical assembly.
Contacted HP/Agilent but no answer yet.
I cannot set the critical BIAS voltage and that prompted me to look into the voltages at the FET and the other transistors in the amplifier section.
From that the meter bridge voltages are also off.

Any help will be welcome,

Cordially

Sam
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