Hi,
I have an HP8566B (yeah, pretty old). Two questions:
1) Everyday, when I turn it on in the morning, it takes it about 15minutes to start up. Is that normal?
2) Recently, I have noticed that at the back of the instrument, sometimes, the top fan does not turn on when I power on my instrument. And when this happens, the instrument does not start up at all. I am wondering if the fan is almost at its end of life? I usually end up waiting for a day to try again, with the hope that the fan and the instrument will start up normally.
I am assuming a dying fan is causing the problem. How can I replace the fan? (or fix this problem in general?)
ANY help/troubleshooting tips would be greatly appreciated!!
Umar
PhD Candidate,
CREOL - The College of Optics
University of Central Florida
I have an HP8566B (yeah, pretty old). Two questions:
1) Everyday, when I turn it on in the morning, it takes it about 15minutes to start up. Is that normal?
2) Recently, I have noticed that at the back of the instrument, sometimes, the top fan does not turn on when I power on my instrument. And when this happens, the instrument does not start up at all. I am wondering if the fan is almost at its end of life? I usually end up waiting for a day to try again, with the hope that the fan and the instrument will start up normally.
I am assuming a dying fan is causing the problem. How can I replace the fan? (or fix this problem in general?)
ANY help/troubleshooting tips would be greatly appreciated!!
Umar
PhD Candidate,
CREOL - The College of Optics
University of Central Florida
1. The 8566B should not take 15 minutes to start up. As I recall the instrument takes about 15 seconds from power switch ON to when you see a display.
Now, as the instrument ages, the CRT sometimes takes a bit longer to light up, but this should only account for another 5 seconds maybe.
Another thing is the internal oven controlled frequency reference takes time to warm up, and you usually see an “oven cold” message on screen, but the instrument should still sweep even with a cold oven. I suppose if the internal oscillator is having difficulty even starting up, this could lead to a longer than normal “start up”
You could try using an external reference (maybe you have a signal source that has a 10 MHz Ref Output).
2. Fan replacement.
The 8566B (85660B plus 8562A) has been out of production for 14 years, and out of support life for 9 years. I checked to see if the fan retro fit kit or stand alone fan is still orderable from Agilent, and it is not.
The complication with the 85662A IF Section fan replacement is that earlier instruments (serial numbers <3001A18430) had the early fan, and newer instruments had a different fan. Many ‘early” instruments were upgraded using a fan replacement kit. However, bottom line is the replacement kit and the fan is not available to order, and I have not been able to determine the fan manufacture’s part number.
When the instrument was being supported, the following information was true:
The first 85662A with the new fan / fan housing was serial 3001A18430
85662-60243 50- to 60-Hz fan kit (fan with wires and connectors, housing, etc..) used
in the following
instrument:
HP 85662A S/N <3001A18430
85662-60219 50- to 60-Hz fan assembly
Replaces fans in HP 85662As
that already have new fans. This is the “wired” fan motor
For your situation, I am afraid you will need to locate another 85662A that has at least a good fan, and perform the fan swap.
Regards -