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Author Topic: HP5335A No input error 7  (Read 1016 times)

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Offline Johnny10Topic starter

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HP5335A No input error 7
« on: April 09, 2018, 11:35:51 am »
Picked up a HP5335A Saturday and after a few quick tests I notice I am not getting a signal through the A or B inputs.

Before opening this unit I wonder if anyone has experience in 5335A not recognizing input to A or B.

Passes start-up self test.
Running Special Diagnostic returns  Error 7.

Unit has Options 010 High Stability and 030 C Channel input.
Channel C works fine.
10Mhz signal on back panel outputs 10Mhz.



Thanks

 
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Online Dr. Frank

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Re: HP5335A No input error 7
« Reply #1 on: April 09, 2018, 12:09:55 pm »
Error 7.0 has something to do with self testing routines, and indicates a missing cable from rear oscillator output to Input.
Please check, whether the rear EXT ARM switches are both set to zero.

The input amplifier and trigger circuit seems to work, as the trigger LED is lit.
What about the Gate LED?

Frank
« Last Edit: April 09, 2018, 12:13:15 pm by Dr. Frank »
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Offline DimitriP

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Re: HP5335A No input error 7
« Reply #2 on: April 09, 2018, 12:47:42 pm »
Quote
Picked up a HP5335A Saturday and after a few quick tests I notice I am not getting a signal through the A or B inputs.

To try measuring using the B input you have to select the B input;   press: Scale, Smooth, 17, ENTER
Feed it the 10Mhz reference from the back and it should display 10.000.000 with the Gate control mostly counter clockwise

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Offline Johnny10Topic starter

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Re: HP5335A No input error 7
« Reply #3 on: April 09, 2018, 12:55:37 pm »
Dimitri
Yes, that got channel B working Reads 10.000.000 +6
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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B
 

Offline Johnny10Topic starter

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Re: HP5335A No input error 7
« Reply #4 on: April 09, 2018, 02:49:00 pm »
OK,
So I take off case top, remove cables going from input board to mainboard, check for signal.
A and B have signal to mainboard, Good.

Put connector back on and tighten, now I have both channels working.
Loose connector!

Yes...

« Last Edit: April 09, 2018, 02:50:44 pm by Johnny10 »
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Tektronix TDS7104, DMM4050, HP 3561A, HP 35665, Tek 2465A, HP8903B, DSA602A, Tek 7854, 7834, HP3457A, Tek 575, 576, 577 Curve Tracers, Datron 4000, Datron 4000A, DOS4EVER uTracer, HP5335A, EIP534B 20GHz Frequency Counter, TrueTime Rubidium, Sencore LC102, Tek TG506, TG501, SG503, HP 8568B
 
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