HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
Checked the PSU voltages on the PSU card next to the 10811.
The -5.2 is reading -4.2.
Took a look with the scope and instead of a nice flat DC I see a 4V Peak to Peak spike @ 100Hz.
Trying to track down a service manual.
Any ideas on this one guys, if the Pass tranny was shorted, it would be a lot more than 4.2V unless the overvoltage Zener is able to sink all that current...
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Electrolytic capacitors: check them on the PSU, usually they are the
first to look for.
On Sat, Jul 6, 2013 at 12:46 PM, Mark C. Stephens marks@non-stop.com.au wrote:
Checked the PSU voltages on the PSU card next to the 10811.
The -5.2 is reading -4.2.
Took a look with the scope and instead of a nice flat DC I see a 4V Peak to Peak spike @ 100Hz.
Trying to track down a service manual.
Any ideas on this one guys, if the Pass tranny was shorted, it would be a lot more than 4.2V unless the overvoltage Zener is able to sink all that current...
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
C3 (17000uf @ 10v) is open circuit.
Where am I going to get one of those from.
I need some advice here, Should I just use modern low ESR solder lug type soldered directly onto the board?
Or Should I try and locate a screw terminal type Capacitor?
Obviously, I want to do the best for this timer as I rely on it tremendously.
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:47 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
Checked the PSU voltages on the PSU card next to the 10811.
The -5.2 is reading -4.2.
Took a look with the scope and instead of a nice flat DC I see a 4V Peak to Peak spike @ 100Hz.
Trying to track down a service manual.
Any ideas on this one guys, if the Pass tranny was shorted, it would be a lot more than 4.2V unless the overvoltage Zener is able to sink all that current...
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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and follow the instructions there.
sounds quite typical for a dried out electrolytic cap.
Look for the unregulated -10V that goes into the regulator circuit.
Most likely C3 on the power supply motherboard is dead.
Adrian
Mark C. Stephens schrieb:
Checked the PSU voltages on the PSU card next to the 10811.
The -5.2 is reading -4.2.
Took a look with the scope and instead of a nice flat DC I see a 4V Peak to Peak spike @ 100Hz.
Trying to track down a service manual.
Any ideas on this one guys, if the Pass tranny was shorted, it would be a lot more than 4.2V unless the overvoltage Zener is able to sink all that current...
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Correct, C3 (17000uf @ 10v) is measuring 39uf :)
I have a 29000@10V, same dimensions, do you think the rectifiers can hack that big fella?
10000uf is quite a bit more.
Out of interest, this cap was replaced before, it is not a blue Sprague or Mallory but a grey Phillips Cap.
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Adrian
Sent: Saturday, 6 July 2013 9:19 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
sounds quite typical for a dried out electrolytic cap.
Look for the unregulated -10V that goes into the regulator circuit.
Most likely C3 on the power supply motherboard is dead.
Adrian
Mark C. Stephens schrieb:
Checked the PSU voltages on the PSU card next to the 10811.
The -5.2 is reading -4.2.
Took a look with the scope and instead of a nice flat DC I see a 4V Peak to Peak spike @ 100Hz.
Trying to track down a service manual.
Any ideas on this one guys, if the Pass tranny was shorted, it would be a lot more than 4.2V unless the overvoltage Zener is able to sink all that current...
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]
On Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting
normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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Mark C. Stephens wrote:
Correct, C3 (17000uf @ 10v) is measuring 39uf :)
I have a 29000@10V, same dimensions, do you think the rectifiers can hack that big fella?
Without a blush!
-Chuck Harris
10000uf is quite a bit more.
Mark C. Stephens wrote:
Correct, C3 (17000uf @ 10v) is measuring 39uf :)
I have a 29000@10V, same dimensions, do you think the rectifiers can hack that big fella?
Without a blush!
Except for the 10V part. (Which I missed on the first post)
You have to use a capacitor that is at least 2x the operating voltage,
and is also greater than any peak voltages that could occur in the
boundary cases, such as the power line being at the scope's rated
maximum power line voltage.
-Chuck Harris
10000uf is quite a bit more.
Most of the Caps I have of that size are around ~1/2 the capacitance but twice the voltage.
I'll go check the dumpster (...err garage) for some old gear that's due to be scrapped.
I am going hate myself if I have to part mule a probably working 8568A/B for a some sort of PSU cap.
Yeah, I see your point about the cap voltage, that hadn't occurred in my electrolytic candidates to me for some reason!
I'll take that one on-board definitely :)
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On Behalf Of Chuck Harris
Sent: Saturday, 6 July 2013 11:05 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting normally, PB LEDS scannning and appears to be reading o/k
Mark C. Stephens wrote:
Correct, C3 (17000uf @ 10v) is measuring 39uf :) I have a 29000@10V,
same dimensions, do you think the rectifiers can hack that big fella?
Without a blush!
Except for the 10V part. (Which I missed on the first post)
You have to use a capacitor that is at least 2x the operating voltage, and is also greater than any peak voltages that could occur in the boundary cases, such as the power line being at the scope's rated maximum power line voltage.
-Chuck Harris
10000uf is quite a bit more.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
What's the specified tolerance on the 17,000 uF? You probably have quite a
range to work within. If you are lucky, they specified something like
+80/-20% and the 29,000 uF might be OK (measure it).
On Sat, Jul 6, 2013 at 4:18 AM, Mark C. Stephens marks@non-stop.com.auwrote:
C3 (17000uf @ 10v) is open circuit.
Where am I going to get one of those from.
I need some advice here, Should I just use modern low ESR solder lug type
soldered directly onto the board?
Or Should I try and locate a screw terminal type Capacitor?
Obviously, I want to do the best for this timer as I rely on it
tremendously.
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:47 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting
normally, PB LEDS scannning and appears to be reading o/k
Checked the PSU voltages on the PSU card next to the 10811.
The -5.2 is reading -4.2.
Took a look with the scope and instead of a nice flat DC I see a 4V Peak
to Peak spike @ 100Hz.
Trying to track down a service manual.
Any ideas on this one guys, if the Pass tranny was shorted, it would be a
lot more than 4.2V unless the overvoltage Zener is able to sink all that
current...
-marki
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com] On
Behalf Of Mark C. Stephens
Sent: Saturday, 6 July 2013 8:18 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5370B Leds pulsing slowly, buttons selecting
normally, PB LEDS scannning and appears to be reading o/k
I went to use my 5370B todayt and noticed the LEDS on the display are
slowly sort of pulsing bright one after another.
Also all the push button LEDS are going on and off one by one.
The strangest thing is that it appears to be working o/k via HPIB.
I don't have extender boards but I do have a signature analyser.
Could it be something silly like one of the PSU regulator has gone kaput?
Has anyone seen this issue before?
-marki
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
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and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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and follow the instructions there.