Recent posts

#41
Out of Production Hardware / Re: Protrack fails volt check
Last post by admin - November 29, 2023, 06:19:33 AM
Those voltages are reading just a bit high. You could try running through the ProTrack setup procedure:
ProTrack final test procedure
You would be looking at section 2.0.
#42
Out of Production Hardware / Protrack fails volt check
Last post by Al1234 - November 27, 2023, 11:44:17 PM
Could anyone shed some light on this please.
Protrack keep failing on the same voltage and some times on the 2nd voltage after its been on for longer.
And if it's been on for longer tge voltage it fails at is a bit higher.

Please see picture of failed voltages.

#43
Out of Production Hardware / Re: Broken ProTrack leg, then ...
Last post by Al1234 - November 25, 2023, 09:16:25 AM
Yes I am sure you are correct.
#44
Out of Production Hardware / Re: Broken ProTrack leg, then ...
Last post by jvthorsley - November 25, 2023, 08:54:19 AM
That amount of dust could give confusing results on high resistance ranges especially in a humid atmosphere!
#45
Out of Production Hardware / Broken ProTrack leg, then foun...
Last post by Al1234 - November 24, 2023, 04:27:26 PM
I broke the front leg with 1 finger, not On purpose
Due to loose scrws under the main board I had to get them out before turning it back on.
Removed almost everything. Then found something very interesting in the back side of the main board. A bridge of dirt from channel A to common. See picture.
I do have intermittent overvoltage massages on this unit. After a good cleanup, we will see if it happens again.
#46
Out of Production Hardware / Re: Huntron Protrack KJ2
Last post by fetron - November 23, 2023, 02:19:49 AM
Hello dogansabanoglu!

Please check power supply points:

The reference point for all voltage measurements is the Protrack front banana socket common. Multimeter common to Protrack common.

LOCATION               VOLTAGE                             NAME / FUNCTION
L5 (J22 side)           +4.75 to +5.25 VDC             +5V, +5 volt DC supply for mostly digital circuits

U37 pin 2 (center)  +11.4 to +12.6 VDC             +12V supply

+5A (near C176)     +4.75 to +5.25 VDC             +5A, +5 VDC analog supply

-5A (near C176)      -4.75 to -5.25 VDC               -5A, -5 VDC analog supply

C58 (- lead)             -22.8 to -25.2 VDC              -24V, -24 VDC analog supply

C64 (+ lead)           +22.8 to +25.2 VDC             +24V, +24VDC analog supply

U80 (pin 3)             -11.4 to -12.6 VDC               -12V, -12V LCD supply

These points must also be checked during range changes.
How much do the voltage values jump during the range change?
#47
Out of Production Hardware / Re: Huntron Protrack KJ2
Last post by dogansabanoglu - November 23, 2023, 01:11:42 AM
Yes, there is the same problem on channel B.  I checked the relays you mentioned.  All working.
https://drive.google.com/file/d/1XbjqN-xBZBvM5t4fsVdNop_v_jaO_OQ7/view?usp=drivesdk
#48
Out of Production Hardware / Re: Huntron Protrack KJ2
Last post by admin - November 22, 2023, 10:27:56 AM
Does it happen with Channel B??

I researched the relays in this circuit and it could be a faulty shorting relay (there are three). The channel A shorting relay is K34 (1FA), channel B is K36 (1FA). There is also a shorting relay between A and B, K33 (1FA). These could be damaged from a surge through the probes. It could also be the switching relay (switches A and B), K35 (2FA).
#49
Out of Production Hardware / Re: ProTrack I, hi Freq, hi ...
Last post by Al1234 - November 20, 2023, 03:17:04 PM
Thank you
#50
Out of Production Hardware / Re: ProTrack I, hi Freq, hi ...
Last post by admin - November 20, 2023, 02:17:13 PM
The slight angle at 100Kohms at 5KHz is pretty much normal as it was difficult to compensate for low level capacitance on an analog CRT. With the current digital Trackers it is not an issue.