SDS2000X Plus Teardown tips Most guidance required can be found in the SDS2000X Plus Service manual in Chapter 6 Disassembly Procedures from P48 on:
https://int.siglent.com/u_file/document/SDS2000X%20Plus%20Service%20Manual_SM0102XP-E01A.pdfNote, there are useful mentions of the number of screws to deal with at each stage and these help to reduce mistakes and confirm counts of fixings at each stage.
However, some color pics, specific tools required and a few hard earned tips never go amiss.
A single Torx T10 driver does most everything although it must be a long shank to reach all the rear cover screws. Tweezers and/or needle nose pliers are a must to manage screws as some are in recesses and prone to go walkabout into hard to access places. Stout long nosed pliers are required if you haven’t a 16mm deep reach socket for BNC socket nut removal and refitting.
On with the teardown…..this to replace the mainboard under warranty.
Getting to remove the mainboard is simple enough….just follow the Disassembly instructions however care must be taken with the ribbon cable connector for the front panel PCB.
It has a flip up latch that must be handled with care as to not break it and the next couple of pics show the latching mechanism open and shut plus the green hookup wire used to go fishing for the ribbon cable when it just won’t sit in an accessible position when refitting the new mainboard.
Encoder/keypad cable pics
There is just one other mainboard connection left, the double row socket with color coded wiring that includes some twisted pairs for the display driver board….another totally hidden surprise….more on this later.*
Removal of the mainboard first requires removal of the metal chassis it is mounted on so to access the 16mm fastening nuts on the BNC bulkhead fittings and you’ll already had to deal with 2 of these on the rear panel shielding and have found their tightness could be described as ‘just nipped’.
Removal of the mainboard chassis also entails removal of 3 hidden screws residing under what Siglent call the Channel Mask…..the adhesive vinyl overlay around the BNC inputs.
X Plus screws
Vinyl overlay X Plus
This is a properly awkward exercise and damage to the Channel Mask is very likely therefore a spare one should be ordered so to speed removal and reassembly.
Member
kcbrown carefully examined the placement of these 3 hidden screws and formulated a modification to structural fixings so these 3 screws did not require access to remove the mainboard chassis from the scope front housing. See these posts:
https://www.eevblog.com/forum/testgear/new-electricalcomputer-engineer-student-test-bench-equipment-recommendations/msg4124305/#msg4124305https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg4167997/#msg4167997By now we should have the mainboard chassis removed but always keep referring to the Disassembly instructions for the little things that one can easily overlook.
Just a few more screws and the front panel can be removed to expose the encoder/keypad and probe sense PCB which must be done to access the BNC nuts.
Front PCB’s
Don’t forget to remove the additional 3 screws from the probe sense PCB so to access the BNC nuts and FG BNC nut.
BNC nuts
While here we need look underneath.
Rear probe sense.
With the mainboard now dead simple to remove from its chassis let’s have a look at the side of it that hidden from teardown videos.
Mainboard Underside
While we have it apart this far let’s have a deeper look at some things….
Apart
A couple of screws hold the encoder/keypad PCB on and the underside is here with ribbon cables back to the mainboard and to the probe sense PCB.
Underside encoder keypad PCB
*At this point we can see a small bundle of colored wires, some are twisted pairs going under the chassis to the display and that is unusual as display connections are normally ribbon cables.
Just a few screws hold the display to the front of the chassis so at this point it would be rude not to investigate and it’s a good thing we did as the display PSU and driver PCB is not fully visible otherwise. Pic shows display backlight lead unplugged and its socket clearly visible.
Display driver
Reassembly is simple enough however 2 things in particular can be tricky, managing to keep the ribbon cable to the encoder/keypad PCB under control to have it accessible to plug into the new mainboard can be challenging and a plan to keep it under control or fish for it is worth developing.
Torx screw refitting management is challenging so to not have the little buggers get lost in the many crevices and spotting this standing out a mile had me devise a plan to keep control of them from the outset. These chassis fastening screws fix into the rear of the front panel, directly into the plastic and as the chassis they fasten is not very thick they tend to want to fall over and skate off to places unknown so with the tools at hand…tweezers and needle nosed pliers it was found needle tweezers held onto them really well but not like you might think…..the tweezer tips when trying to open held quite well enough to the inside of the Torx recess that it was possible to offer them to their position and wind them in a turn or so but after a reverse turn to have them drop into their previous fitting thread groove.
Tweezers
This all took a good couple of hours from start to finish with the tablet alongside for the frequent referrals to the Service manual. Best advice is don’t hurry and take a few pics to refer to for reassembly.