The guts contain six major assemblies: the rear outlets, a combined phone and coax surge suppression board, the motherboard, the LCD and control module, and the transformer. The transformer alone occupies about one-third of the total internal volume; the battery compartment accounts for most of the rest. I have mixed feelings about how tightly packed the wiring is between the phone/coax board, the transformer and the main board.
Remember a bunch of slides ago when I asked if you could guess where all the idle waste heat was coming from? If you guessed the motherboard, you guessed wrong. It is the transformer. Why is the transformer heating up so much? We'll see soon enough.
Reinforcement ribs inside the housing look similar to the LX. But with half the depth and less than half the battery weight to contend with, Tripp-Lite's implementation feels much sturdier. You can also see that the screw wells have two or three reinforcement walls connecting them to other surfaces for additional structural strength. The company is not taking chances with shafts breaking off from the side panels. Mechanically speaking, the SMART1000LCD should survive getting kicked around quite well.
Another minor disappointment is that spade terminals and their associated crimped connectors were apparently too expensive for Tripp-Lite to use in this model, except for the ground wire. Instead, the company crimped solder cups to the wires to facilitate insertion and provide some degree of strain relief, and then soldered those directly to the board. This means I am either stuck with everything getting in the way for the remainder of this tear-down or having to de-solder wires.
Of course, this assembly technique is perfectly fine for a regular end-user who doesn't plan to open their UPS.
Behind The Rear Cover
Just like the LX, the “Surge and Filter Only” outlets are wired directly to the cord. At least the cord’s wires loop a few times around a common mode choke before getting crimped to the outlets and main board wires. That’s slightly better.
Also like the LX, the SMART1000LCD has plastic covers behind its outlet strips to secure them in place, prevent foreign objects from poking in any farther than that and reduce the likelihood of shorts between strips. Covers hide the usual complement of stamped metal strips: pinchy fingers for the live and neutral contacts, torque flaps for the grounds.
Coax And Phone Surge Protection
To save space and cost, both coax and phone protection are implemented on the same circuit board. Phone protection is handled by a pair of Maida Z151-09 MOVs (150VAC, 9mm) and series fuses, while coax protection is done by shielded can magic that I'm not going to get into.
According to the main board’s silk screen, the UPS should have a pair of 40A fuses for the battery. Instead of putting them on the board, though, they appear to be soldered in-line with the battery’s negative cable. Each fuse has its own wire to the PCB and the whole thing is covered in two layers of thick heat-shrink tubing.
Transformer, Heater In Disguise
This transformer has one center-tapped winding connected to battery positive for the inverter’s drivers (which needs three wires), one winding for the AVR buck/boost and inverter output functions (which need another three wires), and a seventh wire that goes unaccounted for in this tally. Care to guess what it is for? Here is a hint: it is part of the reason why the transformer is running continuously whenever the UPS is turned on.
Apologies for the cluttered view. I did not want to de-solder a dozen wires, especially when there's a high probability I will return the unit for a refund.
I thought the LX’s motherboard looked simple, but Tripp-Lite takes simplification another step further. In the top-left corner, we have all the line voltage wire connections and associated components. The bottom-left corner contains a small buzzer and the panel connector, while most of the middle is covered in jumper links. The right third is dominated by a pair of aluminum slugs with a pair of FETs each for the inverter driver, along with a handful of filter caps.
There is one major function missing from this description. Can you identify it before the board tour is over?
May The Glue Be With You
Tripp-Lite did not want the front panel connector popping out during shipping or, more likely, from someone pulling a little too eagerly on the panel while changing its orientation. This is one of the biggest globs of glue I have seen on a connector in a while. The rubbery adhesive would not come off without a fight, so I decided to leave it alone. That’s one more component I will have to continue tossing left and right as I explore the board.