Daily maintenance and component upgrades of ThinkPad P73 can mostly be done by opening the base cover of its body base. The bottom cover is locked by seven screws.
After loosening the screw, the bottom cover can be removed by gently prying it up the bottom cover in the direction shown below. It will be found that all the seven screws are designed to prevent throwing and are attached to the bottom cover without removing it.
The back of the bottom cover is made of metal silver, which is marked with aluminum material, and two fillet drainage holes in the middle. There is two grid grille covering the metal in the upper right corner, which is used for cooling the main board parts (M.2 slot and memory slot). The black sponges in the lower-left corner and the lower part are used for fastening and buffering the 2.5-inch hard disk and battery respectively.
However, the fuselage base is made of aluminum and magnesium alloy (the top cover is aluminum), which will bring better rigidity, stability, and heat dissipation.
Although the appearance of the screen cover and the body base is the same color, there are obvious differences in material quality from the angle of the following figure.
The left two vertical slots with 0 and 1 labeled on the upper edge body are the two M.2280 SSD slots of P73, and the next two transverse slots are the memory slots. They are covered with black insulating paper.
The factory pre-installed 1TB M.2 NVMe SSD is installed in the 0 slot. The model is Samsung PM981a.
Since the 2.5-inch hard disk is not pre-installed in the factory, there are two buffer sponges in the 2.5-inch hard disk compartment in the lower right corner. There is neither a hard disk shelf nor a cable for the motherboard that is required for the 2.5-inch hard disk.
This P73 has four memory slots, two DDR4-2666 ECC memory pre-installed in the factory, which is installed in two memory slots under the keyboard, so the two memory slots at the bottom of the fuselage are idle:
The P73’s battery is the same as the P72. It is a built-in battery and does not support quick release. It has four screws to fix it
The battery is connected to the mainboard through a 12-wire cable. The connector is easy to plug and unplug. It is better than the DELL Precision 7740 battery connector and does not look as vulnerable as the 7740.
There is a fuselage bottom cover open state detection switch next to the battery connector plug, which uses a simple physical method to detect whether the bottom cover is properly installed. If the detection cover is not installed in place (or the switch fails), I encountered it once on X1C 2015 a few years ago and refused to power on.
Firstly, a 1TB M.2 SATA SSD was installed in the No. 1 M.2 SSD slot. When the black insulating paper was uncovered, it was found that the silicone pad had been placed in the slot. Looking at the position and thickness of the pad, it did not seem to be used to put it above the flash memory of the M.2 SSD.
Looking at the factory-installed M.2 SSD, the same grease pad is placed under the SSD. It turns out to be supporting, so it seems that if you want to install a double-sided flash design like the Samsung 960Pro 2TB M.2 SSD, you must remove this grease pad.
Since it was not anticipated that the P73 did not have the SATA cable to install a 2.5-inch hard disk, I had to cancel installing the 2.5-inch hard drive.