What I want to disassemble is a print server that cannot be fully powered. Its model is Linksys WPS54G (Figure 1). On a trip a few weeks ago, the name on my Mac OS X printer list showed that the WPS54G was offline and I couldn't connect it through a web browser. I think the reason is that it disconnected the wireless connection and needed to reboot after I got home to connect to the network again. But when I got home, I found that the WPS54G's top power LED and the Ethernet, wireless network and USB LED flashed alternately, and the color of several LEDs changed between green and orange. Restarting the print server failed to bring it back to normal operation and it was not possible to switch from a wireless connection to a wired Ethernet connection. Restored to factory settings, but it also has no effect.
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Figure 1: Linksys WPS54G print server.
I decided to disassemble this dead print server. Above the top system board, just below the USB, Ethernet, and power connectors, is a PCI-compatible NEC μPD720101 USB host controller (Figure 2). Compared to the older LPT protocol, the WPS54G connects to the printer via USB v1.1; some higher-end print servers support both connections. Another very obvious point is that the WPS54G offers both wired and wireless alternative network connection types; many other print servers (especially the same low-cost print servers that consumers love) support only one of the connection types. . At the bottom of the board you can see the cable connecting the rest of the system to the Wi-Fi antenna.
Figure 2: Front of the WPS54G print server board.
At the center of the top of the system board, there are two EM636165TS-616Mb SDRAMs produced by 钰创科技 along the left edge. On the right side you can see four LEDs that place the illumination on top of the device via plastic media. What are the two ICs in the center of the system board (one under the heatsink and the other under the metal shield)? I didn't try to open them to explore their secrets, in part because the heat sink was moved In addition, it is difficult to preserve the integrity of the IC package mark, I will explain other reasons later. Instead, I queried WikiDevi, this time unlike the last two WPS54G v1 and v2 product models. To be clear, I am using the v1 version (there is no v2 at the end of the model number).
According to WikiDevi, the IC under the heatsink in the v1 design is the 88W8510 produced by Marvell, half of the company's wireless access point and gateway "Libertas" chipset (for print servers). The multi-function 88W8510 directly controls the print server's 10/100Mbps wired Ethernet port, which together with the 88W8000G (or subsequent product) RF transceiver implements the WPS54G's 802.11b/g Wi-Fi capability. However, WikiDevi does not explicitly point out the companion chip under the metal shield in the v1 design.
Clicking on the WPS54G FCC report link pointed to on the WikiDevi page does not help much in identifying the IC designed for v1. But for the v2 follow-up product, just like the image you saw when you clicked the WPS54G link for the first time and then clicked on the Internal Photos Report, the FCC removed the heatsink (or maybe there is no heatsink in the v2 design) and removed it. The top cover of the Faraday cage. The Marvell 88W8510+88W8010 chipset combination is clearly visible in the picture.
The main IC on the back of the system board (Figure 3) is the Macronix MX29LV800TTC-70 8Mb parallel interface (x8 or x16) flash. By the way, I suspect that it is one of the two major factors that cause the WPS54G, and it is likely that a firmware bit (or several) has flipped, which prevents the device from starting and running properly.
Figure 3: Back of the WPS54G print server board.
But the firmware is not my initial doubt. The last question about TRENDnet's TEG-S8 eight-port GbE switch was suspected to be caused by a "wall plug" power failure. This time, I suspect that the front panel LEDs are lit, but there is not enough current output (to the required voltage level) to fully power the print server. This is another reason why I didn't open the radiator or remove the metal shield. There are many alternative PSUs available on the Ebay website. I hope that by purchasing a PSU, the WPS54G can be fully restored.
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