A Peek Inside a Keurig K80

 Here's a quick look at the control board of a Keurig K-Select K80 single cup coffee maker.

This unit has been problematic over the last year or two. It occasionally turns off during the heating cycle, sometimes as many as three times in a single cycle. Fortunately it only turned off once or twice during the brewing cycle - otherwise it would have been gone a lot sooner. We paid about $119 or $129 for it (US$). I replaced it with a Cuisinart SS-10 for $149 - more on that later.

Anyway, here's the K80 control board.

K80 Control Board

It's way better than I expected. Decent layout though with no routed line voltage gap. The quality of the components, most notably the electrolytic caps, is good except for perhaps the relays. There's a flat flex cable connection from the top left to the button & LED interface, and JST connections to the water and temperature sensors, pumps, etc. There's a connection point for serial debugging and a few dedicated test points. Everything was clean, including the tubing (whew!).

As for some of the ICs, there's a Microchip PIC32MX130F064D-I/ML microcontroller, a Fujikura FPN-07PB pressure sensor, a Lite-On MOC3063 opto-isolator triac, and a WeEn BTA316B-600B0 triac. Relays look like Hongfa HF3FD 012-H3F(245)(247).

I didn't find any connection faults to repair so I probably won't delve into this any more.

As for the Cuisinart unit, it heats the water in-line rather than use a tank so it starts brewing almost immediately. We're very happy with the new coffee maker. My past experience with Cuisinart has been exceptional. On the rare occasion when something broke on one of our Cuisinart appliances, their customer service reps have been very accommodating, e.g., "We'll get that out to you right away ... no charge". Can't beat that.