A look at the Panasonic TU-DSB40

Panasonic were one of the major manufactures of Sky Digibox’s, and were considered to be one of the more reliable makes in terms of reliability and performance.

The front panel is typical of the average Sky box of the era, 4 led lights followed by 9 front panel buttons along with two card slots.

A loot at the system details screen, showing the software and revision information

Lifting the Lid

A very clean design, similar to the 2500S5

On the left you can see the main CPU and MPEG2 decoder, seems to be a custom Panasonic MN2 processor (MN2WS0002AD). Whilst I’ve not been able to find a lot of detail on it online, It’s a lot faster than the ST 5512 found in the Pace 2500S5

Not sure about the Panasonic chip towards the bottom, the MN7D022B3M, nothing much turns up online. Not much can be found with the Conexant chip either (SMARTSCM/336 CX88168-12) however one MAME driver source page has it down as a modem

Second card slot

Another view of the MN2 chip with the flash rom (bottom) and memory (Samsung chip next to the MN2)

Main central processor MN2WS0002AD, Looks like it’s missing a heatsink, or maybe Panasonic figured it didn’t need one. Most likely Sky winged about the price so Panasonic had to cut corners. Still the box feels cool to the touch when in use.

The front panel removed

Vs Pace 2500S5

Vs Pace Di4000N

Conclusion

The DSB40 comes from the same generation of digibox as my 2500S5, yet it feels so much faster in operation thanks to its processor. I’m not sure why Pace held onto the St5512 for so long when over digibox’s were moving onto more capable processors. Unfortunately I’m not able to find any further information regarding Panasonic’s MN2 chips that they used, only that they were used for Directv and OpenCable boxes also, and they were mostly MIPS based designed like the NEC EMMA used on some digibox’s.

Then again this box is running older software, maybe the later versions were more demanding?

The only major issue the the telephone cable connector, once you insert the wire, its suck to the digibox and cannot be removed without removing the back panel. I’m not sure why this is, if the connecter was mismatched for the case or maybe it was a cost saving design.

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