Spectratime / Temex LPFRS-01 / LPRO teardown photos

Here some photos taken during teardown of a defective unit I bought on ebay.

Case opened, be careful with the DB-9 attached to the flat-flex:


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Top side board:


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Bottom side board:


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Inside:


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Here is the output of a terminal session with the unit. The "M" command returns status information.

The column marked in red gives the Rb signal level. According to the manual, the level on a warmed-up unit should be between 1V and 3.3V, corresponding to between 33 and A8 hex.

As you can see it is to low with this unit.