StreetPilot 2720 diagnostic screen (& other useful functions)

 

While playing around with my SP 2720 I discovered a few potentially useful functions that can be initiated during startup. I'm not aware that anything like this has been previously posted here or elsewhere.

1) Powering up while holding the "Find" key:

Does a hardware reset after presenting a "Yes" or "No" screen. VERY useful for me as I'm hoping that it'll help with my SP forgetting its keyboard settings. Does anyone out there know of anything I could try to alleviate this problem?

2) Powering up while holding the "Menu" key:

Presents a very useful diagnostics screen entitled "General" that has the following information:

Product ID
Software version
Last Reset (time in seconds since the last hardware reset)
Current Time (time in seconds, GMT)
Temperature
Clock Frequency
Clock Drift
Signal (presumably strength of signal)
SNR (signal-to-noise ratio?)
Vexternal (DC voltage of the internal power supply)
Vphotocell (DC voltage of the internal photocell; neat!)
ID Pin Value (not sure of this; mine reads '1023')
RAM Test (either 'pass' or 'fail')
ROM Test (either 'pass' or 'fail')
IRDa Rx Test (test of the infrared remote sensor; mine says 'unknown')
Voice Count (number of installed voices, perhaps?)
Voice Checksum (a test for file intregrity?)

3) Powering up while holding the "Map" key:

Sets the unit to 'Autolocate Mode', whatever the heck that means.

3) Powering up while holding the "Speak" key:

Shows a small yellow box reading 'Holding' while you're holding the 'Speak' key but apparently does nothing. It powers up normally when you let go.

I hope this is helpful so someone out there ...

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Garmin nuvi 2597MT, 660, too many really.

StreetPilot 2720 diagnostic screen (& other useful functions)

2) Powering up while holding the "Menu" key:

I forgot to mention that the diagnostic screen also includes 'CPU Revision' (mine is 1.2), and 'Die ID 0' and 'DIE ID 1', both followed by 8 hexadecimal digits.

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Garmin nuvi 2597MT, 660, too many really.

It seems I posted too soon.

It seems I posted too soon. The diagnostic screen has several more pages of material with subsequent presses of the 'Menu' key.

The initial 'General' screen has four green dots in the bottom right corner corresponding to each individual key, apparently to determine functionality.

The second screen is really interesting, entitled 'Inventory' and it is just that. It lists the memory map of the unit, displaying memory area being used by each item, along with version numbers and CRC checksums. The 'Menu' key and the unit's remote can be used to page through several screens of material.

Next is a 'Play' menu which I haven't yet determined the purpose of.

There's an 'FM Modulator' screen (!) which must be used to control FM transmittal. It's followed by a 'Test Mixer' screen listing DAC, XM, and CMP settings. The XM bit must be for SP 2820's that have XM satellite radio capability. I don't know what CMP means yet.

A 'Tones' test frequency page follows, to test the audio. It's followed by 'VCOM PWM' which I haven't a clue about.

'Dead Reckoning' follows and it has a lot of data regarding gyro settings, bias settings, and other neat things.

The standard keyboard calibration screen follows and several video test screens are displayed to test the SP's graphics. It eventually wraps around back to the 'General'
screen.

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Garmin nuvi 2597MT, 660, too many really.