Vectronics PMT-228 User Manual download pdf (Page 12)

PMT-228 Instruction Manual Professor Morse

Self Test

A Self Test is included to perform testing of the display, the buttons, the non-

volatile memory (EEPROM) circuitry and integrity, and the audio circuitry. At

any time, turn off the power to stop the Self Test; however, power should NOT

be turned off during steps involving the non-volatile memory as it could corrupt

the memory.

This test is initialized by:

1. Turn off the power to the Professor Morse.

2. Press and hold only the Select button while turning the power on. The Self

Test starts by displaying the copyright message

"POCKET MORSE CODE

confirming the display is working properly. Release the button before the

message is finished.

3. It then automatically tests the logic line Vpp (shown on the schematic).

4. Each button is automatically tested for shorts to ground.

5. Next, it prompts to press each button in the sequence of Next, Previous and

then Select to test them for proper connections.

6. The non-volatile memory circuitry is then automatically tested. Notice this

step resets the Professor Morse to its factory default settings.

7. The non-volatile memory integrity is automatically tested.

8. When all is okay, a repetitive message

"PASS"

is displayed and sent to the

speaker. However, if something is wrong a repetitive message such as

"EEPROM FAIL"

is sent and displayed.

9. Turn off the power after confirming the audio has good quality.

Failure Message Meanings:

•

VPP FAIL

Logic line Vpp is not pulled low by a resistor.

•

NEXT FAIL

Next button is shorted or improperly connected.

•

PREVIOUS FAIL

Previous button is shorted or improperly connected.

•

SELECT FAIL

Select button is shorted or improperly connected.

•

EEPROM FAIL

Non-volatile memory circuitry is improperly connected.

•

MEMORY FAIL

Non-volatile memory is bad.

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Vectronics PMT-228 User Manual Page 12

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