Service Operations and Testing
Testing the Indicator
VT400 Technical Manual, Rev. A5 58 Doc # UM-VT400-EN
To unlock keys:
1. Access the setup menus and navigate to SETUP > SETUP 1.
2. Set the corresponding parameter to 0 (see the bulleted list above).
8.2 Testing the Indicator
8.2.1 Testing ROM/RAM Integrity (Function 86)
From time to time, it is advised to check the integrity of the unit’s ROM and RAM
using the procedure below.
To test ROM/RAM integrity:
1. Access the function menu and select function 86.
2. One of the following messages are displayed:
Err 01 – indicates that ROM data is corrupted.
Err 02 – indicates that RAM data is corrupted.
PASS – indicates that both ROM and RAM memory is okay.
8.2.2 Testing the Keypad and Display (Function 90, 91)
To test that the display is working properly:
Access the function menu and select function 90. All digits display 0 through 9, in
sequence, and then all characters are displayed in sequence.
To test that the keypad is working properly:
Access the function menu and select function 91. The display blanks. When you
press a key, the scan code for that key is shown on the display. The scan codes
are as follows:
32 – TARE.
33 – P.TARE.
34 – PRINT.
35 – TOTAL.
36 – FUNCTION.
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