GE MAC 600 SPY, Service Manual

Page: 33 / 127

Revision G MAC
TM
600 3-9
2047426-002
Troubleshooting: General Fault Isolation
Testing the Keypad
1. From the Diagnostics menu, select Keyboard Test .
The following window opens.
2. Press each key on the keypad and verify that the response appears in
the corresponding representation of that key on the screen.
When the corresponding key is pressed, a decimal value appears on
the screen. That will indicate whether or not the test has passed.
NOTE
Press Esc key in the end, as this will also exit from keyboard test.
See the following table for the decimal value matches that should be
present to pass the test.
Table 3-2. : Testing the Keypad
Key
Returned Decimal
Value
Returned
Character
Symbol on Display
Number key 1 49 1 1
Number key 2 50 2 2
Number key 3 51 3 3
Number key 4 52 4 4
Number key 5 53 5 5
Number key 6 54 6 6
Number key 7 55 7 7
Number key 8 56 8 8
Number key 9 57 9 9
Number key 0 48 0 0
Key Backspace 8 del
Function key F1 1 F1