IBM 4247 Maintenance Information page 165

T&D03 - Not Used
Press the Micro key to bypass this message.
T&D04 - Microcode Test
Display:
T&D 04 CRC FONT *
Note: The asterisk will flash during the test.
If an error message is displayed, go to "T&D Error Messages and Actions" on page 190. The test completed
successfully if the display advances to the next test number.
T&D05 - Operator Panel LED and Key Test
Display:
T&D 05 USER
1. All of the LEDs will switch on at the same time.
2. Next, beginning at the top, each LED will flash on and off once with a buzzer sound.
3. After the LED test, the following message will be displayed:
PRESS KEY 1 -->
4. The key is good if the display advances to the next key number.
5. Press key 1 (shown below).
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Chapter 2. Diagnostics