HP M3027 Service Manual - Page 245

Early-boot diagnostic test The device runs several formatter self-tests when power is turned on. The sequence of tests and poweron events is shown below. 1. Power on 2. Early boot 3. Memory test 4. Initialization (formatter support package) ready 5. Power supplied by line to power supplies, fans on 6. Control panel 7. Control panel LEDs 8. Memory count 9. HP "blooming" logo If the power-on sequence stops with no control panel display, check to see if any of the control-panel LEDs are on. 1. Note which LEDs are on and which LEDs are off and compare the combination to Table 6-4 Early- boot diagnostic test on page 233. Table 6-4 Early-boot diagnostic test Test A B C D Ready Data - - + - - + + + Attention - - - - Test E F G H Ready Data - - + - - + + + Attention + + + + 2. Turn the device off. 3. Reseat the formatter and make sure that all formatter connectors are seated correctly. 4. Remove any installed memory DIMM (especially if the combination of LEDs indicated LED status D, E, F, G, or H). 5. Check control-panel connections. 6. Turn the device on. If the power-on sequence fails again and the combination of LEDs is the same combination of LEDs as the first time it failed, replace the formatter. NOTE If the device passes the early-boot diagnostic test, the formatter is working correctly and should not be replaced. ENWW Troubleshooting tools 233