IBM 6500-V5P Maintenance Manual - Page 127

Operator Panel Message 148 DRIVER CIRCUIT BAD SEE USERS MANUAL Display Messages Table 3. Message List Explanation Corrective Action The hammer coil count test failed. 1. Cycle power. If the message appears, press STOP. 2. Check the shuttle for electrical shorts (page 252). 3. Power off and unplug the printer. Remove the shuttle cover. At the shuttle frame assembly, disconnect the hammer bank logic and power cables. Plug in the printer and power it on. If "HB NOT INSTALLD" appears on the LCD, the controller board or microcode is suspect. Do the following: 4. Save the printer configuration values. (Refer to the User's Manual.) 5. Clear NVRAM (page 237). 6. Download and install the latest code from IBM First (page 231). 7. Power on the printer in download mode and load flash memory (page 238). a. If you encounter loading problems, go to the appropriate error code for resolution. b. If you encounter the failure or message that brought you to this procedure, replace the controller board (page 319). After replacing the controller board, DO NOT make the printer READY, but proceed immediately to the next step. 8. Download and install the latest code from IBM First (page 231). 9. Power on the printer in download mode and load flash memory (page 238). 10. If you encounter the failure after replacing the controller board, reinstall the original controller board and contact your DDS and Second Level Support. 127