IBM 6500-V1P Maintenance Manual - Page 125

Operator Panel Message 147 H/B CONTROL MODE SEE USERS MANUAL Display Messages Table 3. Message List Explanation Corrective Action H/B = Hammer Bank. The printer has sensor circuits that continually sample the operating temperature of key components of the print mechanism. When higher than normal temperatures are sensed in one or more coils, print speed is automatically reduced by 50% and the H/B CONTROL MODE message is sent to the LCD to inform the operator. When the coil(s) cool down, print speed automatically returns to 100% and the message clears from the LCD. This message is normal for extremely dense print jobs, such as the Plot Test. If the printer often prints at half speed, it may be operating in a severe environment. A severe environment is one with an ambient temperature at or above 40° Celsius (104° Fahrenheit) or that is dirty enough to create blockage of the cabinet fan vents. The printer must never be run at ambient temperatures greater than 40° Celsius (104° Fahrenheit). If the printer is located in such an environment, relocate it to a cooler, cleaner area, or reduce the size and duration of the print jobs. 1. If the printer is a 1500 or 2000 lpm model set the coil temperature (page 383). 2. Inspect the printer environment for severity. Advise the user to move the printer to cooler, cleaner location. 3. Check the kinds of print jobs the user is running: look for very dense graphics and layouts. Advise the user to run jobs in smaller batches. 4. Power off and unplug the printer. Remove the paper guide assembly or pedestal top cover. Check all fan cable connections. 5. Plug in the printer and power it on. Verify that all fans operate. Replace any fan that does not operate. 6. Inspect vents and fan airways for obstructions. Look underneath cabinet models for items blocking the cabinet exhaust vents. Remove any obstructions from vents and airways. 7. Check the shuttle for electrical shorts (page 252). 8. Install the paper guide assembly or pedestal top cover. Load paper. Run the "All E's" print test for 5 to 10 minutes. If the message appears, replace the shuttle frame assembly. If the printer is a 1500 or 2000 lpm model set the coil temperature (page 383). 9. Run the "All E's" print test for 5 to 10 minutes. If the problem reappears, the controller board or microcode is suspect. Do the following: 10. Save the printer configuration values. (Refer to the User's Manual.) 11. Clear NVRAM (page 237). 12. Download and install the latest code from IBM First (page 231). 125