IBM 6400-I15 Maintenance Manual - Page 95
Connect fan cables.
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107 HAMMER COIL HOT NOTE: The printer has sensor circuits that sample the operating temperature of key components of the print mechanism. When higher than normal temperatures are sensed, print speed is automatically reduced by 50% and a COIL HOT 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 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. One or more hammer coils are overheating. Inspect the printer environment for severity. (See NOTE above.) Advise the user to move the printer to cooler, cleaner location. 2. 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. 3. Power off the printer. Remove the paper guide assembly or pedestal top cover. Check all fan cable connections. Connect fan cables. 4. Power on the printer. Verify that all fans operate. Replace any fan that does not operate. 5. 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. 6. Install the paper guide assembly or pedestal top cover. Load paper. Run the "All E's" print test for 5-10 minutes. If the message appears, replace the shuttle frame assembly. 7. Run the "All E's" print test for 5-10 minutes. Troubleshooting 95