First Page Of Self-Test - Intermec 6820 Series User Manual

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Chapter 7 Troubleshooting and Diagnostics
The printer model number is given on line 1 (first line). This identifies the printer type used, in this case the 6820.
The 8-digit serial number of the printer is listed on line 4 under the "Serial#" heading on line 3. The serial number is
also on the inside of the printer. In portable printers, raise the printer mechanism to look for the number on the inside
back wall.
"Battery Voltage," on line 13, gives the input voltage sampled at the beginning of the self-test. The input range must
be between 7.5 and 15 volts. The input voltage must be greater than 10.5 volts to charge the internal battery. At 7.5
volts or less, the LOW BATT LED is turned on and the printer goes to sleep immediately. Apply external power to
wake the printer to print. At 10.5 volts or less, the LOW BATT light comes on but the printer still prints.
The "Auto Feed" setting, on line 16, is a configurable item. "CR" Carriage Return means no auto linefeed. This is the
most common setting for applications using NPCP. "CR+LF" means a linefeed will be added to each CR. This setting
can produce double-spacing of reports. See page 31 for information on changing this configuration.
The "Interface Mode" setting, line 17, lists the interface protocol for the printer. The typical setting is NPCP. Others
include DTR with no, odd, or even parity, and IrDA. See page 31 for additional information.
"Bit Rate" on line 18, lists the baud rate for the printer. Most application software autobauds so you do not have to
select it. Bit rate is commonly set to 19200 (19.2K) or 9600 bps. See page 32 for additional information.
"A2D History," lines 21 through 25, is the history for voltage measurements and temperature measurements, as re-
corded by the printer.
"Head Jam History" on lines 26 through 29, gives information on head jams. If the printer is having frequent head
jams, these lines can assist in determining the problem.
Under the "Home" header, if "Err" is listed, then the home position LED sensor has failed.
"Command" tells which printer command was executed when the head jammed.
"Direction" tells which way the head was moving, "left" toward home and "right" away from home. Home posi-
tion is at the extreme left, toward the green thumb wheel.
"Speed" is the acceleration speed of the print head when the jam occurred.
"Step" is the acceleration step at the jam. "0" means no steps were taken, "15" means all steps were taken. "1–14"
means printer jammed during acceleration or deceleration.
"Temp" is the ambient temperature at the last head jam. The temperature is listed in Celsius.
"Position" of carriage at the jam in 1/720 inches = 12 * step position. Divide the number by 12 to get the step
position. There are 512 steps across the page. If it is jammed at position 0, check the printer mechanism align-
ment. If it is jamming in the middle, it is more likely a dirty ribbon or obstruction in the print head's path.
"Head Dot Pattern," line 37, is printed to verify the individual dot wires. There should be nine dots. If some are miss-
ing, it could be a print head failure or a circuit board failure.
120

First Page of Self-Test

The self-test report is divided into sections. Refer to pages 121 and 122 for
a sample printout.
6820 Series 80-Column Printer User's Manual