Specifications

Table 5–1 (Cont.): Problems and Possible Causes
Problem Possible Cause
Shuttle malfunction 1. Print actuator module (replace)
2. SHAD
3. SMMC
4. Shuttle motor
5. Cable assembly 19
Missing dots, light
printing over portion
printing area
1. Print actuator module (replace)
2. SHAD
3. SHAD to print module cable assembly 19
Printing too light or
heavy, lighter at one
end, poor quality
1. Print module - striker bar gap adjustment
Ribbon will not advance 1. Ribbon off guide rollers, jammed or misrouted
2. Ribbon cartridge
3. Ribbon drive motor
4. Cable assembly 17
5. SMMC
Fan control malfunction
or fans inoperative
1. Fan
2. SMMC
3. Loose or defective fan cable
Slow printing 1. Thermal throttle senses high temperature due to
prolonged high density printing (no
corrective action required)
5.2 Diagnostic Self-Tests
The LG31 printer automatically initiates diagnostic self-tests at power-
up, and after the ASCII print test.
5.2.1 Initiating Diagnostic Self-Tests
The diagnostic self-tests are the most powerful tool for isolating a faulty
FRU. When the LG31 printer is powered up or when the ASCII print
test is stopped, the printer automatically initiates diagnostic self-tests
as defined below:
5–6 TROUBLESHOOTING