IBM 5150 - Page 157

Error
Description
Diagnostic Action
Forms Do
8.
Position Printer Power switch
to OFF.
Not Advance
Advance forms by turning forms advance
knob. Check intermediate gear for worn
or
Overprin ting
broken teeth. Replace gears
if damaged.
Check left and right tractors for broken
Forms
feedpins. Replace
if broken. (See Section 3,
Jamming
or
"Removal/Replacement. ")
Tearing
9.
Check for 45 ohms resistance on forms feed
motor coils between pin CN 6-14 and pins
CN6-25, 26, 27, and 28 on Driver Circuit
card (see Section 5, "Locations").
Resistance
=45 ohms?
YES:
Check for +24 Vdc at CN3-18. (See
Section 5, "Locations.")
+24 Vdc?
YES:
Replace both Control cards
(see Section 3, "Removal/
Replacement").
NO:
See page 1400-6, "Power
Supply Check."
NO:
Replace Print Mechanism assembly
(see Section 3, "Removal/
Replacement").
1400-16