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4.2.7 Motor Checkout Procedure
(50, 100, and 155 Ipm)
Note:
Perform the following procedures when
checking either the type belt motor or the
carriage motor. A chart is shown for each motor.
The resistance values are nominal values and
might vary because of the ohmmeter. A com-
parison between the components in the circuit
being checked is the best indication of a defec-
tive component.
1.
Turn power off and remove the printer
covers.
2.
Open the printer card gate and lock it in
the open position. Remove the bottom
cover.
3.
Remove the driver card 13E.
4.
Set the ohmmeter to the Xl scale.
5.
Disconnect the plug from the motor to
be checked. Measure the resistance be-
tween the plug pins as shown in the charts
. on this page.
6.
Check continuity of phase lines from
driver card to motor plugs.
7.
See the following list of removals and
replacements and replace any defective
component.
Type belt motor removal and replacement
(4.2.15).
Carriage motor removal and replacement
(4.2.40).
Motor resistor removal and replacement
(4.2.9).
Motor phase capacitor removal and replace-
ment (4.2.8).
Type Belt Motor (50, 100, and 155 Ipm)
Motor End
Resistance
Component
Plug Pins
Values
l
Description
A
B
5 and 1
2.6 ohms
1.2 ohms
A-phase
5 and 2
2.6 ohms
1.2 ohms
NotA
6 and 3
2.7 ohms
1.2 ohms
B-phase
6 and 4
2.7 ohms
1.2 ohms
Not B
Cable End
Resistance
Component
Plug Pins
Values
l
Description
A
B
7 and 5
6 ohms R2
4 ohms R2
A-phase common
resistor
8 and 6
6 ohms R3
4 ohms R3
B-phase common
resistor
1 and 2
C3
2
C3
2
A-phase capacitor
3 and 4
C3
2
C3
2
B-phase capacitor
Phase
Plug
Checked
No.
Driver
A
P4-1
13F42
(not) A
P4-2
13F49
B
P4-3
13F44
(not) B
P4-4
13F45
A (com)
P4-7
13F62
B (com)
P4-8
13F64
lit your printer has 3
Ilf
capacitors C3 and C4 and type belt motor,
part 1800535, use column A.
If
your printer has 10
Ilf
capacitors C3 and C4 and type belt motor,
2Part 1816039, use column
B.
For location of C3 and C4, see 4.3.3.
Set ohmmeter to 1 K scale. The ohmmeter needle must go toward
zero and back to infinity. Failure to do so indicates a defective
capacitor.
Belt Printer
50, 100, and 155 Ipm
4-23
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