LQ-300 Service Manual
Troubleshooting
Motor
Connector
Number
CR Motor
(CN2)
PF Motor
(CN3)
CS Motor
(CS
Board
Assembly)
Table
5-3.
Motor Coil Resistance Test Points
Common
Pin
Number
3
3
5
Sensor Connector
Number
HP sensor
(CN8)
PE sensor
(CN7)
Release Lever
Position Sensor
(CN9)
Platen Gap Sensor
(CN1O)
Color Ribbon
Sensor
(CS
Board
Assembjy)
Test
Pin
Number
1,2,4,5
1,2, 4,5
1,2,5,6
Test
Method
(Set Meter
to Ohms. Disconnect
Motor from Main Board and Check it
with Printer Power Off.)
Place one lead on pin 3 and the other
lead on each of the 4 test pins to check
the two motor
Dhases.
Place one lead on pin 3 and the other
lead on each of the 4 test pins to check
the two motor phases.
Place one lead on pin 5 (brown) and the
other lead on each of the 4 test pins to
check the 4 motor phases. (Pin 3 is a
common pin.)
Meter Reading
19.6f2
k
8?X0
(at
25° C, 77° F)
58.5Q
+
s~o
(at
25° C,
77°
F)
150Q
f
5% (at
25° C, 77° F)
Table 5-4. Sensor Test Points
Test Method
Set Meter to Ohms. Check Printer witt
Power Off.)
Place one lead on pin 1
and the other
lead on pin 2. Toggle the sensor position
Plaoe
one lead on pin 1 and the other
lead on pin 2. Toggle the
sensor by
inserting
and removing a sheet of
paper.
Place one lead on pin 1 and the other
lead on pin
2.
Change the paper-release
lever position.
Place one lead on pin 1 and the other
lead on pin 2. Change the paper-release
lever position.
Place one lead on pin 1 and the other
lead on pin
2.
Toggle sensor position.
Method Reading
Meter should toggle between
oDen
and shott.
(ODen
= home.)
Meter should toggle between
open and short. (Open = paper
installed.)
Meter should toggle between
open and short. (Open =
continuous paper.)
Meter should toggle between
open and short. (Open = platen
gap lever position 2 -6)
Meter should toggle between
open and
shott.
(Open= active.)
Table 5-5. Error State Indication
Error Indication
Error Status
Cause
The printer beeps
(**o)
Paper-out Paper is not installed
and the PAUSE light
error.
blinks
The printer beeps (---
)
Operating
. The release lever is set to the TRACTOR
and the PAUSE light
error. position before the cut sheet is ejected.
stays on
. The release lever is set to the FRICTION
position before the continuous paper is ejected.
Fatal error.
Power supply voltage is abnormal.
Notes:
(*)
Theprinterbeeps
for 1/10 ofa second with a
l/10-secondpause.
(-)
The
pfinterbeeps for
1/2
of a second with a l/10-second pause.
Rev.A
5-3
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