Epson LQ-300 Service Manual page 86

Troubleshooting
Figure 5-2. Printhead Connector Pin Alignment
I I
(Set Meter to Diodes. Check wfth Power Off.)
PF Motor Driver Cheek from base to ooliector and from base to
(Q2, Q3, Q4, Q5 emitter.
Reverse leads and test again.
(Emitter and base are marked on the main board
assembly.)
5-2
Head
311 219
Head
5 1 13 921 17 C C C 2416 12 8 20 4
Table 5-2. Motor Driver Test Points
Test Method
Pin No.
7 C C C 22151823 10 14 6
Pin No.
View A
I
The reading should be
neither open nor shorted
from base to collector or
base to emitter.
T
T
C: COMMON
Meter Reading