Service manual

REV.-A
5.1 Overview
The FX-870/l 170 may exhibit different symptoms for the same problem. This makes troubleshooting difficult.
This section provides simple and effective ways to facilitate troubleshooting. The following flowchart
illustrates the main steps of the troubleshooting process.
T
START
1
r
I
I 5.3 I 5-1o
I
5.4 15-10
5.5
5-13
~ The problem is corrected. ]
Figure 5-1. The Troubleshooting Procedure
The following tables provide troubleshooting information.
Table 5-1. Motor and
Printhead Coil Resistance
Part
Coil Resistance
Motor Assembly, CR
5.0 ohms
+/- 77. at 25 degrees C (77degrees F)
CN13 on the main board 1,2,3, 4 pin@ phase A,
~, B, ~
I
Motor Assembly, PF
63 ohms +/-3 ohms at 25 degrees C
(77degrees F)
CN6 on the main board 1,2,3, 4
pin~ phase A, ~, B, ~
Printhead
16.5 ohms +/- 1.6 ohms at 25 degrees C (77degrees F)
(Refer to Figure 5-2. of the head wire arrengement.)
5-1