Epson FX 1170 Service Manual - Page 120
TIME= O.2ms, Table 5-5. Repairing the BOARD ASSEMBLY, C094
 |
View all Epson FX 1170 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 120 highlights
REV.-A Table 5-5. Repairing the BOARD ASSEMBLY, C094 MAIN (Continued) Problem Self test printing abnormal Symptom Cause The printer IC4 is does not defective. print the self test. Checkpoint Check the head pulse signal at pin 31 (input) and pin 63 (output). Solution Replace IC4. I (CH2:P IN 31) ~~ i ! II e I ~ .W - ! ~ ~~ I f I !1 ~~* - [ ( I I I I I I II I I I I I ! I II 1 II I II II I I I I I I I I I 1 I , ( CHI:PIN 63) ~ ~m % \I ff 4 ~ ~m ! -~ ,m ~: $$ *n 9 * - 9w W 9 CH1=5V CH2=5V 1 11 1 TIME= O.2ms 1[ Self test Jrinting ~bnormal. A particular dot fails to print. One of the Check the head drive signal at the base and the head drive emitter of each transistor. transistors is defective L J- (Q2, 4,5,6, 4CH2:Emitter) 8,9, 10, 11, or 12). * J b m -E m 9m - -- % - 7.i # I I I I I I I I II I 1 I I 1 b +-Ii-& +1+-1- -+-H+ U+t -W+ - H - t (CHl:Base) * I 9 ~ If the signal at the base is normal, repiace the transistor. Otherwise, replace IC4. CHl=2b CH2=50V 1 1I[ TIME=O.5ms 1 I 5-16
-
1 -
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
-
36
-
37
-
38
-
39
-
40
-
41
-
42
-
43
-
44
-
45
-
46
-
47
-
48
-
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
-
58
-
59
-
60
-
61
-
62
-
63
-
64
-
65
-
66
-
67
-
68
-
69
-
70
-
71
-
72
-
73
-
74
-
75
-
76
-
77
-
78
-
79
-
80
-
81
-
82
-
83
-
84
-
85
-
86
-
87
-
88
-
89
-
90
-
91
-
92
-
93
-
94
-
95
-
96
-
97
-
98
-
99
-
100
-
101
-
102
-
103
-
104
-
105
-
106
-
107
-
108
-
109
-
110
-
111
-
112
-
113
-
114
-
115 -
116 -
117 -
118 -
119 -
120 -
121 -
122 -
123 -
124 -
125 -
126
-
127
-
128
-
129
-
130
-
131
-
132
-
133
-
134
-
135
-
136
-
137
-
138
 |
 |
