
- 17 -
5 Defective line feed.
• Do signals of LFDV (Driver board) such as A1, A2, B1 and B2 have the waveforms shown
in Fig. 11?
A1 (LFDV-3 pin)
A2 (LFDV-7 pin)
B1 (LFDV-8 pin)
B2 (LFDV-12 pin)
+40V
0V
+40V
0V
+40V
0V
+40V
0V
4.44 ms
2.22 ms
A1
A2
B1
B2
Forward Reverse
• No Replace LFDV.
LFDV (Driver Board)
When it does not work properly, replace Q501 or the Driver Board.
▼
• Yes Is the flexible cable connected without break?
• No Replace the flexible cable.
▼
• Yes Is the CN4 of the Driver Board broken?
• No Replace CN4
▼
• Yes Replace the LF motor.
Fig. 11
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