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2 Only the POWER lamp lights. (The printer does not work.)
• Does the oscillating waveform from OSC of the Power & Control Board have the form
shown in Figure 1 below?
• No Replace OSC of the Power & Control Board.
▼
• Yes Does the RST-N signal have the waveform shown in Figure 2 below (with
+5 V and +8V signals as reference)?
Fig. 1
▼
• No If RS232C PCB is available, replace the RS232C PCB.
If the RS232C PCB is not available, replace the Power & Control
Board.
81.4 ns
V
(V)
T(ns)
+4 V ~ +5 V
0 V ~ 1V
+8 V
+8 V
+5 V
+5 V
0
0
0
+5 V
RST-N
Fig. 2
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