HP LaserJet 4 Service Manual - Page 249
SW601 Functional Check
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SW601 Functional Check 1 Open the Top Cover Assembly. 2 The message 12 PRINTER OPEN (or CLOSE PRINTER COVER) should appear. 3 Close the top cover. The 02 WARMING UP message should appear. 4 If the messages do not occur, check the switch actuator (see Figure 7-2, callout 1) on the top cover, and check that the plunger that covers the switch is in place (see also Figure 7-14 for switch locations). 5 Replace the Paper Control PCA. Figure 7-2 Location of the Top Cover Closed (SW601) Actuator Troubleshooting 7-19
SW601 Functional Check
1
Open the Top Cover Assembly.
2
The message
12 PRINTER OPEN
(or
CLOSE PRINTER COVER
)
should appear.
3
Close the top cover. The
02 WARMING UP
message should
appear.
4
If the messages do not occur, check the switch actuator (see
Figure 7-2, callout 1) on the top cover, and check that the
plunger that covers the switch is in place (see also Figure 7-14
for switch locations).
5
Replace the Paper Control PCA.
Figure 7-2
Location of the Top Cover Closed (SW601)
Actuator
Troubleshooting 7-19