9.Now you must remove the switch card assembly so that you can check and, if necessary, change the settings of the internal switches. To remove the switch card assembly:

a. Refer to Figure 15.

1

Figure 15. Unscrewing the Thumbscrew on the Switch Card Assembly

b. Unscrew the thumbscrew 1.

Installing a 2104 Model DU3 21

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IBM DU3 manual Unscrew the thumbscrew 1