2500 SX/25 (250-1610) SETTINGS Faxback Doc. # 1123 The video DIP switch (SW1) on the main logic board has two switch positions (1 and 2) that you can change. The following table shows the different settings for switch numbers one and two: SW1 Switch Settings Switch # Feature Description Switch Setting 1 Video Interrupt IRQ9 Disable* OFF Enable ON 2 On-board Video Enabled* OFF Disable ON *Indicates the factory setting. AUDIO JUMPER SETTINGS Function Description Jumper Settings Audio Input Microphone* E24 and E25 installed Source Line-Level E25 and E26 installed Audio Output Headphone* E28 and E29 installed Source Line-Level E29 and E30 installed *Indicates the factory setting.