Service manual

Ch 93 HI Measurement 1. Make Hardware Connections
• Turn mainframe power OFF
• Connect DMM leads as shown in Figure 2-6
• Turn mainframe power ON
2. Measure Channel 93 HI Resistance
• Send *RST to multiplexer
• Send CLOS (@nn93) to close chan 93, where nn = card # (omit
leading zeroes in nn )
• Trigger the DMM with TRIG SGL and note reading
• Send OPEN (@nn93) to open channel 93
• Subtract measured value of (R38 + R43) from DMM reading
• Enter the result in Table 2-2 for Channel 93 HI
Figure 2-6. Ch 93 HI Measurement Connections
2-8 Verification Tests