Service manual

Ch 93 LO
Measurement 1. Make Hardware Connections
• Turn mainframe power OFF
• Connect DMM leads as shown in Figure 2-7
• Turn mainframe power ON
2. Measure Channel 93 LO Resistance
• Send *RST to multiplexer
• Send CLOS (@nn93) to close chan 93, where nn = card #
• Trigger the DMM with TRIG SGL and note reading
• Send OPEN (@nn93) to open channel 93
• Subtract measured value of (R39 + R42) from DMM reading
• Enter the result in Table 2-2 for Channel 93 LO
Figure 2-7. Ch 93 LO Measurement Connections
Verification Tests 2-9