Service manual

3. Repeat for Channels 01 - 07 LO and Channel 90 LO
– Repeat steps 1 and 2 for channels 01 - 07 LO and 90 LO
– Use CLOS (@nncc) and OPEN (@nncc), where nn =
card # and
cc = channel # (omit leading zeroes in nn)
– For Channel 90 LO, subtract combined value of R21 + R27
Ch 00 - 07 and 90
GU Measurements
1. Make Hardware Connections
– Turn mainframe power OFF
– Connect DMM leads as shown in Figure 2-5
– Turn mainframe power ON
2. Measure Channel 00 GU Resistance
– Send *RST to multiplexer
– Send CLOS (@nn00) to close chan 00, where nn = card #
– Trigger the DMM with TRIG SGL and note reading
– Send OPEN (@nn00) to open channel 00
– Subtract measured value of R22 from DMM reading
– Enter the result in Table 2-2 for Channel 00 GU
Figure 2-4. Ch 0-7 and 90 LO Measurement Connections
Figure 2-5. Ch 00-07 and 90 GU Measurements Connections
26 Verification Tests Chapter 2