Service manual

3. Repeat for Channels 01 - 07 GU and Channel 90 GU
– Repeat steps 1 and 2 for channels 01 - 07 GU and 90 GU
– Use CLOS (@nncc) and OPEN (@nncc), where nn =
card # and
cc = channel # (omit leading zeroes in nn)
– For Channel 90 GU, subtract combined value of R22 + R28
Ch 08 - 15 and 91 - 92
HI Measurements
1. Make Hardware Connections
– Turn mainframe power OFF
– Connect DMM leads as shown in Figure 2-6
– Turn mainframe power ON
2. Measure Channel 08 HI Resistance
– Send *RST to multiplexer
– Send CLOS (@nn08) to close chan 08, where nn = card #
– Trigger the DMM with TRIG SGL and note reading
– Send OPEN (@nn08) to open channel 08
– Subtract measured value of R23 from DMM reading
– Enter the result in Table 2-2 for Channel 08 HI
3. Repeat for Channels 09 - 15 HI and Channels 91-92 HI
– Repeat steps 1 and 2 for channels 09 - 15 HI and 91 - 92 HI
– Use CLOS (@nncc) and OPEN (@nncc), where nn =
card # and
cc = channel # (omit leading zeroes in nn)
– For Channel 91 HI, subtract combined value of R23 + R29
– For Channel 92 HI, subtract combined value of R23 + R26
Ch 08 - 15 and 91 - 92
LO Measurements
1. Make Hardware Connections
– Turn mainframe power OFF
– Connect DMM leads as shown in Figure 2-7
– Turn mainframe power ON
Figure 2-6. Ch 08-15 and 91-92 HI Measurements Connections
Chapter 2 Verification Tests 27