Service manual

27
AC mains voltage is present on exposed pins on the top edge of the mainframe GPIB Board and each
module whenever the unit is turned on.
a. Carefully lay the Control Board and Power Board on an insulated work surface directly next to the mainframe.
b. Using extender cables, connect the Control Board to the GPIB Board in the mainframe.
c. Make the following connections for signature analysis.
1. Connect jumper RTP301 in the SA position (SA_EN) across pins 1 and 2 of the secondary test header TP301 as
shown in Figure 3-2c.
2. Set up and connect the signature analyzer ' s CLOCK, START, STOP, and GND inputs as follows:
Signature Analyzer Edge
Input Setting TP201 Connection
d. Turn on the signature analyzer and use the probe to take signatures at the applicable test points given in the signature
analysis tables.
e. Upon completion of the signature analysis tests, disconnect the signature analyzer leads and return jumper RTP301 to
its normal operating position between TP301-3 and TP301-4.