Tektronix 2A60 Instrument Reference Book page 65

INSTRUCTIONS (cont)
F. TO MODIFY TYPE 3B3:
IMPORTANT: Select the proper steps below, plus the portion of Fig. 8 which
applies, to connect either the Delayed EXT TRIG or the Normal
EXT TRIG binding post to the rear panel.
1. Delayed or Normal EXT TRIG:
( ) a) Unsolder, from the TIME/DIV switch, the coax cable which passes through the
support post near Q23.
( ) b) Replace the support post with a 4-hole post (rod) from the kit.
( ) c) Dress the coax cable (unsoldered in step F-1-a) through the 'bottom' hole in the
new post and resolder to the TilvE /DIV switch.
( ) d) Drill a 5-32in. hole at the rear of the chassis, as shown in Fig. 8.
CAUTION: Look out for the wiring cable on the other side of the chassis.
( ) e) In this hole, mount a 2-hole support post (rod) from the kit. Use a 6-32 x 5/16
PHS screw from the kit.
2. Delayed EXT TRIG:
( ) a) Dress the coax cable (from J-1) through the 'top' holes in both the 2-hole and
the 4-hole posts.
( ) b) Solder the coax center conductor to the Delayed EXT TRIG binding post and
the shield to the grounded SOURCE switch terminal.
3. Normal EXT TRIG:
( ) a) Dress the coax cable (from J-2) through the 'bottom' hole in the 2-hole post and
the second hole from the 'top' in the 4-hole post.
( ) b) Solder the coax center conductor to the Normal EXT TRIG binding post and the
shield to the ground post.
THIS COMPLETES THE INSTALLATION FOR THE TYPE 3B3.
( ) Fasten the insert page in your Instruction Manual.
040-0406-00
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