Tektronix 2A60 Instrument Reference Book page 63

INSTR UC TIO NS ( cont)
E. TO MODIFY TYPE 3Bl
IMPORTANT: Select the proper steps below, plus the portion of Fig. 7 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 E-1-a) through the 'bottom' hole in the
new post and resolder to the TIME/DIV switch.
( ) d) Drill a 5/32in. hole at the rear of the chassis, as shown in Fig. 7.
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 SOURCE switch (lug connected
to EXT TRIG binding post). Solder the shield to the middle grounded lug of the
switch.
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 SOURCE switch (lug connected to
EXT TRIG binding post). Solder the shield
to
the grounded lug of the switch.
THIS COMPLETES THE INSTALLATION FOR THE TYPE 3B1.
( ) Fasten the insert page in your Instruction Manual.
040-0406..,00
Page 15 of 19