Tektronix 7613 - sm_Page_046.tif

/ Output
Input
f
- g
g/e
é A
a Trigger Output Signal
4 14 12, 13
Lo LO [Left trigger signal
HI LO | Right trigger signal
LO Hi | Both (added algebraically)
Fig. 3-15. input/output table for Trigger Channel Switch stage.
VERTICAL INTERFACE
The Vertical Interface circuit selects the vertical deflec-
tion signal from the output of the left vertical and/or the
right vertical plug-in unit. Fig. 3-16 shows a detailed block
Circuit Description—-7613/R7613 Service
diagram of the Vertical Interface circuit. A schematic of
this circuit is shown on diagram 3 at the rear of this
manual.
Vertical Channel Switch
The Vertical Channel Switch stage determines which
input signal provides the vertical signal to the Delay-Line
Driver stage as controlled by the Mainframe Vertical Mode
Command from the Logic circuit. Resistors R200-R202 and
R204-R206 establish the input resistance of this stage and
provide a load for the left and right vertical units, Resistors
R209-R211-R212 and R216-R218-R219 establish the oper-
ating levels for this stage. R209-R212 and R216-R219 set
the current gain for each channel. C208-R208 and
G215-R215 provide frequency compensation.
This stage is made up primarily of integrated circuit
U214, which is the same type as used for the Trigger
Channel Switch. An input/output table for U214 is shown
in Fig. 3-17. U214 provides a high impedance differential
input for the signal from the left vertical unit at pins 2 and
15, and the signal from the right vertical unit at pins 7 and
10. The output signal at pins 12 and 13 is a differentia!
signal which is connected to the Delay-Line Driver stage
through R222-R224, The sum of the DC output currents at
X/Y Shutdown
Readout
Mainframe
Vertical Mode Command
from Logic circuit
ADD Mode from VERT
Lenny
MODE switch
L '
Left Vertical Signal ~~
from Left Vertical unit —_—_——> .
Vertical
Channet
Right Vertical Signal =£————»4 Switch U214
from Right Vertical unit —————4
Q238
Vertical
Signal to
Vertical
Amplifier
Delay Line
{~150 ns)
DL400
Auxiliary
Y Axis
input Amplifier
Q225, 0236
Auxiliary Y-Axis Input
from Horizontal Plug-In
Fig. 3-16. Vertical Interface detailed block diagram.
REV. JAN 1974
3-19
7613