Tektronix 1720

VARIABLE
DEMOD
OUT
X Y
X Y
X
Y
F
SC
<6>
ERROR
<3>
SCALE
<3>
<3>
B-Y (U)
DEMODULATOR
FOCUS
ROTATE
PHASE
INTENS
LOCK
DETECTOR
&
BANDWIDTH
SWITCH
ÉÉÉ
ÉÉÉ
ÉÉÉ
FOCUS
CONTROL
R–Y
<1>
<4>
<4>
-X INPUT
+X HI GAIN
+X INPUT
-Y INPUT
+Y HI GAIN
+Y INPUT
X IN
Y IN
TXD
EXT STROBE IN
RXD
MICROPROCESSOR
<5>
<2>
<2>
<2>
<2>
LOW PASS
FILTER
<2>
LOW PASS
FILTER
QUAD
PHASE
<2>
<2>
<2>
<2>
<2>
<2>
ALTERNATE
LINE
SWITCHING
LUM
SYNC
SEPARATOR
BACK PORCH
SAMPLE
BOWES
OSCILLATOR
<2><2>
GAIN CELL
SYNC
TIP
CLAMP
<3>
<1>
LOW PASS
FILTER
HORIZONTAL
CENTER DOT
POSITION CLAMP
<3>
B–Y
(U)
<3>
<3>
<3>
QUAD
PHASE
V–AXIS
SWITCHER
VERTICAL
CENTER DOT
POSITION CLAMP
LOW PASS
FILTER
<3>
R-Y (V)
DEMODULATOR
PAL PHASE
COMPARATOR
<3>
<3>
CAL
UNLOCK
PHASE
SHIFTER
<2>
<2>
<2>
<2>
<2>
<2>
BURST
CLAMP
VOLTAGE
CONTROLLED
OSCILLATOR
LOOP
QUAD
<2>
<2>
mP BLANK
CRT
BLANKING
INTENSITY
CONTROL
<4> <6>
<8>
<6>
<4>
CENTER
DOT
COMPARATOR
<8>
<8>
HIGH
VOLTAGE
SUPPLY
<4>
<4>
<8>
<4>
<4>
<6>
X Y INPUT
CH - A
CH - B
QUAD PHASE
DETECTOR
LOOP PHASE
DETECTOR
VERT
R–Y
(V)
<8>
HORIZ
GRATICULE
ILLUMINATION
EXT REF
AUXILIARY
CONTROL
CONTROL LINE
SIGNAL LINE
KEY
SCHEMATIC DIAGRAM
NUMBER <n>
1720 / 1721 VECTORSCOPE
GAIN
CAL
INT/EXT
<1>
<1>
<4>
<4>
<5>
<2>
VAR
75%
100%
EHT
(4X)
TRACE
ROTATION
<1>
C B
C A
NOVRAM
<5>
LINE
SELECT
CHROMA
FRONT PANEL
SCREWDRIV-
ER ADJ.
FRONT PANEL KNOB
<2>
<3>
<1>
<1>
<1>
<2>
<3>