Tektronix 1720

1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
J5
L4
1MH
C62
C63
L3
4.7UH
CR10
C36
560UF
C38
560UF
W3
0 OHM
W4
0 OHM
+15A
+15V
+40V
-15A
-15V
C30
560UF
C29
560UF
L2
4.7UH
R67
10.0
CR11
CR12
10
8
14
13
12
11
9
2
1
5
6
7
T3
CR14
RV1
CR18
C44
.47UF
R93
150K
R94
150K
R91
100K
R92
100K
R102
8
DS4
C54
330UF
CR24 CR21
CR22CR23
C56
.022UF
F1
2A
C57
.068UF
R89
5
J10
J6
5
6
7
U3B
LM393
R97
2.00K
+5VC
C47
1.0 UF
CR25
CR19
COMP
1
VFB
2
ISEN
3
RT/CT
4
REF
8
VCC
7
OUT
6
GND
5
U5
UC3842
+5VC
C49
.1UF
C42
560UF
C50
.47UF
CR27
C53
100PF
CR17
C55
C32
560UF
L1
4.7UH
C31
560UF
C35
560UF
+5V
CR13
W1
0 OHM
W2
0 OHM
+40VA
+5D
+5V
C33
10UF
C37
560UF
+100V
+5V
+15V
+40V
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
J4
ZAXIS
FOCUS
J4-1
+5V
Q11
R13
100
R14
10.0
VR3
R86
.51
R90
2.4K
Q9
CR20
R87
22.1
R82
4.99K
R101
49.9
R81
178
R88
2.00K
+5VC
R79
49.9K
C51
.01UF
C58
200PF
C
L
1
1
CX
6
RX
7
B
10
A
9
Q
12
Q
5
U4B
74HC221A
C59
.1UF
R96
49.9K
R75
4.99K
+5VC
R78
3.74K
R95
4.53K
3
2
1
8
4
U3A
LM393
R74
4.99K
C43
.47UF
C52
.01UF
+5VC +5VC
C45
.47UF
C48
200PF
R80
2.00K
+5VC
+5VC
+5VC
R77
100
C
L
3
VCC
16
GND
8
CX
14
RX
15
B
2
A
1
Q
4
Q
13
U4A
74HC221A
C41
.47UF
C39
.1UF
+5VC
C61
470PF
CR15
Q8
CR29
1
2
4
3
T2
R62
100
C40
4700PF
R98
10.00K
+40V
VR1
VR4
CR26
R71
221K
R68
178
+5V
R69
10.00K
R70
10.00K
R99
100K
+5V
R85
100K
-15V
1
2
1
2
J2
TP1
R72
10.0
R73
10.0
TP2
+5VC
+5VC
Q7
CR16
C46
.01UF
+5VC
R76
3.74K
R84
18.7K
R83
10.00K
C60
.1UF
CAUTION: ALL CIRCUITRY TO THE
MOUNTING
LINE RECTIFIER
AND FILTER
LEFT OF THE ISOLATION
BOUNDARY IS AT POWER LINE
POTENTIAL AND REQUIRES
AN ISOLATION TRANSFORMER
TO SERVICE.
BOUNDARY
ISOLATION
CLAMP
NOT INSTALLED
OUTPUT FILTERS
1700F10
(DC OPER.)
UPGRADE
ONLY
USED WITH
90-250V
REAR
PANEL
OUTPUT UV
SHUTDOWN
PULSE
WIDTH
MODULATOR
SWITCHER
MOSFET SNUBBER
NOT INSTALLED
NC
J4
CONNECTS
A3
MAIN
BOARD
TO J153
A3
<6>
A4
A4
D5
<9>
<9>
<9>
ERROR
5.1V
H
BOUNDARY
ISOLATION
Q9
NC
NC
FEEDBACK
TRANSFORMER
DRIVER
NC
NC
NC
GDS
AMPLIFIER
10V +5V ADJUST
POWER
FRONT
PANEL
(OPEN = ON)
S1
LINE SIDE COMMON
SECONDARY GROUND
(CHASSIS GROUND)
PEAK
DETECTOR
1720/1721 VECTORSCOPE
LOW VOLTS POWER SUPPLY <8>
PART OF A1 POWER SUPPLY
NOTE: SEE PARTS LIST FOR EARLIER VALUES
AND SERIAL NUMBER RANGES.