Tektronix 1740A Series Service Manual page 299

+8V SUPPLY
R290
100
R289
100
R284
100
U78
7808ACT
1 3
+11V IN OUT
G
3
C136
.1UF 2
+40V
1 2
3
VR1
6.2V
2
3
VR2 VPP1 SUPPLY
6.2V
2
3
U20
VR3
R45 R56
LP2951
6.2V
39.2 39.2
2 8 1
+VIN VOUT
NC 5 2 NC
ERROR SEN
R54
C42
27.4K .1UF 3 6 NC
SHUTDN 5V
4 7
FB
GND
BEZEL CONTROLS
HORIZ1
VREF
R6
10K
1 2 4
8 7
HORIZ POS
9 10
3 5 6
HORIZ2
VERTICAL1
VREF
R10
10K
1 2 4
8 7
VERT POS
9 10
3 5 6
VERTICAL2
C1
<9>
CRTLEFT1
VREF
R9
10K
1 2 4
H4
CRT LEFT 8 7
<6>
9 10
3 5 6
CRTLEFT2
CRTMID1
VREF
R8
10K
1 2 4
CRT MIDDLE 8 7
9 10
3 5 6
CRTMID2
CRTRIGHT1
VREF
R7
10K
1 2 4
CRT RIGHT 8 7
<7>
9 10 C3
<6>
+5V 3 5 6 H4
<9>
CRTRIGHT2 C1
R19
10.0
C2
.1UF
VREF
C1
10UF
1740A/1750A/1760--SERIES
---8V SUPPLY
2 1
CR6
C74
1 C75
.1UF
10UF
3
G
2 3
--- 11V IN OUT
U53
7908ACT
R145
100
+8V
R146
C139
10UF 100
CR9
R147
100
J4
NORMAL 2--- 3
P4
J4
1 2 3 H3
+12V <6>
VPP1
C39
R46
10UF
20.0K
R47
2.21K
U4
TLC540
BMOSI 17 16 MISO
DIN DOUT
HORIZ1 1
AN0
HORIZ2 2
AN1
VERTICAL1 3
AN2
VERTICAL2 4
AN3
5
AN4
6
AN5
7
AN6
NC 8
AN7
9
AN8
11
AN9
12
AN10
A/D_CLK 19
S CLK
BSCK
18
I/O CLK
+5V
15
/ADCS1 CS
C8
.1UF
13 20
REF--- VCC
VREF 14 10
REF+ GND
U3
TLC540
BMOSI 17 16 MISO
BMOSI DIN DOUT
CRTLEFT1 1
AN0
CRTLEFT2 2
AN1
CRTMID1 3
AN2
CRTMID2
4
AN3
CRTRIGHT1 5
AN4
CRTRIGHT2 6
AN5
7
AN6
8
AN7
NC 9
AN8
11
AN9
12
AN10
A/D_CLK 19
A/D_CLK S CLK
BSCK 18
BSCK I/O CLK
15 +5V
/ADCS2 CS
C7
.1UF
13 20
REF--- VCC
VREF 14 10
REF+ GND
--- 8V
+5V
C107
.1UF
G5
<9>
GRAT_LITES
C5
.1UF
U1D
C4 R14
MC34004
.1UF 10.0K
13
14
12
R15
100K R17
22.1K
R18
22.1K
F4
<6>
MISO
BLANKING LOGIC
+8V
+5V
1 1
C3
2 3
<10>
H5
2 3
<5>
PIX_INT EXT_BLNK
U49A
DG444 G3
5 1 4
<7>
X_BLNK_EN
G1
<7>
PX_INT_SEL
--- 8V
R76
20.0K
RO_INTENS0
C4
R75
10.0K <7>
C3
RO_INTENS1
<8>
H4
R77
5.62K <10>
RO_INTENS2
U49B
DG444
R74
G5
562
<9> 7 6
RO_INT
G1
8
<7>
RO_INT_SEL
U49C
DG444
G5
<9> 10 11
VEC_INT
G1
9
<7>
V_INT_SEL
U49D
DG444
G5
<9> 15 14
WFM_INT
1
G1
6
<7>
W_INT_SEL
+11V
R1 R2 R3
39.2 39.2 39.2 39.2
GRATICULE
LIGHTS
C3
10UF
--- 11V
+11V
4
U1A
R11
MC34004
3 3.32K
1
Q2
2
R12
1
1.00K
1
--- 11V
--- 11V
--- 11V
R16
22.1K
U1B
U1C MC34004
R13
MC34004
5
3.32K
9 7
Q1
8 6
10
R5
1.00K
--- 11V
--- 11V
H2
<9> R73
FOCUS
10.0K
H1
<3>
GBR_INT
R125
CR3
H4
15.0K
2
<7>
/LS_STROBE
3
NC 1
+5V
R118
U29C
R71 10.0K
74HCT125
392
9 8
CR4 B1
/FPAN_CS
1 2 +8V <9>
0
3
/FPAN_EN
1
MISO
R126
BMOSI
33.2K
BSCK
Q7
POWER_ON
CR5
/BLANK
2 A4
3 R119 <6>
/RESET
1 825
/OPT_BLANK
TRACE
ROTATION
+11V
8
U5A
G5
MC33178
<9> 3
TRACE_ROT
1
2 3
CR1
4
2 1
--- 11V
+11V
--- 11V
U5B
MC33178
5
7
6
PART OF A3 MAIN BOARD
Z---AXIS & CONTROL <11>
R4
SKT4 DS2
1
2
SKT3 DS3
1
2
FRONT
PANEL
GRATICULE
SKT2 DS4 LIGHTS
1
2
SKT1 DS5
1
2
J6
NC 1
1
FOCUS 2
2
Z--- AXIS 3
3
J6
POWER_ON 4 CONNECTS
4
TO J4
5
+100V 5
<21>
6
+40V 6
7 A1
+11V 7
POWER
8 SUPPLY
+5V 8
9
9
10
--- 11V 10
J1
1
1A
2
1B
3
2A
J1
CONNECTS
4
2B
TO J2
5
3A
<12>
6
3B
A2
7
4A
FRONT
NC PANEL
8
4B
9
+5V 5A
10
5B
J3
CONNECTS
J3
TO P320
ON CRT
2
1
H1
<22>
R20
1.50K
R22
39.2