Tektronix 2246 1Y, Service Manual

Page: 382 / 433

B
8
DATA
BUS
FROM
/S>2K LED ANODE AND 1
v 1 SWITCH REGISTER I
LED & SWITCH COLUMN DRIVERS]
SD1 8
SD2 14
SD3 7
SD4 17
VD5 4
U 2 5 2 3
74HCT374
11
EN
->C1
S
620
+5V
- Q
g
!2 5 0 1
J 2 5 0 1 -f6
LED ANODE CLK
FROM
U 2501-27
<§>
,D0 13
U 2 5 2 4
74HCT374
ID > V
J01 8
^D2 14
J33 7
JD4 17
vD5 4
^D6 18
vD7 3
11
J L,
EN
>C1
> R2529
U 2 5 2 5
74S240
> 2V
>
IV
> 2V
> IV
> 2V
> IV
> 2V
>
IV
L
EN1
EN2
I
J2501
C2543
J ^ .
* aa 'I' .0047 fg
—vw-i----
LED CATH CLK
FROM
U 2501-25
<£>
7D
LED
c a t h o d e
:
* REGISTER S I
DRIVER
CIRCUIT
NUMBER
+5V GND
U2001 16
8
U2002 16 8
U2523 20 10
U2524 20 10
U2525 20"
10
i /
W
DS2042
|READY
(TRIGGER)
BS1
0S2043
('TRIGGER')
{ CPLG )
('TRIGGER'!
{
CPLG
)
® '
DS2045
I
h f r e j
I
i
('TRIGGER'!
\
CPLG
)
DS2046
I
l f r e j
/'TRIGGER')
i CPLG
)
W
DS2047 y
LVi
A16
PROCESSOR BOARO I
# - 5 V Q . i v |
A/B
SELECT < r
DS2034
VERT
('TRIGGER'!
{
SOURCE
DS2035
I™ ]]© '
('TRIGGER'!
{ SOURCE )
DSa036 y
1E3® '
DS2037
I l(t)y
I I© -*
0Sa039 y
('TRIGGER'!
{ SLOPE )
A AUTO
LEVEL/
B AUTO
LEVEL
< r
A AUTO/
B RUNS
AFTER
® '
/'TRIGGER'!
^ MODE
)
® '
('VERTICAL
MODE )
A TV L IN E /
B TV LINE
FROM
A SOURCE
('TRIGGER'!
{ MODE )
/'TRIGGER'!
I MODE )
d
®
Q®'
(
CH 4
\V 0L T S /D ivj
N
nasoi
DS2032 y
|#-5V 0-ivl@^
CHOP
Q
ALT
VERTICAL
MODE )
® '
&
# AC
GND
(
CH 1
)
^COUPLINGj
® '
#DC
GND
(
CH 1
)
U
o u p l in g
J
® '
® '
|
u n c a l
|
(VERTICAL)
<$>'
(VERTICAL)
® '
# A C
GND
® '
&DC
GNO
DS2001 y
[E
ll
]® '
('
ve r t i c a l
{ MODE )
DSa002 y
I ADD l@'
('VERTICAL
{
MODE
)
DSa003
E
ell
1©/
('
v e r t ic a l
{
MODE
)
DS2004
I <=H 3 |( | ) y
( VERTICAL^
DS2005
m
'HORIZON-^
J A L MODEj
® '
DS2006
0
/'HORIZON-']
U
a l
MODEj
<T
y DSa007 y
® ' H
® '
DS200B y
0 ® '
$CR2001
S2048
ESC
VOLTS/DIV (Cl
S2043
E H ™
2246 1Y AND
___
a
___
2246 MOD A *>
62-13
BS7
1
S2033
[FRONT JANEL^.LEDS] r
|LAST M E A S ‘ Ml
PARTIAL
A 1 4
SWITCH BOARO |
i
S2041
IP^Hfcn!
iCH2 INVERT| |
S2038 ,
r ^ i ( H en
S2037
» Es.