Fluke 93 Service Manual page 152

7-26
CORRECTIVE MAINTENANCE
1^
2
1
SRG5
T
1
>
Cl
>
C2/-^
II
Ci
10
20
30
1 1
12
3D
T3
1
4
5
4
5
6
7 HCT
!65
ST6625
Figure
7.
S Keyboard
decoders
D160
1/02/02f04/0$
D3
07
5T6622
9T11
U
Table
7.6
Signals
measured
on keyboard decoders
D
1601/02/03/04/06.
Logic
0*0V
Logic
1=+5V
Comp Name
Scope
Freq.
Data
Description
CIrc/IC
H/L/A
D1601/D1 602/D1603/D1
604/DI
606
1
FRONT-LATCh/GI
Unstable 34 Hz
A FRONT
LATCH
signal
2
FRONT-CLOCK/>1
Unstable 775 Hz
A
FRONT CLOCK
signal
3
CURSOR2-U...
D1601
0
H
CURS0R2-Left
key
B-MOVE-UP/... D1602
0
H
Channel
B-MOVE-UP
key
CURSOR1-R/... D1603
0
H
CURSOR1
-Right
key
TlME-ns/...
D1604
0
H
TIME-ns
key
LCD/...
D1606
0
H
Liquid Crystal
Display
key
4 CURSOR1-L/...
0
H CURSOR1
-Left
key
TlME-s/...
0
H
TlME-s
key
SOFT-5/...
0
H
Soft
key
-5
A-MOVE-UPy...
0
H
Channei
A-MOVE-UP
key
SPECIAL/....
0
H
SPECIAL FUNCTion
key
5
SOFT-4/...
0
H
Soft
key
^4
A-mV/...
0
H
Channel
A-mV
key
SOFT-3/...
0
H
Soft
key -3
B-
AC/DC/...
0
H
Channel
6-
AC/DC/GROUND
key
HOLD/RUN/...
0
H HOLD/RUN