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Tlble 6 - 2. Power Supplle. end G .n
Indica tion: Fuse blown, no power indication
4.
Check indicator
lamp.
Check C4 ( + ) for
5.
+
6 .
Check C 5 ( - ) f o r - 1 5
Check U 7 p i n 1 4 for + 5
7 .
8 .
Check U4
6 for
p i n
a
f requency dial
1 0Vto
is
rotated
from -
- 1 5V as
9.
Check anode CR 1 26
I f
has a 4 kHz.
1 0.
emi tte r 0 1 1
for
Check
the
s a m e
1 1 .
within satu ration
l i m i t s
1
2.
I f the voltage at the emitte r of 01 1 is
for
-
approxi mately
cathode CA 1 0
check
1 3
.
Check U
5.
Indication: Func tion outputs missing or clippe d when TTL sync output OK. Problem with triangle wa
,
.
S e t
cont rols to
in iti a l
2.
emitte r 01 for
Check
Select triangle f u nc tion . rotate
1
.25V
3 .
for a ±
tri
angle.
Scans by Artekmedia
Check
1 5
Vdc .
Vdc .
p i n 1 3 lor - 5 Vdc .
Vdc a nd U 7
dc s hift f rom
approx i m a t e ly
from 4 . 0
.004.
Check U 6 pin 8 for
to
is
the
f requency-d i a l
rota ted
3.5 Vdc .
l o r approx i ma te l y +
±
1 .25V triangle.
at the gate of 09
voltage
of the a mpl ifier.
1
.25V,
2: +
I f
2. 5V.
e mitte r of 0 1 1 is
the
vol tage at the
2. 5V.
fo r app rox i mately +
Table 8-3. Output C i rcuits
Check
positions (refer to
paragraph
4 kHz.
1
.25V Iria
ngle.
±
a
AM PLITU D E
ccw,
2011
=>
(Continued)
tor Loo p
. ...
outputs.
or no
1 0V t o
1 5V a s
+
+
t he
shift
to
a
dc
f rom 4.0
.004
.
go to
6- 3
.
table
at
t he emi tte r of a l l .
a s
check
CR l 0
cathode
- 1
.25V.
�
6.
4).
chec
U 1 3
k
and
p i n 1 0
Correctly. Procedure
DS l and VR2 . w i ring E 34
and
E33.
VRl .
a.
b.
E x cessive
jumpers
l oad i n g ;
board
isolate
to
ca
use.
a
.
02.
b.
U 2Q l
.
jumpe rs
c .
E x c e s s i v e
l oad i n g ;
boa rd
t o isolate
cause.
a. 04, 03. U2
.
b. Exces sive
loadi n g ;
boa rd
isolate
j u m pe rs to
cause .
Go
tab le 6-7 .
to
G o
t o ta b l e 6- 1
0.
0 1 1
and associated
09
•
ci
rcu i try
.
assoc i a t ed
U 7 .
0 7
a n d
c i rcuitry.
veform.
Corrective Procedure
Check for
normal
ope ra tion .
to
Go
6-2.
table
R 1 1 4 R 1 1 8
a .
adj
ustments.
U 1 3 .
b.
SW1 3.
c .
use
us e
use
6-3
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