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Table
6-2.
Power
Supplies and Generator
Loop
(Continued)
r
Indication:
Fuse
clown.
no
power
indication
or
no
outputs
Check
Corrective
Procedure
4
Check
indicator
lamp
DS1 and
VR2.
wiring
E34
and
E33
5.
Check
C4
()
for
+
i5Vdc
a
Vfli.
b
Excessive
loading;
use
board lumpers
to
isolate
cause
6.
Check
C5(-)
tor
-15
Vdc
a
02.
b
U2,
01.
c.
Excessive
loading;
use
board jumpers
to isolate
cause
7.
Check
U7
pm
14
tor
5
Vdc
and
U7
pin 13
tor
-
5
Vdc
a
04. 03.
U2.
b
Excossive
loading,
use
board jumpers
to
isolate
cause
8
Check U4
pm
6
tor
a
dc
shill
trom approximately
10V
to
15V as
me
troquency
dial
is
rotated
trom 4
0
to
.004
Check
U6
pm
8
lor
a
dc
shitt
trom
-
lOVto
-
15V as
the
treguencyd*ai
is
rotated
trom
4
0
to
004,
Go
to
tobio
6-7.
9
Check anode
CR6
tor
approximately
3 5
Vdc
Goto
table
6-10
10.
If
emitter
Oi
1
has
a 4
kHz.
1
1
25V
triangle,
go
to
table 6-3
1 1
.
Check
tor
me
same
voltage
at the
gate
of
09
as
at the emitter
ot
Oi
1
within saturation
limits ot
the amplifier
09-011
and
associated
circuitry.
12
It
the
voltage
at
the emitter ot
Oil
is
t
+
1
25V,
check cathode
CR10
lor
approximately
-
2.5V
It
the voltage
at
the emitter ot
Oi
1 1s
s -
1
25V.
check cathode
CRiO
for
approximately
2 5V.
U7.
07
and
associated
circuitry.
13.
Check
U5
Table
6-3.
Output
Circuits
Indication:
Function outputs missing
otcoped
when
TTL sync
output
OK
Problem
with
triangle
waveform
Check
Corrective
Procedure
1
.
Set controls
to
initial
positions
(refer
to
paragraph
6.4).
Check
for
normal
operation.
2.
Check
emitter
Qi
1
for
a 4 kHz.
±
1
25V
triangle
Go
to
table 6-2.
3.
Select
triangle function, rotate
AMPLITUDE
ccw.
and check
U13
pm
10
tor
a
*
1
25V
triangle
a.
R114
R1
18 adjustments.
b.
U13.
c
SW13.
6-3
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