C-4
Page 5- 1 7 , Paragraph 5-5 1 :
Change troubleshooting information Steps
®
through
CD
to the following:
Check the power supply connections to external
circuits, and check the resistors in series with the
connections
(A2
Pins
1 , 2, 6
and
7 ; A3
Pin
4
and
7;
Al R 1 7 , Al R24, A I R26
and
A
l
R28),
A
procedure for checklng the oscillator circuit is
given in Paragraph
5·53.
False if either or both voltages arc not correct. If
the
1-
30
V
was corrcct in Step
4,
check only A l
Pin
7.
a. If only the
.
25
V
supply is inoperative,
proceed to branch
9.
h.
The
.
25
V
supply is referenced to the
+
30
V.
Uft one side of
Al R 1 3
to isolate the
supplies from each other; if the
+
30
V
supply
now operates normally, proceed to Step
9 ;
if it
docs not, remove external circuits by disconnec
ting
A2
Pins
1
and
6, A3
Pin
7
and
Al R 1 7.
If the
supply now operates, then the trouble is in the
external circuits. If the supply still does not
operate, check
Q l , AIQ2, AIQ3 , A l e R l
and
A I CR2.
Isolate the ·
25
V
supply from external circuits by
disconnecting
A2
Pins
2
and
7, A3
Pin
4
and
Al R24, AI R26
and
A
l
R28. If
the supply now
operates, then the trouble is in the external
circuits; if the supply does not operate, check
Q2,
A I Q5, AI Q6, AIQ7, AICR.l
and
AI CR4.
Page 5-21 /5-22, Figure 5-1 1 :
Change Step 7 of the troubleshooting tree to 43
V
ac at Al
pin 5 , 40
V
ac at Al pin 7,
Page 6-3, Figure 6·1 :
Change the Regulated Power Supply block diagram as in
Figure C·3.
TED POWER SUPPL
Y
AI P I N 5
4,;;
11:::-
,,'
,
, ,
,
+ SUPPLY
- SUPPLY
-25VOC
40VAC
Figure C-3, Power Supply Block Diagram,