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Model 654A
el
65~
\
Section VII
NO
7·1.
7-2.
CIRCUIT
INTRODUCTION.
This section
contains circuit
diagrams to
aid
in the
operation and maintenance of the Model 654A
.
Figure 7-1
is a functional circuit diagram which shows the overall
relationship between the basic circuits of the instrument.
Figures 7-2 through 7-5 contain the detailed schematic
diagrams as well
as component
location drawings of
each
JACK
XA2
IS
C
HASSIS OR
REFERENCE DESIGNATIONS
ASSEMBL
Y
ASSEMBLY
REFERENCE
ASSEMBLY
PART NUMBER
DESIGNATiON
NAME
(INC
L
uDES A2AI
SuBASSEMB
L
Y)
,---J'----,
~
~
A2
POWER SUPPLY
(OOXX
X
- 66501)
MOUNTED
ON
ANOTHER
ASSEMBL
Y
~
PLuG PI'S M
OUNTE
D
ON
ASSEMBLY
DR
IS
PART
,JI'?/OF
THE
A$SE.·.4BL
Y
BO
ARO
(C OMPL
E
TE
DESIG
NA
TOR
PI
~
~2
.
I
R3
TEST
VOLTAG
E
~
PI
IS
NO
T MOuNTED
ON
A2
ASSEMBLY
+2.92V
(COM
P
L
E
TE
D ESIG NATOR
1$
Pf)
~COMPLErE
DESIGNATOR
IS
A2
R4
R4
~
·
1
~
E-(:"-~'-_-'-<.
(
4
--<
~
~
WIRE
COLOR
:
COLOR
COOE?sTHE
SA
ME
AS THE RESISTOR
COLOR
CODf.
F
IRS
T
NUM BER
INDICATES
BA
S
E
COLOR,
SECO
NO
I~NUMBER
INDICATES
PIN
O
F
XA2
AND
P
I
r
18
I
~
EYELET
OR
STAND-
I
OFF
TERM
INA
L, MA
Y
OR
~~~8~~lk~D5w'6~~~lils
Wi~iR
NS:~~dw:%O
I
MA
Y
NjOT
~UMB;;;O
STRIP.
(~DENOTE
S
WH
T/ REO/YEL
WI
RE
)
I
~
e
SECTION VII
DIAGRAMS
printed circuit board and th
e
rotary
switches.
7-3. General schematic notes, which apply to all the
schematic diagrams, are listed
on
Page 7-2
.
7-4
.
An
explanation of
terms and symbols used on the
schematic
diagrams is given below.
IS
A
2PI)
SUBASSEMBLY OF A2
~(CO
M PLE
T£
DESIG
NA
TOR
IS
A
2
AI)
AI
[PH OT O-:CHOPPER
osc-i
I
I
I
I
R2
M
A
LE STANDO; ;
PIN
PIN
CON NECTOR
CONNECTOR
ON
MA
Y OR
MA
Y
A
WHT/
RED
WIRE
I
I
Nor
BE
NUMBERED
f.'f1JIl-~
COMPLETE
I
I
DESIGNATOR
~fI.--'
IS
A2AIR
I
I
I
CL
DEN
O
TE
5
SIGNAL
CO
NN
E
C
TlON
)r--_P----7'
LXA2
e
2
I
DENOTES
stEMATIC
ON
WHI
C
H
CONN£CTl
ON
1$
MADE
)1
~
~FEMALE
PARTIAL REFERENCE DESIGNATIONS ARE SH OWN: PREFIX WITH ASSEMBLY
OR
SUBASSEMBLY
DESIGNATION(S) OR BOTH FOR COMPLETE DESIGNATION
s ro
-8
-
21
9
2
7-1
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