6·1.
INTRODUCTION.
SECTION VI
CIRCUIT DIAGRAMS
6-2. This section contains the circuit diagrams necessary for
operation and maintenance of the Model 652A. Figure 6·1
is
a block diagram which shows the overall relationship be·
tween the basic circuits of the inmurnent. Figures 6·2
through 64 contain the detailed schematic diagrams as well as
component location drawings of each printed circuit board and
the two rotary switches.
6·3.
An
explanation of terms and symbols used as refer
ence designators is given below.
R E F E R E N C E DESIGNATIONS
ASSEMBLY
ASSEMBLY
REFERENCE
ASSEMBLY
PART NUMBER
DESIGNATION
NAME (INCLUDES A2AI SUBASSEMBLY)
- - --- - -
1
JACK XA2 IS MOUNTED ON
POWER SUPPLY (OQXXX- 66501)
CHASSIS OR ANOTHER ASSEMBLY
PLUG PI /S MOUNTED ON ASSEMBLY OR IS PART
YV
OF THE ASSEMBLY BOARD (COMPLETE DESIGNATOR IS A2P/)
I
DENOTES SIGNAL
PI IS NOT MOUNTED
I
R3
TEST VOLTAGE�
01
f��':lL:fi�'1�T�NATOR IS PI)
,
I
+2�92V
, I
..Y'V'
COMPLETE DESIGNATOR IS A2R4
I
: I
R4
DENOTES
-----*�('i�'-'---'''(
IS A2AI}
ON WHICH CONNECTION
--1( �
INDICATES
I 1$
MADE
PIN OF XA2 AND PI
fP
HOTO-CHOPPER OSC-
!
I
__
:
.
I
I
�
I �
II
FRF�
R2
II
MALE STAND
,ff;
�
F£MALE PIN
'II/RE COLOR: COLOR CODE IS THE SAME
PIN CONNECTOR
CONN,-CTOR ON·
AS
THE RESISTOR COLOR CODE. FIRST
EYELET OR STAND-
MAY OR MAY
A WHT/RED WIRE
NUMBER INDICATES BASE COLOR SECOND
I
OFF TERMINAL, MAY OR
NOT BE NUMBERED
NUM
BE:R INDENT/FIES WIDER STRIP. AND
I
MAY NOT 8£ NUMBERED
I
COMPLETE
I
THE THIRD INDICATES THE NARROWER
flY"
DESIGNATOR
STRIP. (
�
DENOTES WHT/RED/YEL WIREJ
8
I
IS A2AIRI
I
PARTIAL R EFERENCE DESIGNATIONS ARE SHOWN: PREFIX WITH ASSEMBLY OR SUBASSEMBLY
DESIGNATION(S) OR BOTH FOR COMPLETE DESIGNATION
Nom
1 .
PARTIAL REFERENCE DESIGNATIONS ARE SHOWN.
PREFIX WITH ASSEMBLY
OR SUBASSEMBLY DESIGNATION(S) OR BOTH FOR COMPLETE DESIGNATION.
9.
*
DENOTES POWER LINE GROUND.
2.
COMPONENT VALUES ARE SHOWN AS FOLLOWS UNLESS OTHERWISE NOTED.
3.
4.
5.
RESISTANCE IN OHMS
CAPACITANCE IN MICROFARADS
----
DENOTES ASSEMBLY.
DENOTES MAIN SIGNAL PATH.
DENOTES FEEDBACK PATH.
6.
c:=J
DENOTES FRONT PANEL MARKING.
7.
�
DENOTES SCREWDRIVER ADJUST.
S.
0
DENOTES FRONT PANE L CONTROL.
10.
....
11.
W
12. *
13.
0
14.
DENOTES CHASSIS GROUND.
DENOTES CIRCUIT GROUND. (ASSEMBLY)
AVERAGE VALUE SHOWN, OPTIMT.,.'M VALUE SELECTED AT FACTORY,
COMPONENT MAY BE ABSENT.
DENOTES GROUND CONNECTION MADE WITH ASSEMBLY MOUNTING
SCREWS IN PLACE.
DENOTES SHIELDillG BEAD.
15.
REFERENCE DESIGNATORS PRINTED IN RED Il'.'DICATE BACKDATING
CHA.;.
"l'GES (SEE APPKNDIX C).
16.
�
DENOTES WIRE COLOR. CODE IS SAM:E AS THE RESISTOR COLOR CODE
(1.
e. ,
9
=
white,
8
=
gray, 4
yellow).
6·1/6-2
,�f':r.tinn VT