HP 654A Operating And Service Manual page 63

Model 654A
Section VII
SECTION VII
CIRCUIT DIAGRAMS
7-1. INTRODUCTION .
7-2. 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
printed circuit board and the 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.
REFERENCE DESIGNATIONS
ASSEMBLY ASSEMBLY
REFERENCE ASSEMBLY PART NUMBER
DESIGNATION NAME (INCLUDES 4241 SUBASSEMBLY)
JACK XA2 IS MOUNTED ON
CHASSIS OR ANOTHER ASSEMBLY
\,
.*\
2
PI IS NOT MOUNTED
ON 42 ASSEMBLY
(COMPLETE DESIGNATOR IS PI)
4
1
...
kNUMBER INDICATES
PIN OF XA2 AND PI
42
POWER SUPPLY 100XXX - 66
501)
PLUG PI IS MOUNTED ON ASSEMBLY OR IS PART
..
{
V
.
OF THE ASSEMBLY BOARD (COMPLETE DESIGNATOR IS A2PI)
R3
TEST VOLTAGE
A
,..--e-COMPLETE DESIGNATOR IS A2R4
4
,924, I 8
4.l
WIRE COLOR: COLOR CODE IS THE SAME I 's.k
/
AS THE RESISTOR COLOR CODE. FIRST EYELET OR STAND—
NUMBER INDICATES BASE COLOR, SECOND
I
OFF TERMINAL, MAY OR
NUMBER INDENTIFIES WIDER STRIP, AND
i
MAY NOT BE NUMBERED
THE THIRD INDICATES THE NARROWER
r
e/
Al
F HOTO-CHOPPER OSC
STRIP. ( 924, DENOTES WHT/RED/YEL WIRE) I
+2.92V
SUBASSEMBLY OF A2
(COMPLETE DESIGNATOR IS A2AI)
RI
COMPLETE
DESIGNATOR
IS 42AIRI
PI
3
DENOTES SIGNAL
CONNECTION
XA2
2
1 ç
DENOTES SCHEMATIC
ON WHICH CONNECTION
IS MADE
1
I 92
R2
MALE STANDOFF 1
\-
FEMALE PIN
PIN CONNECTOR CONNECTOR ON
MAY OR MAY A WHT/RED WIRE
Nor
BE NUMBERED
Nt"
1
/
4
t1
/ a
s""
PARTIAL REFERENCE DESIGNATIONS ARE SHOWN: PREFIX WITH ASSEMBLY OR SUBASSEMBLY
DESIGNATION(S) OR BOTH FOR COMPLETE DESIGNATION
SIS- B-2192
7-1