HP 3465B - Page 55

Section VII
Model 3465B
a. Verify the following input signals:
SIGNAL
RESET
(U11 PIN 6) 400 ms
T
>15 Msec PULSE
TXFR
(U11 PIN 51
200 ms
400 ms
NOTE
It Is essential the dock frequency be verified. An In
correct dock frequency can make U17 appear defec
tive.
CLOCK
(TEST POINT
I CL
J
10 Msec -
b. Verify the following output signals:
-7
r
0
- 7
1. Connect test point RS to - 7 V and verify COUNT
EXTEND output for a 10 microsecond pulse going
LOW (- 7 V) at A1U6 pin 10 every 0.1 seconds.
2. Remove jumper between test point RS and - 7 V.
Verify MSD. 2MSD, 3MSD and LSD drive lines
from AlUlO as follows:
MSD
(U10 PIN 3)
2MSD
(U10 PIN 10)
3MSD
(U10PIN 11)
LSD
(U10 PIN 4)
- 600 ms
- 600 ms
600 ms
600 ms ■
rr
-7
0
-7
0
- 7
0
-7
Return the Analog/Digital Isolation Jumper to its original
position (connect test point COMP to CP).
REFERENCE DESIGNATIONS
ASSEMBLY REFERENCE ASSEMBLY ASSEMBJ^ ^RX NuMB_ER_
DESIGNATION NAME (INCLUDES A2AI SUBASSEMBLY)
JACK XA2 IS MOUNTED ON
CHASSIS OR ANOTHER ASSEMBLY,
A2
POWER SUPPLY (OOXXX-66501)
^PLUG PI IS MOUNTED ON ASSEMBLY OR IS PART
y^OF the assembly board (COMPLETE DESIGNATOR IS A2PI)
PI IS NOT MOUNTED
ON A2 ASSEMBLY
(COMPLETE DESIGNATOR IS PI)
TEST VOLTAGE^
■f 2.92V
Ql
^^^COMPLETE DESIGNATOR IS A2R4
NUMBER INDICATES
PIN OF XA2 AND PI
SUBASSEMBLY OF A2
^(COMPLETE DESIGNATOR IS A2AI}
A!
[photo-chopper osc ~|
l\ \X,
DENOTES SCHEMATIC
ON WHICH CONNECTION
IS MADE
WIRE color: color code is the same
AS THE RESISTOR COLOR CODE. FIRST
NUMBER INDICATES BASE COLOR, SECOND
NUMBER INDENTIFIES WIDER STRIP. AND
THE THIRD INDICATES THE NARROWER
STRIP. (.924, DENOTES WHT/RED/YEL WIRE)
EYELET OR STAND-
I OFF TERMINAL. MAY OR
, MAY NOT BE NUMBERED
9
COMPLETE
DESIGNATOR
IS A2AIRI
MALE STANDOFF
PIN CONNECTOR
MAY OR MAY
NOT BE NUMBERED
)FF \
o_
FEMALE PIN
CONNECTOR ON
A WHT/RED WIRE
PARTIAL REFERENCE DESIGNATIONS ARE SHOWN: PREFIX WITH ASSEMBLY OR SUBASSEMBLY
DESIGNATION(S) OR BOTH FOR COMPLETE DESIGNATION
7-6