Tektronix 2465A Service Manual page 303

2465A/2467 Service
A B
C
1
2
6019-17
Figure 10-9. A 14-Dynamic Centering board.
@ Static Sensitive Devices
See Maintenance Section
COMPONENT NUMBER EXAMPLE
Compone~t Number
r
A23TR1234
T
~Schematic
Assembly
_j
L '
Circuit
Number Subassembly Number
Number (if used)
Chassis-mounted components have no Assembly Number
prefix-see end of Replaceable Electrical Parts list.
A 14-DYNAMIC CENTERING BOARD
CIRCUIT SCHEM CIRCUIT SCHEM CIRCUIT SCHEM CIRCUIT SCHEM
NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER
C3401
6
R3403 6 R3408 6 U3402 6
J141 6 R3404 6 R3409 6 VR3401 6
J141 6 R3405 6 R3410 6
R3401 6 R3406 6 R3411 6
R3402 6 R3407 6 U3401 6
A 14-DYNAMIC CENTERING
~
TEST WAVEFORM SETUP INFORMATION
The numbered waveforms below were obtained at the test points indicated on the accompanying schematic diagram and
board dolly. The waveforms are representative of signals that may be expected at the associated points when the following
setup conditions are observed. Any change(s) from the given setup conditions required to produce a given waveform are
noted with that waveform illustration. Where B Sweep setup conditions are referenced with a waveform, it is assumed that
the B SEC/DIV knob is set to 100 µs/div unless otherwise noted.
2465A SETUP
Connect a 200-mV, 1-kHz squarewave to the CH1 input
of the oscilloscope using a BNC cable.
Set:
VERTICAL MODE
Input Coupling
CH1 and CH2
VOLTS/DIV
CH1 and CH2
CH1 and CH2 VAR
A and B SEC/DIV
A and B SEC/DIV VAR
TRIGGER
MODE
SOURCE
COUPLING
HOLDOFF
SLOPE
LEVEL
+3V-
0
-3V-
CH1
1 Mf! DC
50mV
In detent
200
µS
(knobs locked)
In detent
AUTO
VERT
NOISE REJ
In detent
+
(plus)
Stably triggered display
II/READOUT ON, SIGNAL CONSTANTLY CHANGES
+1V-
0
-1V-
II /READOUT ON , SIGNAL CONSTANTLY CHANGES
~t
~t readout
d REF OR DL Y POS 1000.0
µs
readout
INTENSITY Midrange
READOUT INTENSITY Minimum (once dt
readout is set)
All other control settings are irrelevant.
TEST OSCILLOSCOPE SETUP
Using a X10 probe with the test oscilloscope, set its
Trigger Slope, Trigger Level, Volts/Div and Time/Div
ranges as required to obtain the indicated displays.
l+--3ms--!
+4V-
0
0V-
. .
II /READOUT OFF
~ 3 m s - - !
+4V-
. . . .
,..
0
0V-..-- - - - - - - - ~ - - - - -
i..------
+190mV-
0
0V-
W/READOUT OFF
~ 3 m s - - !
-
(52 MAY LOOK LIKE 53) W/READOUT OFF
0V-
0
-190MV-
W/READOU
+100mV- fl.If/Ill
-150mV-
,.,,~ I
VARIES W/READC
+100mV-. •
\\I \\.
0
0V-
-t50mv-•\
I
VARIES W/READOI
+30V- ;. ~ ,
+22V- -
VARIES W/READ1
Ef ,,
+27V-
JUU1
+24V- • .-
VARIES W/READC
+4V-,...
Ii
0
0V-
B