Power Supply And Crt Display; Power Supply Limits - Tektronix 2236 Instruction Manual

Adjustment Procedure— 2236 Service
Equipment Required (see Table 4-1):
Leveled Sine-Wave Generator (Item 2)
Time-Mark Generator (Item 3)
50-12 BNC Cable (Item 8)
50-12 BNC Termination (Item 9)
INITIAL CONTROL SETTINGS
Vertical
POSITION (both)
VERTICAL MODE
CH 1 VOLTS/DIV
CH 1 VOLTS/DIV Variable
Channel 1 Input Coupling
Horizontal
POSITION
HORIZONTAL MODE
A SEC/DIV
SEC/DIV Variable
X I0 Magnifier
A TRIGGER
VAR HOLDOFF
Mode
SLOPE
LEVEL
A&B INT
A SOURCE
PROCEDURE STEPS
1. Check/Adjust Power Supply DC Levels (R938)
Review the information at the beginning of the Adjust­
ment Procedure before starting this step.
5-4

POWER SUPPLY AND CRT DISPLAY

See
at the back of this manual for test point and adjustment locations.
Midrange
CH 1
5 mV
CAL detent
GND
Midrange
A
X-Y
CAL detent
Off (knob in)
NORM
P-P AUTO
OUT
Midrange
VERT MODE
INT
NOTE
Digital Voltmeter (Item 22)
DC Voltmeter (Item 24)
Screwdriver (Item 25)
ADJUSTMENT LOCATIONS 1
a. Connect the digital voltmeter low lead to chassis
ground and connect the volts lead to the — 8.6-V supply
(TP961).
b. CHECK—Voltmeter reading is between —8.56 and
-8 .6 4 V. If the reading is within these limits, skip to part d.
c. ADJUST—The -8 .6 V Adj potentiometer (R938) for a
voltmeter reading of -8 .6 V.
d. CHECK— Voltage levels of the remaining power sup-
plies listed in Table 5-2 are within the specified limits.
Power
Supply
-8 .6 V
+ 5.0 V
+ 8.6 V
+30 V
+ 100 V
e. Disconnect the test equipment from the instrument.
Table 5-2

Power Supply Limits

Reading
Test
Point
(V)
TP961 -8 .5 6 to -8 .6 4
W968 + 4.85 to +5.15
+ 8.43 to +8.77
W960
W956 + 29.1 to +30.9
W954
+97.0 to +103.0
REV JAN 1985