Power Supply And Crt Display - Tektronix 2215A Instruction Manual

Adjustment Procedure—2215A Service

POWER SUPPLY AND CRT DISPLAY

Equipment Required (See Table 4-1):
Leveled Sine-Wave Generator (Item 2)
Time-Mark Generator (Item 3)
50-0 BNC Cable (Item 4)
50-0 BNC Termination (Item 5)
a t th e b a c k o f th is m a n u a l fo r lo c a tio n o f te s t p o in ts a n d a d ju stm e n ts.
INITIAL CONTROL SETTINGS
Vertical
POSITION (both)
VERTICAL MODE
CH 1 VOLTS/DIV
CH 1 VOLTS/DIV Variable
Channel 1 Input Coupling
srizontal
POSITION
HORIZONTAL MODE
A SEC/DIV
SEC/DIV Variable
X I0 Magnifier
TRIGGER
VAR HOLDOFF
Mode
SLOPE
LEVEL
A&B INT
A SOURCE
PROCEDURE STEPS
1. Check/Adjust Power Supply DC Levels (R938)
NOTE
R e vie w the in fo rm a tio n a t th e b e ginn in g o f th e A d ju s t­
m e n t P ro ced u re b e fo re s ta rtin g this step.
5-4
Digital Voltmeter (Item 10)
DC Voltmeter (Item 12)
Screwdriver (Item 13)
See
ADJUSTMENT LOCATIONS S I
Midrange
CH 1
10 mV
CAL detent
GND
Midrange
A
X-Y
CAL detent
Off (knob in)
NORM
P-P AUTO
OUT
Midrange
VERT MODE
INT
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 —8.56 to -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 0 V.
d. CHECK— Voltage levels of the remaining power sup­
plies listed in Table 5-2 are within the specified limits.
Table 5-2
Power Supply Limits
Power Test
Supply Point
- 8 .6 V
TP961
+ 5.2 V W968
W960
+ 8.6 V
W956
+ 30 V
W954
+ 100 V
e. Disconnect the test equipment from the instrument.
Reading
(Volts)
-8 .5 6 to -8 .6 4
+ 5.04 to +5.36
+ 8.43 to +8.77
+29.1 to +30.9
+ 97.0 to +103.0