Adjustment Procedure—2246 1Y and 2246 Mod A Service
POWER SUPPLY, DISPLAY, AND Z-AXIS
Equipment Required (See Table 4-1):
Digital Multimeter (DMM)
50 n Coaxial Cable
Leveled Sine— Wave Generator
50 f l Termination
Test Oscilloscope w /lO X Probe
See the
ADJUSTMENT LOCATIONS section
at the back of this manual for locations of test points and adjustments.
INITIAL CONTROL SETTINGS
1. Set:
Vertical MODE
CH 1
CH 1 COUPLING
DC
VOLTS/DIV
0.1 V
Vertical POSITION
Controls
12 o ’clock
Horizontal MODE
A
A/B SELECT
A
SEC/DIV
0.1 ms
Trigger LEVEL
12 o ’clock
HOLDOFF
min (CCW)
SLOPE
-J~
Trigger MODE
AUTO LEVEL
Trigger SOURCE
CH 1
Trigger COUPLING
DC
MEASUREMENTS
OFF
MENU Displays
OFF
A INTEN
10 o ’clock
READOUT
12 o ’clock
FOCUS
for well defined display
SCALE ILLUM
fully CCW
PROCEDURE
1. Power Supply DC Levels (R2252)
a. Connect a Digital Multimeter (DMM) negative
lead to chassis ground. Connect positive lead to
first test point listed in Table 5-2 (all test points
on J1204, Main board).
b. CHECK—Voltage reading is within the range
given in Table 5-2.
c. Move DMM positive lead to each of the other
supply voltages in Table 5-2 and check that
voltage ranges are within limits.
NOTE
If all supply voltages are within the limits
given in Table 5-2, it is not necessary to
adjust the power supply. If voltages are not
within limits, you will have to adjust the
+7.5 V supply, recheck the other voltages,
and continue with a complete readjustment of
the instrument.
d. Connect a Digital Multimeter (DMM) negative
lead to chassis ground and positive lead to
+7.5 V test point (J2104-8).
e. 7.5 V ADJ (R2252) for +7.5 V and
check that all supply voltages in Table 5-2 are
within
limits.
The
+7.5
V
Adjustment
is
accessible through the right side frame.
5-4
f.
Disconnect Digital Multimeter.
Summary of Contents for 2246 1Y
Page 13: ...2246A Service 7062 01 X The 2246 1Y or 2246 Mod A Portable Oscilloscope ...
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Page 304: ...A D D J U N 1991 ...
Page 311: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 1 0 V r l III B f e I l i 6555 39 ...
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Page 321: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 2 SET READOUT CONTROL CCW OFF 6555 40 ...
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Page 347: ...BEV JUNE 1991 7062 18 ...
Page 349: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 6 6555 43 I ...
Page 355: ...I BOARD LOCATION 8K 8J 8H 7H 8H 8H 7J 8D 7H 8H 8J 8J 7K 8K 10D 6L 6K 6L 6K 6G 5H I ...
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