Tektronix 5110, Instruction Manual

Page: 37 / 128

Adjustment-5110
TIME-BASE PLUG-IN
Display
Position
Seconds/Div
Seconds/Div
Cal
Swp Mag
Triggering
Triggering Source
Chop
Centered
1
ms
Fully clockwise
Off
+ Slope, Auto Trig,
ac Coupl
Composite
ADJUSTMENT PROCEDURE
1. Adjust —30 Volt Power Supply
a. Turn over the oscilloscope to lay on its left side to
gain access to the LV Power Supply circuit board.
b. Connect the digital voltmeter between the —30 V
test point and ground. See Fig. 3-1 for voltage test point
location.
c. Check— for a meter reading of —29.89 to —30.11
volts.
NOTE
If the 30 volt supply is within the specified
tolerance, proceed with step 2. If the —30 volt
adjustment is to be made, all circuits will be affected
and the entire power supply adjustment procedure
should be performed to verify the accuracy of the
supplies.
d. Adjust----- 30 V Adj R878 for a meter reading of
exactly —30 volts. See Fig. 3-1 for adjustment location.
2. Adjust +30 Volt Power Supply
a. Connect the digital voltmeter between the +30 V test
point and ground. See Fig. 3-1 for voltage test point
location.
b. Check— for a meter reading of +29.82 to +30.18
volts.
NOTE
If the +30 volt supply is within the specified
tolerance, proceed with step 3. If the +30 volts
adjustment is to be made, all circuits will be affected
and the entire power supply adjustment procedure
should be performed to verify the accuracy of the
supplies.
c. 30 V Adj R858 for a meter reading of
e30 volts. See Fig. 3-1 for adjustment location.
3. Check Remaining Power Supply Voltages
a. Connect the digital voltmeter between the +5 V test
point and ground. See Fig. 3-1 for voltage test point
location.
b. Check— for a meter reading of +4.89 to +5.11 volts.
c. Connect the digital voltmeter between the +200 V
test point and ground. See Fig. 3-1 for voltage test point
location.
d. Check—for a meter reading of +175 to +247.5 volts.
NOTE
Ripple and regulation of the individual supplies can
be checked using the procedure given under
Troubleshooting Techniques in the Maintenance
section of this manual.
4. Check Calibrator Output Voltage
a. Connect the digital voltmeter between the
CALIBRATOR current loop on the front panel, and a
ground test point. See Fig. 3-1 for ground test point
location.
R85t>
30
V ADJ
o
'¾: *
GROUND
Fig. 3-1. Locations of power-supply test points and adjustments.
so
2I34O7
3-3