Tektronix 5110, Инструкция по эксплуатации

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Maintenance-5110
Bulb
Replacement
To replace the knob-skirt deflection-factor readout
bulbs, proceed as follows:
NOTE
To gain access to bulbs on some instruments, it may
be necessary to remove circuit boards and pushbut­
ton switch extension shafts. Extension shafts are
removed and installed by pulling straight off and
pushing straight on.
1. Remove the light shield.
2. Unsolder the defective bulb, and install its replace­
ment.
3. Replace the light shield.
Power Transformer Replacement
Replace the power transformer only with a direct
replacement transformer. When removing the
transformer, be sure to mark the leads to aid in connecting
the new transformer. After the transformer has been
replaced, check the performance of the complete instru­
ment usi ng the procedure given in the Adjustment section.
Fuse Replacement
Table 4-4 gives the rating, location, and function of the
fuses used in this instrument.
Table 4-4
FUSE RATING, LOCATION AND FUNCTION
Circuit
Number
Rating Function
Location
F201
1.6 A Slow-
blow
110 V Line­
voltage input
Rear panel
F201
1 A Slow-
blow 220 V Line­
voltage input
Rear panel
F810 0.25 A Fast­
blow
+200 V Unrgltd
supply
Rear, LV Power
Supply board
F835
0.5 A Fast­
blow
+38 V Unrgltd
supply
Rear, LV Power
Supply board
ADJUSTMENT AFTER REPAIR
After any electrical component has been replaced, the
adjustment of that particular circuit should be checked, as
well as other closely related circuits. See Section 3 fora
complete adjustment procedure.
MODIFICATIONS TO PRE-OPTION 7
AMPLIFIER PLUG-INS
(OPTION 7 ONLY)
The channel switching amplifier plug-ins that are
recommended for use with 5100-series mainframes
(5A14N, 5A18N, 5A26) have been modified to reduce
display noise and chop breakthrough when used in an
Option 7 mainframe. If any of the mentioned amplifier
plug-ins cause the noise and chop breakthrough
specification to be exceeded, an earlier version (before
Option 7) of the plug-in is probably being used. The
following information is provided to explain howto modify
earlier version plug-ins for reduced display noise and
chop breakthrough.
To modify a 5A14N (SN B063288 and below only)
change R513, R523, and R533onthe Main circuit board to
a 100 kΩ, 5%, 0.25 W composition resistor, Tektronix Part
No. 315-0104-00. Cut the board run (at both components)
that connect Q540 and R542, so as to remove electrically,
the run from the front side of the board. Connect an
insulated wire strap between Q540 and R542, on the back
side of the board so as to replace the board run removed
from the front.
To modify a 5A18N (SN B050000 to SN B099999 only)
change R301 on the Main Amplifier circuit board to a
20 kΩ, 5%, 0.25W composition resistor, Tektronix Part No.
315-0203-00.
To modify a 5A18N (SN B049999 and below only)
change R301 on the Main Amplifier circuit board to a
20 kΩ, 5%, 0.25W composition resistor, Tektronix Part No.
315-0203-00. Also, change R302 and R303 to a 10 kΩ, 1%,
0.125 W film resistor, Tektronix Part No. 321-0289-00.
To modify a 5A26(SN B029000and below only) change
R289 on the Main circuit board to a 20 kΩ, 5%. 0.25 W
composition resistor, Tektronix Part No. 315-0203-00.
Also, change Q386 to a NPN silicon transistor, 2N3565,
TO-106 case, Tektronix Part No. 151-0341-00.
4-16
REV A, NOV 1978