Maintenance—7D14
Light-Bulb
Replacement
The
pushbutton
switches contain one
or more incandes
cent
light
bulb. To replace a defective light bulb,
use the
following
procedure:
1.
Remove
the switch from the instrument as instructed
under
Switch Replacement.
It is not necessary to
remove
the
wires from the switch circuit board.
2.
Clip off the
bulb leads near the bulb body.
3.
Remove
the
defective bulb from the plastic holder.
4.
Remove
the leads from
the circuit board.
Use a 15-
watt
pencil-type soldering iron.
5.
Remove
the excess solder from the
circuit board with
a
vacuum-type
desoldering tool.
6. Install the replacement
bulb so the bulb is centered in
the
plastic holder.
7. Solder
the leads to the
circuit
board.
8.
Replace the switch
in the instrument.
Transistor
and
Integrated
Circuit
Replacement
Transistors
and IC's should not be replaced unless they
are
actually
defective. If removed from their sockets during
routing
maintenance,
return them
to their original sockets.
Special
care must
be given
to integrated circuit leads,
because
they can easily be damaged in
removal from
sockets.
Unnecessary replacement or switching of compo
nents
may affect the calibration of the instrument. When a
transistor
is replaced, check the operation of the part of the
instrument
that may be affected.
Recalibration
After
Repair
After
any electrical
component has been replaced, the
calibration
of
that particular circuit should be checked, as
well as the calibration of other closely related
circuits. The
Performance
Check instructions given in Part I of Section 5
provide
a quick and convenient means of
checking the
instrument
operation. The Adjustment
procedure
in Part II
of Section
5 can then be used to adjust the operation to
meet
the Performance Requirements listed in Section 1.
4-6
Summary of Contents for 7D14
Page 4: ...7D14 ...
Page 11: ...Operating Instructions 7D14 Fig 2 1 7D14 front panel controls and connectors 2 2 ...
Page 33: ... 3 13 Fig 3 11 Logic diagram for Zero Cancel Logic stage Circuit Description 7D14 ...
Page 38: ...3 18 Fig 3 16 Time Base and Control circuit detailed block diagram Circuit Description 7D14 ...
Page 44: ...NOTES ...
Page 46: ...NJ Fig 4 1 Electrode configuration for semiconductors in this instrument I ...
Page 68: ...NOTES ...
Page 96: ... 7DI 4 DIGITAL COUNTER UNIT ...
Page 98: ...GRS 0371 BLOCK DIAGRAM ...
Page 99: ......
Page 103: ...0 0 I 200 mV 500 µs 0 001 200 mV 500 µs 0 001 MHz 00 mV E 00 µs 0 001 MHz ...
Page 106: ...1 ...
Page 110: ...A2 Logic Circuit Board Assembly jQ798i 798 jc743 CR744t uni R724 R742 JL744S FrR796 ...
Page 113: ......
Page 114: ...P 0 A2 LOGIC BOARD ...
Page 121: ... A B D t F H J NPR Tj ZWX V A AC M AEA HUM qAZ DEF HJ N P R S T J V V7X y ABM APAI AA 7DI4 ...
Page 129: ......
Page 130: ...4 7D14 DIGITAL COUNTER ...