Tektronix TYPE Z PLIG-IN Instruction Manual page 21

Soldering Precautions
In the production of Tektronix instruments, a special
silver-bearing solder is used to establish a bond to the
ceramic terminal strips. This bond may be broken by the
repeated use of ordinary tin-lead solder, or by the appli­
cation of too much heat.
solder will not break the bond however, if too much heat
is not applied.
If continued maintenance work is to be performed on
Tektronix instruments, it is advisable to have a stock of
solder containing about 3% silver.
used often for work on etched-circuit boards and should
be readily available. It may also be purchased directly
from Tektronix in one pound rolls (part number 251-514).
Because of the shape of the terminals on the ceramic
terminal strips, the soldering iron should have a wedge-
shaped tip. A tip such as this allows the heat to be ap­
plied directly to the solder in the terminals and reduces
the amount of heat required. It is important to use as little
heat as is possible. Do not use force or twist the tip in
the slot as this may chip or break the ceramic strip.
REPLACEMENT PARTS
Standard Parts
Replacement for all parts used in the Type Z Unit can
be purchased directly from Tektronix at current net prices.
Many of the components, however, are standard electronic
parts that can generally be obtained locally in less time
than required to obtain them from the factory.
purchasing a part, be sure to consult the Parts List to de­
termine the tolerances and rating required. The Parts List
gives the values, tolerances, ratings, and Tektronix part
number of all components used in the instrument.
Special Parts
In addition to the standard electronic components men­
tioned in the previous paragraph, special parts are also
used. These parts are manufactured or selected by Tek­
tronix to satisfy particular
factured especially for Tektronix by other companies. These
parts and most mechanical parts should be ordered directly
from Tektronix since they are normally difficult or impossi­
ble to obtain from other sources. All parts may be obtained
through your local Tektronix Field Engineering Office.
TROUBLESHOOTING
General Information
This portion of the manual will aid you in troubleshoot­
ing the Z Unit in the event that trouble develops. During
troubleshooting work, the information
Occasional use of ordinary
This type of solder is
Before
requirements, or are manu­
contained in this
section should be correlated with
sections of the manual.
No attempt is made to give complete step-by-step pro­
cedures for finding the cause of each possible type of
trouble. Instead, an attempt is made to outline a general
troubleshooting guide. This guide provides a means for
determining the probable cause of a trouble from symptoms
observed before detailed checks are made.
A schematic diagram of the Z Unit is contained at the
rear of this manual. The reference designation of each
component is shown on the circuit diagram.
All wiring used in the Z Unit is color coded. This greatly
simplifies circuit tracing in the instrument.
Preliminary Troubleshooting
Before attempting any troubleshooting work, check all
front-panel controls for proper settings. If in doubt as to
the settings of the controls, refer to the Operating Instructions
section.
1. Visual Operational checks
A good procedure to follow when trouble occurs in the
Z Unit is to make a careful visual check of the instrument
and the input connections. A source of trouble can often
be detected by visual means. If no trouble is visible, apply
an input signal and observe the CRT for proper wave­
shapes. Adjust the front-panel controls to see the effect
of each. The normal or abnormal operation of each con­
trol will indicate what sort of trouble is encountered. Once
the symptoms are clearly established, the faulty circuit can
usually be isolated more readily.
2. Oscilloscope or Z Unit
When following a troubleshooting procedure, it is as­
sumed that the oscilloscope used with the Z Unit is operat­
ing normally. This is not always the case.
check the operation of the oscilloscope before attempting
to troubleshoot the Z Unit. Troubles occurring in the oscillo­
scope can usually be detected by substituting another
plug-in unit for the Z Unit and checking for proper opera­
tion.
Troubleshooting Procedures
The troubleshooting procedures that follow are divided
into sections according to trouble symptoms. When a trou­
ble occurs in the unit, the proper troubleshooting section
can be quickly found.
1. Incorrect Gain
Improper gain may be caused by any of several condi­
tions in the unit. However, as a first check, see if the
G A IN ADJUST control will correct the gain. Refer to the
Operating Instructions section which describes how to make
the adjustment. Then, if necessary, check the tubes and
Maintenance — Type Z
information in other
If in doubt,
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