Tektronix 213 DMM Instruction Manual page 50

Maintenance-213 Service
Disassembly. The probe can be disassembled by referring
to the Exploded View drawing in the Mechanical Parts List
section and the following disassembly instructions:
1. The test prod tip is retained by a tight fit only, and is
removed and reinstalled by pulling it off or pushing it on
the probe body assembly.
2. The probe body assembly is removed by pulling it out
of the cable assembly probe head, and reinstalled by push-
ing it onto the same probe head.
3. The common clip lead is removed from and reinstalled
on the probe head by pulling it out of or pushing it into the
slot in the probe head.
COAXIAL-TYPE END LEAD CONNECTOR REPLACE-
MENT. Replacement of the coaxialtype end lead connec-
tor, such as used on the probe lead and its corresponding
instrument lead, requires special tools and techniques. It
is recommended that the complete lead assembly be re-
placed, or that replacement be referred to the local Tek-
tronix Field Office or representative.
LED ASSEMBLY REPLACEMENT. Replacement instruc-
tions for the LED Assembly are included in the Side Panel
Removal and Replacement instructions.
INTERCONNECTING CABLE AND TERMINAL CONNEC-
TOR REPLACEMENT. The interconnecting cable assem-
blies are factory ' assembled items, and consist of machine
installed end-lead connectors mounted in plastic holders to
make up multi-connector plugs. The plastic holders are easi-
ly replaced as individual items, but if the cables are faulty,
it is recommended that these be replaced as a complete as-
sembly.
It is possible for the end-lead terminal connectors to become
dislodged from the plastic holders. If this happens, the con-
nector can be reinstalled as follows (see Figure 4-10):
~,
CRIMPED SIDE
~~'
OF TERMINAL
~
;
~-<c>
CONNECTOR _ . - - I
FACES TOWARD
I
HINGED PORTION
OF HOLDER
1481-27
Fig. 4-10. Terminal connector holder.
4-12
1. Bend the grooved portion of the holder (part nearest the
cable) away from the cable in the direction of its hinged
side.
2. Reinsert the connector into its proper hole in the plug-in
portion of the holder (see color coding comment in next
paragraph) and bend the grooved part of the holder so the
connector is inserted into the groove.
The plastic holder has each connector hole numbered, ex-
cept number one which is identified with an triangle or
dot. Except for the crt three-terminal connector holder,
each cable or wire connected to each connector is EIA color
coded (see Troubleshooting Aids) to match each connector
hole number (e.g., the arrow head which is pin number 1 is
brown striped, pin 2 is red striped, pin 6 is blue striped, etc).
CIRCUIT BOARD TERMINAL PIN AND TERMINAL PIN
SOCKET REPLACEMENT. A circuit board terminal pin
replacement kit including the necessary tools, instructions,
and replacement pins is available from Tektronix, Inc. or
through the local Tektronix Field Representative (Tektro-
nix Part No. 040-0542-00).
Terminal Pin. To replace a terminal pin, proceed as follows:
~
It is essential that extreme care be used with the
soldering iron when removing or installing the
terminal pins in the circuit board. Board dela-
mination can easily occur which is difficult or
impossible to repair, especially in the case of
multi-layer circuit boards as used in this instru-
ment.
1. While using a 15 watt soldering iron to unsolder the pin,
use a pair of pliers to pull the pin out of its ferrule which
should remain in the circuit board. If the pin is too short
to use the pliers, it can be pushed out with any round device
not over 0.028 inch in diameter.
2. Use a 0.031 inch drill to carefully ream out the inside of
the old ferrule that remained in the circuit board.
3. Remove the ferrule from the new pin, then insert and
position the new terminal pin in the ferrule that was left in
the circuit board. When the pin is properly positioned,
carefully solder it on both sides of the circuit board.
Terminal Pin Socket. To replace terminal pin sockets, pro-
ceed as follows:
REV. A, MAR. 1976