Maintenance—2246 1Y and 2246 Mod A Service
the solder connection with an approved flux-
removing solvent (such as isopropyl alcohol) and
allow it to air dry.
^ A /W W X A A «
£ CAUTION |
t w w w w w
Only an experienced maintenance person,
proficient in the use of vacuum-type de
soldering equipment should attempt repair of
any circuit board in this instrument. Many in
tegrated circuits are static sensitive and may
be damaged by solder extractors that gen
erate static charges. Perform work involving
static-sensitive devices only at a static-free
work station white wearing a grounded anti
static wrist strap. Use only an antistatic
vacuum-type solder extractor approved by a
Tektronix Service Center.
^ A A A /W W U p
£ CAUTION |
i v W
W
W
V
' S
Attempts to unsolder, remove, and resolder
leads from the component side of a circuit
board may cause damage to the reverse side
of the circuit board. The following techniques
should be used to replace a component on a
circuit board:
1. Touch the vacuum desoldering tool tip to the
lead at the solder connection. Never place the
tip directly on the board; doing so may damage
the board.
NOTE
Some components are difficult to remove
from the circuit board due to a bend placed in
the component leads during machine in
sertion. To make removal of m achine-
inserted components easier, straighten the
component leads on the reverse side of the
circuit board.
2.
When
removing
a
multipin
component,
especially an 1C, do not heat adjacent pins con
secutively. Apply heat to the pins at alternate
sides and ends of the 1C as solder is removed.
Allow a moment for the circuit board to cool
before proceeding to the next pin.
£ CAUTION |
A
a a
/
v w w
«
Excessive
heat can
cause
the etched circuit
conductors to separate from the circuit
board. Never allow the solder extractor tip to
remain at one place on the board for more
than three seconds. Solder wick, spring-
actuated or squeeze-bulb solder suckers,
and heat blocks (for desoldering multipin
components) must not be used. Damage
caused by poor soldering techniques can void
the instrument warranty.
3. Bend the leads of the replacement component
to fit the holes in the circuit board. If the com
ponent is replaced while the board is installed in
the instrument, cut the leads so they protrude
only a small amount through the reverse side of
the circuit board. Excess lead length may cause
shorting to other conductive parts.
4. Insert the leads into the holes of the board so
that the replacement component is positioned
the same as the original component. Most com
ponents should be firmly seated against the
circuit board.
5. Touch the soldering iron tip to the connection
and apply enough solder to make a firm solder
joint. Do not move the component while the
solder hardens.
6. Cut off any excess lead protruding through the
circuit board (if not clipped to the correct length
in step 3).
7. Clean the area around the solder connection
with an approved flux-removing solvent. Be
careful not to remove any of the printed infor
mation from the circuit board.
REMOVAL AND REPLACEMENT
INSTRUCTIONS
WARNING I
To avoid electric shock, disconnect the instru
ment from the power input source before
removing or replacing any component or
assembly.
The
exploded
view
drawings
in
Replaceable
Mechanical Parts list may be helpful during removal
6-38
Summary of Contents for 2246 1Y
Page 13: ...2246A Service 7062 01 X The 2246 1Y or 2246 Mod A Portable Oscilloscope ...
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Page 278: ...Figure 9 5b Detailed 2246 1Y or 2246 Mod A block diagram part 2 R E ...
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Page 304: ...A D D J U N 1991 ...
Page 311: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 1 0 V r l III B f e I l i 6555 39 ...
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Page 321: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 2 SET READOUT CONTROL CCW OFF 6555 40 ...
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Page 326: ...A B C P E F G ...
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Page 343: ...C l rti ...
Page 347: ...BEV JUNE 1991 7062 18 ...
Page 349: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 6 6555 43 I ...
Page 355: ...I BOARD LOCATION 8K 8J 8H 7H 8H 8H 7J 8D 7H 8H 8J 8J 7K 8K 10D 6L 6K 6L 6K 6G 5H I ...
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Page 372: ...2246 1Y and 2246 Mod A Service WAVEFORMS FOR DIAGRAM 9 MORE ...
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Page 380: ...WAVEFORMS FOR DIAGRAM 10 ...
Page 387: ...WAVEFORMS FOR DIAGRAM 11 6555 73 6557 48 ...
Page 394: ...WAVEFORMS FOR DIAGRAM 12 2246 1Y and 2246 Mod A Service i f I S 1 f c i 4 i ...
Page 395: ...WAVEFORMS FOR DIAGRAM 12 cont 2246 1Y and 2246 Mod A Service ...
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Page 400: ...REV JUNE 1991 7062 39 ...
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Page 406: ...B 2246 IV AND 2246 MOD A ...
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Page 415: ...2246 1Y 2246 MOD A ...
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