Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 211

MAINTENANCE WJ-8718-19/FE HF RECEIVER
4.3.5.2 Component Replacement
Guidelines for replacing the various kinds of components are as follows.
1. When soldering or unsoldering diodes or resistors, solder
quickly to allow as little heat conduction as possible.
When wiring permits, use a heat sink between the
soldering iron and the part.
2. When soldering or unsoldering transistors, use a low
wattage iron and a heat sink. Solder as quickly as
possible. The use of a circular soldering tip to heat all
three or four joints simultaneously is recommended.
3. When soldering or unsoldering glass or ceramic
capacitors, use a heat sink between the capacitor and
the iron. Excessive heat will crack the capacitor body.
4. When any electronic part is removed, note the position
of the part and its leads, and replace it the same way.
4.3.5.3 Realignment
Replacement of semiconductors or tuned circuit components may affect
the alignment of the PC board being repaired. Realignment may be necessary to return
.he PC board to normal operation.
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