Lambda LL Series Instruction Manual page 12

on the wiring. A brass probe can be soldered to an alligator clip adapted to the
measuring instrument.
35 Wherever possible use a heat sink when soldering transistors.
4. Broken or damaged printed wiring is usually the result of an imperfection,
strain or careless soldering. To repair small breaks, tin a short piece of hook-up
wire to bridge the break, and holding the wire in place, flow solder along the
length of wire so that it becomes part of the circuitry.
— When unsolder ing components from the board never pry or force loose the
part; unsolder the component by using the wicking process described below:
(a) Select a 3/16 inch tinned copper braid for use as a wick; if braid is
not available, select AWG No. 14 or No. 16 stranded wire with 1/2 inch insulation
removed.
(b) Dip the wick in liquid rosin flux.
(c) Place the wick onto the soldered connection and apply soldering iron onto
the wick.
(d) When sufficient amount of solder flows onto the wick, freeing the compon-
ent, simultaneously remove iron and wick.
TROUBLE CHART
The trouble chart is intended as a guide for locating trouble causes, and is
used along with the schematic diagram.
The operating conditions assumed for the trouble chart are as follows:
(a) AC power of proper voltage and frequency is preset at input terminals.
(b) Either positive or negative terminal is connected to chassis ground.
TROUBLE SHOOTING CHART
Symptom Probable Cause Remedy
l. Zero volts DC output VOLTAGE ADJ. controls Check VOLTAGE ADJ. controls
Р turned fully CCW for proper setting and cor-
rect as necessary
CURRENT ADJ. control Check CURRENT ADJ. control
turned fully CCW for proper setting and
correct as necessamy
Short circuit across Check load and load con-
output of supply nections, correct as nec-
essary
Shorted SCR101 (suffix Check SCR101 for short
"OV" models only) and replace as necesary
8 f IM-LL