Table of Contents
Advertisement
IN CASE OF DIFFICULTY
This section of the Manual is divided into two parts. The
first part, titled "General Troubleshooting Information,"
describes what to do about the difficulties that may occur
right after your Clock is assembled.
The second part, titled "Troubleshooting Chart," is provided
to assist you
in servicing the Clock if the "General
Troubleshooting Information" fails to clear up the problem,
or if difficulties occur after your Clock has been in use for
some time. The "Troubleshooting Chart" lists a number of
possible difficulties that could arise along with several
possible solutions to those difficulties.
Try to analyze the symptoms of any problem you might
have before starting any troubleshooting procedure. This can
usually be accomplished by trying the various functions of
your Clock to determine abnormal operations. A review of
the "Operation" section above may help your analysis.
NOTE: Refer to the "Circuit Board X-Ray Views" on Pages
28 and 29 for the physical location of parts on the circuit
boards.
GENERAL TROUBLESHOOTING INFORMATION
1.
Check all the wires that are connected between the
two circuit boards and between the circuit boards and
other parts. Trace each wire in colored pencil on the
Pictorial as it is checked. Make sure these wires are
connected to the proper points and are properly
soldered. Someone who is not familiar with the unit
may
notice
something
you
have
consistently
overlooked.
2.
Be sure the 1C is seated properly in its socket.
3.
About 90% of the kits that are returned for repair do
not function properly because of poor connections
and soldering. Therefore, many troubles can be
located by a careful inspection of connections to make
sure they are soldered as described in the "Soldering"
section of the "Kit Builders Guide." Reheat any
doubtful connections.
4.
Closely examine each circuit board foil in a good light
to see that no solder bridges exist between adjacent
connections. If available, a magnifying glass would be
helpful for this purpose. Remove any solder bridges by
holding a clean, hot soldering iron tip between the two
points that are bridged until the excess solder flows
down onto the tip. Compare your foil pattern against
the "X-Ray Views" on Pages 28 and 29.
5.
Be sure each transistor is in its proper location (correct
part number and/or type number). Be sure that each
transistor lead is in the right hole and has a good
solder connection to the foil.
6.
Check the integrated circuit for proper positioning.
(Be sure the dot or notched end of the 1C is over the
half dot printed on the circuit board.)
7.
Check each capacitor value. Be sure that a capacitor of
correct value is installed at each capacitor location.
Check each electrolytic capacitor to be sure the lead
near the positive (+) marking is at the correct position.
8.
Check each resistor value carefully. It would be easy,
for example, to install a 2200 ft (red-red-red) resistor
where a 22 kft (red-red-orange) resistor is called for. A
resistor that is discolored, or cracked, or shows any
sign of bulging would indicate that it is damaged and
should be replaced. Since damaged resistors are often
the result of some other difficulty (such as faulty
wiring), you should try to find out what caused the
damage before you replace the part.
9.
Be sure the correct diode is installed at each diode
location, and that the banded end is positioned
correctly.
10. Check all component leads connected to the circuit
boards. Make sure the leads do not extend through the
circuit
board
and
come
in contact with other
connections or parts.
If you still cannot locate and correct the trouble after the
above tests are completed, and if a voltmeter is available,
check your Clock's voltages against the voltages shown on
the Schematic Diagram (fold-out from Page 31) and in the
"Circuit Board Voltage Charts" (Page 30).
NOTE: In an extreme case where you are unable to resolve a
difficulty, refer to the "Customer Service" information
inside the rear cover of the Manual. Vour Warranty is
located inside the front cover of the Manual.
(
WARNING: Hazardous voltages are exposed in the Clock
when the cabinet top is removed and the line cord is plugged
into the AC outlet. See "Chassis Photograph
"
on Page 27.
Advertisement
Table of Contents
