Heathkit SB-1000 - In Case of Difficulty

Heathkit
Page 65
IN CASE OF DIFFICULTY
NOTE: If you operate the Amplifier outside the specified power or frequency range (or
both), components may be damaged. Such damage is not covered by the Heath warranty.
This part of the Manual helps you locate and correct
any difficulty that might occur in your Amplifier.
This information is divided into two sections. The
first section, "General," contains suggestions for re-
viewing your kit to locate possible causes of incor-
rect performance.
The second section is a "Troubleshooting Chart.” This
chart describes specific problems that may o-ccur
and lists one or more conditions or components that
could cause each difficulty.
NOTE: In an extreme case where you are unable to
resolve a difficulty, refer to “Customer Service”
inside the rear cover of this Manual. Your Warranty
is located inside the front cover.
If it ever becomes necessary to take (or ship) your kit
to the Heath Company or to a Heath/Zenith
Computers and Electronics Center for repair, be sure it
is completely assembled -- including all of the knobs
and cabinet parts.
GENERAL
1. Recheck the wiring. Trace each lead in colored
pencil on the Pictorial as you check it. It is fre-
quently helpful to have a friend check your
work. Someone who is not familiar with the
unit may notice something that you have consis-
tently overlooked.
2. Check for bits of solder, wire ends, or other
foreign matter which may be lodged in the
wiring.
3. About 90% of the kits that are returned for
service do not function properly due to poor
connections and soldering. You can, therefore,
eliminate many troubles by reheating all con-
nections to make sure they are soldered pro-
perly, as described in the soldering instructions
in this Manual.
4, Make sure the tube lights up properly. If it
does not, remove the tube from its socket and
Pa check for continuity between pins 1 and 5 with
an ohmmeter. An infinite resistance indicates a
faulty tube filament.
5. Check the values of the parts. Be sure that the
proper part has been wired into the circuit at
each location as shown in the Pictorials and as
described in the wiring instructions.
6. A review of the Circuit Description may help
you locate the area of trouble.
NOTE: Refer to the "Circuit Board X-Ray Views"
(llustration Booklet, Page 67) for the physical
locations of parts.