Heathkit SB-104 - Troubleshooting; Introduction

TROUBLESHOOTING
CONTENTS
Introduction.. ............. 263
Localizing the Trouble.
... 264
........ VFOIBuffer Troubleshooting Guide ,264
Receiver Troubleshooting Guide ...... .266
........ Transmitter Troubleshooting Guide .268
Display Troubleshooting Guide .......... ,270
.......... Voltage and Continuity Checks ,274
Test Chart .................... .273
.......... Checking Transistors and Diodes ,274
INTRODUCTION
The table of "Contents" above shows the different types of
information that are available in this section to help you.
Begin your troubleshooting by localizing the trouble to a
specific area, as described below. Even if you are reasonably
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sure that you know the area your trouble is in, we suggest
that you read through "Locallzing the Trouble" because of
the additional information that
is given there.
Because
it is tied in very closely with this part of the
Manual, you will often be referred to the "Maintenance"
section (see Page 275) in the following pages. The
"Maintenance" section has complete information on each
circuit board, including a "Troubleshooting Chart," an
"X-Ray View," a "Voltage Chart." a Schematic, and a
"Circuit Description." You may also want to refer to the
main Schematic for the entire Transceiver (fold-out from
Page 323) and to the "Chassis Photographs" (Page
321).
ASSISTANCE BY THE HEATH COMPANY
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If you are unable to solve a difficulty, refer to the
"Customer Service'' information inside the rear cover of
this
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Manual. Your Heathkit Warranty is inside the front cover.
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If you know that the trouble is on a specific circuit board,
you can save expense by sending only that circuit board for
repair to either the Heath factory or to one of the Heath
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Electronic Centers. See Circuit Board Service Policy on Page
281, which also contains the special Power Amplifier circuit
board warranty.
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REPLACEMENT PARTS
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If you need a replacement part, whether or not it is within
warranty period, refer to the "Parts Lists" and to the
"Customer Service" information inside the rear cover of this
Manual.