Heathkit SB-104 - Page 71

MAINTENANCE SECTION
INDEX
Pin-out Diagrams . . . . . . . . . . . . . . . . . . 276
ldentification Charts
. . . . . . . . . . . . . . . . 279
Circuit Board Service Policy
. . . . . . , . . . . . . 281
VFO and Buffer Circuit Boards
. . . . . . . . . . . . 283
Converter Circuit Board
. . . . . . . . . . . . . . . 286
Display Circuit Board . . . . . . . . . . . . . . . . 288
Counter Circuit Board
(Al . . . . . . . . . . . . . . 291
HFOIPremix Circuit Board (D) . . . . . . . . . . . 294
Transmitter
AudioIReg Circuit Board (B) . . . . . . . 296
Transmitter IF Circuit board
(C) . . . . . . . . . . . 298
Driver Circuit Board
(J) . . . . . . . . . . . . . . . 300
VFOIFilter Circuit Board . . . . . . . . . . . . . . 302
ALC/Output Circuit Board (K) . . . . . . . . . . . . 304
Carrier
GenIXtal Filter Circuit Board (E) . . . . . . . 306
Receiver Front End Circuit Board
(G) . . . . . . . . 308
Receiver
IFIAudio Circuit Board (F) . . . . . . . . . 310
P.A. Circuit
Board (H) . . . . . . . . . . . . . . . 312
This part of the Manual presents, for each circuit board, a
A.
Find the circuit component number (R5, Q2,
section which contains the Schematic diagram, an "X-Ray etc.) on the proper "X-Ray View" or the
View," a "Voltage Chart," a "Troubleshooting Chart," and a
Schematic.
"Circuit Description." The "X-Ray View" permits you to
simulate viewing both sides of the circuit board B. Locate this same number in the "Circuit
simultaneously so you can easily trace the foil
pattern Component Number"
column of the proper
between components. "Parts List."
The pin-out diagrams and Identification Charts provide a
C.
Adjacent to the circuit component number, you
summarlzed reference to all the solid-state devlces used in will find the Pan Number and Description,
the Transceiver. which must be supplied when
yw order a
replacement part.
To find the Part Number of a component for the
purpore of
ordering a replacement part: