Wavetek 143 - Page 35

GENERATOR OUTPUT
DISTORTED, CLIPPED, OFFSET,
PLACE ATTENUA-
TION VERNIER
CCW, DC OFFSET
OFF & ALL OTHER
CONTROLS IN INI-
TIAL* POSITIONS
Ρ1-9 +24 Vdc
Р1-8 --24 Уас NO
L P1-7 —15 Мас — У
P16 +15 Мас
Ў
СНЕСК
FUNCTION
SELECTOR
CIRCUIT
GOOD AT TP2,
BAD AT TP3
ALL FUNCTIONS
GOOD AT WIPER
< SW4-C (WHT/ORN
WIRE) WHEN SW4
ROTATED ?
YES
REMOVE
WHT/ORN WIRE
STILL BAD
?
ALL FUNCTIONS
GOOD AT JUNCTION
R271 & R185 WHEN
SW4 ROTATED
?
CHECK
PREAMP CIRCUIT
TURN ATTEN
VERNIER CW
OUTPUT AMPLIFIER!
CHECK
OUTPUT ATTEN,
FUNCTION OUT
ALL FUNCTIONS
YES „соор AT JUNCTION
BNC WIRING, EX- ans
end ? *SYMMETRY TO OFF, FREQ VERNIER TO CAL,
DIAL TO 2.0, ALL OTHERS TO 12 O'CLOCK
Figure 6-4. Generator Output Checks, Generator Board
6-5