Wavetek 145 Instruction Manual page 46

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TRIG/PULSE BOARD
GENERATOR BOARD
~
IC2-8 MOMENTARll Y
GOES LOW WHEN NO
MAN TRIG IS
DEPRESSED
YES
GO TO GATE MODE
BASE OF 027 GOES
JROM HIGH TO LOW
<.,__
WHEN MAN TRIG
IS DEPRESSED
GENERATORRUNSO LY
<
WHEN MAN TRIG
IS DEPRESSED
~
f:s
C71 CR18 - CR26 TRIGGERS OK;
<
013 024 026 &'~O/TRIG WAVEFORM>
TRIG A~PL OK ~CORRECT & BASE-
? LINE BAD
YES
CHECK
IC2 ON TRIG/
PULSE BOARD
J E S
BETWEEN 2.0 &
.av
START/STOP
Y r S 0° CAL> 100 mV '-.....
~ - - - - - ~ ON DIAL
~~
J:o
CHECK
R2, CR26
4
& TRI
COMPENSATION
CIRCUIT IC6 & 07
*MATCHED DIODE PAIR
START/STOP
.,.,£ONTROL DOESN'T->
'-..WORK PROPERLY
CHECK
CONTROL
CHECK
C28, IC2, IC3
SW1 -A & SW1 -8
CHECK
P1-4 WIRING
GROUND
JUNCTION
07 & R168
NO
GENERATOR
DOES NOT
RUN
CHECK
CR26
CHECK TRIGGER
COMPENSATION
CIRCUIT IC6 & 07
GOTO
CONT MODE
GROUND
JUNCTION
07 & R168
CHECK TRIGGER
AMPLIFIER
028 - 032
Figure 6-5. Trigger and Gate Mode Checks, Trig/Pulse Board (Page 2 of 2)
6-11