Wavetek 143 - Page 37

5
1C2-8 MOMENTARILY.
CONTINUED GOES LOW WHEN, NO CHECK
FROM MAN TRIG IS C28, 1C2, IC3
PREVIOUS PAGE DEPRESSED SW1-A δι SW1-B
?
GO TO GATE MODE
TRIG/PULSE BOARD
GENERATOR BOARD
BASE OF Q27 GOES
ROM HIGH TO LOW NO CHECK
WHEN MAN TRIG PNA WIRING
IS DEPRESSED
Ys
BOS
GENERATOR RUNS ONLY GENERATOR RUNS GENERATOR
GOTO
WHEN MAN TRIG CONTINUOUSLY DOES NOT ОПЕ МОРЕ
IS DEPRESSED ? RUN
22
EN,
C71,CR18-CR26, TRIGGERS OK;
N
Q13, 024, 026 & erg WAVEFORM
TRIG AMPL OK CORRECT & BASE.
2 LINE BAD
APPROX —0.7V
AT R172 & R173
APPROX +1.5V
AT R172 & R173
CHECK START/STOP
IC2 ON TRIG/ 0° CAL > 100 mv
PULSE BOARD BETWEEN 2.0 & 0
CR18 - CR26,
013, 026 δι 027
OK
CR18 - CR25
Q13 & Q26, Q27
OK?
START/STOP
ONTROL шу»
WORK PROPERLY
?
CHECK
R2, CR26* & TRIG
COMPENSATION
CIRCUIT 1С6 & 07
GROUND
JUNCTION
07 8 R168
GROUND
JUNCTION
Q7 & R168
CHECK TRIGGER
COMPENSATION
CIRCUIT IC6 & Q7
APPROX OV
АТ R172 & R173
CHECK
CONTROL
APPROX +2.2V
AT R172 & R173
CHECK TRIGGER
AMPLIFIER
028 - 032
“MATCHED DIODE PAIR
Figure 6-5. Trigger and Gate Mode Checks, Trig/Pulse Board (Page 2 of 2)
6-7