Wavetek 143 - Page 33

GENERATOR LOOP
PLACE ALL CON-
TROLS IN INITIAL*
POSITIONS
+1.25V
2 kHz TRIANGLE
AT TP2
?
P1-9 +24 Vdc
Р1-8 —24 Vde NO
сс Р1-7 -15 Удс —>—
P1-6 +15 Vdc
+1.5 TO + 2.0 Vd
AT R172 & 81732
APPROX +10 Мас NO
АТ 06 EMITTERS
?
YES
VOLTAGE AT
WIPER SW1-F NO
< (GN WIRE) THE
SAME AS AT TP2
CHECK
TRIANGLE AMPL
08-012 CIRCUIT
YES
APPROX 2 Уас
AT COLLECTOR NO
< 015 & OPPOSITE
IN POLARITY TO
THAT АТ ΤΡ2 7
CHECK
HYSTERESIS
SWITCH IC9 δι
Q15 - Q17 CIRCUIT
YES
VOLTAGE AT
EMITTERS 013 & 014 NO CHECK
< THE SAME AS AT INTEGRATOR Q13
COLLECTOR Q15 & Q14 CIRCUITS
? & DIODES CR6 - CRY
ху
CR26
*SYMMETRY TO OFF, FREQ VERNIER TO CAL, DIAL TO 2.0, ALL OTHERS ТО
12 O'CLOCK
**A NEGATIVE VOLTAGE HERE STOPS GENERATOR FOR TRIGGERED OPERATION
***USE SCOPE AND HIGH IMPEDANCE PROBE
Figure 6-2. Generator Loop Checks, Generator Board