Wavetek 180 - Page 19

GENERATOR LOOP CHECK
NO ±1.25V 'V
AT PIN 6 106
REGULATED
<+ & - 15 Vdc
AT TP2 & TP3
115/220V SWITCH
& POWER
CONNECTION '
OK ?
+24 Vdc
ON C2 (+)
8,^-24 Vdc
ON C1 (-)
YES
GO TO
POWER SUPPLY
REGULATOR
CHECK
DIODES
CRl -4
OK
YES
CHECK
XFMR
<
ROTATE DIAL
FROM TOP
TO BOTTOM;
+15V T0~15 mV
SHIFT AT E6
r
WIRING
E5 -7
OK
YES
DIAL
POTENTIO
METER
BAD
<
<
ROTATE DIAL;
0 Vdc WITH
NO SHIFT
AT PIN 3IC4
^ES
ROTATE DIAL;
APPROX -15V
TO lOV SHIFT AT
PINS7.4,2
& +15V TO +10V
SHIFT AT PINS
10,13 IC5 ?
^^ES
^±2 Vdc
ATJUNCTION
& --+1.25 Vdc*
AT JUNCTION
CR11.CR13 ?
PROBLEM
IN IC4
CIRCUIT
& PNP
AT PINS?
ICS OK
PROBLEM
IN ICS
CIRCUIT
CHECK 018 • 20
CR14, 15 & IC7
CIRCUIT
CR10- 13
& SW1 A, B,C
OK
SAME Vdc
AT PINS 3, 8 ICS
ICS
CIRCUIT
OK
+1.25 Vdc
AT PIN 8 ICS
CHECK GIB - 20,
CR14, 15 & IC7
CIRCUIT
YES
CHECK
CR14, 15
THE TOP OR BOTTOM OF THE SQUARE AND TRIANGLE
WAVEFORMS.WHICH INDICATES A LOCKED UP GENERATOR
Figure 6-1. Troubleshooting Chart (Sheet 2 of 4)
6-3