Wavetek 182A Instruction Manual page 27

Indication: Generator does not respond correctly to dial and VCG input.
1. Set controls to initial positions (refer to paragraph 6.4).
2. Check for approximately + 15V at E11.
Check for 0 ± 10 mV at U1 pin 13.
3.
4. Check U1 pin 14 for approximately - 5V.
5. Check that as the dial is rotated from 4.0 to .004, the voltage
at U 1 pin 14 varies from approximately - 5 to OV.
6. Ensure that U 1 pin 5 remains at a constant OV ± 40 mV as the
dial is varied.
7. Check that, as the dial is rotated from .004 to 4.0, the vo�tage
at U1 pin 1 does not saturate near -15V or + 15V (typical range is
+
between - 10V and 10V) and stops varing with the dial.
8. Check that as the dial is rotated from .004 to 4.0, U6 pin 8 varies from
approximately - 15V to - 10V.
9 Check that, as the dial is rotated from .004 to 4.0, the voltage at
U 1 pin 7 does not saturate near + 15V or - 15V (typical range is between
+ 10V and - 10V) and stops varying with the dial.
10 Check that, as the dial is rotated from .004 to 4.0, U4 pin 13 varies from
approximately + 15V to + 10V.
11. Check for nonlinearity in the ± 1.25V triangle at the emitter of 011 near
the bottom of the x 1 K through x 1
12. Check frequencies of x 1 K, x 10K and 100K ranges.
13. Check frequency and linearity of x 1
14. Check frequencies of x 1, X 10 and x 100 ranges.
Table 6·7. VCG Circuit
Check
M ranges.
M
range.
If Faulty, Check
Check for normal operation.
a. E10, E11 and E12 wiring.
b. + 15V supply.
c. Dial potentiometer.
U1.
U1.
U1.
U1, U4, and U6 circuits.
06, U1, and U6 circuits.
U6, U1, and 06 circuits.
U4 and U1 circuits.
U4 and U1 circuits.
a. Associated timing
capacitors or C36.
b. U5, CR6.
c. 09, 010.
a. Adjust R19.
b. C30, 31 and 32
(trimmed by C33).
a. C34.
b. C36.
c. C18, 19, 20 and 21.
R86 and table 6·9.
6 -5