Waveform Symmetry Out Of Specification; Incorrect Frequencies; Loop Oscillates In Aux Gen Off Mode; Aux Vcg Input Has No Effect - Wavetek 193 Instruction Manual

6-22
Figure 6·25. Loop Oscillates in AUX GEN OFF Mode
CHECK
CR13
CHECK
U1
YES
CHECK MODE
SWITCH (SWEEPI
MODE BOARD)
SW3-C
CHECK
U10
NO
SWEEP/MOD BOARD
6.5.9 AUX VCG Input Has No Effect
Functional block isolation:
If the sweep/mod generator frequencies are correct
6.5.8 Loop Oscillates in AUX GEN OFF MODE
Improperly set controls:
AUX GEN MODE switch not set to AUX GEN OFF.
Functional block isolation:
If the Sweep/Mod generator continues to oscillate,
refer to figure 6-25.
6.5.7 Incorrect Frequencies
Improperly set controls:
1. AUX GEN FUNC switch incorrectly set to n_or
/'1 .
2. Signal incorrectly connected to AUX VCG input.
3. WIDTH/dF/dM incorrectly set full ccw.
Functional block isolation:
If the frequencies are still incorrect, refer to table 6-18.
6.5.6 Waveform Symmetry Out of Specification
Improperly set controls:
1. AUX GEN FUNC switch incorrectly set to rL-or
,/'l .
2. Signal incorrectly connected to AUX VCG input.
Functional block isolation:
1. Verify OV across R19. If not, check AUX GEN
FUNC switch SW2-C.
2. Refer to paragraph 6.6.1, especially U1 and U2.
.113and 100l3K
range only
C5 and SW1-A 31100and .113
ranges only
C6 and SW1-A
Inoperative Range Check
R46, R47 and SW1-8
3KI100K and 100l3K
ranges only
Table 6·17. Oscillator Range Check