Output At Aux Sync Out Distorted Or Missing; Loop Will Not Oscillate; Abnormal Waveforms At Aux Out - Wavetek 193 Instruction Manual

6-21
Figure 6·23. Distorted or Missing Waveforms at AUX OUT
CHECK MODE
SWITCH (SWEEP/
MOD BOARD)
SW3·D
REFER TO
AUXILIARY
OUTPUT
AMPLIFIER
6.6.9
YES
CHECK FUNCTION
SWITCH (SWEEP/
MOD BOARD)
SW2·A
REFER TO
LOOP WILL
NOT
OSCILLATE
6.5.4
NO
SWEEP/MOD BOARD
6.5.5 Abnormal Waveforms At AUX OUT
1. Abnormal square wave, sine and triangle normal:
If a ± 2.8V square wave is present at the cathode
of CR4, check function switch (Sweep/Mode
board) SW2-A.
If not, refer to paragraph 6.6.3.
2. Abnormal sine wave, square and triangle normal:
If a ± 2.5V sine wave is present at U6 pin 6, check
the function switch (Sweep/Mod board) SW2-A.
If not, refer to paragraph 6.6.5.
3. Abnormal triangle, square and sine normal:
Check function switch (Sweep/Mod board) SW2-A.
6.5.4 Loop Will Not Oscillate
Improperly set controls:
1. AUX GEN frequency set too low.
2. AUX GEN MODE incorrectly set to SET FREQ or
SET WIDTH.
Functional block isolation:
If the loop still does not oscillate, refer to figure 6-24.
6.5.3 Output At AUX SYNC OUT Distorted or
Missing
Improperly set controls:
1. AUX GEN frequency too low.
2. AUX GEN MODE incorrectly set to SET FREQ or
SET WIDTH.
Functional block isolation:
If a ± 3.0V square wave is at U13 pin 2, refer to para-
graph 6.6.4; if not, refer to paragraph 6.5.4.
6.5.2 All Waveforms At AUX OUT Distorted or
Missing
Improperly set controls:
1. AUX GEN frequency set too low.
2. AUX GEN MODE must be set to FM, SWEEP,AM,
or AUX OUT ONLY.
3. WIDTH/dF/dM must not be fully ccw.
Functional block isolation:
If all waveforms at AUX OUT remains distorted or
missing, refer to figure 6-23.