Model
8904A
lbble
5-1.
Post-Repair Tests, Adjustments,
and
Checks
Adjustments
Assembly
Repaired
A1
Keyboard Assembly
A2 Controller Assembly
A3 Output Assembly
A1
0 Output Assembly
(Option 002)
A4 Power Supply
Assembly
A5 Display Assembly
A6 High Power Output
Assembly
(Option 006)
~~~ ~ ~
~
Performance
Test,
Adjustment,
or
Check
Basic Functional Checks
Reinstall Options 001, 003, and
005
if
formerly in the instrument.
Basic Functional Checks
Performance Test
1
-
Frequency Accuracy
Adjustment 6
-
Display Backlighting and Contrast
Adjustment
7
-
Phase Synchronization (Option
005)
Basic Functional Checks
Performance Test
2
-
AC and DC Amplitude Accuracy (Except Output 1 with Option 006)
Performance Test 3
-
AC Amplitude Flatness (Except Output
1
with Option 006)
Performance Test 4
-
AC Amplitude Accuracy and Flatness (Output
1
with Option 006)
Performance Test
5
-
Spectral Purity (Except Output
1
with Option 006)
Performance Test
6
-
Spectral Purity (Output
1
with Option 006)
Performance Test
7
-
Phase Accuracy (Using an Oscilloscope)
Performance Test
8
-
Phase Accuracy (Using a Time Interval Counter)
Performance Test
9
-
Channel-to-Channel Phase Accuracy (Option 001)
Performance Test 10
-
Output
1
-to-Output
2
Phase Accuracy (Option 002)
Performance Test
11
-
Unit-to-Unit Phase Accuracy (Option
005)
Performance Test 12
-
Tone Sequence Timing Accuracy (Option 001)
Performance Test 13
-
DTMF Sequence Timing Accuracy (Option
001)
Performance Test 14
-
Digital Sequence Period Accuracy (Option 001)
Adjustment
1
-
Output Gain and Offset
Adjustment 2
-
Output Balance
Adjustment
3
-
Output Gain (Option 006)
Adjustment 4
-
Sharp
Cutoff Low-Pass Filter
Adjustment 5
-
Sine
X/X
Compensation
Basic Functional Checks
Performance Test
5
-
Spectral Purity (Except Output
1
with Option 006)
Performance Test
6
-
Spectral Purity (Output
1
with Option 006)
Basic Functional Checks
Adjustment 6
-
Display Backlighting and Contrast
Basic Functional Checks
Performance Test 4
-
AC Amplitude Accuracy and Flatness (Output 1 with Option 006)
Adjustment 3
-
Output Gain (Option 006)
5-3
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