S E R V I C E N O T E
SUPERSEDES: None
8904A Multifunction Synthesizer (Option 006/H16)
Serial Numbers: 2948A04593 / 2948A04693
Replacement of Audio Transformer to Correct Inverted Waveform
Parts Required:
Situation:
Some 8904A Multifunction Synthesizer (Option 006/H16) with serial numbers listed above may have inverted OUTPUT 1 waveforms. This is because the primary of Audio Transformer T1 was wound backwards, resulting in a 180 degree phase shift from the pri- mary to the secondary. OUTPUT 2 waveforms are not affected.
The most noticeable waveform is the ramp because it is asymmetrical. Sinewave, square and triangle waveforms are inverted but are less noticeable because they are symmetrical. Normally the ramp waveform starts at the negative peak and ramps up to the positive peak. Suspect units will exhibit an inverted ramp waveform, i.e., the ramp starts at posi- tive peak and ramps down to the negative peak.
NOTE: Option 006/H16 is not indicated on the front panel LCD display when ann instru- ment preset is performed. Verify if Option 006/H16 is installed by inspecting the option labelon the rear panel of the unit.
Continued
DATE: 01 January 1992
ADMINISTRATIVE INFORMATION
SERVICE NOTE CLASSIFICATION:
MODIFICATION RECOMMENDED
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| ON SPECIFIED FAILURE |
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| LABOR: 1.0 Hours |
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LOCATION |
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| CUSTOMER INSTALLABLE | SERVICE |
| RETURN |
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| RETURN |
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| SERVICE CENTER |
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| SEE TEXT |
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AVAILABILITY: | PRODUCT’S SUPPORT LIFE | RESPONSIBLE UNTIL: 1000 |
| UNTIL: 01 January 1997 | ||||||
AUTHOR: LHL | ENTITY: 1000 |
ADDITIONAL INFORMATION:
©1991 AGILENT TECHNOLOGIES PRINTED IN U.S.A.
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