Agilent Technologies Electronic Keyboard 8904A User Manual

8904A-04  
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:  
9100-4833, Audio Transformer  
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  
IMMEDIATELY  
ACTION  
CATEGORY:  
STANDARDS:  
ON SPECIFIED FAILURE  
AGREEABLE TIME  
LABOR: 1.0 Hours  
SERVICE  
INVENTORY:  
USED  
PARTS:  
LOCATION  
CATEGORY:  
RETURN  
SCRAP  
RETURN  
SCRAP  
CUSTOMER INSTALLABLE  
ON-SITE  
SEE TEXT  
SEE TEXT  
SERVICE CENTER  
RESPONSIBLE UNTIL: 1000  
UNTIL: 01 January 1997  
PRODUCT’S SUPPORT LIFE  
AVAILABILITY:  
AUTHOR: LHL  
ADDITIONAL INFORMATION:  
ENTITY: 1000  
© 1991 AGILENT TECHNOLOGIES  
PRINTED IN U.S.A.  
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