Agilent HP 8904A Service Notes 1 free download

File name HP 8904A Service Notes 1.pdf

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 ACTION IMMEDIATELY STANDARDS: CATEGORY: ON SPECIFIED FAILURE LABOR: 1.0 Hours AGREEABLE TIME LOCATION CUSTOMER INSTALLABLE SERVICE RETURN USED RETURN CATEGORY: ON-SITE INVENTORY: SCRAP PARTS: SCRAP SERVICE CENTER SEE TEXT SEE TEXT AVAILABILITY: PRODUCT'S SUPPORT LIFE RESPONSIBLE UNTIL: 1000 UNTIL: 01 January 1997 AUTHOR: LHL ENTITY: 1000 ADDITIONAL INFORMATION: