Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent HP 8904A Service Notes 1

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                                                                                  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:

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