Service Manuals, User Guides, Schematic Diagrams or docs for : Sony HiFi Service Bulletin HFP0437

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                                    Hi-Fi Products                                                 CSA-13
                                    Service Bulletin
                                    Sony Service Company - Technical Services
                                    A Division of Sony Electronics Inc.
                                    Sony Drive, Park Ridge, New Jersey 07656


Model:      D-311                                                           No.    437
Subject: Battery does not charge up all the way: Add the                    Date: May 2, 1995
            charge Kit


Symptom:
 (**)           Battery is not able to operate unit for more than two hours even though battery was
                fully charged (charged for more than 4 hours)

Solution:       Replace Resistor R424 in the Charge Detection circuit with the Charge Bd. Mount kit
                and perform the following modification procedure.

                     REF                   FORMER                                        NEW
                              DESCRIPTION          PART NUMBER               DESCRIPTION    PART NUMBER

                    R424          CHIP                1-216-845-11           CHARGE BD A.       X-4945-506-1
                              RESISTOR 100                                    MOUNT KIT
                                KOHMS



Procedure:       Set the variable resistor on the CHGA board counterclockwise, until the resistance
                 measured between the CHGA board's leads is at a minimum (about 10K).
                Remove R424 and solder the leads of the CHGA board in its place.




Reference: T/N #GA-94064                                                                           PRINTED IN USA
Autoflagged - NO
                                                PRINTED ON RECYCLED PAPER
Audio Products Service Bulletin No. 437


Adjustment: 1)Place a jumper between the collector -1 of Q411 and the emitter-2 of Q309.
                2) Apply between 3.95 to 3.98 VDC to the rechargeable battery terminals.
                3) Press the "STOP" button to make sure the unit is in the charge conditions.
                4) Monitor IC801/pin 69, it should be high. Turn the variable resistor clockwise on
                the CHGA bd until IC801/pin 69 goes low.
                5) Adjust the voltage at the battery terminals to 3.8V DC. Confirm that IC801/pin 69
                changes from low to high.
                6) Gradually increase the voltage insuring IC801/pin 69 goes from high to low when
                the voltage is again between 3.92 and 3.98 V
                7) Remove the jumper.
Audio Products Service Bulletin No. 437
Filename:             HFP0437.SB
Directory:            J:\SBDOC\MAY95
Template:             C:\WINWORD\TEMPLATE\S_BULL.DOT
Title:                battery doesn't charge
Subject:              d311
Author:               Hoyt Wing Lee
Keywords:
Comments:
Creation Date:        05/02/95 9:06 AM
Revision Number:      5
Last Saved On:        01/23/96 10:39 AM
Last Saved By:        Cesar Bechbache
Total Editing Time:   40 Minutes
Last Printed On:      04/01/96 9:55 AM
As of Last Complete Printing
    Number of Pages: 3
    Number of Words: 264 (approx.)
    Number of Characters:     1,506 (approx.)

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