HFP0437_©_.PDF part of Sony (Bulletin) D-311 HFP0437_©_.PDF, Confidential Service bulletin hi-Fi product - 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) text manual preview

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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
charge Kit

Date: May 2, 1995

Symptom: (**) Solution:

Battery is not able to operate unit for more than two hours even though battery was fully charged (charged for more than 4 hours) Replace Resistor R424 in the Charge Detection circuit with the Charge Bd. Mount kit and perform the following modification procedure. REF FORMER DESCRIPTION R424 CHIP RESISTOR 100 KOHMS PART NUMBER 1-216-845-11 NEW DESCRIPTION CHARGE BD A. MOUNT KIT PART NUMBER X-4945-506-1

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 Autoflagged - NO
PRINTED ON RECYCLED PAPER

PRINTED IN USA

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.)