Sony D-311 Reference manual

Model: D-311 No. 437
Subject: Battery does not charge up all the way: Add the
charge Kit Date: May 2, 1995
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
RESISTOR 100
KOHMS
1-216-845-11
CHARGE BD A.
MOUNT KIT
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.
CSA-13
Hi-Fi Products
Service Bulletin
Sony Service Company - Technical Services
A Division of Sony Electronics Inc.
Sony Drive, Park Ridge, New Jersey 07656
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.)