Sony D-311 Reference manual

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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.)