Sony HFP0437 free download

File name HFP0437.PDF

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/