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         Service Bulletin 

 

 

Service bulletin # HK2004-003 

 

 

 

 

 

                                 

 

 

 

  

To: 

 

Harman Kardon Service Centers 

 

   Models: 

DVD31/230 

 
Subject: 

Circuit modification / can’t read disc.  

 
In the event you receive any DVD31/230 for service, please check if the below modification is done; if not, please 
do the following modification.   
 
All units with the below mentioned serial number must have the modification applied, even in case the DVD player came in 
for a different repair.  
 

1.  Remove the eight plated screws holding the top cover to the unit; remove the top cover 
2.  Locate Q109 and Q110 on the main board (see picture below) 
3.  Power on the unit, load a disc and press play  
4.  Measure Q110: if you do NOT measure 5V (4.9V) on Q110 collector (HFM), exchange Q109.  
5.  In any case, exchange Q110 to DTA114EKA 
6.  Remove R149  
7.  Power the unit on and test if there is 5V (4.9V) on Q110 collector (HFM) in play mode.   
8.  Test the unit for general functionality. 

 
Q109, 8050 (Y1)………..  ……….. Part number: 121-00008050-T000 
Q110, New DTA114EKA………… Part number: 121-DTA114EK-A400 
 
 
Org circuit 
 
 
 
 
 
 
 
 
 
 
 
 
 
New circuit after modification 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

         Service Bulletin 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Model # 

Serial Number of Change 

Status  

Action  

WA0010-01001~06015 

Q109 may fail  

see above service bulletin 
please note some units are 
already modified by Harman  

DVD31/230 

From WA0010-06016 

modified in production 

None required 

WA0009-01001~02500 
(implemented in Harman US) 

Q109 may fail  

None required 

DVD31/120 (including 
DVD31CP) 

From WA0009-02501 

modified in production 

None required 

 

HFM, Q110 collector 

S4

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