Harman Kardon DVD 22, Руководство по обслуживанию, Страница: 20 / 61

harman/kardon
Service Bulletin
Service bulletin # HK2005-02 January 2005 Warranty labor rate: MINOR repair
To: All harman/kardon Service Centers
Model: DVD22
Subject: Will Not Read Disc
In the event you receive a DVD22 with the complaint: “the unit will not read a disc,” perform the
following modification. This procedure should be followed for every unit that has to be serviced, for
any reason (after checking serial number range below).
Synopsis: Replace one or possibly two SMD transistors.
1) Remove the eight plated screws holding the top cover to the unit; remove the top cover
2) Locate Q711 and Q712 near the edge of the MAIN PCB (see image below).
3) Power on the unit, load a disc and press play.
4) Measure Q712: if you do
NOT
measure approx. +4.9V on Q712 collector, exchange Q711 (9014) with
h/k part# 121-00009014-T000.
5) Either way: Replace Q712 (8550) with DTA114EKA SMD transistor, h/k part# 121-DTA114EK-A400.
6) Remove and discard R752.
7) Replace the cover and test the unit for general functionality.
MODEL
SERIAL NUMBER
STATUS ACTION
DVD22 (120v)
WA0007-01001
to
WA0007-18461
Q712 may overheat and fail,
affecting Q711
Replace Q712, Remove R752,
Replace Q711 only if defective
DVD22 (120v)
WA0009-18462 and above Modified by Factory None Required
20
DVD22 harman/kardon