Bulletin Hk2001-04 - Harman Kardon CDR20 Service Manual

CDR20
harman/kardon
Service bulletin # H/K2001-04 October 2001
To: All harman/kardon Service Centers
Model: CDR20
Subject: Delay in Reading Blank Disc
In the event you receive a CDR20 CD Player/Recorder with the complaint: "The unit has an excessive
delay (over 45 seconds) when initially reading a blank CDR disc in the Record drawer, after it's
inserted", perform the modification below:
Synopsis: Add a 330 pf ceramic capacitor from pin #1 on IC413 Op-amp to Ground.
1) With the unit plugged in, turn it ON. Press the eject button on the Record side to open the drawer.
2) With the drawer fully extended, carefully lift up on the front trim to separate it, and off the main part of the
drawer. Press the eject buton again to close the drawer. Turn the unit OFF and unplug it.
3) Remove the (7) Phillips screws holding the top cover on; remove the top cover.
4) Unplug the three connectors at the rear of the Record PCB.
5) Unscrew the (4) black Phillips screws that are deep in the slotted wells in each corner of the Record
mechanism. Lift the entire Record assembly up and out of the unit.
6) Remove the gray metal shield from the assembly. Lay the assembly upside-down on a table, PCB facing
upwards.
7) The PCB can be disengaged from the assembly by depressing the two black plastic tabs on opposite sides of
the PCB and lifting, in sequence.
8) CAREFULLY lift the PCB off the assembly, noting the (4) connectors that are attached to the PCB. Unplug the
three ribbon connectors. (NOTE: the largest female connector on the PCB has a locking collar which must be
lifted to disengage the cable); the mustard-colored molex connector can remain in place, "hinge" the PCB open
enough to lay it flat on the table.
9) Locate the area of concern with the aid of the illustrations. Solder a 330pf ceramic capacitor,
(h/k part# 147-75-331) from electrical equivalent pin #1 on IC431 Op-amp to Ground.
10) Reassemble and replace the record mechanism in reverse order; test the unit by inserting a blank CDR disc in
the Record drawer and note the time delay.
Model Serial number
120V
LG0003-01001
to
CDR20
LG0003-27200
CDR20 LG0003-27201
Serial number
230V
LG0004-01001
May have long time delay when
to
reading a blank CDR disc
LG0004-07630
LG0004-07631
16
Service Bulletin
Warranty labor rate: MINOR repair
Status
Factory Installed
harman/kardon
Action
Add 330 pf capacitor from pin #1
on IC413 Op-amp to Ground
NONE REQUIRED