Bulletin Hk2003-10 - Harman Kardon AVR130 Service Manual

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AVR130
harman/kardon
Service bulletin # H/K2003-10 December 2003
To: All harman/kardon Service Centers
Models: AVR130, AVR230, AVR330, HK3380, HK3480
Subject: Volume Level Changes
On early versions of the AVR130,AVR230,AVR330,HK3380,HK3480, when the volume control is turned, the
volume level and display may be erratic, and not track accurately, or the level may progress in an unintended
direction. This may happen on a random basis and depends on where the volume control knob is positioned
after a volume adjustment. During a running production change, new volume encoders were installed.
In the event you receive an AVR model listed above with the complaint "The volume control on my
receiver does not track accurately when turned", perform the following procedure:
REPLACE VR74 (AVR130/230/330) or VR81 (HK3380/3480) VOLUME ENCODER
Note: It is important that the various screws do not get mixed up and inserted in other locations upon reassembly. Make
note or label each removed screw set; keep them apart from other screw sets.
1) Remove the top cover, (13) Phillips screws.
2) Remove the volume, bass, treble and balance knobs by pulling them straight out and off. If a tool is
necessary for removal of the smaller knobs, make sure the jaws are insulated to avoid knob damage.
3) Remove the (10) Phillips screws holding the front panel ass'y to the chassis: (6) at the bottom and (4) at
the sides.
4) Cut all plastic cable ties that would prevent you detaching the front panel ass'y from the chassis. Draw a
diagram if necessary, for a location reminder, to aid reassembly.
5) Unplug connector CN15 (6 cond) or CN89 (7 cond) at the left side of the unit. See below.
6) Remove single ground screw at the left side of the unit, near CN15 or CN89. (Black wire)
7) Unplug connector CN72 (32 cond) or CN81 (20 cond) on the DSP PCB, coming from the top of the front
panel ass'y. See below.
8) There should now be enough slack in the connecting cables to lift and detach the front panel ass'y from
the chassis. Pull the front panel as far away as the remaining connecting wires will allow, enough to tilt
and gain access to the rear of the Tone/Volume PCB. See illustration Page 2.
9) Remove the (10) screws or (9) screws holding the Tone/Volume PCB to the front panel.
10) Detach and pull back the PCB; unplug top connector CN84 (7 cond) or CN83 (4 cond) if necessary.
11) Remove and replace VR74 or VR81 (5 soldered pads) with hk part# HSR2A029Z.
12) Reassemble in reverse order, taking care to replace all connectors, cable ties, and ground screw.
13) Power up receiver, and test volume control to assure setting no longer changes settings by itself, or when
the volume knob is tapped.
Service Bulletin
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