Service Bulletin # H/K2003-05 - Harman Kardon AVR325 Service Manual

AVR325
harman/kardon
Service bulletin # H/K2003-05 Sept. 2003
To: All harman/kardon Service Centers
Model: AVR325/AVR525
Subject: Software Upgrade
A software upgrade is possible for the sub Micro CXP82852-375Q (IC12) in models AVR325 and AVR525;
units without the upgrade may exhibit the following symptoms:
1) Dolby Digital EX mode only, Delay adjustment, any speaker size selected: Adjusting the delay time at 14 feet or
greater for surround back, surround or center channels, may generate a distortion (like a feedback signal) from the
subwoofer output. Lowering the delay level below 14 feet eliminates the distortion.
2) The Triple Crossover feature: Settings allow a different crossover point to be used for the front left/right, center
and surround speakers. If the settings are not configured properly, the user could actually create a frequency notch
and "cut out" certain bass frequencies, or, over-enhance bass frequencies by overlapping the X-Over points.
(NOTE: It would be a rare occurrence where symptom #2 would generate a complaint)
AVR325 IC12, (CXP82852-375Q) order and replace with h/k part # 55646260 (CXP82860-390Q).
AVR525 IC12, (CXP82852-377Q) order and replace with h/k part # 55645960 (CXP82860-391Q).
WARNING: FOLLOW PROPER STATIC CONTROL PROCEDURES and use caution during the removal of
the DSP board, and during installation of new IC12 to prevent damage.
Sub Micro CXP82852-375Q (IC12) is on the DSP board. Remove top cover, Processor board, all Molex connectors
and rear screws necessary to access DSP board.
Disengage both Processor and DSP PCB from the
rear PCB connector by pushing back on the rear
board; lift the Processor PCB up and out of the unit.
Not all connectors need to be removed – when
enough connectors are unplugged, the Processor
PCB can be lifted out of the way to access the DSP
board.
Disengage the DSP PCB from its rear connector by
pushing back on the rear PCB; lift the DSP PCB up
and out of the unit.
Locate and replace IC12; See drawing.
After replacement, replace all connectors and
screws. CAUTION: At the rear screws, if using a
power tool, use care and minimum force to avoid
damaging the various plastic receptacles.
Test the unit.
Serial Number (120v)
Model
All Serial Numbers Affected
AVR325
All Serial Numbers Affected
AVR525
Service Bulletin
Warranty labor rate: MAJOR repair
Status
Dolby Digital Ex Mode Delay Adjustment
Oscillation; Triple Crossover
Dolby Digital Ex Mode Delay Adjustment
Oscillation; Triple Crossover
18
harman/kardon
Action
Change IC12
Change IC12