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Service bulletin #  9705   August 1997

Warranty labor rate: MAJOR repair

To:

All harman/kardon Service Centers

Models:  

AVR85

Subject:  

Modification

1)  

  Make sure the receiver is OFF and unplugged; remove the top cover of the unit.

 

2)  

 Position the unit on its side, facing it so you are looking at the bottom cover, with the front of the

receiver facing left.  The power transformer should be down, or nearest the work bench.
 

3)  

 Remove the front right “foot” of the unit; then with a sharp pair of dikes or wire cutters cut  the (16)

metal  connections on the bottom screen attaching it to the bottom cover.  Remove bottom screen from
unit; for safety continue to cut all the remaining severed metal tabs from the bottom cover.
 

4)  

 Locate and discharge main power supply electrolytic capacitors C802 & C803 with a 10 ohm, 10

watt resistor.  At this point, C802 & 803 are at the top of the main PCB; The two leads to C803 can be
identified by the marking “-B” on the PCB;  C802 is just above it.  After discharge, check with voltmeter
that capacitors have less than 1 volt DC across leads to confirm that discharge is complete.
 

5)  

 See drawing; locate two areas of a poor solder connection due to an unintended mask, or dark-

colored dot that is partially covering the solder pad(s) where the leads come through.  Unsolder the
connection(s) with solder wick.  Clean & scrape, if necessary, with a small screwdriver the foil/pad area
thoroughly and remove any excess mask residue.  Re-solder the connection(s) carefully to assure good
connections.
 

6)  

 Turn the unit upright;  locate  PCB P714, the small vertical circuit board nearest the main heatsink.

Unplug and remove small molex connector J701 at the top of the board; then remove the four mounting
screws and metal tabs holding the top of the board in place.
 

7)  

 Remove the two locks to the two sockets, J714 and J716.  Take care not to damage the lock or

connector while attempting to unlatch the PCB;  then unplug and remove the entire PCB P714.
 

8)  

 Locate 10 ohm, ¼ watt resistors RH23, RH24, R745, R746, R747, R748; test with multimeter to

assure they are still 10 ohms +/- 5%.  If values are different (indicating damage), replace as necessary.
 

9)  

 Return PCB P714 to unit; re-attach molex connector; replace 4 screws and mounting tabs.  Replace

top cover of receiver.
 

10)  

 Re-attach the bottom screen to the bottom cover using 12 screws, (H/K# 51260306MO); the screen

will be upside-down compared to its former position when attached; replace the unit’s “foot”.
 

11)  

 TO TEST:

a)  

Plug in the unit; connect speakers to left, right, and center output terminals.

b)  

Turn the unit on; switch the unit to “Prologic” mode by use of the mode buttons on the front panel.

c)  

Press the button “TEST TONE” on the remote control.  The display should read “FRONT L” and

“TEST” should flash.

d)  

Adjust the master volume, and verify test noise is heard from front left channel.

e)  

Press the button “CH SELECT” on the remote control to change to the right and center speakers, and

verify test noise is heard from each one.

f)  

Press the button “TEST TONE” on the remote control again to exit the test.

AVR85

MJ0011-01001

to

MJ0011-02500

MJ0012-01001

to

MJ0012-01500

Poor connections in

two areas on main

PCB

Clean & re-solder

connections,

check or replace

RH23,RH24,R745.R746

R747, R748 if necessary

AVR85

MJ0011-02501

and above

MJ0011-01501

and above

Modified by factory

NONE REQUIRED

View is upper left-hand corner of PCB
  

 Bottom (trace) side