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harman/kardon Incorporated          

           250 Crossways Park Dr.   Woodbury, New York   11797

Service bulletin # 9604 rev1 -  October 1998

Warranty labor rate: MINOR repair

To: All harman/kardon Service Centers

Models: FL8300

Subject: Digital Output Level

The Digital Interface Standard recommends D/A converters have a minimum Input sensitivity of 200 mV.
In early FL8300 production units, the Digital Output level was 240 mV 

±

10% peak to peak. Based on our research,

we found that some D/A converters require more than 240 mV for intermittent free operation.

If the FL8300 has a serial number higher than indicated in the table below, connect a properly working D/A
converter to the Digital Output and verify interruption free operation. Also confirm the Digital Output level of the
FL8300 is 500 mV 

±

10% Peak to Peak. If the FL8300 passes these two tests, advise the customer to have their

external D/A converter and connecting cables checked.

If the FL8300 has a serial number lower than indicated in the table below, perform the following
modification:

1)  With the unit plugged in and turned on, push the “open/close” button to extend the drawer fully; then turn the

unit off and unplug it.

2)  Open the top cover (6 screws).
3)  Remove output board PCB3 from the rear panel (4 screws).  This board can be pulled back and modified

without completely removing it from the chassis.

4)  Locate resistor R901, it may be a 680 ohm resistor or a jumper wire; replace in either case with a

0.47 uf capacitor h/k part# 5354-474593.

5)  Locate R903 and change from 680

Ω

 to a 4.7k

Ω

 resistor 

−

 h/k part # 3029472970.  Re-attach output PCB3 to

the unit.

6)  Connect a 75 Ohms cable to the digital output jack. Terminate this cable with a 75 Ohm load; connect an

oscilloscope to the 75 Ohm termination resistor.  While playing a CD, confirm the output of the signal is now
500 mV 

±

10% peak to peak.

7)  Reassemble the FL8300 and test all functions.

 

FL8300

IN0019-01001

to

IN0019-19393

IN0020-01001

to

IN0020-04500

May have low digital

output for some

applications

Replace R901 with 0.47 uf mylar

capacitor h/k part# 5354-474593

Replace R903 with 4.7k ohm resistor

h/k part# 3029472970

FL8300

IN0019-19394

IN0020-04501

Factory Installed *

NONE REQUIRED

*

 Factory modification of the FL8300 starting with the serial numbers indicated in the above table consisted of:

  R236: 1k Ohm
  R901: Jumper or 680 Ohm
  R903: Changed from 680 Ohm to 4.7k Ohm.
  Digital output level into 75 Ohms: 500 mV