Harman/kardon

harman/kardon	Service Bulletin
Service bulletin # 9604 rev1 - October 1998	This is considered a 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.

In the event you receive a FL8300 from a consumer with the a complaint “Intermittent Sound from External D/A converter”, check the serial number in the table below.

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 to a 4.7k 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.

Model	Serial number	Serial number	Status	Action
	120V	230V
FL8300	IN0019-01001	IN0020-01001	May have low digital	Replace R901 with 0.47 uf mylar
	to	to	output for some	capacitor h/k part# 5354-474593
	IN0019-19393	IN0020-04500	applications	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 10% peak to peak.

FL8300 specifications

The Harman-Kardon FL8300 is a sophisticated, high-performance audio component that exemplifies the integration of advanced technology and premium audio engineering. Designed for audiophiles and music enthusiasts, this device offers an array of features that elevate the listening experience.

One of the standout characteristics of the FL8300 is its aesthetic design, which combines elegance and functionality. The device is housed in a sleek, modern casing that not only looks great but also maximizes sound quality. Its minimalist style enables it to blend seamlessly into any home entertainment setup while showcasing Harman-Kardon’s commitment to quality and design.

At the heart of the FL8300 is its advanced digital signal processing technology, which ensures optimal sound reproduction across various media formats. This technology allows for precise adjustments to sound output, balancing treble, midrange, and bass frequencies for an immersive listening experience. The result is vibrant sound that brings music and movies to life, regardless of the genre or source.

Additionally, the FL8300 supports a range of input options, making it incredibly versatile and compatible with various devices. It features multiple analog and digital inputs, including USB, optical, and coaxial connections, enabling users to connect their favorite audio sources effortlessly. This flexibility is crucial for today’s multimedia environments, where users often switch between devices.

Moreover, the Harman-Kardon FL8300 incorporates high-quality components such as audiophile-grade capacitors and amplifiers, which contribute to its rich and dynamic sound performance. With an emphasis on clarity and detail, this audio component ensures that every note is reproduced with accuracy and depth.

The FL8300 also offers user-friendly controls and customizable settings for a tailored audio experience. Its intuitive interface allows users to adjust settings easily, such as equalization and volume levels, ensuring that each listener can create their ideal sound environment.

In conclusion, the Harman-Kardon FL8300 stands out as a premium audio component that combines cutting-edge technology, elegant design, and versatile functionality. With its superior sound quality, multiple input options, and user-friendly features, it is a reliable choice for those seeking an exceptional auditory experience. Whether for casual listening or high-fidelity audio enjoyment, the FL8300 promises to enhance any home entertainment system.

Service Bulletin

Model

Serial number

Status

Action

120V

230V

NONE REQUIRED

FL8300 specifications