Fisher MC 3000 Service Manual

Page 1

SERVICE MANUAL

FISHER
MC-3000

INTEGRATED MUSIC SYSTEM
STEREO RECEIVER

WORLD LEADER /N H/GH DUAL/TY STEREO

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SPECIFICATIONS

FM TUNER SECTION

Usable Sensitivity (IHF Standard)

SuV

Harmonic Distortion (at 400 Hz, 100% Modulation)

Mono 1.0%
Stereo 1.5%
Signal-to-Noise Ratio (at 100% Modulation &

ImV Input) GOdB
Selectivity 36dB
Image Frequency Rejection (at 88 MHz) 40dB
IF Frequency Rejection (at 88 MHz) 70dB
FM Stereo Separation (at 1 KHz) 30dB
Capture Ratio. (HF, at 1mV SdB
AM TUNER SECTION
Usable Sensitivity (lHF Standard) S/N 20dB

Loop Antenna 250uV/rn
Selectivity (at 1 MHz & :10 KHZ) 30dB
Image Frequency Rejection (at 1 MHz) 50dB
lF Frequency Rejection (at 1 MHz) 40dB
POWER AMPLIFIER SECTION
Minimum continuous FiMS sine wave power per
channel from 60 to 15,000Hz with less than 1%
total harmonic distortion into an 8 ohm load 7 watts

Sensitivities (for rated output power at 8 ohms,

1 KHz)/Impedances

DIAL CORD STRINGING

8 TRACK TAPE DECK ADJUSTMENT

2.5mV/50K ohm
300mV/1 M ohm
200mV/100K ohm

Phono (Magnetic)
Phono (Ceramic)
Auxiliary

Hum & Noise (below rated output)

Phono (Magnetic) 62dB

Phono (Ceramic) 62dB

Auxiliary 62dB
Frequency Response :2.0dB 4O - 15,000 Hz
Bass Control Range (at 100 Hz) tSdB
Treble Control Range (at 10 KHZ) :BdB

Loudness Contour (at 40dB volume attenuation

fixed)

+8dB at 100 Hz
+5dB at 10 KHz

TAPE SECTION

Tape Speed 3.75 ips
Wow and Flutter, maximum 02%
Signaleto~Noise Ratio 40GB
Channel Separation 35dB
Crosstalk 45dB
Distortion 2.0%
GENERAL
AC Power 120V
Frequency 50/60 HZ
Consumption 65 Watts
Dimensions (including control panel, cabinet) 1845/16" (W)
5-9/16" (H)
12-25/32" (D)

PUL Er

1. Recommended Test Equipment

a.
b.

Two Vacuum Tube Volt Meters
Test tapes RCA-321, Pony-806, or Victor-801
(Track 1 and 3 with (Hz and track 6 with 8kHz test signals)

2. Head Height Adjustment

3.
b.

Use test Cartridge tape (RCA-321 or Pony806).

Push program selector button to position tapehead to track 2
(on channel 2).

Connect two Vacuum Tube Volt Meters to left and right
channels.

Turn the head height adjust screw slowly counterclockwise or
clockwise and adiust for a null. For correct tapehead position,
make sure there is a peak on either side of the null at the point
where the output is minimum. Glyptol screw after correct
positioning is attained.

6.

Switch to channel 4 and back to 2 again, make sure that the
output on channel 2 is at minimum. Should the output on
channel 2 be greater than on channel 4, repeat adiustments.

3. Azimuth Adjustment

a.
b.
c.

Use test tape cartridge RCA-321.

Set tape player to track 2.

Connect two Vacuum Tube Volt Meters to the left and right
output channels.

, Adjust screw (A) with Phillips screwdriver for a balance at

maximum output.
Glyptol adjust screw after correct positioning is attained.