JVC 4VR-5446X/56 User Manual

No. 2338
SERVICE MANUAL
Mod. 4VR-5446X /56
FM/AM 4 - CHANNEL STEREO RECEIVER
WITH CD
- 4 DEMODULATOR
DIMENSIONS : H - 6-318" W - 20" D - 15-318" Weight : 27.8 1bs
(16.4cm) (50.8cm) (39.lcm) (15.8 kg)
AMPLIFIER SECTION
RMS Power
All channels driven,
20Hz-20kHz
power bandwidth
RMS Power
All channels driven,
at
I kHz
Total Dynamic Power
(IHF) :
IHF Power Bandwidth
Total Harmonic Distortion
:
Intermodulation Distortion :
Load l mpedance
Damping Factor
Input Sensitivity,
Impedance and
SIN Ratio :
Recording Output Level :
Frequency Response
SEA Center Frequency
21W per channel at 8n
(Front)
23W per channel at 4n
SEA Control Range
(Front)
55W per channel at 8n (BTL)
Bass Control (Rear)
104W (26W x 4) at 8n Treble Control (Rear) :
120W (30W x 4) at 4n Loudness Control
120W (60W x 2) at 8n (BTL)
172W (43W
x 4) at 8n
Low Cut Filter
200W (50W x 4) at 4n
High Cut Filter
10Hz- 30kHz Crosstalk
0.5% at rated output
FM TUNER SECTION
0.1% at half rated output
Tuning Range
0.8% at rated output
Usable Sensitivity
0.2% at half rated output
Total Harmonic Distortion :
4n - 16n
(at 400Hz, 100% Mod)
(8n - 160 : for BTL, System 1+2)
30 at 8n
Signal to Noise Ratio
Selectivity
Phono (High)
1.5mV/lOOkn, 65dB Capture ti^
Phono (L OW )
3.0mV/100kn, 70dB ti^^ Level
AUX-1, - 2
200mV/50kn7 75dB MW TUNER SECTION
Tape Mon.-1, - 2 200mV/50kS2, 75dB Tuning Range
FM 4ch Input 200mV/50kn, 75dB Usable Sensitivity
200mV
Selectivity
10Hz-SOkHz, +ldB
40, 250, lk, 5k, 15kHz
88MHz to 108MHz
2.0pV (IHF)
MONO 0.5%
STEREO 0.8%
65dB
65dB
2.0dB
l0pV

JVC 4VR-5446X/56 Specifications

General

Input sensitivity (MM)	2.5mV
Input sensitivity (line)	150mV
Signal to noise ratio (MM)	70dB
Output (line)	150mV
Power output (quadraphonic)	20W per channel (8 ohms, 20Hz-20kHz, 0.8% THD)
Frequency response	20Hz to 20kHz
Total harmonic distortion	0.8%
Speaker load impedance	4-16 ohms

Summary

SPECIFICATIONS

AMPLIFIER SECTION

Electrical specifications for the audio amplification stage.

FM TUNER SECTION

Performance data for the FM reception circuitry.

MW TUNER SECTION

Performance data for the AM reception circuitry.

REMOVAL OF THE TOP COVER AND BOTTOM PLATE

FINAL PACKING ASS'Y

MAIN PARTS ARRANGEMENT

HOW TO FIT THE DIAL CORD

POWER TRANS. VOLTAGE & WIRE COLOR

REMOVAL OF THE POWER AMPLIFIER CIRCUIT BOARD ASS'Y

HOW TO REPAIR & CHECK THE TUNER CIRCUIT BOARD ASS'Y & CD-4 DEMODULATOR CIRCUIT BOARD ASS'Y

REPLACEMENT OF POWER TRANSISTOR

TRANSISTOR LEADS

Diagrams illustrating the pin configurations of various transistors.

TUNER ALIGNMENT

BEFORE ALIGNMENT

Preparatory steps and conditions required prior to tuner alignment.

ADJUSTING IF STAGE

ADJUSTING TRACKING & SENSITIVITY

LOW FREQUENCY

Adjustment steps for tracking and sensitivity at lower broadcast frequencies.

HIGH FREQUENCY

Adjustment steps for tracking and sensitivity at higher broadcast frequencies.

FM ALIGNMENT

ADJUSTING DISCRIMINATOR

FM alignment procedure focusing on the discriminator circuit.

ADJUSTING CENTER METER & DISTORTION

FM alignment procedure for the center tuning meter and distortion.

AUDIO ALIGNMENT

ADJUSTING IDLING CURRENT

Procedure for setting quiescent current for audio output transistors.

ADJUSTING WITH MILIVOLT METER

Method for measuring audio stage bias using a millivoltmeter.

ADJUSTING PROTECTION CIRCUIT

CD-4 ADJUSTMENT

30kHz LEVEL ADJUSTMENT

Adjusting the 30kHz sub-channel carrier level for optimal CD-4 signal reproduction.

SEPARATION ADJUSTMENT

Calibrating channel separation for CD-4 playback.

THE LIST OF FRONT PANEL PARTS FOR REPLACEMENT

EXPLODED VIEW OF FRONT PANEL PARTS

EXPLODED VIEW OF REAR PANEL PARTS

THE LIST OF REAR PANEL PARTS FOR REPLACEMENT

TAP-203 (POWER SUPPLY C.B. ASS'Y)

TAP-237 (PROTECTOR C. B. ASS'Y)

TAC-302B (SELECT SWITCH C. B. ASS'Y)

TAD-152 (POWER AMP. C.B. ASS'Y)

TAC-361 (TONE CONTROL C. B. ASS'Y)

TAC-361 (TONE CONTROL C. B. ASS'Y) PARTS LIST

TAC-303B (SEA CONTROL C. B. ASS'Y)

TAC-306D (LAMP C. B. ASS'Y)

TDM-22A (CD-4 DEMODULATOR C. B. ASS'Y)

TDM-22A (CD-4 DEMODULATOR C. B. ASS'Y) PARTS LIST

TFM-207GUA2 (TUNER C. B. ASS'Y)

TFM-207GUA2 (TUNER C. B. ASS'Y) PARTS LIST

TFM-207GUA5 (TUNER C.B. ASS'Y) PARTS LIST

CHECK POINT AFTER REPAIR

ACCESSORY