Jvc RX 630 RBK Service Manual

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RX-GSORBK

.JVB
SERVICEMANUAL

RX-63ORBK

Area Suffix
B ...................... U.K.
E ''''''''' Continental Europe
EN ............. North Europe
G .................. Germany

Contents
Safety Precautions ------------------------------------- 1-2,:3 Adjustment Procedures rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr 2.13
Instruction Book ---------------------------------------------- 1-4~31 Block Diagrams --------
Description of Major ICs »»»»» 2-1 Schematic Diagrams -
lnternal Connection of Display 2-9 Printed Circuit Boards
Main Layout .............................................. 2.10 Parts List .................
Disassembly Procedures ----------------------------------- 2-13
No.20641
COPYRIGHT © 1997 VICTOR COMPANY OF JAPAN, LTD.

Oct. 1 997

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http : / /getMANUAL . com

RX-63ORB 1

-Safety Precautions

1.This design of this product contains special hardware and many circuits and components specially
for safety purposes. For continued protection, no changes should be made to the original design
unless authorized in writing by the manufacturer. Replacement parts must be identical to those
used in the original circuits. Services should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of
the product should not be made. Any design alterations or additions will void the manufacturers
warranty and will further relieve the manufacture of responsibility for personal injury or property
damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics.
These characteristics are often not evident from visual inspection nor can the protection afforded
by them necessarily be obtained by using replacement components rated for higher voltage,
wattage, etc. Replacement parts which have these special safety characteristics are identified in
the Parts List of Service Manual. Electrical components having such features are identified by
shading on the schematics and by (lb) on the Parts List in the Service Manual. The use of a
substitute replacement which does not have the same safety characteristics as the recommended
replacement parts shown in the Parts List of Service Manual may create shock, fire, or other
hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the
like to be separated from live parts, high temperature parts, moving parts and/or sharp edges
for the prevention of electric shock and fire hazard. When service is required, the original lead
routing and dress should be observed, and it should be confirmed that they have been returned
to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing)
After re-assembling the product, always perform an isolation check on the exposed metal parts
of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control
shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

Do not use a line isolation transformer during this check.

0 Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure
the leakage current from each exposed metal parts of the cabinet, particularly any exposed
metal part having a return path to the chassis, to a known good earth ground. Any leakage
current must not exceed 0.5mA AC (r.m.s.)

0 Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms
per volt or more sensitivity in the following manner. Connect a 1,5009 10W resistor paralleled by
a 0.15uF AC-type capacitor between an exposed

AC VOLTMETER
metal part and a known good earth ground. (Having 1000
Measure the AC voltage across the resistor with the 7 ohms/volts,
AC voltmeter. or more sensitivity)
Move the resistor connection to eachexposed metal
part, particularly any exposed metal part having a 015,: AC TYPE
return path to the chassis, and meausre the AC _"_ Place this
voltage across the resistor. Now, reverse the plug in probe on
the AC outlet and repeat each measurement. voltage WV " = each exposed
measured Any must not exceed 0.75 V AC (r.m.s.). 15009 10W metal part.

This corresponds to 0.5 mA AC (r.m.s.).
Good earth ground

._ Warning

1.This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
3. Repairs must be made in accordance with the relevant safety standards.

4.lt is essential that safety critical components are replaced by approved parts.

5.If mains voltage selector is provided, check setting for local voltage.

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Page 30

RX-630RBK

I LA3401 (lCtO5): FM MPX Detector

1 . The main function descriptions
(1) Detect the FM Multiplex Signal ( Stereo signal).
(2) When receiving FM Stereo Signal, it outputs the signal for indicator.
(3) AM / FM Audio Amplifier.

2- Terminal Layout 3. Block Diagram maxim-1 rpm-i
mflfl Hwi
Rf! me 6
Vcc vco LPF LPF .'" LPF LPF in (mt sre, sun
Min 1 27 V66 I_____J1.Z _? _ au_[[:] _[E _E 5 _[§LJE|___JEE_I
w in 2 21 vco I
Pilot 3 20 LPF h a:
. P ase
Sepa 4 19 m I Rag 05c Compare, . IPHotDept} J,
Lam 5 13 Pilot m I I I vco sm'
r. in 6 l7 LPF Stereo Smtrlcal L__Pr
| 9mm Reactance
Rm 7 l6 LPF I emu: r 1
Rout 15 Mute ||1 FF F F F F Stereo
3 33tz 19km " raw: 9mm
mute 9 M Mute Cunt W. v l
MAM 1o 13 srmo
Mute out it i2 GND Decode,
Mutmgcontrol Mutrng

} ELAMSelec- out
Wr- - £4

L_____._______.___.l

N -* All
L _ _ L a Fll _
- tr Ufl- EW-
A" .. W m 23:" t5. W r R m "at. 2:43: u:
4. Pin Function Description
K0! " Symbol I/O Functions and Operations

1 AM in I This is an input terminal for AM detection signal.

2 FM in I This is an input terminal for FM detection signal.

3 Wow 0 Output of MPX pilot signal (Connect to Pin18).

4 Speaker Aiu - Separation adjustment.

5 L out 0 Left channel signal output.

6 L o Reversal output of pins.

7 R o Reversal output of pins.

5 R out 0 Right channel signal output

9 Muting Cont . The mute time is controlled by the connected capacitor when tuning the power switch on

10 FM/AM l Changer over the FM/AM input. 'H': AM, 'L' : FM.

11 Mute out _ Not use.

12 GND _ Ground terminal.

13 Stereo 0 Stereo indicator output.Stereo:L,Mono :H'

14 Mute out _ The mute time is controlled by the connected capacitor when changing over the FM/AM

15 Mute in | Mute signal input. H: Mute on, 'L' : Mute

16 LPF . Low pass filter of pilot detector

17 Lpp _ While this terminal goes to 'H',the VCO stop.

18 Pilotin 1 Pilot input.

19 Map _ Low-pass filter of PLL

20 LP}: _ Low-pass filter of PLL

21 vco I Voltage controlled oscillator terminal.

22 Vcc _ Power suplly

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Page 35

I LA2786(|C601):Dolby Pro Logic Surround Signal Processor

1. Terminal Layout

U
1 42
21 22

2. Pin Functions

RX-BSORBK

a: Symbol l/O Function Kit? Symbol l/O Function
1 Capacitor for spectrum in noise Capacitor for time constant
NS-BFF1 sequencer 22 V034 " (in log defferential area)
Capacitor for spectrum in noise Capacitor for time constant
2 NS-BFF2 " sequencer 23 VCS'2 (in log defferential area)
Capacitor for time constant
3 VREF " Analog reference voltage 24 VCS'TH " (in log defferential area)
4 SDC'OUT " Capacitor for DC-cut Sch 25 HR RECT " Capacitor tor Center Channel detection
5 C-DC-OUT " Capacitor for DC-cut Cch 25 DC'CUT - Capacitor for DC-cut at detection circuit
6 LDC'OUT Capacitor for DC-cut Lch 27 L'R HECT " Capacitor lor Surround channel detection
7 R'DC'OUT " Capacitor for DC-cut Rch 23 DC'CUT " Capacitor for DC-cut at detection circuit
8 VREF BUFFER -» VFtEF low impedance 29 RBPF3 -- LPF,HPF ior Lch Right channel control circuit
9 UN I Left channel signal input 30 R'BPF2 -- LPF,HPF for Lch Right channel control circuit
10 R-lN I Ground 31 R'BPF1 " LPF,HPF for Lch Right channel control circuit
11 GND " LPF,HPF for Lch control 32 CTR'M DC'CUT " Capacitor for DC-cut Center Channel
Capacitor for Center Channel output
12 L-BPF1 LPF,HPF Left channel control circuit 33 C'MODECAPS -- low pass filter
13 L-BFF2 LPF,HPF Left channel control circuit 34 COUT 0 Center signal output
14 L-BPF3 -- LPF,HPF Left channel detection 35 301 O Surround signal output
15 DC-CUT Capacitor for DC»cut at detection circuit 36 HOUT 0 Right channel Signal output
16 R RECT " Capacitor Right channel detection 37 LOUT 0 Left channel signal output
17 DC-CUT -- Capacitor for DC-cut at detection circuit 38 Vcc -- Power supply
Oscillation for noise sequencer and
18 L RECT -- Capacitor for Left channel detection 39 080 -- auto balance
Capacitor for time constant
19 VLFl-TH -- (in log differential area) 40 STB I Strobe signal input
Capacitor for time constant
20 VLR-2 -- (in log defferential area) 41 DATA I Serial interface data input
Capacitor for time constant
21 VLFi-1 -- (in log defferential area) 42 CLK | Serial interface clock

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