Jvc RX 816 RBK Service Manual

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RX-816RBK

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RX-816RBK

Area Suffix

BS the U.K.

EF .. . . Continental Europe
EN Scandinavia

G ..... Germany

GI Italy

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Contents

Safety Precautions ........................ 1-2 Adjustment Procedures ................... 1-47
Instruction Book .......................... 1-3 Block Diagram ......................... 1-49
Description of Major [03 ................. 1-24 Schematic Diagram ..................... 1-53
Internal Connection of Display ........... 1-43 Printed Circuit Boards ................... 1-59
Disosssembly Proceduers ................. 1-45 Parts List ............................ 2-1

No. 20535

Jun. 1995

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http : //getMANUAL . com

RX-816RBK

--Safety Precautions

1.The 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 (A3) on the Parts
List in the Service Manual. The use of a substitute repalcement 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,
contorl shafts, etc.) to be sure the product is safe to operate without danger of electrical
shock.

00 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 10 W
resistor paralleled by a 0.15 11F AC-type capacitor between an exposed metal part and a
known good earth ground.

AC VOLTM ETER

Measure the AC voltage across the resistor -
with the AC voltmeter. a 531%??on
Move the resistor connection to each exposed 0 °_ 0' m°'ee"i"VitY-l
metal part, particularly any exposed metal part
having a return path to the chassis, and 0,151.; Ac TYPE
meausre the AC voltage across the resistor. 1,
Now, reverse the plug in the AC outlet and 9
repeat each measurement. Any voltage v 2:295:36
measured must not exceed 0.75VAC (r.m.s.). 150° 10W metal part.
This corresponds to 0.5 mA AC (r.m.s.). Good earth ground

-Warnrng

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. It 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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RX-816RBK

I XR1095CP(IC404): Graphic Equalizer Filter & Display driver

1.Terminal Layout 2- Pi" function
Pin No. Symbol Function
1~5,9~16 A1 ~A13 Anode terminal
42 30~38 G1~69 Grid terminal
25 RIN Right channel input
§ § 26 LIN Left channel input
22 DIM Brightness control varies width of G output.
21 22 Filter amplitude display duration control. A resistor and
27 GPH timing capacitor from this pin to VSS adjust Peak Hold Decay
Time.
28 TPH Total output display on/ off control.
40 CLKR Oscillator timing resistor between this pin and CLKC pin.
41 CLKC Oscillator timing capacitor between this pin and V55.
20 $1 Chip select 1 pin.
21 51 Chip select 2 pin.
19 DI Serial port data.
18 SPCLK Serial port clock.
17 CS Chip Select.
42 VDD Plus supply, nominally 5VDC.
23 V55 Minus supply. nominaly -5VDC.
24 GND Analog input reference.
3. Block Diagram
VDD GND VSS\ GPH TPH
E] El El
_63Hz Peak Decay
- Filter _ Detector _ Control
_ 1_60H2 _ Peak _
FlltEr Detector
_ 490H2 _ Peak
Fllter Detector
RIN 1kHz Peak
LIN 2 Filter " Detector ' MPX -> Ato D A
V DRIVER -E|A1~A1a
2.5kHz Peak . .
-- - - - Digital «-
Filter Detector Control
_ 6_.3kHz _ Peak _ J '
Filter Detector . '
DI Ital
__ 1§kHz __ Peak Pea Hold
Filter Detector
CLKR El- Clock G G
CM [II-- 05C " Divider MPX DRIVER -UG'~G9
51 D- Latch
sz [3-- Interface
DI [3- Control
SPCLK E}- DIM
CS [3--

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