JVC PD-42DXT
Circuit Diagrams

PD-42DXT

PD-42DXT

PD-42DXT STANDARD CIRCUIT DIAGRAM
NOTE ON USING CIRCUIT DIAGRAMS
1.SAFETY
The components identified by the symbol and shading are critical for safety. For continued safety replace safety critical components only with manufactures recommended parts. Type No indication MM PP MPP MF TF BP TAN (3)Coils No unit Others (4)Power Supply :B1 20µS/div 5mS/div Sweeping time is specified :9V Respective voltage values are indicated (5)Test point :Test point (6)Connecting method :Connector :Receptacle (7)Ground symbol :LIVE side ground :ISOLATED(NEUTRAL) side ground :EARTH ground :DIGITAL ground :Wrapping or soldering :Only test point display :B2 (12V) :5V :[ µ H] :As specified :Ceramic capacitor :Metalized mylar capacitor :Polypropylene capacitor :Metalized polypropylene capacitor :Metalized film capacitor :Thin film capacitor :Bipolar electrolytic capacitor :Tantalum capacitor

CONTENTS
USING P.W. BOARD .......................................................................................................... 2-3 SEMICONDUCTOR SHAPES ........................................................................................... 2-3 BLOCK DIAGRAM - 1 ........................................................................................................ 2-4 BLOCK DIAGRAM - 2 ........................................................................................................ 2-5 CIRCUIT DIAGRAMS [RECEIVER UNIT]
MAIN PWB CIRCUIT DIAGRAM ....................................................................................................................... 2-7 SUB TUNER PWB CIRCUIT DIAGRAM ........................................................................................................... 2-31 RECEIVER POWER PWB CIRCUIT DIAGRAM .............................................................................................. 2-33 FRONT CONTROL PWB CIRCUIT DIAGRAM ................................................................................................. 2-35 SD CARD PWB CIRCUIT DIAGRAM ............................................................................................................... 2-37 DET RELAY PWB CIRCUIT DIAGRAM ........................................................................................................... 2-39

2.SPECIFIED VOLTAGE AND WAVEFORM VALUES
The voltage and waveform values have been measured under the following conditions. (1)Input signal (2)Setting positions of each knob/button and variable resistor (3)Internal resistance of tester (4)Oscilloscope sweeping time : Colour bar signal : Original setting position when shipped :DC 20k :H :V :Others (5)Voltage values /V

CIRCUIT DIAGRAMS [DISPLAY UNIT]
DISPLAY INTERFACE PWB CIRCUIT DIAGRAM ............................................................................................ 2-41 AUDIO PWB CIRCUIT DIAGRAM .................................................................................................................... 2-49 SPEAKER TERMINAL PWB CIRCUIT DIAGRAM ........................................................................................... 2-51 DISPLAY SWITCH PWB CIRCUIT DIAGRAM ................................................................................................. 2-53 DISPLAY LED PWB CIRCUIT DIAGRAM ........................................................................................................ 2-54 LINE FILTER PWB CIRCUIT DIAGRAM ........................................................................................................... 2-55 SYSTEM POWER PWB CIRCUIT DIAGRAM ................................................................................................. 2-57 PDP POWER PWB CIRCUIT DIAGRAM ......................................................................................................... 2-59

:All DC voltage values

Since the voltage values of signal circuit vary to some extent according to adjustments, use them as reference values.

3.INDICATION OF PARTS SYMBOL [EXAMPLE]
In the PW board :R1209 R209

PATTERN DIAGRAMS [RECEIVER UNIT]
RECEIVER POWER PWB PATTERN ............................................................................................................. 2-63 MAIN PWB PATTERN ..................................................................................................................................... 2-65 SUB TUNER PWB PATTERN .......................................................................................................................... 2-69 FRONT CONTROL PWB PATTERN ................................................................................................................ 2-71 DET RELAY PWB PATTERN .......................................................................................................................... 2-71

4.INDICATIONS ON THE CIRCUIT DIAGRAM
(1)Resistors Resistance value No unit :[ ] K :[K ] M :[M ] Rated allowable power No indication :1/ 16 [W] Others :As specified Type No indication OMR MFR MPR UNFR FR (2)Capacitors :Carbon resistor :Oxide metal film resistor :Metal film resistor :Metal plate resistor :Uninflammable resistor :Fusible resistor

PATTERN DIAGRAMS [DISPLAY UNIT]
DISPLAY INTERFACE PWB PATTERN ........................................................................................................... 2-73 AUDIO PWB PATTERN ................................................................................................................................... 2-75 PDP POWER PWB PATTERN ........................................................................................................................ 2-77 SYSTEM POWER PWB PATTERN ................................................................................................................ 2-81 LINE FILTER PWB PATTERN .......................................................................................................................... 2-82 SPEAKER TERMINAL PWB PATTERN .......................................................................................................... 2-83 DISPLAY SWITCH PWB PATTERN ................................................................................................................ 2-83 DISPLAY LED PWB PATTERN ....................................................................................................................... 2-84

5.NOTE FOR REPAIRING SERVICE
This model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( ) side GND and the ISOLATED(NEUTRAL) : ( ) side GND.Therefore, care must be taken for the following points. (1)Do not touch the LIVE side GND or the LIVE side GND and the ISOLATED(NEUTRAL) side GND simultaneously. If the above caution is not respected, an electric shock may be caused. Therefore, make sure that the power cord is surely removed from the receptacle when, for example, the chassis is pulled out. (2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL) side GND or never measure with a measuring apparatus measure with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND and ISOLATED(NEUTRAL) side GND at the same time. If the above precaution is not respected , a fuse or any parts will be broken. Since the circuit diagram is a standard one, the circuit and circuit constants may be subject to change for improvement without any notice. NOTE Due improvement in performance, some part numbers show in the circuit diagram may not agree with those indicated in the part list. When ordering parts, please use the numbers that appear in the Parts List.

VOLTAGE CHART [RECEIVER UNIT] ........................................................................... 2-85 VOLTAGE CHART [DISPLAY UNIT] ............................................................................... 2-86 WAVEFORMS .................................................................................................................. 2-88

Composition resistor 1/2 [W] is specified as 1/2S or Comp. Capacitance value 1 or higher less than 1 Withstand voltage No indication Others AC indicated :[pF] :[µF] :DC50[V] :DC withstand voltage [V] :AC withstand voltage [V]

Electrolytic Capacitors 47/50[Example]:Capacitance value [µF]/withstand voltage[V]

No.52108

2-1

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No.52108