JVC GC-QX5HDU Service Manual

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MAIN BOARD ASSEMBLY <01> MODEL REF NO. ITEM
PW1 MAIN BOARD ASSEMBLY

GC-QX3U
YB10282B-06

GC-QX3HDU
YB10299K-03

GC-QX5HDU
YB10299U-01

CCD BOARD ASSEMBLY <02> MODEL REF NO. ITEM
PW1 CCD BOARD ASSEMBLY

GC-QX3U
YB10283A1-04

GC-QX3HDU
YB10300K1-02

GC-QX5HDU
YB10300U1-01

MONI REG BOARD ASSEMBLY <03> MODEL REF NO. ITEM
PW4 MONI REG BOARD ASSEMBLY

GC-QX3U
YB10283A4-04

GC-QX3HDU
YB10300K4-02

GC-QX5HDU
YB10300U4-01

JACK BOARD ASSEMBLY <04> MODEL REF NO. ITEM
PW2 JACK BOARD ASSEMBLY

GC-QX3U
YB10283A2-04

GC-QX3HDU
YB10300K2-02

GC-QX5HDU
YB10300U2-01

STROBE BOARD ASSEMBLY <05> MODEL REF NO. ITEM
PW3 STROBE BOARD ASSEMBLY

GC-QX3U
YB10283A3-04

GC-QX3HDU
YB10300K3-02

GC-QX5HDU
YB10300U3-01

Important Safety Precautions
Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.

Precautions during Servicing
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and certain parts of the product. When performing service, be sure to read and comply with these and other cautionary notices appearing in the operation and service manuals. symbol and shaded ( ) parts are 2. Parts identified by the critical for safety. Replace only with specified part numbers. Note: Parts in this category also include those specified to comply with X-ray emission standards for products using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission. 3. Fuse replacement caution notice. Caution for continued protection against fire hazard. Replace only with same type and rated fuse(s) as specified. 4. Use specified internal wiring. Note especially: 1) Wires covered with PVC tubing 2) Double insulated wires 3) High voltage leads 5. Use specified insulating materials for hazardous live parts. Note especially: 1) Insulation Tape 3) Spacer
s 5) Barrier 2) PVC tubing 4) Insulation sheets for transistors 6. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering. Fig.4 (3) Align the lengths of the wires to be connected. Insert the wires fully into the connector. Fig.1 7. Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.) 8. Check that replaced wires do not contact sharp edged or pointed parts. 9. When a power cord has been replaced, check that 10-15 kg of force in any direction will not loosen it. 12. Crimp type wire connector In such cases as when replacing the power transformer in sets where the connections between the power cord and power transformer primary lead wires are performed using crimp type connectors, if replacing the connectors is unavoidable, in order to prevent safety hazards, perform carefully and precisely according to the following steps. 1) Connect
or part number : E03830-001 2) Required tool : Connector crimping tool of the proper type which will not damage insulated parts. 3) Replacement procedure (1) Remove the old connector by cutting the wires at a point close to the connector. Important : Do not reuse a connector (discard it).

cut close to connector

Fig.3 (2) Strip about 15 mm of the insulation from the ends of the wires. If the wires are stranded, twist the strands to avoid frayed conductors.
15 mm

Metal sleeve

Connector
Fig.5 (4) As shown in Fig.6, use the crimping tool to crimp the metal sleeve at the center position. Be sure to crimp fully to the complete closure of the tool.

Power cord
1.2 5 2.0 5.5

Crimping tool

Fig.2 10. Also check areas surrounding repaired locations. 11. Products using cathode ray tubes (CRTs) In regard to such products, the cathode ray tubes themselves, the high voltage circuits, and related circuits are specified for compliance with recognized codes pertaining to X-ray emission. Consequently, when servicing these products, replace the cathode ray tubes and other parts with only the specified parts. Under no circumstances attempt to modify these circuits. Unauthorized modification can increase the high voltage value and cause X-ray emission from the cathode ray tube.

Fig.6 (5) Check the four points noted in Fig.7.
Not easily pulled free Crimped at approx. center of metal sleeve

Conductors extended Wire insulation recessed more than 4 mm

Fig.7

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Safety Check after Servicing
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions, Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards. 1. Insulation resistance test Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table 1 below. 2. Dielectric strength test Confirm specified dielectric strength or greater between power cord plug prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table 1 below. 3. Clearance distance When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between termin
als and surrounding metallic parts. See table 1 below. Chassis Fig. 8 4. Leakage current test Confirm specified or lower leakage current between earth ground/power cord plug prongs and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). Measuring Method : (Power ON) Insert load Z between earth ground/power cord plug prongs and externally exposed accessible parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and following table 2.

d d'
Power cord, primary wire

a

b c

Externally exposed accessible part

Z V

Fig. 9 5. Grounding (Class 1 model only) Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in, Video out, Audio in, Audio out or Fixing screw etc.). Measuring Method: Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.

AC inlet

Exposed accessible part

Grounding Specifications Region USA & Canada Europe & Australia Grounding Impedance (Z) Z 0.1 ohm Z 0.5 ohm

Earth pin Milli ohm meter
Fig. 10

AC Line Voltage 100 V 100 to 240 V 110 to 130 V 110 to 130 V 200 to 240 V

Region Japan USA & Canada Europe & Australia

Insulation Resistance (R) R 1 M/500 V DC 1 M R 12 M/500 V DC R 10 M/500 V DC

Dielectric Strength AC 1 kV 1 minute AC 1.5 kV 1 miute AC 1 kV 1 minute AC 3 kV 1 minute (Class 2) AC 1.5 kV 1 minute (Class 1)

Clearance Distance (d), (d') d, d' 3 mm d, d' 4 mm d, d' 3.2 mm d 4 mm d' 8 mm (Power cord) d' 6 mm (Primary wire)

Table 1 Specifications for each region

AC Line Voltage 100 V 110 to 130 V 110 to 130 V 220 to 240 V

Region Japan USA & Canada
0.15 µF

Load Z
1 k

Leakage Current (i) i 1 mA rms i 0.5 mA rms i 0.7 mA peak i 2 mA dc i 0.7 mA peak i 2 mA dc

a, b, c Exposed accessible parts Exposed accessible parts Antenna earth terminals Other terminals

1.5 k 2 k 50 k

Europe & Australia

Table 2 Leakage current specifications for each region Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

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