JVC DVL520U, DVL720U, DVL522U, DVL320U, GR-DVL220U service manual Important Safety Precautions

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 in-		12. Crimp type wire connector
scriptions on the cabinet, chassis and certain parts of the product.		In such cases as when replacing the power transformer in sets
When performing service, be sure to read and comply with these		where the connections between the power cord and power trans-
and other cautionary notices appearing in the operation and serv-		former primary lead wires are performed using crimp type connec-
ice manuals.		tors, if replacing the connectors is unavoidable, in order to prevent
		safety hazards, perform carefully and precisely according to the
2. Parts identified by the ! symbol and shaded (
	) parts are	following steps.
critical for safety.		1) Connector part number : E03830-001
Replace only with specified part numbers.
Note: Parts in this category also include those specified to com-		2) Required tool : Connector crimping tool of the proper type which
ply with X-ray emission standards for products using		will not damage insulated parts.
cathode ray tubes and those specified for compliance		3) Replacement procedure
with various regulations regarding spurious radiation		(1) Remove the old connector by cutting the wires at a point
emission.		close to the connector.
		Important : Do not reuse a connector (discard it).

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			cut close to connector
	3) High voltage leads				Fig.3
5.	Use specified insulating materials for hazardous live parts. Note			(2) Strip about 15 mm of the insulation from the ends of the
	especially:
	1) Insulation Tape	3) Spacers	5) Barrier	wires. If the wires are stranded, twist the strands to avoid
	2) PVC tubing	4) Insulation sheets for transistors		frayed conductors.
6.	When replacing AC primary side components (transformers, power				15 mm
	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			Metal sleeve
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				Connector
	parts.				Fig.5
9.	When a power cord has been replaced, check that 10-15 kg of			(4) As shown in Fig.6, use the crimping tool to crimp the metal
	force in any direction will not loosen it.
				sleeve at the center position. Be sure to crimp fully to the
				complete closure of the tool.
	Power cord
					25	Crimping tool
					1.
				2.
				5.	0
				5
		Fig.2			Fig.6
10.	Also check areas surrounding repaired locations.			(5) Check the four points noted in Fig.7.
11.	Products using cathode ray tubes (CRTs)			Not easily pulled free	Crimped at approx. center
						of metal sleeve
	In regard to such products, the cathode ray tubes themselves, the
	high voltage circuits, and related circuits are specified for compli-
	ance with recognized codes pertaining to X-ray emission.
	Consequently, when servicing these products, replace the cath-					Conductors extended
	ode ray tubes and other parts with only the specified parts. Under			Wire insulation recessed
	no circumstances attempt to modify these circuits.
				more than 4 mm
	Unauthorized modification can increase the high voltage value and
					Fig.7
	cause X-ray emission from the cathode ray tube.

I S40888-01