JVC HR-XVC28BUC, HR-XVC28BUS, HR-XVC29SUC, HR-XVC29SUS Service Manual

SERVICE MANUAL

DVD PLAYER & VIDEO CASSETTE RECORDER

HR-XVC28BUC, HR-XVC28BUS, HR-XVC29SUC, HR-XVC29SUS

HR-XVC28BUC, HR-XVC28BUS, HR-XVC29SUC, HR-XVC29SUS [D5PV1]

For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY).

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15 5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

COPYRIGHT © 2005 Victor Company of Japan, Limited

No.YD052

2005/3

		SPECIFICATION
GENERAL
Power requirement		AC 120 V, 60 Hz
Power consumption
Power on		25 W
Power off		2.0 W
Temperature
Operating		5°C to 40°C (41°F to 104°F)
Storage		-20°C to 60°C (-4°F to140°F)
Operating position		Horizontal only
Dimensions (W × H × D)		435 mm x 93 mm x 272 mm
Weight		4.1 kg (9.1Ibs)
Format		VHS NTSC standard
Maximum recording time
(SP)		210 min. with T-210 video cassette
(EP)		630 min. with T-210 video cassette
VIDEO/AUDIO (VCR deck)
Signal system		NTSC color signal and EIA monochrome signal, 525 lines/60 fields
Recording system		DA4 (Double Azimuth) head helical scan system
Signal-to-noise ratio		45 dB
Horizontal resolution		230 lines
Frequency range		70 Hz to 10,000 Hz (Normal audio) 20 Hz to 20,000 Hz (Hi-Fi audio)
Input/Output		RCA connectors: IN × 1, OUT × 1
VIDEO/AUDIO (DVD deck)
Signal system		NTSC
Applicable disc		DVD (12 cm, 8 cm), CD (12 cm, 8 cm)
Audio characteristics		DVD:4 Hz - 22 KHz
Frequency response		CD:4 Hz - 20 KHz
S/N Ratio		90 dB
Harmonic distortion		0.1%
Wow and flutter		Below Measurable Level
Dynamic range		90 dB
Output
Component-Y		(RCA) 1.0 Vp-p/75 Ω
Component-PB/PR		(RCA) 0.7 Vp-p/75 Ω
Audio		(RCA) 2 Vrms, 1 KΩ
Digital Audio		(COAXIAL) 0.5 Vp-p/75 Ω
TUNER
Tuning system		Frequency synthesized tuner
Channel coverage		VHF: Channels 2 - 13, UHF: Channels 14 - 69, CATV: 113 Channels
RF output		Channel 3 or 4 (switchable; preset to Channel 3 when shipped) 75 Ω , unbalanced
TIMER
Clock reference		Quartz
Program capacity		1-year programmable timer/8 programs
ACCESSORIES
Provided accessories		RF cable, Infrared remote control unit, "AA" battery × 2

•Specifications shown are for SP mode unless otherwise specified.

•E.& O.E. Design and specifications subject to change without notice.

•Manufactured under license from Dolby Laboratories. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories.

•"DTS" and "DTS 2.0 + Digital Out" are trademarks of Digital Theater Systems, Inc.

1-2 (No.YD052)

SECTION 1 PRECAUTION

1.1SAFTY 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.

1.1.1 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.

(2)Parts identified by the symbol and shaded ( ) parts are 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:

•Wires covered with PVC tubing

•Double insulated wires

•High voltage leads

(5)Use specified insulating materials for hazardous live parts. Note especially:

•Insulation Tape

•PVC tubing

•Spacers

•Insulation sheets for transistors

•Barrier

(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.1-1-1

(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.

Power cord

Fig.1-1-2

(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.

(12)Crimp type wire connectorIn such cases as when replacing the power transformer in sets where the connections between the power cord and power trans former 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.

•Connector part number :E03830-001

•Required tool : Connector crimping tool of the proper type which will not damage insulated parts.

•Replacement procedure

a)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.1-1-3

b)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

Fig.1-1-4

c)Align the lengths of the wires to be connected. Insert the wires fully into the connector.

Metal sleeve

Connector

Fig.1-1-5

d)As shown in Fig.1-1-6, 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.

25	Crimping tool
1.
2.
0

5.5

Fig.1-1-6

e) Check the four points noted in Fig.1-1-7.

	Not easily pulled free	Crimped at approx. center
		of metal sleeve
		Conductors extended

Wire insulation recessed more than 4 mm

Fig.1-1-7

(No.YD052)1-3

1.1.2 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 Fig.1-1-11 below.

(3)Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic parts. See Fig.1-1-11 below.

d

d'

Chassis

Power cord primary wire

Fig.1-1-8

(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 Fig.1-1-9 and following Fig.1-1-12.

		a	b
Externally	Z	A	c
exposed	V
accessible part

Fig.1-1-9

(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 Fig.1-1-10 and grounding specifications.

AC inlet

Exposed accessible part

Earth pin

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

Fig.1-1-10

AC Line Voltage

Region

( )

Dielectric Strength

Clearance Distance (d), (d')

Insulation Resistance R

100 V

Japan

R

1 M /500 V DC

AC 1 kV 1 minute

d, d'

3 mm

100 to 240 V

AC 1.5 kV 1 minute

d, d'

4 mm

110 to 130 V

USA & Canada

1 M

R

12 M /500 V DC

AC 1 kV 1 minute

d, d'

3.2 mm

110 to 130 V

AC 3 kV 1 minute

d

4 mm

Europe & Australia

R

10 M /500 V DC

(Class

)

d'

8 mm

(Power cord)

200 to 240 V

AC 1.5 kV 1 minute

d'

6 mm (Primary wire)

(Class

)

Fig.1-1-11

AC Line Voltage

Region

Load Z

Leakage Current (i)

a, b, c

100 V

Japan

1

i

1 mA rms

Exposed accessible parts

110 to 130 V

USA & Canada

0.15

i

0.5 mA rms

Exposed accessible parts

1.5

110 to 130 V

2

i

0.7 mA peak

Antenna earth terminals

Europe & Australia

i

2 mA dc

220 to 240 V

i

0.7 mA peak

Other terminals

50

i

2 mA dc

Fig.1-1-12

NOTE :

These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

1-4 (No.YD052)

1.2Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.2.1Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed.

(1)Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2)Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(3)Handling the optical pickup

•In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.

(Refer to the text.)

•Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

(No.YD052)1-5

1.3Precautions for Service

1.3.1 Handling of Traverse Unit and Laser Pickup

(1)Do not touch any peripheral element of the pickup or the actuator.

(2)The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock.

(3)Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.)

(4)To replace the traverse unit, pull out the metal short pin for protection from charging.

(5)When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center of the flexible wire to open the circuit.

(6)Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block. Do not change the setting of these half-fixed resistors for laser power adjustment.

1.3.2 Destruction of Traverse Unit and Laser Pickup by Static Electricity

Laser diodes are easily destroyed by static electricity charged on clothingor the human body. Before repairing peripheral elements of the traverse unit or pickup, be sure to take the following electrostatic protection:

(1)Wear an antistatic wrist wrap.

(2)With a conductive sheet or a steel plate on the workbench on which the traverse unit or the pick up is to be repaired, ground the sheet or the plate.

(3)It solders to two short circuit sections on the substrate of a pick-up.

(4)After removing the flexible wire from the connector (CN101), short-circuit the flexible wire by the metal clip.

(5)Short-circuit the laser diode by soldering the land which is provided at the center of the flexible wire for the pickup. After completing the repair, remove the solder to open the circuit.

Pick-up

CN101

Short circuit

* Please refer to the SECTION3 DISASSEMBLY method for details.

DVD SERVO CONTROL BOARD

1-6 (No.YD052)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1Different table of feature

The following table indicates main different points between models HR-XVC28BUC, HR-XVC28BUS, HR-XVC29SUC and HRXVC29SUS.

	HR-XVC28BUC	HR-XVC28BUS	HR-XVC29SUC	HR-XVC29SUS
BODY COLOR	BLACK	←	PURE SILVER	←
MP3 PLAYBACK	USED	NOT USED	USED	NOT USED
NOTE :
Mark ← is same as left.

2.2 Service position

This unit has been designed so that the Mechanism and Main board assemblies can be removed together from the bottom chassis. Before diagnosing or servicing the circuit boards, take out the major parts from the bottom chassis.

2.2.1 How to set the "Service position"

(1)Refer to the disassembly procedure and perform the disassembly of the major parts before removing the Mechanism assembly.

(2)Remove the screws that fix the Mechanism, Main board assembly to the bottom chassis. If any other screws are used to fix the boards, remove them also.

(3)Remove the combined Mechanism and Main board assemblies.

(4)If any other major parts are used, remove them also.

(5)Connect the wires and connectors of the major parts that have been removed in steps (1) to (4). (Refer to Fig. 2-2a.)

(6)Place the combined Mechanism, Main board and other board assemblies upside down.

(7)Insert the power cord plug into the power outlet and then proceed with the diagnostics and servicing of the board assembly.

Notes:

•Before inserting the power cord plug into the power outlet, make sure that none of the electrical parts are able to short-circuit between the workbench and the board assembly.

•For the disassembly procedure of the major parts and details of the precautions to be taken, see "Removing the major parts".

•If there are wire connections from the Main board and Mechanism assemblies to the other major parts, be sure to remove them (including wires connected to the major parts) first before performing step (2).

•When carrying out diagnosis and repair of the Main board assembly in the "Service position", be sure to ground both the Main board and Mechanism assemblies. If they are improperly grounded, there may be noise on the playback picture or FDP counter display may move even when the mechanism is kept in an inoperative status.

•In order to diagnose the playback or recording of the cassette tape, set the Mechanism assembly to the required mode before placing it upside down. If the mechanism mode is changed (including ejection) while it is in an upside down position the tape inside may be damaged.

•For some models, the mechanism and board assemblies are attached by connectors only. When carrying out a diagnosis or repair of the boards in the "Service position", make sure that the connectors are not disconnected.

		TP111 D.FF
	TP4001 CTL.P
	TP106 PB FM		Main board assembly
	TP2253 A.PB FM
	Display board assembly	Switch/jack board assembly
		Fig.2-2a

2.3Jig RCU mode

This unit uses the following two modes for receiving remote control codes.

(1)User RCU mode:Ordinary mode for use by the user.

(2)Jig RCU mode: Mode for use in production and servicing. When using the Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). As both of the above two modes are stored in the EEPROM, it is required to set the VCR back to the User RCU mode each time that an adjustment is made or to check that the necessary operations have been completed.These modes can be set by the operations described below.

Note:

•Confirm the RCU mode when exchanged parts. Since some SERVICE PARTS sets the VCR to the Jig RCU mode as initial setting. Therefore please set the VCR to the user RCU mode after replacing the EEPROM.

(No.YD052)1-7

User RCU mode

Jig RCU mode

( not displayed)

Fig.2-3a User/Jig RCU mode

2.3.1Setting the Jig RCU mode

(1) Turn on the power.

(2) Press the following remocon keys continuously within 2 seconds " SET UP " → " 2 " → " 8 " → " ENTER ".

When the VCR is set to the Jig RCU mode, the symbols ( " : " ) in the time display of the FDP are turned off. (Refer to Fig.2-3a)

2.3.2Setting the User RCU mode

(1)Turn off the power.

(2)Press the "REC" and "PAUSE" buttons of the VCR simultaneously. Alternatively, transmit the code "43-80" from the Jig RCU.

2.4Mechanism service mode

This model has a unique function to enter the mechanism into every operation mode without loading of any cassette tape. This function is called the "Mechanism service mode".

2.4.1 How to set the "Mechanism service mode"

(1)Set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received)

(2)Transmit the code "43-E5" from the Jig RCU.

(3)Release the lug of the Cassette holder and then slide the Cassette holder toward the direction where the Cassette holder is loaded by manually.

(4)The cassette holder lowers and, when the loading has completed, the mechanism enters the desired mode. When the VCR is set to the Mechanism service mode, the symbols ("Timer") in the FDP (LED) are blinked.

2.4.2 How to exit from the "Mechanism service mode"

(1)Unplug the power cord plug from the power outlet.

2.5Maintenance and inspection

2.5.1 Cleaning

Regular cleaning of the transport system parts is desirable but practically impossible. So make it a rule to carry out cleaning of the tape transport system whenever the machine is serviced.

When the video head, tape guide and/or brush get soiled, the playback picture may appear inferior or at worst disappear, resulting in possible tape damage.

Note:

•Absolutely avoid sweeping the upper drum vertically as this will cause damage to the video head.

(1)When cleaning the upper drum (especially the video head), soak a piece of closely woven cloth with alcohol and while holding the cloth onto the upper drum by the fingers, turn the upper drum counterclockwise.

(2)To clean the parts of the tape transport system other than the upper drum, use a piece of closely woven cloth or a cotton swab soaked with alcohol.

1-8 (No.YD052)

(3)After cleaning, make sure that the cleaned parts are completely dry before using the cassette tape.

A/C head	Video heads

Fig.2-5a

2.5.2 Lubrication

With no need for periodical lubrication, you have only to lubricate new parts after replacement. If any oil or grease on contact parts is soiled, wipe it off and newly lubricate the parts.

Note:

•See the "mechanism assembly" diagram of the "parts list" for the lubricating or greasing spots, and for the types of oil or grease to be used.

2.5.3 Suggested servicing schedule for main components

The following table indicates the suggested period for such service measures as cleaning, lubrication and replacement. In practice, the indicated periods will vary widely according to environmental and usage conditions. However, the indicated components should be inspected when a set is brought for service and the maintenance work performed if necessary. Also note that rubber parts may deform in time, even if the set is not used.

System		Parts name		Operation hours
				1000H	2000H
		Drum assembly		C,X	X
		A/C head		C,X	C,X
Tape		Pinch roller arm assembly		C	C
		Full erase head		C	C
transport
		Tension arm assembly		C	C
		Capstan motor (Shaft)		C	C
		Guide arm assembly		C	C
		Capstan motor			X
		Capstan brake assembly			X
		Main brake assembly			X
Drive		Belt (Capstan)		X	X
		Loading motor			X
		Clutch unit			X
		Worm gear			X
		Control plate			X
Other		Rotary encoder			X
C : Cleaning
X : Inspection or Replacement if necessary

SECTION 3

DISASSEMBLY

3.1Removing the major parts

3.1.1 Destination of connectors

Two kinds of double-arrows in connection tables respectively show kinds of connector/wires.

			: Flat wire		: Wire		: Board to board (B-B)
			: The connector of the side to remove
	CONN. No.				CONNECTOR				PIN No.
		WR2a		Main	CN101		Digital	CN761	40
		WR2b		Main	CN103		Digital	CN762	10
Destination of connectors
	CONN. No.				CONNECTOR				PIN No.
		WR2a		Main	CN7103		Switch/jack	CN7191	10
		WR2b		Main	CN3102		Display	CN7003	22
		WR3a		Main	CN2001		A/C head		6
		WR3b		Drum			Main	CN1	9
				assembly
		WR4a		Main	CN7302		DVD	CN503	17
							servo control
		WR4b		Main	CN7301		DVD	CN501	19
							servo control
		WR4c		Main	CN3301		DVD	CN1	5
							servo control

3.1.2 How to read the procedure table

This table shows the steps for disassembly of the externally furnished parts and board assemblies. Reverse these steps when re-assembling them.

	Step/		Part Name		Fig.		Point		Note
	LocNo.				No.
	[1]		Top cover		3-1a		4(S1a),(S1b),3(L1a),		<Note 1a>
							2(SD1a),(P1a),(W1a),
							CN1(WR1a),
			Bracket				----------------------------------------
							2(S1c)
	(1)		(2)		(3)		(4)		(5)

(1)Order of steps in Procedure

When reassembling, perform the step(s) in the reverse order.

These numbers are also used as the identification (location) No. of parts Figures.

(2)Part name to be removed or installed.

(3)Fig. No. showing procedure or part location.

(4)Identification of part to be removed, unhooked, unlocked, released, unplugged, unclamped or unsoldered.

P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder, CN**(WR**)= Remove the wire (WR**) from the connector (CN**).

Note:

•The bracketed ( ) WR of the connector symbol are assigned nos. in priority order and do not correspond to those on the spare parts list.

(5)Adjustment information for installation

3.1.3		Disassembly procedure
	Step/	Part Name	Fig.	Point	Note
	LocNo.		No.
	[1]	Top cover	3-1d	8(S1a)
	[2]	Front panel assembly	3-1a	4(L2a),5(L2b),2(S2a)	<Note 2a>
		(Display board assembly)	3-1d	CN7103(WR2a),	<Note 2b>
		(Switch/jack board assembly)		CN3102(WR2b)
	[3]	Mechanism assembly	3-1b	CN2001(WR3a)	<Note 2a>
			3-1c	3(S3a),(S3b)	<Note 3a>
		(Drum assembly)	3-1d	--------------------------	<Note 3b>
				CN(WR3b)
				(S3c),(S3d),(S3e)	<Note 3c>
	[4]	DVD unit	3-1d	3(S4a),3(S4b),
		(Bracket)		CN7302(WR4a),
				CN7301(WR46),
				CN3301(WR4c)
	[5]	Rear cover	3-1d	5(S5a),5(L5a)
	[6]	Main board assembly	3-1d	3(S6a)

<Note 2a>

•Be careful not to damage the connector and wire etc. during connection and disconnection.

•When connecting the flat wire to the connector, be careful with the flat wire direction.

<Note 2b>

•When reattaching the Front panel assembly, make sure that the door opener of the Side frame (R) is lowered in position prior to the reinstallation.

•When reattaching the Front panel assembly, pay careful attention to the switch lever of the Front panel assembly not to make it touch the switch knob of the Main board assembly from the side.

•When reattaching the Front panel assembly, lift the Cassette door slightly.

	Door
	opener
	Side	Switch
		lever
	frame(R)
		Switch
		knob
		Fig.3-1a

<Note 3a>

•When reattaching the Mechanism assembly, secure the screws (S3a to S3b) in the order of 1,2,3.

<Note 3b>

•When reattaching the Mechanism assembly, be sure to align the phase of the Rotary encoder on the Main board assembly.

•When reattaching the Mechanism assembly, set the "Mechanism assembling mode". [See "MECHANISM ASSEMBLY SERVICE MANUAL (No. 86700)".]

•When reattaching the Mechanism assembly to the Main board assembly, take care not to damage the sensors and switch on the Main board assembly.

(No.YD052)1-9