Text preview for : mb167.pdf part of JVC RX 6042 SERVICE MANUAL
Back to : RX 6042.part1.rar | Home
SERVICE MANUAL
AUDIO/VIDEO CONTROL RECEIVER
3 2004 MB167
RX-6042S
Area suffix E ----------- Continental Europe EN ------------ Northern Europe EV -------------- Eastern Europe
TA/NEWS/INFO
DISPLAY MODE
TABLE OF CONTENTS
1 2 3 4 5 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MB167 2004/3
SPECIFICATION
Amplifier Output Power At Stereo operation At Surround operation Front channels Front channels Center channel 100 W per channel, min. RMS, driven into 8 , 40 Hz to 20 kHz with no more than 0.8% total harmonic distortion. 100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion. 100 W, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion.
Surround channels 100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion. Audio Audio Input Sensitivity/Impedance (1 kHz) CD, TAPE/CDR, VCR, TV SOUND, DVD:220 mV/47 k Audio Input (DIGITAL IN)* Coaxial Optical DIGITAL 1 (DVD):0.5 V(p-p)/75 DIGITAL 2 (CD), DIGITAL 3 (TV):-21 dBm to -15 dBm (660 nm ±30 nm)
* Corresponding to Linear PCM, Dolby Digital, and DTS Digital Surround (with sampling frequency-32 kHz, 44.1 kHz, 48 kHz) Recording Output Level Signal-to-Noise Ratio ('66 IHF/'78 IHF) Frequency Response (8 ) Bass Boost Equalization (5 bands) Video Video Input Sensitivity/Impedance Composite video:DVD, VCR S-video:DVD, VCR Component:DVD, VCR Video Output Level 1 V(p-p)/75 (Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 (Y: luminance):1 V(p-p)/75 (PB, PR):0.7 V(p-p)/75 Composite video:VCR, MONITOR OUT 1 V(p-p)/75 S-video:VCR, MONITOR OUT Component:MONITOR OUT Synchronization Signal-to-Noise Ratio Tuning Range Usable Sensitivity 50 dB Quieting Sensitivity Stereo Separation at OUT (REC) Tuning Range Power Requirements Power Consumption Dimensions (W × H × D) Mass Negative 45 dB FM tuner (IHF) 87,50 MHz - 108,00 MHz Monaural:17,0 dBf (1,9 µV/75 ) Monaural:21,3 dBf (3,2 µV/75 ) Stereo:41,3 dBf (31,8 µV/75 ) 35 dB at 1 kHz AM tuner 522 kHz to 1 629 kHz General AC 230V , 50 Hz 200 W, 2 W (in standby mode) 435 mm × 146.5 mm × 409.5 mm 8.8 kg (Y: luminance):1 V(p-p)/75 (C: chrominance, burst):0.286 V(p-p)/75 (Y: luminance):1 V(p-p)/75 (PB, PR):0.7 V(p-p)/75 TAPE/CDR, VCR:220 mV CD, TAPE/CDR, VCR, TV SOUND, DVD:87 dB/74 dB CD, TAPE/CDR, VCR, TV SOUND, DVD:20 Hz to 50 kHz (+1 dB, -3 dB) +3 dB ±1 dB at 100 Hz 63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz(±8 dB in 2 dB steps)
Designs and specifications are subject to change without notice.
1-2 (No.MB167)
SECTION 1 PRECAUTION
1.1 Safety Precautions voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)
(1) This 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 ( ) on the Parts List in the Service Manual. The use of a substitute replacement 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 reassembling. (5) Leakage shock hazard testing After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check. · 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.). · Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15µF AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC
0.15 F AC TYPE
Place this probe on each exposed metal part.
1500
Good earth ground
10W
1.2
Warning
(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.
1.3
Caution
Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.
1.4
Critical parts for safety
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (This regulation dose not Except the J and C version)
(No.MB167)1-3
SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.MB167)
SECTION 3 DISASSEMBLY
3.1 Removing the top cover (See Fig.1)
(1) From the right and left sides of the main body, remove the four screws A attaching the top cover. (2) From the back side of the main body, remove the three screws B attaching the top cover. (3) Remove the top cover in the direction of the arrow 2 while extending the lower sections of the top cover in the direction of the arrow 1.
2 Top cover
B
1
1
A A
Fig.1
3.2
Removing the front panel assembly (See Figs.2 and 3)
· Prior to performing the following procedure, remove the top cover. (1) Disconnect the card wire from the connector CN402 on the audio board. (See Fig.2) (2) Disconnect the card wire from the connector CN201 on the power supply board. (See Fig.2) (3) Remove the tie bands. (See Fig.2) (4) Remove the wire protection board fixing the card wire. (See Fig.2) (5) Disconnect the wire from the connector CN403 on audio board. (See Fig.2) (6) Remove the three screws C attaching the front panel assembly. (See Fig.2) (7) From the bottom side of the main body, remove the four screws D attaching the front panel assembly. (See Fig.3) (8) Remove the front panel assembly in the direction of the arrow. (See Fig.3)
Front panel assembly
C
Tie band Wire protection board Card wire Tie band CN402 Audio board
C
Card wire
C
CN201
CN403 Fig.2
Power supply board
Front panel assembly
D
D
Fig.3
(No.MB167)1-5
3.3
Removing the rear panel (See Fig.4)
· Prior to performing the following procedure, remove the top cover. (1) From the back side of the main body, remove the strain relief from the rear panel in the direction of the arrow. (2) Remove the twenty-six screws E and four screws F attaching the rear panel.
E E F
Rear panel
E
Strain relief
F
E F
Fig.4 3.4 Removing the component board and tuner unit (See Figs.5 and 6)
· Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, disconnect the parallel wire from the connector CN511 on the S-Video board. (See Fig.5) (2) From the back side of the main body, remove the four screws G attaching the component board. (See Fig.6) (3) From the top side of the main body, disconnect the card wire from the connector CN1 on the tuner unit. (See Fig.5) (4) From the back side of the main body, remove the two screws H attaching the tuner unit. (See Fig.6)
CN511
CN1
S-Video board Parallel wire Component board Tuner Fig.5
H
G
Fig.6
1-6 (No.MB167)
3.5
Removing the DSP board, audio input board, DVD board and video board (See Fig.7)
· Prior to performing the following procedure, remove the top cover and rear panel. (1) From the top side of the main body, Remove the tie band. (2) Disconnect the DSP board from the connector CN481 on the audio board. (3) Disconnect the audio input board from the connector CN421 on the audio board. (4) Disconnect the DVD board from the connector CN431 on the audio board. (5) Disconnect the video board from the connector CN441 on the audio board.
DVD board Video board
Audio board
Tie band CN481
DSP board CN421 CN431 CN441 Audio input board Fig.7
3.6 Removing the S-Video board (See Fig.8)
· Prior to performing the following procedure, remove the top cover and rear panel. (1) From the top side of the main body, disconnect the parallel wire from the connector CN511 on the S-Video board. (2) Disconnect the S-Video board from the connector CN461 on the audio board.
Audio board
S-Video board
CN461
CN511 Fig.8
(No.MB167)1-7
3.7
Removing the audio board (See Fig.9)
· Prior to performing the following procedure, remove the top cover, rear panel, component video board, DSP board, audio input board, DVD board, video board, S-Video board and tuner unit. (1) From the top side of the main body, disconnect the card wire from the connector CN402 on the audio board. (2) Disconnect the relay board from the connector CN491 on the audio board. (3) Disconnect the wires from the connectors CN471, CN472 and CN473 on the audio board. (4) Remove the three screws J attaching the audio board. (5) Loosen the screw K attaching the audio board.
Relay board Audio board Power supply board
J
J K
CN403 CN402 CN471 CN472 CN491 CN473 Fig.9
3.8 Removing the speaker terminal board (See Fig.10)
· Prior to performing the following procedure, remove the top cover and rear panel. (1) From the top side of the main body, remove the solders from the soldered sections a on the speaker terminal board.
Parallel wires
Speaker terminal board Soldered sections a Fig.10
1-8 (No.MB167)
3.9
Removing the main board (See Fig.11)
· Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, remove the tie bands fixing the wires. (2) Remove the tie band and wire protection board fixing the card wire. (3) Remove the solders from the soldered section b on the speaker terminal board attaching the parallel wires. (4) Disconnect the relay board from the connectors (CN291, CN491) on the power supply board and audio board. (5) Disconnect the parallel wire from the connector CN241 on the power supply board. (6) Disconnect the wire from the connector CN251 on the power transformer board 1. (7) Disconnect the wires from the connectors CN471, CN472 and CN473 on the audio board. (8) Remove the screw L, two screws M and four screws N attaching the main board. (9) Take out the main board.
Relay Power Wire board protection N N transformer Power supply board 1 board Main Tie board band CN241 board
Tie band
CN251 CN291 Tie bands Parallel wires
N M L
Card wire Tie band
M
Tie band
Audio board
3.10 Removing the heat sink (See Figs.12 and 13) · Prior to performing the following procedure, remove the top cover and main board. (1) Remove the ten screws P attaching the heat sink. (See Fig.12) (2) From the reverse side of the main board, remove the two screws Q attaching the heat sink. (See Fig.13)
CN473 CN472 CN492 Speaker CN471 Soldered terminal board section b Fig.11
Heat sink
P
Main board
Fig.12
P
Heat sink
Q
Q
Main board
Fig.13
(No.MB167)1-9
3.11 Removing the center amp. board, front amp. boards (L/R) and rear amp. boards (L/R) (See Figs.12 and 14) · Prior to performing the following procedure, remove the top cover and main board. (1) Remove the ten screws P attaching the heat sink. (See Fig.12) (2) Disconnect the center amp. board from the connector CN321 on the main board. (See Fig.14) (3) Disconnect the front amp. board (L) from the connector CN311 on the main board. (See Fig.14) (4) Disconnect the front amp. board (R) from the connector CN312 on the main board. (See Fig.14) (5) Disconnect the rear amp. board (L) from the connector CN331 on the main board. (See Fig.14) (6) Disconnect the rear amp. board (R) from the connector CN332 on the main board. (See Fig.14)
Rear amp. Front amp. board (L) board (L) Rear amp. Front amp. Center amp. board (R) board (R) board
CN332
CN331 CN312
CN311 CN321 Main board Fig.14
3.12 Removing the power transformer (See Fig.15) · Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, remove the tie bands fixing the wires. (2) Remove the solders from the soldered section c on the power transformer board 1. (3) Remove the solders from the soldered sections d on the power transformer board 2. (4) Disconnect the wire from the connector CN251 on the power transformer board 1. (5) Remove the four screws R attaching the power transformer. 3.13 Removing the power/fuse board (See Fig.15) · Prior to performing the following procedure, remove the top cover. (1) From the back and top sides of the main body, remove the screw S and screw T attaching the power/fuse board. (2) Remove the solders from the soldered sections e attaching the power cord. (3) From the reverse side of the power/fuse board, remove the solders from the soldered sections f attaching the wires.
Power transformer board 1
CN251
Tie band
Soldered section c
Tie band
R
R
Power transformer
R
Soldered sections d
R T
Power transformer board 2 Soldered sections f Power/Fuse board Soldered sections e
Power cord
S
Fig.15
1-10 (No.MB167)
3.14 Removing the power supply board (See Fig.16) · Prior to performing the following procedure, remove the top cover. (1) From the top side of the main body, disconnect the parallel wires from the connectors CN203 and CN241 on the power supply board. (2) Disconnect the card wire from the connector CN201 on the power supply board. (3) Disconnect the relay board from the connector CN291 on the power supply board. (4) Disconnect the parallel wire from the connector CN101 on the headphone jack board. (5) Remove the solders from the soldered section c on the power transformer board 1. (6) Remove the two screws U and the screw V attaching the power supply board. (7) Remove the power supply board from the hook g of the chassis base bracket in the direction of the arrow, take out the power supply board. (8) Turn over the power supply board, remove the solders from the soldered sections h attaching the wires. 3.15 Removing the headphone jack board (See Figs.16 and 17) · Prior to performing the following procedure, remove the top cover and front panel assembly. (1) From the top side of the main body, disconnect the parallel wire from the connector CN101 on the headphone jack board. (See Fig.16) (2) From the front side of the main body, remove the nut and screw W attaching the bracket(phones) to the chassis base. (See Fig.17)
Card wire CN241
Power supply board Headphone jack board
U
CN201
CN101 Parallel wires CN203 CN291 Parallel wire
U
Soldered section h
Relay board
V
Soldered section c
Hook g of the chassis base bracket
Power transformer board 1
Fig.16
Headphone jack board Nut Bracket(phones)
W
Chassis base
Fig.17
(No.MB167)1-11
3.16 Removing the system control board and power switch board (See Figs.18 and 19) · Prior to performing the following procedure, remove the top cover and front panel assembly. (1) Pull out the volume and jog knobs from the front side of the front panel assembly, remove the nut attaching the system control board. (See Fig.18) (2) From the back side of the front panel assembly, remove the nine screws X attaching the system control board. (See Fig.19) (3) Remove the solders of the soldered section j on the system control board and disconnect the parallel wire. (See Fig.19) (4) Remove the two screws Y attaching the power switch board. (See Fig.19)
Front panel assembly
Nut
Volume knob
Jog knob
Fig.18
Front panel assembly
X
System control board Parallel wire
Y
X
X
Soldered section j Fig.19 Power switch board
1-12 (No.MB167)
SECTION 4 ADJUSTMENT
4.1 Tuner section 4.1.1 Tuner range FM : 87.5 MHz to 108.0 MHz AM : 522 kHz to 1629 kHz 4.2 Power amplifier section
4.2.1 Adjustment of idling current Measurement location : TP301 (Lch) , TP302 (Rch) Adjustment part : VR301 (Lch) , VR302 (Rch) Attention : This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an internal temperature has risen). Please adjust immediately after using the amplifier after turning off the power supply of the amplifier and falling an internal temperature. Adjustment method (1) Set the volume control to minimum during this adjustment. (No signal & No load) (2) Set the surround mode OFF. (3) Turn VR301 and VR302 fully counterclockwise to warm up before adjustment. If the heat sink is already warm from previous use the correct adjustment can not be made. (4) For L-ch, connect a DC voltmeter between TP301's B216 and B217 (Lch) and, connect it between TP302's B218 and B219 (Rch). (5) Adjust the VR301 (Lch) and VR302 (Rch) so that the DC voltmeter indicates 2.0mV immediately after turning the power on. · It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR301, VR302) in the direction of counterclockwise.
VR301 (Lch) Front amp. board (L)
TP301 VR301
CN301
TP301 (Lch)
VR302 (Rch) Front amp. board (R)
TP302 VR302
CN302
TP302 (Rch)
(No.MB167)1-13
SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING.
1-14 (No.MB167)
(No.MB167)1-15
VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MB167)
Printed in Japan WPC