JVC MX-KA3 - Mini Shelf System Service Manual Download Page 19

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MX-KA3

1-19

Items

Measurement

conditions

Measurement method

Standard

values

Adjusting

positions

Cassette deck mechanism
(Front side)

Head azimuth screw

(Forward side)

PB Head
(Deck-A)

REC/PB Head
(Deck-B)

Head azimuth screw

(Reverse side)

Head azimuth screw

(Reverse side)

Head azimuth screw

(Forward side)

1. Playback the test tape VT703 (10KHz) or equivalent.
2. Adjust the head azimuth screw to obtain maximum

output and both output of L / R is in 3dB.

3. Put on the screw lock paint after alignments.

1. Insert the recording tape in deck-B.
2. Starting the recording.
3. Adjust the oscillation frequency to 80KHz+/-3KHz by

core of Oscillation coil of L301.

Test tape
: VT703 (10kHz)
Measurement output
terminal
: Left and Right
speaker output
(6-ohm loaded)
or
Headphone Output
(32-ohm loaded)

Test tape
: TYPE

AC-514

Measurement output
terminal
: Erase head terminal
(CN308 8-Pin)

Maximum output

80kHz+/-3kHz

Adjust the
head azimuth
screw only
when the head
has been
changed.

Use the High-
Impedance
Probe or
Frequency
counter input.

Cassette Head
Azimuth Alignments

Recording Bias
Frequency Alignment

Items

Measurement

conditions

Measurement method

Standard

values

Adjusting

positions

1. Set the Signal Generator signal to 530KHz the feed

to Loop Antenna.

2. Receiving the signal and the adjust the OSC coil (L2)

obtain the V.T is 1.40V +/-0.05V.

3. Change the receiving frequency to 600KHz (603KHz).
4. Adjust the Antenna coil ( L2 ) obtain maximum

sensitivity. (Adjust the SSG output to out of AGC range.)

1. Set the receiving frequency to 530KHz.

2. Feed the 450KHz signal to AM antenna input.
3.Adjust the IFT Block T1 obtain to maximum output.

(Adjust the SSG output to out of AGC range.)

Input signal
: 530kHz

600kHz

Adjustment point
: Antenna coil (L2)

Input signal
: 530kHz
Adjustment point
: IFT (T1)

V. T
: 1.40V+/-0.05V

Maximum
sensitivity

Maximum output

Adjust the OSC
coil only when
the AM coil block
has been changed.

Adjust the IFT
only when the
IFT block has
been changed.

AM Tracking
Alignments

AM IFT Alignments

Note: The adjustment of CD section is not required.

Tape recorder section

Tuner section

Arrangement of adjusting positions

Summary of Contents for MX-KA3 - Mini Shelf System

Page 1: ... 3 Important for laser products 1 4 Disassembly method 1 5 Adjustment method 1 18 Flow of functional operation until TOC read 1 20 Maintenance of laser pickup 1 21 Replacement of laser pickup 1 21 Description of major ICs 1 22 Area Suffix A Australia UJ U S Military UW Latin America U Asia CA MXKA3 SP MXKA3 SP MXKA3 COPYRIGHT 2003 VICTOR COMPANY OF JAPAN LTD ...

Page 2: ...uired the original lead routing and dress should be observed and it should be confirmed that they have been returned to normal after re assembling 5 Leakage currnet check Electrical shock hazard testing After re assembling 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...

Page 3: ...er diode in the optical pickup The testers internal power source can easily destroy the laser diode 4 Handling the CD changer unit optical pickup 1 Do not subject the CD changer unit optical pickup to strong shocks as it is a sensitive complex unit 2 Cut off the shorted part of the flexible cable using nippers etc after replacing the optical pickup For specific details refer to the replacement pro...

Page 4: ...ation when the drawer is open and the safety interlocks have failed or are defeated It is dangerous to defeat the safety switches Important for laser products FUSE CAUTION CAUTION REPLACE WITH SAME TYPE AND RATING FUSE S ATTENTION REMPLACER PAR UN LES FUSIBLE S DE MEME TYPE ET DE MEME VALEUR 5 CAUTION If safety switches malfunction the laser is able to function 6 CAUTION Use of controls adjustment...

Page 5: ... loading motor and belt of the CD changer tray Replacing the CD tray rotor belt of CD changer and removing the motor Front panel assembly Removing the cassette deck mechanism Removing the earphone jack PCB Removing the control FL PCB Removing the switch PCB and ACTIVE BASS EX switch PCB Removing the cassette deck main motor and replacing the main belts Removing the leaf switches of the cassette de...

Page 6: ...specified ratings Replacing the heat sink cover See Fig 3 1 Remove four screws B from the rear panel 2 Pull the heat sink cover outward Fig 1 Replacing the power IC See Fig 2 Prior to performing the following procedure remove the top cover 1 Remove the two screws A from the heat sink between the power IC 2 Remove the solder fixing the power IC W A Fig 2 CA MXKA3A Fig 3 A B CA MXKA3U UJ UW Fig 3 B ...

Page 7: ...panel rear of the body 2 Remove six screws D that retain the top cover from the two sides of the body 3 Remove the top cover from the body by lifting it toward the rear Fig 5 Right Front panel assembly D D Left Front panel assembly D D CA MXKA3A Fig 4 A Top cover C C C CA MXKA3U UJ UW Fig 4 B Top cover C C C ...

Page 8: ...e sections marked with arrows and pull out the CD tray toward the front b Remove the CD tray panel by pushing both of its extremities upward in the direction of the arrows c Push the CD tray deep into the set 1 Disconnect the cord wires from the CD PCB CN703 and CN203 2 From the rear of the set remove two screws E three screws F and four screws G on the front panel left and right side 3 Handle the...

Page 9: ...1 on the power amp PCB 2 Remove one screws H retaining the front panel assembly onto the bottom of the body 3 Remove two screws I on the left and right side of the set retaining the panel front from the bottom and then remove then GND lug b that comes from the power amp and supply PCB 4 Disengage the claws c on both sides of the front panel assembly and then remove the assembly Fig 10 H Fig 11 I e...

Page 10: ...N603B and CN604 on the CD PCB which is located on the back side of the CD changer unit 2 The 4 screws J that retain the CD PCB should be removed 3 Remove the CD PCB by pulling it toward the side where the CN601 is located 4 Using solder short the CD pickup to connect to short round Caution After re connecting the wires be sure to remove the shorting solder from the GND connection 5 Disconnect the ...

Page 11: ...cedures remove the top cover Also remove the CD changer unit 1 Turn the CD changer mechanism cover base and remove the screws d connecting the unit to the CD changer mechanism assembly 2 Removing four screws e retaining the CD mechanism holder assembly Caution When replacing the CD changer mechanism assembly be sure not to mistake the positions of the silver color and copper color spring CD change...

Page 12: ...over Also open the CD changer tray 1 Remove the two screws L retaining the CD changer tray loading motor 2 Remove the two screws M retaining the gear plate and take it out after remove the rotor belt from the pulley Replacing the CD turn table and remov ing the motor See Fig 19 Prior to performing the following procedures remove the top cover Also remove the CD changer unit 1 Remove the one screws...

Page 13: ...ws Z retaining the cassette deck mechanism Removing the earphone jack PCB See Fig 20 Prior to performing the following procedures remove the top cover Also remove the CD changer unit Also remove the front panel assembly 1 Remove the screw with the washer P that retains the earphone jack PCB Removing the control FL PCB See Fig 21 Prior to performing the following procedures remove the top cover Als...

Page 14: ... panel assembly 1 Pull out the volume control knob from the front of the front panel assembly Fig 22 2 Remove six screws Q retaining the front panel assembly 3 Remove the control FL PCB 4 Remove eleven screws R retaining the switch key 1 PCB Fig 20 5 Remove two screws S retaining the sound mode and CD function key 2 switch PCB Fig 21 Fig 22 Fig 23 Volume knob Front panel assembly Front panel assem...

Page 15: ...ches 5 Pull out the leaf switches from the front side of the cassette deck mechanism Removing the cassette deck main motor and replacing the main belts See Fig 19 24 and 25 Prior to performing the following procedures remove the top cover and both sides board Also remove the CD changer unit Also remove the front panel assembly 1 Remove six screws Z retaining the cassette deck mechanism Fig 19 2 Re...

Page 16: ...e faces up 3 Remove the solder from the bottom side of the head terminal and disconnect the wire 4 Remove screw U that retains the head 5 Remove screw V that retains the head 6 Hold the head and slide it in the direction of the arrow to remove it Removing the 3 pin regulator and bridge diode See Q904 Q907 D901 D914 and Fig 28 Prior to performing the following procedures remove the top cover and bo...

Page 17: ...r terminals and AUX terminal 5 Remove four screws YY that retains the rear panel and then remove the rear panel 6 Disconnect the parallel wires from the connectors FW951 on the power trans PCB 7 Remove screws Z that retain the power amp and supply PCB and then remove the assembly 8 Remove the clamp of AC power cord from the chassis 9 Remove four screws that retain the power trans PCB and then remo...

Page 18: ...W 522kHz 1710kHz A FM 87 5MHz 108MHz Standard measurement positions of volume and switch Power Standby Light STANDBY Indicator Sound Turbo A BASS EX OFF Sound mode OFF Main VOL 0 Minimum Travers mecha set position Disc 1 Precautions for measurement 1 Apply 30pF and 33kohm to the IF sweeper output side and 0 082 F and 100kohm in series to the sweeper input side 2 The IF sweeper output level should ...

Page 19: ...nged Use the High Impedance Probe or Frequency counter input Cassette Head Azimuth Alignments Recording Bias Frequency Alignment Items Measurement conditions Measurement method Standard values Adjusting positions 1 Set the Signal Generator signal to 530KHz the feed to Loop Antenna 2 Receiving the signal and the adjust the OSC coil L2 obtain the V T is 1 40V 0 05V 3 Change the receiving frequency t...

Page 20: ...tic measurement of TE amplitude and automatic tuning of TE balance 500mv div 2ms div Fig 1 Approx 3sec pin 20 of IC611 TE Approx 0 3V VREF Tracking error waveform at TOC reading Power ON Play Key Confirm that the Focus error S cuve signal at the pin32 of IC601 is approx 2Vp p Confirm that the signal from pin24 IC601 is 0V as a accelerated pulse during approx 400ms Confirm the waveform of the Track...

Page 21: ...ase try to clean the lens with a alcohol soaked cotton swab 2 Life of the laser diode When the life of the laser diode has expired the following symptoms will appear 1 The level of RF output EFM output ampli tude of eye pattern will below 3 Semi fixed resistor on the APC PC board The semi fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser po...

Page 22: ... TR4 TR7 TR9 TR11 TR12 TR14 TR15 TR10 TR13 TR5 TR8 TR6 TR3 R4 R7 R5 R2 D1 SUB R8 C2 R9 R10 R14 TR16 R12 R11 R13 DBA4DC VCC VCC 10000 F 10000 F 1 Terminal layout 2 Block diagram 3 Application circuit Description of major ICs STK402 070 IC304 Dual low noise operational ...

Page 23: ...MX KA3 1 23 1 Pin descriptions 2 Block diagram Optical disc ICs BA5936S IC621 ...

Page 24: ...n SW PBOUT R PB NF1 R AIN R BIN L GND V CC ALC DET GND IREF Test mode Open for normal use REC RETURN BIN R RECOUT R PB NF2 L NC NC EQOUT L RECIN L TAI L PB EQ L ALC L PBOUT L RECOUT L High Norm A REC Return ON OFF MUTE ON OFF REC MUTE OFF ON 21 22 23 24 25 26 27 28 29 30 Pin Description Equivalent Circuit cont VCC 12V Ta 25 C No Signal The value in the table shows typical value Pin No Pin Name Not...

Page 25: ... 2 9 V VCC GND EQ output 35 REC RETURN REC Return 34 BIN L 37 BIN R V 0 V PB NF BIN REC Return VCC 120 k PB B deck input 32 AIN L 39 AIN R V 0 V PB NF AIN GND VCC 120 k PB A deck input 24 RECIN L 7 RECIN R V VCC 2 REC EQ input 27 TAI L 4 TAI R V VCC 2 VCC 2 VCC 100 k Tape input Pin Description Equivalent Circuit VCC 12V Ta 25 C No Signal The value in the table shows typical value ...

Page 26: ... 100 k 22 k Mode control input 19 IREF V 1 2 V Equalizer refernce current input 18 36 GND GND pin 6 9 22 25 38 NC NC pin 20 Test mode GND TEST Test mode pin 31 PB NF1 L 40 PB NF1 R 30 PB NF2 L 1 PB NF2 R V 0 6 V VCC 330 k 180 PBNF1 PBNF2 PB EQ feed back Pin Description Equivalent Circuit cont VCC 12V Ta 25 C No Signal The value in the table shows typical value ...

Page 27: ... for HPF Amp 10 3TOUT O 3 TENV output terminal 11 CBOO I Capacitor connecting terminal for envelope detection on the darkness side 12 BDO O BDO output terminal 13 COFTR I Capacitor connecting terminal for envelope detection on the light side 14 OFTR O OFTR output terminal 15 NRFDET O NRFDET output terminal 16 GND Ground 17 VREF O VREF output terminal 18 VDET O VDET output terminal 19 TEBPF I VDET ...

Page 28: ...error signal output Kick pulse output Tracking drive output Focus drive output Reference voltage for D A output block Focus balance adjust signal output Tracking balance adjust signal output Focus error signal input Analog input Tracking error signal input Analog input RF envelope signal input Analog input Vibration detect signal input H Detect Off track signal input H Off track Track cross signal...

Page 29: ... 11 AM_IF IN I Input of AMIF signal 12 AGC I AGC voltage input terminal 13 FM_DET O FM detection signal output 14 ST MON_SW I Stereo Monaural switching signal input 15 AM FM_SW I AM FM switching signal input 16 L_OUT O Output L channel 17 R_OUT O Output R channel 18 MPX_IN I Multiplex signal input 19 DET_OUT O AM FM detection output 20 FM_OSC FM local oscillation circuit 21 VCC_2 Power supply term...

Page 30: ...UT MULTIPLEXER GAIN BASS BIN L BASS SPKR ATT RIGHT BOUT R BIN R SUPPLY CREF AGND VS 27 4 5 6 7 3 2 1 28 21 22 20 26 24 25 10 11 19 12 13 23 8 9 18 14 15 RB RB VREF 2 Block diagram LIN3 LIN4 MUXO L IN L MUXO R BIN R IN R BOUT R BIN L 1 3 2 4 5 6 7 8 9 BOUT L N C N C TRE R TRE L SCL SDA DGND CREF 23 22 21 20 19 17 18 16 15 10 11 12 13 14 28 27 26 25 24 RIN3 RIN2 RIN1 LIN1 LIN2 VS AGND ROUT LOUT RIN4...

Page 31: ... F 2 SI D Q Q 3 CK Ø Ø 1 ST 15 OE Q ØS Q D Ø Ø F F ØS ØS D Q ØS ØS LATCH 4 Q1 5 Q2 D Q Q Ø Ø F F D Q ØS ØS LATCH 6 Q3 D Q Q Ø Ø F F D Q ØS ØS LATCH 7 Q4 D Q Q Ø Ø F F D Q ØS ØS LATCH 14 Q5 D Q Q Ø Ø F F D Q ØS ØS LATCH 13 Q6 D Q Q Ø Ø F F D Q ØS ØS LATCH 12 Q7 D Q Q Ø Ø Ø Ø F F D Q ØS ØS LATCH 11 Q8 QS 9 Q S 10 TC74HC4094AP IC402 8 bit shift and store resister ...

Page 32: ...nput output port Input output port Data input output Function IF counter signal input IF signal output Not use AM Local OSC signal output FM Local OSC signal input Power supply VDD 4 5 5 5V When power ON Reset circuit move PLL charge pump output H Local OSC frequency Height than Reference frequency L Low Agreement Height impedance Output for active lowpassfilter of PLL Input for active lowpassfilt...

Page 33: ...A B C 1 2 3 4 5 P N BI1205441U P N BI12P402341 P N BI12P60142U P N BI12P100035U P N BI1205261U P N BI12P30215U P N BI1205291U P N BI12P80102U P N BI1205241U P N BI1205251U P N BI1205281U P N BI1203941 P N BI12P60143U P N BI12P90054U ...

Page 34: ...MX KA3 VICTOR COMPANY OF JAPAN LIMITED AV MULTIMEDIA COMPANY AUDIO VIDEO SYSTEMS CATEGORY 10 1 1Chome Ohwatari machi Maebashi city 371 8543 Japan No 22081 Printed in Japan 200308 ...

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