JVC CA-UXP55 Service Manual Download Page 10

Page: 10 / 42

1-10 (No.22036)

2.1.7

Removing the power amplifier board / power amplifi-
er sub board / main board / heat sink
(See Fig.13 ~ 21)

• Prior to performing the following procedure, remove the metal

cover, the rear cover, the CD-R mechanism assembly and the
rear panel.

(1) Disconnect the card wire from connector CN900, CN901,

CN933 and CN931 on the main board respectively.

(2) Disconnect the wire from connector CN949, CN950 and

CN951 on the power supply board.

(3) Remove the two screws

on the right side of the body.

(4) Move the boards and heat sink assembly upwards and dis-

engage the joint

and the two joints

to release the power

amplifier board and the main board from the chassis (Refer
toFig.15 , 16).
Move the rear part of the board and heat sink assembly to
the right side.

CAUTION:

The wire extending from the lower side of the main board
is still connected with the body (Refer to Fig.17).

(5) Disconnect the wire from connector CN906 on the lower

side of the main board (Refer to Fig.18).

2.1.8

Removing the power amplifier board
(See Fig.19 ~ 21)

(1) Disconnect the power amplifier board from connector

CN941 on the power amplifier sub board.

2.1.9

Removing the power amplifier sub board
(See Fig.19 ~ 21)

(1) Disconnect the two wires from connector CN944, CN945,

CN946 and CN947 on the power amplifier sub board.

(2) Remove the two screws

attaching the power amplifier

sub board and the heat sink.

2.1.10 Removing the main board

(See Fig.19 ~ 21)

(1) Disconnect the wires from connector CN944, CN945,

CN946 and CN947 on the power amplifier sub board.

(2) Remove the two screws

attaching the main board and

the heat sink.

REFERENCE:

The power amplifier board, the power amplifier sub board, the
main board and the heat sink can be remove drespectively.

Fig.13

Fig.14

Fig.15

Fig.16

CN931

CN901

CN900

Main board

Power supply board

CN949 / CN950 / CN951

Front panel assembly

CN933

Main board

CN900

Power supply board

CN949

Front panel assembly

CN950

CN951

CN933

CN931

CN901

Joint e

Main board

Front panel assembly

Joint d

Chassis

Heat sink

Power amplifier board

Summary of Contents for CA-UXP55

Page 1: ... CD TAPE FM AM M I C R O C O M P O N E N T S Y S T E M U X P 5 5 C D R R W P L A Y B A C K MD AUX TIMER CLOCK STANDBY ON STANDBY ON VOLUME FUNCTION SOUND DIRECT OPERATING AHB PRO REV MODE PHONES A U T O R E V E R S E REC REC SLEEP STANDBY ON MD AUX FM AM TAPE CD DISPLAY DIMMER REPEAT RANDOM PROG FM MODE AUTO PRESET SOUND MODE CD CANCEL MULTI KEY SET PTY EON DISPLAY MODE RM SUXP5R REMOTE CONTROL VO...

Page 2: ...dphone 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 particular ly any exposed metal part having a return path to the chassis to a kn...

Page 3: ...same safety characteristics as the recommended replacement parts shown in the Parts List of the Service Manual and 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 ser...

Page 4: ...tical pickup The tester s internal power source can easily destroy the laser diode 1 7 Handling the traverse unit optical pickup 1 Do not subject the traverse 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 procedure in the text ...

Page 5: ... equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated It is dangerous to defeat the safety switches 5 CAUTION If safety switches malfunction the laser is able to function 6 CAUTION Use of controls adjustments or performance of procedures other than those specified herein may result in hazardous radiation ex...

Page 6: ...oving the metal cover See Fig 1 2 1 Remove the six screws A on the back of the body 2 Remove the two screws B on the side of the body 3 Pull both sides of the metal cover outward and lift the rear part of the cover Fig 1 Fig 2 A Metal cover A A A A Metal cover B x 2 ...

Page 7: ... 5 Prior to performing the following procedure remove the metal cover 1 Disconnect the card wire from connector CN1 on the tuner board 2 Remove the screw D on the right side of the body 3 Remove the two screws E on the rear panel 4 Remove the band bundling the wire and pull out the wire through the hole of the CD R board Fig 4 Fig 5 Rear cover C C Rear panel D Tuner board CD R board CN 1 Band Rear...

Page 8: ...ard wireconnecting the tuner board with the main board in advance 2 1 5 Remove the rear panel See Fig 8 11 Prior to performing the following procedure remove the metal cover rear cover and the CD R mechanism assembly 1 Remove the seven screws G attaching the rear panel 2 Disconnect the card wire from CN902 on the main board 3 Disengage the lower two joints b on each side of the rear panel using a ...

Page 9: ...1 9 Fig 8 Fig 9 Fig 10 Fig 11 Fig 12 Rear panel F G G G Joint a Joint a G Fan CN902 Tuner board Rear panel Main board CN908 Rear panel Joint b Joint b Rear panel Rear panel H H Fan Joint c Joint c Joint c Joint c ...

Page 10: ...r CN906 on the lower side of the main board Refer to Fig 18 2 1 8 Removing the power amplifier board See Fig 19 21 1 Disconnect the power amplifier board from connector CN941 on the power amplifier sub board 2 1 9 Removing the power amplifier sub board See Fig 19 21 1 Disconnect the two wires from connector CN944 CN945 CN946 and CN947 on the power amplifier sub board 2 Remove the two screws J atta...

Page 11: ...er amplifier board Main board CN906 Power amplifier sub board Power amplifier board Heat sink Main board CN944 CN945 CN946 CN947 Power amplifier sub board CN941 Power amplifier board Heat sink Main board Heat sink Main board J K Power amplifier board Power amplifier sub board ...

Page 12: ...er board the power amplifier sub board and the main board fromthe chassis incompletely Refer to Fig 17 1 Remove the cord stopper upwards on the back of the body 2 Disconnect the power cord from connector J1000 on the board of the power transformer assembly 3 Remove the four screws L attaching the power transform er assembly Fig 22 Fig 23 Cord stopper Power cord J1000 Power transformer assembly L L...

Page 13: ...el Remove the assembly consisting of the power amplifier board the power amplifier sub board and the main board Refer to Fig 17 18 1 Remove the two screws M on each lower side of the body 2 Disengage the two joints f on each lower side of the body using a screwdriver andpull out the front panel assembly toward the front Fig 24 Fig 25 M Front panel assembly Joint c M Front panel assembly Joint c ...

Page 14: ...eleven screws N on the back of the front panel and remove the display board with the switch board 3 Remove the three screws O attaching the switch board to the LCD holder 4 If necessary unsolder the wire connected to connector FW931 on the display board and FW931 on the switch board Fig 26 Fig 27 Fig 28 Front panel assembly VOLUME knob N N N N N N Switch board Display board O Switch board Display ...

Page 15: ...ss the EJCT button on the front panel to open the cas sette door 2 Remove the four screws Q on the back of the front panel 2 1 16 Removing the LED board See Fig 30 32 Prior to performing the following procedure remove the front panel assembly 1 Press the EJCT button on the front panel to open the cas sette door 2 Remove the cassette holder in the direction of the arrow 3 Release the two joint hook...

Page 16: ...he reversing azimuth screw A retaining the play back recording erase head 7 Take out the playback recording erase head from the front of the head mount 2 2 2 Reassembling the playback recording eraser head 1 Reassemble the playback recording eraser head from the front of the head mount to the position as shown in Fig 3 2 Fix the reversing azimuth screw A 3 Attach the spring a from behind the playb...

Page 17: ...the main motor 2 2 4 Removing the main motor See Fig 4 to 7 Prior to the following procedure it is not necessary to remove the head amplifier mechanism control board 1 Remove the two screws C retaining the main motor 2 While raising the main motor remove the capstan belt from the motor pulley CAUTION Be sure to handle the capstan belt so carefully that this belt will not be stained by grease and s...

Page 18: ...See Fig 10 Prior to the following procedure remove the head amplifier mechanism control board Prior to the following procedure remove the main motor assembly 1 Remove one screw D attaching the reel pulse board 2 Remove the five fixing points e attaching the reel pulse board respectively in the arrow direction 3 From the front of the cassette mechanism assembly push the two fixing points f retainin...

Page 19: ...c voltmeter for two channels therefore the earth should be connected particularly carefully 7 In the case of BTL connection amp the minus terminal of speaker is not for earthing Therefore be sure not to connect any other earth terminal to this terminal This system is of an BTL system 8 For connecting a dummy resistor when measuring the output use the wire with a greater code size 9 Whenever any mi...

Page 20: ...1 Q305 Q302 B168 C334 B Q375 E Q376 Q371 B E C201 R101 R102 C104 R105 R106 R107 R108 C221 R110 R111 R112 R121 R201 R202 C204 R205 R206 R207 R208 C111 R210 R211 R212 R221 R301 R303 R304 B167 R335 R315 R314 R313 R310 R122 Q103 R305 B151 R371 R375 R376 R372 R338 R337 R341 R342 R343 R339 R336 R331 VR31 VR37 C210 C110 C102 C101 Q372 C213 C211 R215 D375 R115 R340 Q331 B113 R345 9 CN33 1 1 CN34 MS MB PBR...

Page 21: ...ent screw for the forward side and the adjustment screw for a reverse side Test tape VT712 3kHz of the forward is reproduced by finishing rolling and adjusted for the display of the frequency counter to become 2 940 3 090Hz by VR37 The maximum output 2 940 3 090Hz Only when the head is exchanged adjusts VR37 Item Mesurement condition Mesurement procedure Standard value Adjustment position Forward ...

Page 22: ...eating 1kHz and 10kHz of a standard frequency from the frequency transmitter 3 VR31 for L side and VR32 for R side are adjusted so that the recorded part may be reproduced and there is a difference between 1kHz and 10kHz in 1dB 2dB and the recording is repeated again AC 225 4 20 AC 514 4 0 Output difference 1kHz 10kHz 1dB 2dB VR31 Forward or reverse Test tape AC 514 TYPE Measurement terminal BIAS ...

Page 23: ...hes Automatic measurement of TE amplitude and automatic tuning of TE balance 500mv div 2ms div Fig 1 Approx 1sec pin 20 of IC601 TE Approx 1 7V VREF Tracking error waveform at TOC reading Power ON Power Key Confirm that the Focus error S cuve ie at the pin23 of IC601 is approx 2Vp p Confirm that the siganl from pin 5 6 of IC801 is a 2V accelerated pulse with approx 700ms Confirm the waveform of th...

Page 24: ...l block do not touch the semi fixed resistor If the laser power is lower than the specified value the la ser diode is almost worn out and the laser pickup should be replaced If the semi fixed resistor is adjusted while the pickup is functioning normally the laser pickup may be damaged due to excessive current 3 9 Replacement of laser pickup CD Is the level of RFOUT under 1 25V 0 22Vp p Replace it ...

Page 25: ...CAGC I Input terminal for AGC loop filter capacitor 8 ARF O AGC output terminal 9 CEA I Capacitor connecting terminal for HPF Amp 10 3TOUT O 3 TENV output terminal 11 CBDO 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 ...

Page 26: ...al operation amplifier Pin layout Block diagram 1 2 8 Vcc 7 OUT2 6 IN2 5 IN2 OUT1 1 IN1 2 IN1 3 VEE 4 Q19 Q17 Q16 OTHER CH R9 R6 R8 R7 R5 R4 R3 R2 R1 D1 C1 Q18 Q13 Q11 Q8 Q5 Vcc VEE OUTPUT IN IN Q1 Q3 Q4 Q2 C2 Q9 Q6 Q7 Q10 Q12 Q14 Q15 Q114 ...

Page 27: ...agram 4 4 KIA78S06P T IC932 Regulator Pin layout Block diagram Vout Vcc GND Demodulator Integrator Comparator B P F Limiter Amp GND Vcc Vout 1 2 3 Q14 Q12 Q13 Q10 Q11 Q4 Q3 Q5 Q6 Q1 Q2 Q7 Q8 Q9 Z1 R9 R3 R4 R1 R2 R8 R7 R5 R6 Q16 R11 R10 C1 3 INPUT 1 OUTPUT 2 COMMON ...

Page 28: ...B3 GND TRIG OC EN1 EN2 EN3 Pin No Symbol Function 1 FB1 REG1 feedback voltage input 2 VO1 REG1 output voltage 3 VINA Input DC supply voltage 4 TRIG Trigger for external SCR crowbar protection 5 OC Over current warning output 6 EN1 REG1 enable input 7 EN2 REG2 enable input 8 GND Analog ground 9 EN3 REG3 enable input 10 FB3 REG3 feedback voltage input 11 VO3 REG3 output voltage 12 N C Not connected ...

Page 29: ... 10 AM SD This is a terminal of AM ceramic filter 11 FM VSM O Adjust FM SD sensitivity 12 AM VSM O Adjust AM SD sensitivity 13 MUTE I O When the signal of IF REQ of IC121 LC72131 appear the signal of FM AM IF output Muting control input 14 FM AM I Change over the FM AM input H FM L AM 15 MONO ST O Stereo H Mono L 16 L OUT O Left channel signal output 17 R OUT O Right channel signal output 18 L IN ...

Page 30: ...BTL AMP 1 input pin Inverting side 7 Vo3 BTL AMP 2 input pin Inverting side 8 Vo4 BTL AMP 2 input pin Non inverting side 9 Vg2 BTL AMP 2 input pin For gain adjustment 10 Vin2 BTL AMP 2 input pin 11 Reg Out External transistor collector PNP connection 5V power supply output 12 Reg In External transistor PNP base connection 13 Res Reset output 14 Cd Reset output delay time setting Capacitor connecte...

Page 31: ...or 4pin input and 6pin output H 4 DI I Input for receive the serial data from controller 5 CLOCK I Sync signal input use 6 DO O Data output for Controller Output port 7 FM ST VCO O Low MW mode 8 AM FM O Open state after the power on reset 9 LW I O Input output port 10 MW I O Input output port 11 SDIN I O Data input output 12 IFIN I IF counter signal input 13 IFCONT O IF signal output 14 Not use 15...

Page 32: ...L5 L4 L3 L2 L1 CL VDD ROPOUT RINM RINP ROOUT RSB RBASS2 RBASS1 RTRE RVRIN RSELO R5 R4 R3 R2 R1 Vref 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9 10 11 12 13 RVref LVref CONTROL CIRCUIT CONTROL CIRCUIT CCB INTERFACE LOGIC CIRCUIT LOUT LSB LBASS2 LBASS1 LTRE LVRIN LSELO L5 L4 L3 L2 L1 Vref R1 R2 R3 R4 R5 RESLO RVRIN RTRE RBASS1 RBASS2 RSB ROUT RINP RINM ROPO...

Page 33: ...5 Input signal pin 15 L4 Input signal pin 16 L3 Input signal pin 17 L2 Input signal pin 18 L1 Input signal pin 19 Vref 0 5 x VDD voltage generation block for analog ground 20 R1 Input signal pin 21 R2 Input signal pin 22 R3 Input signal pin 23 R4 Input signal pin 24 R5 Input signal pin 25 RSELO Input selector output pin 26 RVRIN Volume input pin 27 RTRE Capacitor connection pin comprising treble b...

Page 34: ...CLK MDATA DSL PLL VCO AVDD2 SUB CODE BUFFER SSEL SQCK SUBQ AVDD2 CLVS CRC BLKCK CLDCK SBCK SUBC DEMPH RESY FLAG6 RESY EFM DEMODULATION SUBCODE DEMODULATION SYNC INTERPOLATION 16k SRAM CIRC ERROR CORRECTION DEINTERLEVE LRCKIN MSEL BCLK SSEL SRDATAIN PSEL IOSEL DIGITAL DEEMPHSIS 8TIMES OVER SAMPUNC DIGITAL FILTER 1BIT DAC LOGIC S PEM R PEM L DIGITAL AUDIO INTERFASE DIGITAL AUDIO INTERFASE INTER POLA...

Page 35: ... 32 FE I Focus error signal input Analog in put 33 TE I Tracking error signal input Analog in put 34 RF ENV I RF envelope signal input Analog in put 35 VDET I Vibration detect signal input H de tect 36 OFT I Off track signal input H off track 37 TRCRS I Track cross signal input 38 RFDET I RF detect signal input L detect 39 BDO I BDO input pin L detect 40 LDON I Laser ON signal output H on 42 TES O...

Page 36: ... Test input 8 XOUT O Crystal oscillator output 4 332MHz 9 XIN I Crystal oscillator input exeternal reference input 10 Vssd Digtal ground 11 Vddd Digtal power supply 12 MODE I Read mode setting 0 master 1 slave 13 RST I RDS ID RAM reset positive polarity 14 RDDA O RDS data output 15 RDCL I O RDS clock output master mode RDS clock input slave mode 16 RDS ID READY O RDS ID READY output negative polar...

Page 37: ...pply terminal for inside 54 Vss GND level 55 VLCD Power supply terminal for LCD drive 56 CE Chip enable 57 SCL Serial data transmission clock terminal 58 DATA Serial data input terminal 59 MODE Mode setting signal input terminal 60 INH Display off control signal input terminal 61 44 COM4 COM1 Common output terminal for LCD COMMON DRIVER OSC INPUT SELECTING CIRCUIT DIVIDING CIRCUIT DECORDER SHIFT R...

Page 38: ...ATA O Data input port 13 MCLK O Data clock 14 RST O Reset 15 MLD O Command ready signal 16 MUTE O Mute control port 17 SDATA VOLDA O Serial data Volume data 18 SCK VOLCK O Serial clock Volume clock 19 FLAG Not use 20 CLOSE I Door close switch input port 21 OPEN I Door open switch input port 22 FCD O CD Function H CD 23 NC Not use 24 NC Not use 25 VOLCE O Volumn Chip Enable 26 NC Not use 27 LINEMUT...

Page 39: ...ASS I Bass minus 55 VOL I Volumn minus 56 BASS I Bass plus 57 TUST CE O Tuner PLL strobe 58 FTUNER O Tuner function H TUNER 59 BUP O Back up power detect H BACKUP 60 RESET Reset signal 61 REM I Remote control input 62 RDSCK I RDS clock 63 MPX I FM stereo detection L STEREO 64 NC Not use 65 BCTL Not use 66 BLKCL I Block clock input port 67 VSS0 GND 68 VDD Power supply 69 X2 Not use 70 X1 Not use 71...

Page 40: ...8 7 6 5 4 3 2 1 Us POWER OUT Us POWER N C N C MUTE STAND BY Us SIGNAL Us SIGNAL BOOTSTRAP N C SUR NON INUERTING INPUT INVERTING INPUT STAND BY GND Vs BOOTSTRAP OUTPUT Vs SHORT CIRCUIT PROTECTION MOS CUTPUT STAGE MOS GHAIN LEVEL SHIFTING STAGE BIPOLAR TRANSCONDUCTANCE INPUT STAGE IN IN BOOTSTRAP ...

Page 41: ... No 22036 1 41 ...

Page 42: ... No 22036 AV MULTIMEDIA COMPANY AUDIO VIDEO SYSTEMS CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED WPC Printed in Japan ...

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