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KD-LH1105

1-26 (No.49827)

3.3 Maintenance of laser pickup

(1) Cleaning the pick up lens

Before you replace the pick up, please 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.
• The level of RF output (EFM output:ampli tude of eye

pattern) will be low.

(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
power.Since this adjustment should be performed to match
the characteristics of the whole optical block, do not touch
the semi-fixed resistor. If the laser power is lower than the
specified value,the laser 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 la-
ser pickup may be damaged due to excessive current.

3.4 Replacement of laser pickup

Is RF output

1.0±0.35Vp-p?

Replace it.

O.K

NO

YES

Turn off the power switch and,disconnect the power cord

from the ac outlet.

Replace the pickup with a normal one.(Refer to

"Pickup Removal" on the previous page)

Plug the power cord in,and turn the power on.

At this time,check that the laser emits for about 3seconds

and the objective lens moves up and down.

Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at RF test point.

Finish.

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Summary of Contents for KD-LH1105

Page 1: ...COMPANY OF JAPAN LTD No 49827 2003 04 KD LH1105 CD RECEIVER 49827 2003 04 KD LH1105 TABLE OF CONTENTS 1 Important Safety Precautions 1 2 2 Disassembly method 1 4 3 Adjustment 1 23 4 Description of major ICs 1 27 Area Suffix U Otherr Areas ...

Page 2: ...autions 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 Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check ...

Page 3: ...iode in the optical pickup The tester s internal power source can easily destroy the laser diode 1 3 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 procedur...

Page 4: ... the front panel assembly 1 Remove the two screws A on the both sides of the main body See Fig 2 2 Remove the two screws B on the front side of the main body See Fig 3 3 Release the two joints a and two joints b on the both sides of the main body See Fig 2 4 Release the two joints c on the bottom side of the main body and remove the front chassis assembly in the direc tion of the arrow See Fig 4 F...

Page 5: ...rior to performing the following procedures remove the front panel assembly front chassis assembly and heat sink 1 Turn over the main body and release the two joints d two joints e and joint f CAUTION Do not damage the main board when releasing the joint f using a screwdriver See Figs 6 and 7 Fig 6 Fig 7 C D Heat sink Joints d Joints e Joint f Bottom cover Joints e Joints d Joint f Bottom cover ...

Page 6: ...cedures remove the front panel assembly front chassis assembly heat sink bottom cover and rear bracket 1 Remove the two screws H attaching the main board 2 Disconnect the connector CN601 and remove the main board in an upward direction Fig 9 2 1 7 Removing the CD mechanism assembly See Fig 10 Prior to performing the following procedures remove the front panel assembly front chassis assembly heat s...

Page 7: ...edures remove the front panel assembly 1 Remove the five screws K on the back side of the front pan el assembly See Fig 11 2 Release the eight joints g attaching the rear cover See Fig 12 3 Take out the front board See Fig 13 Fig 11 Fig 12 Fig 13 K K Front panel assembly Joints g Joints g Rear cover Front board ...

Page 8: ...2 1 Removing the top cover See Figs 1 and 2 1 Remove the two screws A on the both side of the body 2 Lift the front side of the top cover and move the top cover backward to release the two joints a Fig 1 Fig 2 A A A Joints a Top cover Joints a Top cover ...

Page 9: ...nnector board 2 Solder the short circuit point on the connector board 3 Disconnect the flexible wire from the pickup 4 Move the connector board in the direction of the arrow to release the two joints b 5 Unsolder the wire on the connector board if necessary CAUTION Unsolder the short circuit point after reassembling Fig 3 Fig 4 Fig 5 B Connector board Pickup Short circuit point Joints b Wires Pick...

Page 10: ...e DET switch See Figs 6 and 7 1 Extend the two tabs c of the feed sw holder and pull out the switch 2 Unsolder the DET switch wire if necessary Fig 6 Fig 7 Connector board DET switch Pickup DET switch Tab c Tab c DET switch wire Feed sw holder ...

Page 11: ...ing the chassis unit to the frame CAUTION The shape of the suspension spring L and R are dif ferent Handle them with care When reassembling make sure that the three shafts on the underside of the chassis unit are inserted to the dampers certainly Fig 8 Fig 9 Suspension spring L Suspension spring L Suspension spring R Suspension spring R Chassis unit Frame Chassis unit Frame Shafts Shaft Damper Dam...

Page 12: ... procedure remove the top cover 1 Remove the clamper arm spring 2 Move the clamper assembly in the direction of the arrow to release the two joints d Fig 10 Fig 11 Clamper arm spring Chassis rivet assembly Joint d Joint d Clamper assembly Clamper arm spring Clamper assembly Joint d Joint d Chassis rivet assembly ...

Page 13: ... Remove the screw C and move the loading feed motor assembly in the direction of the arrow to remove it from the chassis rivet assembly 2 Disconnect the wire from the loading feed motor assembly if necessary CAUTION When reassembling connect the wire from the loading feed motor assembly to the flame as shown in Fig 12 Fig 12 Fig 13 Loading feed motor assembly Loading feed motor assembly C ...

Page 14: ...screw F 2 Reattach the feed sw holder to the feed rack while setting the joint g to the slot of the feed rack and setting the part f of the feed rack to the switch of the feed sw holder correct ly 3 As the feed sw holder is temporarily attached to the pickup unit set to the gear of the joint g and to the bending part of the chassis joint h at a time CAUTION Make sure that the part i on the undersi...

Page 15: ...at the slot of the chassis rivet assembly respectively and join the joint k at a time Fig 19 Fig 20 2 2 10 Removing the top plate assembly See Fig 21 Prior to performing the following procedure remove the top cover connector board chassis unit and clamper assembly 1 Remove the screw H 2 Move the top plate assembly in the direction of the arrow to release the two joints r 3 Unsolder the wire marked...

Page 16: ...the direction of the arrow to release the joint u 2 Unsolder the wire of the mode sw marked s if necessary 3 Turn the select lock arm in the direction of the arrow to re lease the two joints v 4 The select lock arm spring comes off the select lock arm at the same time Fig 22 Fig 23 Mode sw Select lock arm Joint t Link plate Joint u s Top plate Top plate Select lock arm Select lock arm spring Selec...

Page 17: ... x on the underside of the select lock arm and join the select lock arm to the slots joint v Turn the select lock arm as shown in the figure 3 Reattach the mode sw while setting the part t to the first peak of the link plate gear and join the joint u CAUTION When reattaching the mode sw check if the points y and z are correctly fitted and if each part operates properly Fig 24 Fig 25 Fig 26 Select ...

Page 18: ...Figs 29 and 30 REFERENCE Reverse the above removing procedure 1 Reattach the link plate spring 2 Reattach the link plate to the link plate spring while joining them at joint d 3 Reattach the joint a of the select arm R to the first peak of the link plate while joining the two joints b with the slots Then turn the select arm R as shown in the figure The top plate is joined to the joint c CAUTION Wh...

Page 19: ...plate 5 Extend the lock arm rivet assembly outward and release the joint j from the boss of the chassis rivet assembly The roller guide springs on both sides come off at the same time CAUTION When reassembling reattach the left and right roller guide springs to the lock arm rivet assembly before reat taching the lock arm rivet assembly to the chassis rivet assembly Make sure to fit the part k of t...

Page 20: ...over chassis unit pickup unit and top plate assembly 1 Remove the screw K attaching the loading gear bracket The loading gear 6 and 7 come off the loading gear brack et 2 Pull out the loading gear 5 Fig 35 Fig 36 K Loading gear bracket Loading gear 6 Loading gear 5 Loading gear 3 K Loading gear bracket Loading gear 6 Loading gear 5 Loading gear 7 ...

Page 21: ...off 7 Remove the loading gear 1 8 Move the change plate rivet assembly in the direction of the arrow to release from the three shafts of the chassis rivet assembly upward See Fig 38 9 Detach the loading gear plate rivet assembly from the shaft of the chassis rivet assembly upward while releasing the joint p See Figs 38 and 40 10 Pull out the loading gear 4 Fig 37 Fig 38 Fig 39 Fig 40 Slot m Slot m...

Page 22: ...llowing procedure remove the top cover connector board chassis unit and clamper assembly 1 Remove the two screws L attaching the spindle motor as sembly through the slot of the turn table on top of the body 2 Unsolder the wire on the connector board if necessary Fig 41 Fig 42 L Turn table L Turn table Spindle motor ...

Page 23: ...ve dummy load should be used for AM and FM For FM dummy load there is a loss of 6dB between SSG output and antenna input The loss of 6dB need not be considered since direct reading of figures are applied in this working standard Standard volume position Balance and Bass Treble volume lndication 0 Loudness OFF Frequency Band FM 87 5MHz to 108 0MHz AM 531kHz to 1602 kHz The cardboard is cut in a sui...

Page 24: ...attern remains closed Tracking loop closed RF signal eye pattern opens TOC read out Jump to the first track Play When the laser diode correctly emits Microprocessor commands SEL TC94A14FA 38 LD CN501 15 No disc display When the disc correctly rotates Microprocessor commands DMO TC94A14FA 41 Spindle motor IC501 7 Tracking Servo Loop ON RF signal Rough Servo Mode CLV Servo Mode Program Area CLV Serv...

Page 25: ...ar at IC681 pins 10 and 11 Check the circuits in the vicinity of IC501 pins 8 9 and 15 Check the pickup and its connections NO NO NO NO YES YES YES YES YES Is the disk rotated Does the RF signal appear at RF test point Is the RF waveform at RF test point distorted Proceed to the Tracking section Is 4V present at IC681 pins 6 and 7 Check the spindle motor and its wiring Check the circuits in the vi...

Page 26: ...le optical block do not touch the semi fixed resistor If the laser power is lower than the specified value the laser 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 la ser pickup may be damaged due to excessive current 3 4 Replacement of laser pickup Is RF output 1 0 0 35Vp p Replace it O K NO YES ...

Page 27: ... Power supply GND GND A0 A1 A2 I No use connect to GND SCL I Serial clock input SDA I O Serial data I O of slave and ward address WP I Write protect terminal 8 Vcc 7 WP 6 SCL 5 SDA A0 1 A1 2 A2 3 GND 4 16kbit EEPROM allay 11bit 11bit 8bit Address decoder Slave Ward Address resister Data resister START STOP ACK Control circuit High voltage osc circuit Power supply voltage det ...

Page 28: ... OFF H ANT output ON 8 VCC Connected to VCC 9 BATT DET Low battery detect 10 AUDIO OUT Output voltage is 9V when M or H level applied to CTRL pin 11 CTRL L BIAS OFF M BIAS ON H CD ON 12 CD OUT Output voltage is 8V when H level applied to CTRL pin 13 ILM AJ Adjustment pin for ILM output voltage 14 ILM OUT Output voltage is 10V when M or H level applied to CTRL pin 15 GND Connected to GND 2 1 11 12 ...

Page 29: ...unction 1 2 VOUT VDD 4 3 VSS NC No Pin Name Function 1 Vout Reset Signal Output PIN 2 VDD VDD PIN Voltage Detect PIN 3 NC Non connect 4 VSS VSS PIN 1 VOUT 2 3 VDD VSS Vref NC 1 GND 2 4 Vcc 3 VOUT Vcc 4 NC 1 3 VOUT 2 GND Pin No Symbol Function 1 NC Non connect 2 GND GND terminal 3 VOUT Reset signal output terminal 4 Vcc Vcc terminal Voltage detect terminal ...

Page 30: ...7 4 5 LA47505 IC951 Power amp Terminal layout Muting On Time Control Circuit protective circuit Mute circuit Protective circuit Ripple Filter Stand by Switch 11 16 14 13 25 15 10 4 1 12 22 17 19 18 21 23 24 2 3 5 8 7 9 20 6 ...

Page 31: ...t 5 OUTFR Output for front Rch 6 Vcc1 2 Power input 7 OUTRR Output for rear Rch 8 GND2 Power GND 9 OUTRR Output for rear Rch 10 VREF Ripple filter 11 INRR Rear Rch input 12 INFR Front Rch input 13 SGND Signal GND 14 INFL Front Lch input 15 INRL Rear Lch input 16 ONTIME Power on time control 17 OUTRL Output for rear Lch 18 GND3 Power GND 19 OUTRL Output for rear Lch 20 Vcc3 4 Power input 21 OUTFL O...

Page 32: ...ND VIN1 SW MUTE VREFIN VCCS 3 3VREG REGIN VIN2G VIN2 VIN3G VIN3 FR VIN1 A VIN1 A VCCP1 VO VO VO2 VO2 VO3 VO3 VO4 VO4 VCCP2 VIN4 VIN4G FR H L VIN1_SW H OP AMP_A L OP AMP_B 33k 11k Signal system power supply All outputs ON OFF H ON L OFF MUTE Level shift Level shift Power system GND Signal system power supply 3 3VREG External PTP Tr Power system GND Level shift Level shift 33k 11k 11k 33k 33k 11k ...

Page 33: ...supply 13 VIN4 Input pin for channel 4 14 VIN4G Input pin for channel 4 for gain adjustment 15 VIN3 Input pin for channel 3 16 VIN3G Input pin for channel 3 for gain adjustment 17 VIN2 Input pin for channel 2 18 VIN2G Input pin for channel 2 for gain adjustment 19 REGIN External PNP transistor base connection 20 3 3VREG 3 3VREG output pin external PNP transistor collector connection 21 VCCS Signal...

Page 34: ...IN1 AVDD 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 DATA LATCH DGND OUT2 F5R2 F5O2 F5I2 F4R2 F4O2 F4I2 F3R2 F3O2 F3I2 F2R2 F2O2 F2I2 F1R2 F1O2 F1I2 IN2 REFIN GE5 GE4 GE3 GE2 GE1 GE5 GE4 GE3 GE2 GE1 12K 12K 12K 12K SBK 2K 70K 40K 40K CH2 CH1 AVSS AVDD 70K 2K 68K MICON INTERFACE ...

Page 35: ...input Block diagram Note CL includes probe and jig capacitance 1 2 3 4 5 6 7 1C 1A 1Y 2C 2A 2Y GND VCC 4C 4A 4Y 3C 3A 3Y 14 13 12 11 10 9 8 Input Output C A Y L X Z H L H H H L Vcc Vcc Input See Function Table 1A 2A 3A 4A 1C 2C 3C 4C 1Y 2Y 3Y 4Y Output Output Output Output Sample as Load Circuit 1 Sample as Load Circuit 1 Sample as Load Circuit 1 1k 1k S1 CL ...

Page 36: ...mory output 0 to 3 17 VDD Power supply 18 NC O Base clock output 19 GND Ground 20 XI I Connect to ground 21 NC O Not connect 22 VDD Power supply 23 OSCI I Crystal connecting terminal 25MHz 24 OSCO O Crystal connecting terminal 25MHz 25 MODE I Mode setting input pull up H memory extension mode 26 to 33 A4 to A11 O Extension memory output 4 to 11 34 AVDD Analog power supply 35 to 42 A12 to A19 O Ext...

Page 37: ... input Serial 72 KEYDATA O Key code data output Serial 73 SIFDA I O On board serial writing data input output pull up 74 SIFCK I On board serial writing clock input pull up 75 NMI I NMI H fix 76 DISPCE I Chip enable input for serial communication 77 Ground 78 PSAVE2 I POWER SAVE2 Memory power supply off detecting input 79 NC Not use 80 KEY_IN I Key interrupt input 81 ADSEP I Address data separate ...

Page 38: ...nction 1 to 8 A15 to A8 Address inputs 9 to 15 NC No connection 16 17 A18 A17 Address inputs 18 to 25 A7 to A0 Address inputs 26 CE Chip enable input 27 VSS Ground 28 OE Output enable input 29 D0 Data output 30 D8 Data output 31 D1 Data output 32 D9 Data output 33 D2 Data output 34 D10 Data output 35 D3 Data output 36 D11 Data output 37 VCC Power supply 38 D4 Data output 39 D12 Data output 40 D5 D...

Page 39: ...age regulator 1 2 3 4 8 1 Cs 2 Es 3 CT 4 GND 5 INVIN 6 Vcc 7 SI 8 CD 7 6 5 4 GND 3 2 1 5 6 Ipk sense Driver collector Switch collector Switch emitter Timing capacitor Comparator reversal input 7 8 V Q1 Q Q S R 2 C OSC COMP V 1 25V Ipk T REF A B 8 7 6 5 1 2 3 4 1 2 3 4 5 6 7 8 AOUTPUT A INPUT A INPUT V B INPUT B INPUT B OUTPUT V 1 2 3 5 4 PIN FUNCTION 1 GND 2 VIN 3 VOUT 4 NC 5 STB ...

Page 40: ...k 20k 3k 180k 240k 240k 15pF 15pF 40pF 40pF 10pF 60k 60k 22k 22k 94k 94k 14k 50k 20k 20k 20k 40k 50k PEAK 15k 40k 2k 1 75k 1 3V 2k 1k 180k 3k 12k 12k 20k 40k 30k 10pF 50 A BOTTOM PEAK K 1 x0 5 x2 x0 5 x2 PIN SEL APC SW TEB TE BAL RFGC AGC Gian TEB TE BAL VCTRLPIN VCC APC ON 50 12dB Normal mode 0dB HiZ APC ON 0 6dB Normal mode 0dB GND APC OFF LDO H 50 0dB CD RW mode 12dB ...

Page 41: ...cking search system 12 RFDC O RF signal peak detection output pin 13 GVSW I AGC FE TE amp gain change pin 14 VRO O Reference voltage VRO output pin VRO 1 2VCC When VCC 3 3V 15 FEO O Focus error signal generation amp output pin 16 FEN I Focus error signal generation amp negative phase input pin 17 RFRP O Signal amp output pin for track count Combining RFRP signal and TEO signal with TC94A14F FA con...

Page 42: ...put pin L for L channel and H for R channel Output polarity can be inverted by command 3 AOUT O Audio data output pin MSB first or LSB first selectable by command 4 DOUT O Digital data output pin Outputs up to double speed playback 5 IPF O Correction flag output pin When set to H AOUT output cannot be corrected by C2 correction processing 6 VDD3 Digital 3 3V power supply voltage pin 7 VSS3 Digital...

Page 43: ... H output with UHS H 39 AVDD3 Analog 3 3V power supply voltage pin 40 FMO O Feed equalizer output pin 41 DMO O Disc equalizer output pin 42 VSS3 Digital GND pin 43 VDD3 Digital 3 3V power supply voltage pin 44 TESIN I Test input pin Normally fixed to L 45 XVSS3 System clock oscillator GND pin 46 XI I System clock oscillator input pin 47 XO O System clock oscillator output pin 48 XVDD3 System clock...

Page 44: ... J version not use 21 STEERING REMOCON I Steering remocon input 22 KEY DATA I KEY DATA 23 AVDD A D converter power supply 24 AVREF0 A D reference voltage 25 VOL1 I Volume encoder pulse input 1 26 VOL2 I Volume encoder pulse input 2 27 28 NC Input L 29 IOP I IOP not use 3100series 30 MRC I MRC input 31 SQ I S Quality level input J version not use 32 SM I S METER input 33 AVSS Ground 34 NC Not use 3...

Page 45: ...r input L dimmer on 74 PS1 I Power save1 L ACC off 75 POWER O Power on off control output H power on 76 CD ON CD ON 1100series not use 3100series 77 MUTING O Muting output L muting on 78 CD MUTING I CD mute input L mute on not use 1100series 79 CD RESET O CD reset control out H reset on not use 1100series 80 LINE SEL I Feature selection H line input U57 not support L support 81 VDD Power supply 82...

Page 46: ...out Block diagram 1 2 3 Vcc Vcc Comp AGC AMP PD Detector BPF fo trimming circuit I V conversion magnetic shield Rout GND 22k 1 14 28 15 MIX Gain Auto Zero Mixing Stage Loudness Volume Soft Mute Treble Bass Input Multiplexer Mono Beep Beep Supply Digital Control I C Bus Zero Cross Mono Fader Mono Fader Mono Fader Mono Fader Mono Fader Mono Fader 2 ...

Page 47: ...KD LH1105 No 49827 1 47 ...

Page 48: ... No 49827 AV MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10 1 1chome Ohwatari machi Maebashi city 371 8543 Japan VICTOR COMPANY OF JAPAN LIMITED 200304WPC Printed in Japan KD LH1105 ...

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