SECTION 1 Important Safety Precautions Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across...
1.5 Safety Precautions (U.K only) (1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con- tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace- ment parts must be identical to those used in the original circuits.
Preventing 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. 1.6.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam. procedures other than those specified herein may result in 3.CAUTION : There are no serviceable parts inside the hazardous radiation exposure.
SECTION 2 Disassembly method Main body Metal cover 2.1.1 Removing 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.
2.1.2 Removing the rear cover (See Fig.3) • Prior to performing the following procedure, remove the metal cover. (1) Remove the two screws C on the back of the body. Rear cover Rear panel Fig.3 2.1.3 Removing the tuner board (See Fig.4, 5) •...
2.1.4 Removing the CD-R mechanism assembly Rear panel (See Fig.6 ~ 8) Main board • Prior to performing the following procedure, remove the metal cover and the rear cover. CN905 (1) Disconnect the card wires from connector CN903, CN904 Tuner board and the wire from CN905 on the main board on the upper side of the body.
Joint a Joint a Rear panel Rear panel Joint b Fig.11 Fig.8 CN902 Main board Rear panel CN908 Fig.12 Tuner board Fig.9 Joint b Rear panel Fig.10 (No.22036)1-9...
2.1.7 Removing the power amplifier board / power amplifi- Power supply board er sub board / main board / heat sink CN949 (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.
Main board Heat sink Main board CN945 CN947 Heat sink Power amplifier board CN944 CN946 Power amplifier board Fig.17 Power amplifier sub board Main board CN941 Fig.20 Main board Heat sink CN906 Fig.18 Main board Heat sink Power amplifier board Power amplifier sub board Fig.21...
2.1.11 Removing the power transformer assembly Power transformer assembly (See Fig.22, 23) • Prior to performing the following procedure, remove the metal J1000 cover, the rear cover, the CD-R mechanism assembly and the rear panel. • Remove the assembly consisting of the power amplifier board, the power amplifier sub board and the main board fromthe chassis incompletely (Refer to Fig.17).
2.1.12 Removing the front panel assembly Front panel assembly (See Fig.24, 25) • Prior to performing the following procedure, remove the metal cover, the rear cover, the CD-R mechanism assembly and the rear panel. • Remove the assembly consisting of the power amplifier board, the power amplifier sub board and the main board (Refer to Fig.17, 18).
2.1.13 Removing the display board / switch board Display board (See Fig.26 ~ 28) • Prior to performing the following procedure, remove the front Switch board panel assembly. (1) Pull out the VOLUME knob on the front panel. (2) Remove the eleven screws N on the back of the front panel and remove the display board with the switch board.
2.1.14 Removing the headphone board Front panel assembly (See Fig.29) • Prior to performing the following procedure, remove the front panel assembly. (1) Remove the screw P on the back of the front panel. (2) If necessary, remove the band bundling the wire extending from the headphone board and the display board.
Cassette mechanism assembly Head (R/P,Erase) 2.2.1 Removing the playback/recording & eraser head spring a (See Fig.1 to 3) Flexible wire (1) While shifting the trigger arm seen on the right side of the head mount in the arrow direction, turn the flywheel (R) in trigger arm counterclockwise direction until the head mount has gone out with a click (See Fig.1).
2.2.3 Removing the head amplifier & mechanism control main motor assembly board (See Fig.4 and 5) capstan belt (1) Remove the flexible wire from the connector CN31 on the head amplifier & mechanism control board on the rear of the cassette mechanism assembly. (2) Remove the three screws B retaining the head amplifier &...
2.2.5 Removing the flywheel (See Fig.8 and 9) • Prior to the following procedure, remove the head amplifier &mechanism control board. • Prior to the following procedure, remove the main motor as- sembly. (1) Remove the slit washers c and d fixing the capstan shafts (L) and (R) from the front of the cassette mechanism as- sembly.
SECTION 3 Adjustment Adjustment method Measurement Instruments Required for Tuner section Adjustment FM tuning range: 87.5MHz~108.00MHz 1. Low frequency oscillator AM tuning range: 522kHz~1,629kHz This oscillator should have a capacity to output 0dBs to 600 at an oscillation frequency of Voltage applied to tuner +B : DC5.7V 50Hz-20kHz.
Cassette mechanism section Head angle Head angle azimuth screw azimuth screw (foward) (reverse) CN31 Head angle Head angle Recording and play head/Erase head azimuth screw azimuth screw (foward) (reverse) Mechanism control P.C. board B102 R371 C376 Q375 CN32 R375 CN34 B152 D375 Q376...
Mechanism section Item Confirmation of angle of head Tape speed confirmation Mesurement Test tape: VT703L (8kHz) Test tape: VT712 (3kHz) condition Measurement output terminal: Measurement output terminal: Speaker terminal Speaker terminal or headphone terminal Mesurement 1.Test tape VT703L (8kHz) is played. Test tape VT712(3kHz) of the forward is procedure 2.It is adjusted that becomes an output...
Electric adjustment Recording reproduction Item Recording BIAS adjustment frequency characteristic Mesurement Forward or reverse Standard frequency: 1kHz/10kHz condition Test tape: AC-514 TYPE (Srandard: -20dB) AC-225 TYPE Test tape: AC-514 TYPE Measurement output terminal: Measurement input terminal: OSC IN Recording and headphone terminal Mesurement 1.Test tape (AC-514 TYPE ,AC-225 1.Test tape (AC-514 TYPE )is installed,...
Flow of functional operation until TOC read (CD) Check Point Slider turns REST Power Key Power ON Check that the voltage at the pin 5 SW ON. of CN801 is 0V? Automatic tuning of TE offset Check that the voltage at the Laser ON pin2 of IC601 is 4.4V? Detection of disc...
Maintenance of laser pickup (CD) Replacement of laser pickup (CD) (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens Turn off the power switch and, disconnect the with a alcohol soaked cotton swab. power cord from the ac outlet.
SECTION 4 Description of major ICs 4.1 AN22000A-W (IC601) : RF head amp. • Terminal layout • Pin function Symbol I/O Function I APC Amp. input terminal O APC Amp. output terminal - Power supply terminal I RF adder Amp. inverting input terminal RFOUT O RF adder Amp.
4.6 LA1838 (IC1) : FM AM IF amp & detector, FM MPX decoder • Block Diagram DECODER RF.AMP ANIT-BIRDIE MUTE BUFF STEREO P-DET AM IF PILOT 384KHz COMP S-METER AM/FM S-CLRVE S-METER IF-BUFF TUNING STEREO DRIVE DRIVE FM IF • Pin Function Pin No.
4.7 LA6541-X (IC801) : BTL driver • Pin layout & Block diagram Vref Vin4 Vin3 Level B T L B T L Level RESET shift driver driver shift Level B T L B T L Level Regulator shift driver driver shift Mute Vin1...
• Pin function Pin No. Symbol Function Serial data and clock input pin for control. Chip enable pin. Ground pin. LOPOUT Output pin of general-purpose operation amplifier. LINM Non-inverted input pin of general-purpuse operation amplifier. LINP Non-inverted input pin of general-purpuse operation amplifier. LOUT ATT + equalizer output pin.
4.10 MN662748RPMFA (IC651) : Digital servo & Digital signal processor • Pin layout 20 ~ 41 ~ • Block diagram AVSS1 LRCKIN(MSEL) 8TIMES AVDD1 BCLK(SSEL) DIGITAL OVER SAMPUNC OUTR SRDATAIN DEEMPHSIS 1BIT DIGITAL FILTER (PSEL) LOGIC IOSEL CLVS BLKCK OUTL CLDCK SBCK SUBC...
• Pin function Pin No. Symbol Function Pin No. Symbol Function RFDET RF detect signal input (L:detect) BCLK Not used BDO input pin (L:detect) LRCK Not used LDON Laser ON signal output (H:on) SRDATA Not used Tracking error shunt signal output DVDD1 Power supply (Digital) (H:shunt)
4.12 LB1641 (IC801) : DC motor driver • Pin layout • Truth table Input Output Mode OUT1 OUT2 Brake CLOCKWISE COUNTER-CLOCKWISE GND OUT1 P1 IN2 VCC1 VCC2 P2 OUT2 Brake 4.13 NJU6433FG1 (IC934) : LCD driver • Pin layoout • Pin function Symol Function 1~50 SEG1~SEG50 Segment output terminal for LCD.
4.14 UPD780055GC-045 (IC931) : Micon • Pin layout • Pin function Pin No. Symbol Function SAFETY0 Irregular voltage detection 0 REST/OP_SW/CL_SW REST/CLOSE switch detect port CD safety voltage detect port AVSS Not use Not use AVREF1 Reference voltage SUBQ/RDDA Q-code data input port Not use SQCK Q-code serial clock...
Pin No. Symbol Function Not use Not use Not use LEDRV LED indicate Reverse LEDREC LED indicate REC LEDFR LED indicate Forward STTA Tape strobe DATA LCD data MODE LCD data mode control LCD serial clock Not use PHOTO Tape end detection LCD driver inhibit ('L' at end of transmission) LCDCE LCD chip enable...