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WX-C55
SERVICE MANUAL
US Model E Model
Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation. "DOLBY" and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism CD Section TC Section CD Drive Mechanism Type Optical Pick-up Name Model Name Using Similar Mechanism Tape Transport Mechanism Type
NEW MG-378X-121 KSS-521A XR-C8820 MG-25E-136
SPECIFICATIONS
AUDIO POWER SPECIFICATIONS (US Model) POWER OUTPUT AND TOTAL HARMONIC DISTORTION 13 watts per channel minimum continuous average power into 4 ohms, 4 channels driven from 20 Hz to 20 kHz with no more than 1% total harmonic distortion. Other Specifications CD player section
Signal-to-noise ratio 94 dB Frequency response 5 20,000 Hz Wow and flutter Below measurable limit Laser Diode Properties Material GaAlAs Wavelength 780 nm Emission Duration Continuous Laser output power Less than 44.6 µW* * This output is the value measured at a distance of 200 mm from the objective lens surface on the Optical Pick-up Block.
Tuner section
FM Tuning range US model: 87.5 107.9 MHz E model: FM tuning interval: 50 kHz/200 kHz switchable 87.5 108.0 MHz (at 50 kHz step) 87.5 107.9 MHz (at 200 kHz step) Antenna terminal External antenna connector Intermediate frequency 10.7 MHz Usable sensitivity 9 dBf Selectivity 75 dB at 400 kHz Signal-to-noise ratio 65 dB (stereo), 68 dB (mono) Harmonic distortion at 1 kHz 0.7% (stereo), 0.4% (mono) Separation 35 dB at 1 kHz Frequency response 30 15,000 Hz
Cassette player section
Tape track 4-track 2-channel stereo Wow and flutter 0.08 % (WRMS) Frequency response 30 20,000 Hz Signal-to-noise ratio Cassette type Dolby B NR Dolby NR off TYPE II, IV 67 dB 58 dB TYPE I 64 dB 55 dB
Continued on next page
CHANGER CONTROL AUDIO MASTER
MICROFILM
1
SECTION 6 DIAGRAMS
6-1. IC PIN DESCRIPTIONS · IC500 µPD78058GC-B51-8BT (SYSTEM CONTROL)
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44, 45 46 47, 48 49 50 51 52 53 Pin Name VSM NIL SD-IN AVSS FM-ST AM-ST AVREF PLL-SI PLL-SO PLL-CKO PLL-CE AMS PLAY/AMS F/R MTL BUS-SI BUS-SO BUS-CKI BUS-CKO TAPE-MUTE DOLON EQ-CE EQ-CLK DATA VOL-CLK VOL-CE MUT AMP-ON AUX-MUT C/B PWR-SEL TEST VSS NIL POWER-ON TUN-ON FM-ON AM-ON NIL CM-ON TP-ON LM-EJ LM-LOD POS1, 0 BEEP POS2, 3 REL RC-IN1 SUB-CE SUB-DATA SUB-CLK I/O I I I -- I I -- I O O O I O O O I O I O O I/O O O O O O O O O I/O I I -- I O O O O I O O O O I O I I I O O O Pin Description FM, AM common signal meter A/D conversion input Not used. (Connect to ground in this set.) Station detecter input ("H" : with SD) Analog ground FM stereo input pin ("L" : stereo) AM stereo input pin ("L" : stereo) Reference power supply for D/A conversion. PLL serial data input PLL serial data output PLL serial clock output PLL serial chip enable output Music with/without detection input at AMS. ("L" : with music, "H" : without music) Tape AMS control output FWD/REV detection output ("H" : FWD, "L" : REV) Metal control output ("H" : metal) Uni-link serial interface data input Uni-link serial interface data output Uni-link serial interface clock input Uni-link serial interface clock output Tape mute control output Dolby control input/output Equalizer serial chip enable output (Not used in this set.) Equalizer serial clock output (Not used in this set.) Serial data output Electronic volume serial clock output Electronic volume serial chip enable output System mute control output Power amplifier power supply control output AUX mute control output Dolby B/C select control output (Not used in this set.) Power select initial setting input Test mode setting input Ground Not used. (Connect to ground in this set.) System power supply control output Tuner power supply control output FM power supply control output AM power supply control output (Not used in this set.) Not used. (Connect to ground in this set.) Capstan motor control output Tape power supply control output Loading motor control output (Eject direction) Loading motor control output (Loading direction) Position signal detection input 1, 0 Buzzer control output Position signal detection input 2, 3 Reel stand rotation detection input Rotary commander A/D conversion input 1 Sub serial chip enable output (Not used in this set.) Sub serial data output (Not used in this set.) Sub serial clock output (Not used in this set.)
25
Pin No. 54 55 56, 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76, 77 78 79 80
Pin Name SYS-RST BUS-ON RE1, 0 AD-ON RAMBU RESET SIRCS BU-IN NIL ACC-IN DIMMER TEL-MUTE KEY-ACK VDD X2 X1 IC XT2 XT1 AVDD AVREF KEY-IN0, 1 KEY-IN2 RC-IN0 DSTSEL
I/O O O I O I -- I I -- I I I I -- O I -- O I -- -- I I I I System reset signal output Bus ON control output Rotary encoder input 1, 0
Pin Description
Power supply output for A/D conversion. RAM reset detection input Reset input Remote control input (Not used in this set.) Backup power detection input Not used (Connect to ground in this set.) Accessory power supply detection input Dimmer control input Telephone mute control input Key input acknowledge µ-con power supply Main ceramic oscillator output (5 MHz) Main ceramic oscillator input (5 MHz) Connect to ground in this set. Sub crystal oscillator output (32.768 kHz) Sub crystal oscillator input (32.768 kHz) Power supply for A/D conversion. Reference power supply for A/D conversion. Key input 0, 1 Key input 2 (Not used in this set.) Rotary commander A/D conversion input 0 Initial setting input of destination. ("H" : US model, "L" : E model)
26
· IC801 µPD78054GC-A32-8BT (CD SYSTEM CONTROL)
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31, 32 33 34 35 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 Pin Name LEDCLK LEDCKO LEDSO AVSS FL-CE0 FL-CE1 AVREF1 FL-RST FL-SO FL-CKO SRDT NCO SCLK FL-BLK NIL UNISI UNISO UNICKI LINKOFF ILLON CMDON CD-ON SP-SEL SP-C SP-B SP-A CDMUT EMPH-O CD-RST XMODE NIL VSS TBTGSEL NIL GFS SQ-SI SQ-CKO NIL CD-SO CD-LAT CD-CKO PH2 F-OK LD-ON D-SW PH1 L-SW LM-LOD LM-EJ PH3 CTL1 NCO I/O -- -- -- -- O O -- O O O -- -- -- O -- I O I O O O O O O O O O O O -- -- -- I -- I I O -- O O O I I O I I I O O I O -- Pin Description Not used in this set. Not used in this set. Not used in this set. Analog ground Display driver chip select output 0 Display driver chip select output 1 (Not used in this set.) Reference power supply for D/A conversion. Display driver reset output (Not used in this set.) Display driver data output Display driver clock output Not used in this set. Not used. Not used in this set. Display driver blank control output Not used. (Connect to ground in this set.) Uni-link serial interface data input Uni-link serial interface data output Uni-link serial interface clock input Link off output Illumination power supply control output CD mechanism power supply control output CD power supply control output Signal (L/R channel) select control signal output to spectrum analyzer control IC. Frequency select control signal output to spectrum analyzer control IC. Frequency select control signal output to spectrum analyzer control IC. Frequency select control signal output to spectrum analyzer control IC. CD mute control output Emphasis control output CD signal process IC reset output Not used in this set. Not used. (Connect to ground in this set.) Ground CD tracking balance, tracking gain auto adjustment select input. Not used. (Connect to ground in this set.) GFS signal detection input SUB Q data input SUB Q clock output Not used. (Connect to ground in this set.) CD signal process serial data output CD signal process latch output CD signal process serial clock output 8/12 cm disc detection input Focus signal detection input Laser on/off select control output Down switch detection input Disc insert detection input Sled limit switch input Loading motor control output (Loading direction) Loading motor control output (Eject direction) Disc detect sensor input Driver IC control output Not used.
27
Pin No. 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
Pin Name EESIO EECKO RESET SCOR CNIN SELF-SW SENS DQSY BUIN BUSON VDD X2 X1 IC XT2 XT1 AVDD AVREF NIL SP-IN TSTIN0 NCO LEDOE
I/O O O -- I I I I -- I I -- O I -- O I -- -- -- I I -- --
Pin Description Not used in this set. Not used in this set. Reset input SCOR signal detection input Track jump count input Disc self store detection input SENS signal detection input Not used in this set. Backup power supply detection input Bus on control input µ-con power supply Main ceramic oscillator output (5 MHz) Main ceramic oscillator input (5 MHz) Not used. (Not used in this set.) Sub crystal oscillator output (Not used in this set.) Sub crystal oscillator input (Connect to ground in this set.) Power supply for A/D conversion. Reference power supply for A/D conversion. Not used. (Connect to ground in this set.) Spectrum analyzer control signal input from spectrum analyzer control IC. LOAD/EJECT prohibition setting input Not used. Not used in this set.
28
WX-C55
6-7. SCHEMATIC DIAGRAM -- CD MECHANISM SECTION (1/2) -- · Refer to page 35 for Waveforms and page 48 for IC Block Diagrams.
Note: · Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : CD PLAY : Impossible to measure
34
34
(Page 35)
WX-C55
6-8. SCHEMATIC DIAGRAM -- CD MECHANISM SECTION (2/2) -- · Refer to page 48 for IC Block Diagrams.
· Waveforms
(MODE : CD PLAY)
1
0V Approx. 620mVp-p
IC2
1
(FEO)
2
1.2Vp-p
IC2
#¡
(RFO)
3
0V Approx. 200mVp-p
IC2
$TM
(TEO)
4
2.6Vp-p 7.6µsec
IC1
(Page 34)
3
(MDP)
5
5.8Vp-p 22.7µsec
IC1
@º
(LRCK)
6
5.7Vp-p 474nsec
(Page 37)
IC1
@TM
(BCK)
7
3.2Vp-p
16.89MHz
IC1
#¢
(XTAI)
Note: · Voltage and waveforms are dc with respect to ground under no-signal conditions. no mark : CD PLAY
35
35
WX-C55
6-12. SCHEMATIC DIAGRAM -- CD SECTION -- · Refer to page 51 for IC Block Diagrams.
(Page 41)
(Page 36)
(Page 36)
(Page 41)
(Page 35) (Page 46)
Note: · Voltage is dc with respect to ground under no-signal condition. no mark : CD PLAY
37
37
WX-C55
6-14. SCHEMATIC DIAGRAM -- MAIN SECTION (1/4) -- · Refer to page 50 for IC Block Diagrams.
(Page 42)
Note: · Voltage is dc with respect to ground under no-signal condition. no mark : FM ( ) : AM
40
40
(Page 41)
WX-C55
6-15. SCHEMATIC DIAGRAM -- MAIN SECTION (2/4) --
(Page 37)
(Page 40)
(Page 37)
(Page 42)
(Page 43)
Note: · Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM
41
41
WX-C55
6-16. SCHEMATIC DIAGRAM -- MAIN SECTION (3/4) -- · Refer to page 50 for IC Block Diagrams.
(Page 40)
(Page 41)
Note: · Voltage is dc with respect to ground under no-signal condition. no mark : FM ( ) : TAPE PLAY
42
42
(Page 43)
WX-C55
6-17. SCHEMATIC DIAGRAM -- MAIN SECTION (4/4) -- · Refer to page 50 for IC Block Diagrams.
(Page 41)
(Page 47)
(Page 42)
(Page 46)
Note: · Voltage is dc with respect to ground under no-signal condition. no mark : FM ( ) : AM
43
43
WX-C55
6-19. SCHEMATIC DIAGRAM -- CONTROL SECTION --
(Page 37)
(Page 43)
Note: · Voltage is dc with respect to ground under no-signal (detuned) condition. no mark : FM
46
46
WX-C55
6-20. PRINTED WIRING BOARD -- JOG SECTION --
(Page 39)
6-21. SCHEMATIC DIAGRAM -- JOG SECTION --
(Page 43)
47
· IC Block Diagrams IC1 CXD2507AQ (SERVO BOARD)
XLON SPOD SPOC SPOB SPOA CLKO VDD XLTO DATO CNIN SEIN CLOK XLAT
64 63 62 61 60 59 58 57 56 55 54 53 52
FOK MON MDP MDS LOCK TEST FILO FILI PCO VSS AVSS CLTV AVDD
1 2 3 4 5 6 7 8 9 10 11 12 13
SERVO AUTO SEQUENCER
5
14
CPU INTERFACE
SUB CODE PROCESSOR 4 DIGITAL CLV
DIGITAL PLL
EFM DEMODULATOR
51 50 49 48 47 46 45 44 43 42 41 40
DATA XRST SENS MUTE SQCK SQSO EXCK SBSO SCOR VSS WFCK EMPH
3 ASYMMETRY CORRECTOR 5 D/A INTERFACE DIGITAL OUT 39 DOUT 38 37 36 35 34 C4M FSTT XTSL XTAO XTAI
16K RAM
ERROR CORRECTOR 3
6
CLOCK GENERATOR
RF BIAS ASYI ASYO ASYE
14 15 16 17 18
WDCK 19
33 MNTO
20 21 22 23 24 25 26 27 28 29 30 31 32
IC3 BA6796FP-T1
OP IN OP IN + CH3-IN CH2-IN CH1-IN CH1 + CH1 VREF CH3 CH2 CH2 + CH2 VCC CH1
28
27
26
LRCK PCMD BCLK
25
GTOP XUGF XPCK VDD GFS RFCK C2PO XROF MNT3 MNT1
24
23
22
21
20
19
18
17
16
15
LEVEL SHIFT
VCC LEVEL SHIFT
DRIVE BUFFER
DRIVE BUFFER
DRIVE BUFFER
DRIVE BUFFER
LEVEL SHIFT
THERMAL SHUT DOWN
LEVEL SHIFT
LOGIC CTL1 CTL2 FWD REV
V/I
DRIVE BUFFER
DRIVE BUFFER
DRIVE BUFFER
DRIVE BUFFER
DRIVE BUFFER
1
OPOUT
2
CH4-IN
3
CH4
4
CTL1
5
CTL2
6
FWD
7
REV
8
TRAY
9
GND
10
CH5
11
COM
12
CH4 +
13
CH3 +
14
CH3
48
IC2 CXA1782BQ
PHD 2 PHD 1 RF M RF O PHD RF I CC1 CC2 IIL DFCT TTL 23 C.OUT FOK LD CP CB 28
36
35
34
33
32
31
30
29
27 26 25
APC
LEVEL S
FOK
MIRR RF IV AMP1
24
SENS
TTL RF IV AMP2 FE BIAS 37 TTL IIL DATA REGISTER INPUT SHIFT REGISTER ADDRESS DECODER
22 21 20
XRST DATA XLT CLK
FE AMP
IIL IIL OUTPUT DECODER 19
F
38 F IV AMP TOG1-3 BAL1-3 FZC COMP FS1-4 TG1-2 TM1-7 PS1-4
E
39
18
VCC
E IV AMP EI 40 TE AMP BAL1 BAL 3 BAL2 TRACKING PHASE COMPENSATION TG1 TM6 16 TOG1 TOG2 TOG3 TM5 TM4 TZC COMP FCS PHASE COMPENSATION TM3 WINDOW COMP ATSC DFCT DFCT TM1 FS2 FS1 TM7 13 TA O TM2 14 SL P 15 SL O SL M
HPF COMP VEE
LPF COMP
ISET
17
ISET
41
TED 42
LPFI 43 TEI 44
ATSC 45 TZC 46
TDFCT 47 TG2
VC
48
FS4
1 FEO
2 FEI
3 FDFCT
4 FGD
5 FLB
6 FE O
7 FE M
8 SRCH
9 TGU
10 TG2
11 FSET
F SET
12 TA M
49
IC1 BU2624FV (MAIN BOARD)
20 XOUT 19 VSS PHASE DET XIN 1 REFERENCE DIVIDER MAIN COUNT CE CK DA CD 2 4 5 6 IF COUNT CTL P0 7 14 P2 I/O CTL SHIFT REGISTER LATCH 15 AMIN PRESCALER 18 PD 17 VDD 16 FMIN
A IN 2 A IN+ 3 VEE 4 A OUT 1 + B + 6 B IN 5 B IN+ A 8 VCC 7 B OUT
IC331, 341 NJM4558M
P1
9
20BIT COUNT
13 IFIN
P3 10
12 SD 11 P4
IC300 CXA2510AQ
LINEOUT1 TAPEIN1 PBOUT1 AUXIN1 PBEQ1 MSSW DIREF
TCH1
GND
30
29
28 27
26
25
24
23 22 21
NC
IC620 BA8270F
T2 + PBFB1 31 PBRIN1 32 PBREF1 33 PBFIN1 34 F2 TAPE EQ FWD/RVS VCT 35 PBGND 36 VCT + PBFIN2 37 PBREF2 38 PBRIN2 39 PBFB2 40 T1 120µ/ 70µ 1 PBEQ2 2 PBOUT2 3 VCC 4 5 TAPEIN2 AUXIN2 6 MSLPF 7 LINEOUT2 + + OFF/B NR 8 9 10 TCH2 NC PLAY F1 F3 X1 13 DGND LPF VCC + NR MODE NR BIAS X1 TAPE/AUX MS MODE + OFF/B 120µ/ 70µ NR
20 MSMODE 19 DRSW 18 TAPESW 17 INSW 16 NRSW
BUS ON 1
BUS ON SWITCH RESET SWITCH BATTERY SWITCH
14 VCC
RST 2
BATT 3
13 12 11 10
RST BUS ON CLK IN BU IN
MS ON/ 15 NC OFF DETECT 14 MSOUT
CLK 4 VREF 5 DATA 6 GND 7
9 DATA IN 8 DATA OUT
12 MSTC 11 FF
50
IC350 LC75374E
LTOUT LSIN NC LVRIN LCOM NC LSB1 LT1 LT2 LT3 LSB2
23 22 LFIN + + + + + 21 LFOUT
33
32
31 30
29
28 27 26 25 24
DECODER
LATCH
1
2
3 4
5
6 7 8 9 10
11
RVRIN
RCOM
RTOUT RSIN NC NC RSB1
RSB2
RT1 RT2
RT3
IC401 PCM1717E-ST2
XTI DGND VDD 1 2 3 INPUT INTERFACE 18 ML/MUTE MODE CONT ROL 17 MC/DM1 16 MD/DM0 15 RSTB 14 MODE NOISE SHAPER 5LEVE DAC LOWPASS FILTER CMOS AMP 5LEVEL DAC LOWPASS FILTER CMOS AMP CLK CONTROL 20 XTO 19 CLKO
CD
5
LRCIN 4 DIN BCKIN ZERO 5 6 7
VREF +
DIGITAL FILTER
1
OUT
2
VDD
NC
D/C R
8
13 D/C L 12 VOUTL 11 VCC
VOUTR 9 AGND 10
IC600 LB1930M
VCC 1 NC 2 IN1 3 IN2 4 BUFFER S-GND 5 6 P-GND 10 NC BUFFER CONTROL CIRCUIT MOTOR DRIVE CIRCUIT 9 OUT1 8 NC 7 OUT2
GND
+
R1 R2 R3 R4 RSELO
40 41 42 43 44
+
+
+
+
VDD 39
+
LSELO L4 L3 L2 L1
34 35 36 37 38
+ +
20 LROUT
19 VREF CONTROL 18 CE 17 DI 16 CL 15 VSS 14 RROUT
+
+ SHIFT REGISTER +
13 RFOUT 12 RFIN
IC502 RN5VD23AA-TL
4
3
51
IC802 BA3834F
AOUT TEST NC GND SEL NC C
18
17 MULTIPLEXER
16 15
14 13 12 11 10 DECODER
REGISTER PEAK HOLD 68Hz B.P.F. PEAK HOLD 170Hz B.P.F.
REGISTER PEAK HOLD 420Hz B.P.F.
REGISTER PEAK HOLD 1kHz B.P.F.
REGISTER PEAK HOLD 2.4kHz B.P.F.
REGISTER PEAK HOLD 5.9kHz B.P.F.
REGISTER PEAK HOLD
B A
REGISTER 14.4kHz B.P.F.
DIFFERENTIAL AMPLIFIER 1 2 3 4 5 6 7 8 9
DIFOUT
BIASC VREFC RREF NC
CIN AIN
REGULATOR OVER VOLTAGE PROTECT
NC
IC680 BA3918-V2
VCC
1
2 3 4
5
6
7
8
9
10
11
MODE2 MODE1 STB
VDD
NC
AMP
VCC
COM
52
GND
ANT
AM
FM
+ 12
+
+
+