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HCD-GRX70/GRX70J/RXD80
SERVICE MANUAL
HCD-GRX70/GRX70J/RXD80 are the Am-
plifier, CD player, Tape Deck and Tuner
section in HMC-GRX70/GRX70J/RXD80.
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol a are trade-
marks of Dolby Laboratories Licensing Corporation.
Amplifier section
Canadian model:
Continuous RMS power output (reference)
Total harmonic distortion less than 0.07%
Other models:
The following measured at AC 120, 220, 240 V 50/60 Hz
DIN power output (rated)
Continuous RMS power output (reference)
MICROFILM
Photo: HCD-GRX70 (GRAY)
CD
Section
Tape deck
Section
SPECIFICATIONS
100 + 100 watts
(8 ohms at 1 kHz, 10% THD)
(8 ohms at 1 kHz, 55 W)
130 + 130 watts
(6 ohms at 1 kHz, DIN)
170 + 170 watts
(6 ohms at 1 kHz, 10% THD)
Model Name Using Similar Mechanism
CD Mechanism Type
Base Unit Name
Optical Pick-up Name
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
Inputs
MD/VIDEO (AUDIO) IN:
voltage 450 mV/250 mV,
(phono jacks)
impedance 47 kilohms
MIX MIC: (phone jack)
sensitivity 1 mV, impedance 10
kilohms
Outputs
MD OUT:
voltage 250 mV,
(phono jacks)
impedance 1 kilohms
PHONES:
accepts headphones of 8 ohms
(stereo mini jack)
or more
SPEAKER:
Canadian model:
accepts impedance of 8 to 16 ohms
SURROUND SPEAKER (GRX70/GRX70J):
accepts impedance of 16 ohms
SUPER WOOFER:
Voltage 1 V, impedance 1 kilohm
MINI Hi-Fi COMPONENT SYSTEM
Canadian Model
HCD-RXD80
E Model
HCD-GRX70/GRX70J
Australian Model
HCD-GRX70
HCD-GRX50/RXD7
CDM38LH-5BD32L
BU-5BD32L
KSS-213D/Q-NP
HCD-GRX50/RXD7
TCM-230AWR2
– Continued on next page –
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Summary of Contents for Sony HCD-GRX70
- Page 1 SERVICE MANUAL Canadian Model HCD-RXD80 E Model HCD-GRX70/GRX70J Australian Model HCD-GRX70 HCD-GRX70/GRX70J/RXD80 are the Am- plifier, CD player, Tape Deck and Tuner Photo: HCD-GRX70 (GRAY) section in HMC-GRX70/GRX70J/RXD80. Dolby noise reduction manufactured under license Model Name Using Similar Mechanism HCD-GRX50/RXD7 from Dolby Laboratories Licensing Corporation.
- Page 2 HCD-GRX70/GRX70J/RXD80 7-7. SCHEMATIC DIAGRAM – BD Board – • See page 59 for Waveforms. • See page 64 for IC Block Diagrams. (Page 45) • Voltages and waveforms are dc with respect to ground The components identified by mark ! or dotted Les composants identifiés par une marque ! sont...
- Page 3 HCD-GRX70/GRX70J/RXD80 7-9. SCHEMATIC DIAGRAM – CD MOTOR Section – • See page 65 for IC Block Diagrams. DISC TRAY ADDRESS DETECT DISC TRAY SLIDE CLOSE OPEN (Page 45) (DISC TRAY SLIDE) DISC TRAY TURN DISC IN DETECT DISC TRAY SENSOR...
- Page 4 HCD-GRX70/GRX70J/RXD80 7-11. SCHEMATIC DIAGRAM – AUDIO Board – • See page 66 for IC Block Diagram. PB EQ AMP (PLAYBACK) (DECK A) PB LEVEL (L) (DECK A) PB LEVEL (R) (DECK A) PB EQ AMP (DECK B) PB LEVEL (L)
- Page 5 HCD-GRX70/GRX70J/RXD80 7-12. PRINTED WIRING BOARD – LEAF SW Board – • See page 28 for Circuit Boards Location. • Semiconductor Location DECK B Ref. No. Location Ref. No. Location DECK A PLUNGER PLUNGER Q113 D141 E-10 D191 E-12 Q161 D331...
- Page 6 HCD-GRX70/GRX70J/RXD80 7-15. SCHEMATIC DIAGRAM – MAIN Board (1/4) – (Page 47) (Page 31) (Page 36) (Page 51) (Page 36) (Page 50) • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) ) : CD PLAY –...
- Page 7 HCD-GRX70/GRX70J/RXD80 7-16. SCHEMATIC DIAGRAM – MAIN Board (2/4) – (Page (Page 63) (Page 50) (Page 52) • Voltages are dc with respect to ground under no-signal The components identified by mark ! or dotted Les composants identifiés par une marque ! sont (detuned) conditions.
- Page 8 HCD-GRX70/GRX70J/RXD80 7-17. SCHEMATIC DIAGRAM – MAIN Board (3/4) – (Page 46) (Page 47) (Page 51) (Page 63) (Page 56) (Page 51) (Page 40) (Page 42) • Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM)
- Page 9 HCD-GRX70/GRX70J/RXD80 7-18. SCHEMATIC DIAGRAM – MAIN Board (4/4) – • See page 59 for Waveforms. (Page 48) (Page (Page (Page uPC7812AHF • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM)
- Page 10 HCD-GRX70/GRX70J/RXD80 7-20. SCHEMATIC DIAGRAM – PANEL Board– • See page 59 for Waveform. • See page 66 for IC Block Diagrams. (Page (Page 50) • Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) –...
- Page 11 HCD-GRX70/GRX70J/RXD80 7-21. PRINTED WIRING BOARD – CD SW Board – • See page 28 for Circuit Boards Location. 7-22. SCHEMATIC DIAGRAM – CD SW Board – (Page 55) (Page 54) – 57 – – 58 –...
- Page 12 • Waveforms – BD Board – – MAIN Board – 1 IC101 ^¶ (XTAO) 5 IC101 @§ (MDP) 1 IC501 0 (XC-IN) 2.5 Vp-p 1.8 Vp-p 3.1 Vp-p 16.9344 MHz 32.768 kHz 7.8 µ s 2 IC101 %¡ (RF AC) (CD Play Mode) 6 IC102 !§...
- Page 13 HCD-GRX70/GRX70J/RXD80 7-24. SCHEMATIC DIAGRAM – TRANSFORMER Section – (Page 48) (Page 50) (Page • Voltages are dc with respect to ground under no-signal (detuned) conditions. no mark : TUNER (FM/AM) The components identified by mark ! or dotted Les composants identifiés par une marque ! sont line with mark ! are critical for safety.
- Page 14 • IC Block Diagrams – BD Board – IC101 CXD2587Q ERROR DIGITAL CORRECTOR DIGITAL ASYMMETRY CORRECTION OPERATIONAL LRCK AMPLIFIER ANALOG SWITCH PCMD INTERFACE DEMODULATOR CONVERTER EMPH XVDD XTAI TIMING CLOCK XTAO LOGIC XTSL GENERATOR XVSS TES1 AVDD1 TEST AOUT1 SERVO DSP PWM GENERATOR AIN1 FRDR...
- Page 15 IC103 CXA2568M-T6 HOLD APC PD AMP LC/PD APC LD AMP – LD ON – – – HOLD SW AGC CONT AGC VTH 50µA RF BOT – – – – RFTC RF SUMMING AMP RF EQ AMP RF I RF O –...
- Page 16 – AUDIO Board – IC602 µPC1330HA INVERTER COMPARATER SW P1 CONT GND SW P2 GND SW R1 GND SW R2 – PANEL Board – IC603 BA3830F IC604 NJU3716M-T2 RESET RESET 18 17 16 15 14 13 REFERENCE CURRENT REFERENCE CURRENT CONTROL LINE NF CIRCUIT...