Sony HCD-GRX70 User manual

MICROFILM
SERVICE MANUAL
MINI Hi-Fi COMPONENT SYSTEM
HCD-GRX70/GRX70J/RXD80
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trade-
marks of Dolby Laboratories Licensing Corporation.
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
section in HMC-GRX70/GRX70J/RXD80.
SPECIFICATIONS
Amplifier section
Canadian model:
Continuous RMS power output (reference)
100 + 100 watts
(8 ohms at 1 kHz, 10% THD)
Total harmonic distortion less than 0.07%
(8 ohms at 1 kHz, 55 W)
Other models:
The following measured at AC 120, 220, 240 V 50/60 Hz
DIN power output (rated) 130 + 130 watts
(6 ohms at 1 kHz, DIN)
Continuous RMS power output (reference)
170 + 170 watts
(6 ohms at 1 kHz, 10% THD)
Model Name Using Similar Mechanism HCD-GRX50/RXD7
CD Mechanism Type CDM38LH-5BD32L
Base Unit Name BU-5BD32L
Optical Pick-up Name KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-GRX50/RXD7
Tape Transport Mechanism Type TCM-230AWR2
CD
Section
Tape deck
Section
Photo: HCD-GRX70 (GRAY)
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
– Continued on next page –

HCD-GRX70/GRX70J/RXD80
– 31 – – 32 –
7-7. SCHEMATIC DIAGRAM – BD Board – • See page 59 for Waveforms. •See page 64 for IC Block Diagrams.
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : CD STOP
( ) : CD PLAY
The components identified by mark !or dotted
line with mark !are critical for safety.
Replaceonlywithpartnumber specified.
Lescomposants identifiéspar une marque !sont
critiques pour la sécurité. Ne les remplacer que
par une piéce portant le numéro spécifié.
(Page 45)

HCD-GRX70/GRX70J/RXD80
– 35 – – 36 –
7-9. SCHEMATIC DIAGRAM – CD MOTOR Section – • See page 65 for IC Block Diagrams.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : CD STOP
(Page 45)
(Page 45)
DISC TRAY
ADDRESS DETECT
DISC TRAY SLIDE
CLOSE
OPEN
B
(DISC TRAY SLIDE)
DISC IN DETECT
SENSOR DISC TRAY
SENSOR
DISC
TRAY
TURN
DISC TRAY TURN
MOTOR DRIVER
LEVEL SHIFT
C

HCD-GRX70/GRX70J/RXD80
PB LEVEL (L)
(DECK A)
PB LEVEL (R)
(DECK A)
PB LEVEL (L)
(DECK B)
PB LEVEL (R)
(DECK B)
PB EQ AMP
(DECK A)
PB EQ AMP
(DECK B)
SWITCHING
REC BIAS (L)
(DECK B)
REC BIAS (R)
(DECK B)
BIAS OSC
REC BIAS
-6.8
(PLAYBACK)
D
– 39 – – 40 –
7-11. SCHEMATIC DIAGRAM – AUDIO Board – • See page 66 for IC Block Diagram.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : TAPE PLAY
( ) : RECORD
The components identified by mark !or dotted
line with mark !are critical for safety.
Replaceonly with partnumber specified.
Lescomposants identifiéspar une marque !sont
critiques pour la sécurité. Ne les remplacer que
par une piéce portant le numéro spécifié.
(Page 49)

HCD-GRX70/GRX70J/RXD80
DECK B
PLUNGER DECK A PLUNGER
(CAPSTAN)
(DECK A 120/70)
(DECK A HALF)
(DECK A REC)
(DECK B HALF)
(DECK B REC)
(DECK B 120/70)
ROTATION DETECT SENSOR
(DECK A)
ROTATION DETECT
SENSOR (DECK B)
(DECK A PLAY) (DECK B PLAY)
E
CONTROL SWITCH
– 41 – – 42 –
7-12. PRINTED WIRING BOARD – LEAF SW Board – • See page 28 for Circuit Boards Location.
7-13. SCHEMATIC DIAGRAM – LEAF SW Board –
• Voltages are dc with respect to ground under no-signal
conditions.
no mark :TAPE PLAY
( ) : RECORD
∗: Impossible to measure
Q113 E-9
Q161 C-9
Q162 C-9
Q163 E-9
Q191 E-12
Q192 E-10
Q201 D-9
Q251 C-9
Q331 C-1
Q332 C-2
Q333 C-2
Q334 C-2
Q335 D-1
Q336 F-1
Q337 F-1
Q338 F-1
Q339 F-1
Q340 E-1
Q341 E-1
Q342 F-1
Q343 E-1
Q401 F-12
Q402 E-12
Q411 G-2
Q412 G-3
Q431 G-12
Q432 G-11
Q433 F-11
Q434 F-11
Q435 F-11
Q436 F-11
Q437 G-12
Q439 F-12
Q471 F-2
Q501 D-7
Q508 D-7
Q509 E-7
Q801 H-10
Q803 G-10
Q804 G-9
Q831 G-10
Q832 G-10
Q851 J-10
Q881 I-9
Q901 H-2
Q902 I-1
Q903 H-1
Q904 G-4
Q905 G-4
Q907 G-5
Q908 G-4
Q909 I-4
Q913 H-1
Q914 G-2
Q923 H-1
Q951 G-2
Q952 H-1
Ref. No. LocationRef. No. Location
D141 E-10
D191 E-12
D331 E-1
D333 F-1
D334 E-1
D335 F-1
D401 G-11
D403 F-12
D405 H-6
D406 J-4
D407 I-2
D411 G-3
D501 D-7
D502 E-6
D503 D-6
D504 D-7
D505 D-7
D506 D-7
D509 F-2
D607 E-5
D644 C-8
D801 J-11
D802 G-9
D803 G-11
D831 I-6
D832 J-7
D851 J-10
D852 G-9
D881 H-9
D901 J-4
D902 J-4
D903 J-4
D904 I-4
D905 I-1
D906 H-1
D907 J-5
D908 I-5
D909 J-5
D910 J-5
D915 I-4
D921 H-4
D922 G-4
D923 G-4
D924 F-2
D925 G-4
IC101 C-10
IC301 B-3
IC381 A-12
IC501 D-5
IC502 D-7
IC801 H-10
IC901 G-6
IC902 G-4
IC903 H-4
Q111 D-10
Q112 D-10
• Semiconductor Location
(Page 49)
(Page 43)
05
DECK A
PLUNGER
DECK B
PLUNGER
(DECK A PLAY)
(DECK A HALF) (DECK A 120/70) (DECK A REC)
(DECK B HALF)
(DECK B PLAY)
(DECK B 120/70)
(DECK B REC)
21
21
E
4
12
34
12
3
()

HCD-GRX70/GRX70J/RXD80
– 45 – – 46 –
7-15. SCHEMATIC DIAGRAM – MAIN Board (1/4) –
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM/AM)
( ) : CD PLAY
(Page 31)
(Page 36)
(Page 36)
(Page 50)
(Page 51)
(Page 47)

HCD-GRX70/GRX70J/RXD80
– 47 – – 48 –
7-16. SCHEMATIC DIAGRAM – MAIN Board (2/4) –
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
The components identified by mark !or dotted
line with mark !are critical for safety.
Replaceonly with partnumber specified.
Lescomposants identifiéspar une marque !sont
critiques pour la sécurité. Ne les remplacer que
par une piéce portant le numéro spécifié.
(Page
46)
(Page 50)
(Page 52)
(Page 63)

HCD-GRX70/GRX70J/RXD80
– 49 – – 50 –
7-17. SCHEMATIC DIAGRAM – MAIN Board (3/4) –
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : TUNER (FM/AM)
( ) : CD PLAY
{} :TAPE PLAYBACK (DECK A)
[ ] :TAPE PLAYBACK (DECK B)
〈〈 〉〉 : RECORD
(Page 40)
(Page 42)
(Page 46)
(Page 47)
(Page 51)
(Page 63)
(Page 56)
(Page 51)

HCD-GRX70/GRX70J/RXD80
– 51 – – 52 –
7-18. SCHEMATIC DIAGRAM – MAIN Board (4/4) – • See page 59 forWaveforms.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM/AM)
( ) : CD PLAY
{} :TAPE PLAYBACK (DECK A)
[ ] :TAPE PLAYBACK (DECK B)
〈〈 〉〉 : RECOARD
uPC7812AHF
(Page
46)
(Page
50)
(Page
50)
(Page 48)

HCD-GRX70/GRX70J/RXD80
– 55 – – 56 –
7-20. SCHEMATIC DIAGRAM – PANEL Board– • See page 59 for Waveform. •See page 66 for IC Block Diagrams.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER (FM/AM)
(Page
58)
(Page 50)