Sony HCD-EX770 User manual

Sony Corporation
Home A&V Products Company
DHC-EX770MD
HCD-EX770
SERVICE MANUAL
MICROFILM
9-922-860-11
98D001648-1D
Printed in Japan ©1998.4
Published by Quality Assurance Dept.
(Shibaura)
• DHC-EX770MD is composed of following models.
As for the service manual, it is issued for each component
model, then, please refer to it.
AEP Model
UK Model
PARTS LIST (ACCESSORIES & PACKING MATERIALS)
Part No. Description
1-475-883-11 COMMANDER, STANDARD (RM-EX77)
1-501-594-11 ANTENNA (FM)
1-501-721-11 ANTENNA (LOOP)
1-769-170-21 CORD (WITH CONNECTOR) (7P) (TA-ST-MDS-CDP)
1-775-373-11 CORD, CONNECTION (0.5m) (AUDIO)
1-775-924-11 CORD, LIGHT PLUG
3-860-163-13 MANUAL, INSTRUCTION (ENGLISH, SPANISH)
3-860-163-23 MANUAL, INSTRUCTION (FRENCH, DUTCH) (AEP)
3-860-163-33 MANUAL, INSTRUCTION (GERMAN, ITALIAN) (AEP)
3-860-143-43 MANUAL, INSTRUCTION (SWEDISH, PORTUGUESE) (AEP)
4-981-643-01 COVER, BATTERY (FOR RM-EX77)
4-992-237-01 CAP (PJ) (FOR TA-EX770)
MINI Hi-Fi COMPONENT SYSTEM
HCD-EX770 is composed of TA-EX770 and CDP-EX770
COMPONENTS MODEL NAME FOR DHC-EX770MD
AMPLIFIER TA-EX770
TUNER ST-EX770
CD PLAYER CDP-EX770
MINIDISC DECK MDS-EX770

TA-EX660/EX770
AEP Model
UK Model
SERVICE MANUAL
MICROFILM
Ref. No. Part No. Description
9-922-858-11 Sony Corporation
Home A&V Products Company
INTEGRATED STEREO AMPLIFIER
98D001648-1D
Printed in Japan ©1998.4
Published by Quality Assurance Dept.
(Shibaura)
TA-EX660/EX770 is the amplifier section in MHC-EX660 and DHC-EX770MD.
The mechanical and electorical specifications of TA-EX660/EX770 is almost same as
TA-EX66/EX77 AEP/UK model.
So this manual contains only the points which differ from TA-EX66/EX77.
For the informations not contained in this manual, please refer to the TA-EX66/EX77
service manuals (9-960-931- ) previously issued.
•PARTS LIST (The difference betweenTA-EX66/EX77 andTA-EX660/770)
Page
1 4-985-925-01 KNOB(JOG)
2 X-4947-837-1 KNOB(VOL)ASSY
4 X-4948-359-1 PANEL ASSY, FRONT(EX66)
4 X-4948-436-1 PANEL ASSY, FRONT(EX77:AEP, UK)
*58 4-985-927-11 PANEL, BACK(EX77:AEP,UK)
*58 4-985-927-41 PANEL, BACK(EX66:AEP,UK)
Ref. No. Part No. Description
––––––– ––––––– –––––––––
22
TA-EX66/EX77 TA-EX660/EX770
• Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
1 4-985-925-11 KNOB(JOG)
2 X-4949-863-1 KNOB(VOL)ASSY
4 X-4949-867-1 PANEL ASSY, FRONT(EX660)
4 X-4949-862-1 PANEL ASSY, FRONT(EX770)
*58 4-985-927-61 PANEL, BACK(EX770)
*58 4-985-927-71 PANEL, BACK(EX660)
23

MICROFILM
AEP Model
UK Model
E Model
SERVICE MANUAL
TA-EX66/EX77
INTEGRATED STEREO AMPLIFIER
TA-EX66/EX77is theamplifiersection
inMHC-EX66, DHC-EX77MD/MD77.
SPECIFICATIONS
Photo:TA-EX77 (AEP, UK model)
General
Power requirements
AEP, UK model: 220 – 230V AC, 50/60 Hz
HK, SP model: 220 – 240 V AC, 50/60 Hz
Power consumption 125 watts
Design and specifications are subject to change without notice.
• Abbreviation
HK : Hong Kong
SP : Singapore
AEP, UK model:
DIN power output 45 + 45 watts (6 ohms at 1 kHz, DIN)
Continuous RMS power output
60 + 60 watts (6 ohms at 1kHz, 10% THD)
Music power output 105 + 105 watts
HK, SP model:
Continuous RMS power output
55 + 55 watts (6 ohms at 1 kHz, 5% THD)
Inputs
CD IN, MD IN (phono jacks): voltage 450 mV, impedance 47 kilohms
TUNER IN, TAPE IN, VIDEO1 IN, VIDEO2/AUX IN (TA-EX66/
EX77:AEP, UK model),VIDEO2 IN (TA-EX77: HK,SP model) (phono
jacks): voltage 250 mV, impedance 47 kilohms
MIX MIC (phone jack):
sensitivity 1 mV, impedance 10 kilohms or more
Outputs
MD OUT, TAPE OUT, VIDEO1 OUT (phono jacks):
voltage 250 mV, impedance 1 kilohm
PHONES (stereo phone jack):
accepts headphones of 6 ohms or more.
SPEAKER: accepts impedance of 6 to 16 ohms.
Dimensions (w/h/d) incl. projecting parts and controls:
Approx. 280 ×122.5 ×298 mm
Mass Approx. 5.3 kg

– 2 –
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINE WITH MARK !ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
TABLE OF CONTENTS
1. GENERAL ....................................................................3
2. DISASSEMBLY ...........................................................6
3. DIAGRAMS
3-1. IC Pin Function Description .............................................9
3-2. Schematic Diagram .........................................................14
3-3. Printed Wiring Boards .....................................................19
4. EXPLODEDVIEWS ................................................22
5. ELECTRICAL PARTS LIST .................................24
MODEL IDENTIFICATION
– BACK PANEL –
4-985-927-
TA-EX77 (AEP, UK model) : 1πCED/CEK
TA-EX77 (Singapore model) : 2πSP
TA-EX77 (Hong Kong model): 3πHK
TA-EX66 (AEP, UK model) : 4πCED/CEK
TA-EX66 (Singapore model) : 5πSP

– 3 –
SECTION 1
GENERAL This section is extracted
from instruction manual.

– 4 –

– 5 –

– 6 –
SECTION 2
DISASSEMBLY
•This set can be disassembled in the order shown below.
CONNECTOR BOARD
(Page 7)
BACK PANEL
(Page 7)
MAIN BOARD
(Page 8)
CASE, FRONT PANEL ASS’Y
(Page 6)
1 screw (BVTT3 × 8)
2 two screws
(case 3 TP2)
2 two screws
(case 3 TP2)
3 case
4 two screws
(BVTP3
× 10)
5 two legs (F)
6 three screws
(BVTP3
× 10)
7 claw
7 two claws
7 two claws
8 front panel ass’y
CASE, FRONT PANEL ASS’Y
Note: Follow the disassembly procedure in the numerical order given.

– 7 –
BACK PANEL
CONNECTOR BOARD
1 connector
(CN911)
2 connector
(CN504)
3 screw
(BVTP3
× 8)
3 three screws
(BVTP3
× 10)
3 five screws
(BVTP3
× 10)
4 claw
5 Remove the back panel to
direction of the arrow
A .
A
EX77
1
connector
(CN501)
2 Remove the connector (CN553) to
direction of the arrow
A .
3 Remove the connector (CN554) to
direction of the arrow
B .
4 Remove the connector board to
direction of the arrow
C .
A
B
C

– 8 –
MAIN BOARD
1 two screws
(BVTP3
× 16)
2 four screws
(BVTT3
× 6)
3 Remove the MAIN board to
direction of the arrow.

– 9 –
SECTION 3
DIAGRAMS
3-1. IC PIN FUNCTION DESCRIPTION
• PANEL BOARD IC101 MB89193A-157 (SYSTEM CONTROLLER)
Pin No. Pin Name I/O Function
1 MIC-IN I Plug in detection signal input of the MIX MIC jack (J201)
Insert the microphone plug with the jack when “H”
2 STANBY O Power on/off control signal output terminal “H”: power on, “L”: standby mode
3 K-PON O Control signal output to the KARAOKE PON circuit “H”: KARAOKE PON on
4 KEY0 I Key input terminal (A/D input) POWER key (S101) input
5 VSS — Ground terminal
6 RST I Power on reset signal input from the reset signal generator (IC103) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
7 XIN I System clock input terminal (4 MHz)
8 XOUT O System clock output terminal (4 MHz)
9 VSS — Ground terminal
10 AUB-OUT O Output terminal of the audio bus signal
11 AUB-IN I Input terminal of the audio bus signal
12 SIRCS-IN I Sircs signal input from the remote control receiver (IC102)
13 VOL-UP O Motor control signal output to the volume up/down motor driver IC (IC104)
“H”: volume up
14 VOL-DOWN O Motor control signal output to the volume up/down motor driver IC (IC104)
“H”: volume down
15 –20dB MUTE O Control signal output of the –20 dB mute “H”: –20 dB mute on
16 DIRECT O Control signal output to the SOURCE DIRECT circuit “H”: SOURCE DIRECT on
17 DBFB LEVEL O DBFB level select signal output terminal “H” : DBFB LOW, “L”: DBFB HIGH
18 MUTE O Control signal output of the line mute “H”: line mute on
19 KEY1 I Key input terminal (A/D input)
–20 dB MUTING, SOURCE DIRECT, KARAOKE PON, DBFB keys (S104 to S107) and rotary
encoder (S110) for the FUNCTION
20 DBFB ON/OFF O Control signal output to the DBFB circuit “H”: DBFB off, “L”: DBFB on
21 OPEN — Not used (open)
22 VSS — Ground terminal
23 VCC — Power supply terminal (+5V)
24 ANALOG/
DIGITAL IDigital/analog recording mode select input (ANALOG/DIGITAL select switch (S901) input) of
the AUX/VIDEO 2 IN terminal “H”: analog recording mode, “L”: digital recording mode
(TA-EX77 only)
25 FUNCA O
26 FUNCB O Function select signal output terminal *1
27 FUNCC O
28 VCC — Power supply terminal (+5V)
*1
TAPE “H” “H” “H”
VIDEO 2 “L” “H” “H”
VIDEO 1 “H” “L” “H”
MD “L” “L” “H”
CD “L” “H” “L”
TUNER “H” “L” “L”
Terminal
Function FUNCA
(pin @∞)FUNCB (pin @§)FUNCC (pin @¶)

– 10 –
•IC Block Diagrams
IC104 BA6208
1 2 3 4 5 6 7 89
NC
OUTPUT 2
Vcc
GND
NC
INPUT 2
INPUT 1
NC
MOTOR
DRIVE
MOTOR
DRIVE
REG
SWITCH
SWITCH
OUTPUT1
IC105 SN74HC138AN
15 14 13 12 11 10 9
8765
4
321 GNDY7
G1
G2B
G2AC
B
A
A
B C G2A Y7
G1
G2B
Y6
Y5
Y6Y5Y4Y3Y2Y1Y0
16
VCC
DATA OUTPUTS
OUTPUT
ENABLE
SELECT
Y4Y3Y2Y1Y0
IC203, 503 MC14052BCP
12 14 15 11 9
16 13 10
1 5 2 4
3 6 7 8
V DD
SELECT A
SELECT B3210 3210
INH 7 V EE V SS

– 11 –
IC701 µPC1237HA
1 2 3 4 5 6 7 8
OVER LOAD DET
F/F
OFFSET DET
LATCH/
AUTORESET
V
CC ON
MUTE
AC OFF
DET
V
CC
•Waveforms
1IC101 7(XIN)
5.5 Vp-p
4 MHz
2IC101 8(XOUT)
5.7 Vp-p
4 MHz

– 12 –
•Circuit Boards Location
PRIMARY board
SECONDARY board
PANEL board
VOL board MAIN board
SW board
(EX77)
CONNECTOR board

– 22 –
NOTE:
•-XX and -X mean standardized parts, so they
may have some difference from the original
one.
•Color Indication of Appearrance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑↑
Parts Color Cabinet's Color
•Abbreviation
HK : Hong Kong
SP : Singapore
(1) CASE, FRONT PANEL SECTION
•Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
•The mechanical parts with no reference num-
ber in the exploded views are not supplied.
•Hardware (# mark) list are given in the last of
the electrical parts list.
SECTION 4
EXPLODED VIEWS
The components identified by mark
!or dotted line with mark !are
critical for safety.
Replace only with part number
specified.
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
1 4-985-925-01 KNOB (JOG)
2 X-4947-837-1 KNOB (VOL) ASSY
3 4-985-926-01 KNOB
4 X-4947-655-1 PANEL ASSY, FRONT (EX77: SP, HK)
4 X-4948-359-1 PANEL ASSY, FRONT (EX66)
4 X-4948-436-1 PANEL ASSY, FRONT (EX77: AEP, UK)
5 4-985-922-01 RING, ORNAMENTAL
6 4-962-708-01 EMBLEM (4-A), SONY
7 4-985-918-01 INDICATOR (POWER)
8 4-985-917-01 BUTTON (POWER)
9 4-985-920-01 INDICATOR (6)
*10 A-4398-059-A PANEL BOARD, COMPLETE (AEP, UK)
*10 A-4398-061-A PANEL BOARD, COMPLETE (SP, HK)
11 4-951-620-01 SCREW (2.6X8), +BVTP
12 4-977-699-11 LEG (F)
*13 1-665-663-11 VOL BOARD
14 3-363-099-01 SCREW (CASE 3 TP2)
15 4-978-245-11 CASE
1
2
3
4
5
6
7
8
9
10
12
13 14
15
#1
supplied with J201
supplied
with RV204
not supplied
not supplied
11
11
#1
#2
14

– 23 –
(2) MAIN SECTION
Ref. No. Part No. Description Remark
The components identified by mark
!or dotted line with mark !are
critical for safety.
Replace only with part number
specified.
Ref. No. Part No. Description Remark
*51 1-663-932-11 CONNECTOR BOARD
*52 1-665-662-11 SECONDARY BOARD
*53 1-665-661-11 PRIMARY BOARD
*54 A-4398-060-A MAIN BOARD, COMPLETE (EX77: AEP, UK)
*54 A-4398-062-A MAIN BOARD, COMPLETE (EX77: HK, SP)
*54 A-4403-012-A MAIN BOARD, COMPLETE (EX66: SP)
*54 A-4403-013-A MAIN BOARD, COMPLETE (EX66: AEP, UK)
*55 3-703-244-00 BUSHING (2104), CORD
!56 1-575-651-11 CORD, POWER (AEP, HK, SP)
!56 1-696-570-21 CORD, POWER (UK)
*57 4-949-235-01 HOOK (AEP, SP)
*58 4-985-927-11 PANEL, BACK (EX77: AEP, UK)
*58 4-985-927-21 PANEL, BACK (EX77: SP)
*58 4-985-927-31 PANEL, BACK (EX77: HK)
*58 4-985-927-41 PANEL, BACK (EX66: AEP, UK)
*58 4-985-927-51 PANEL, BACK (EX66: SP)
*59 1-663-933-11 SW BOARD (EX77)
60 4-965-822-01 FOOT
!61 1-569-008-11 ADAPTOR, CONVERSION 2P (SP)
!62 1-770-019-11 ADAPTOR, CONVERSION PLUG 3P (HK)
63 4-956-370-02 BAND, PLUG FIXED (UK, HK)
!T901 1-431-301-11 TRANSFORMER, POWER
51
52
53 54
55
56
58
59
60
61
62
63
HK
AEP, HK, SP
UK
56
AEP, SP UK, HK
57
EX77
not supplied
not
supplied
not supplied
T901
#3
#4
#5
#3
#3
#1
#4
#1
#4
SP

– 24 –
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
NOTE:
•Due to standardization, replacements in the
parts list may be different from the parts speci-
fied in the diagrams or the components used on
the set.
•-XX and -X mean standardized parts, so they
mayhavesomedifferencefrom the original one.
•RESISTORS
All resistors are in ohms.
METAL: Metal-film resistor.
METAL OXIDE: Metal oxide-film resistor.
F: nonflammable
•Abbreviation
HK : Hong Kong
SP : Singapore
•Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when order-
ing these items.
•SEMICONDUCTORS
In each case, u: µ, for example:
uA. . : µA. . uPA. . : µPA. .
uPB. . : µPB. . uPC. . : µPC. .
uPD. . : µPD. .
•CAPACITORS
uF: µF
•COILS
uH: µH
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
*1-663-932-11 CONNECTOR BOARD
*****************
< CAPACITOR >
C821 1-136-153-00 FILM 0.01uF 5% 50V
C831 1-136-153-00 FILM 0.01uF 5% 50V
< CONNECTOR >
*CN531 1-569-499-11 PIN, CONNECTOR 3P
CN541 1-770-966-11 PIN, CONNECTOR (PCB) (V TYPE) 6P
CN552 1-764-325-11 PIN, CONNECTOR (PCB) (V TYPE) 2P (EX77)
*CN553 1-569-504-11 PIN, CONNECTOR 9P
< DIODE >
D808 8-719-023-05 DIODE 11E2-TA2B
D818 8-719-023-05 DIODE 11E2-TA2B
************************************************************
*A-4403-012-A MAIN BOARD, COMPLETE (EX66: SP)
*A-4403-013-A MAIN BOARD, COMPLETE (EX66: AEP, UK)
*A-4398-060-A MAIN BOARD, COMPLETE (EX77: AEP, UK)
*A-4398-062-A MAIN BOARD, COMPLETE (EX77: HK, SP)
*********************
*4-942-204-01 PLATE, GROUND
7-685-871-01 SCREW +BVTT 3X6 (S)
< CAPACITOR >
C301 1-126-045-11 ELECT 2.2uF 20% 50V
C302 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C303 1-162-282-31 CERAMIC 100PF 10% 50V
C304 1-126-868-11 ELECT 47uF 20% 50V
C305 1-126-868-11 ELECT 47uF 20% 50V
C306 1-124-122-11 ELECT 100uF 20% 50V
C307 1-126-059-11 ELECT 10uF 20% 50V
C308 1-126-233-11 ELECT 22uF 20% 50V
C309 1-164-159-11 CERAMIC 0.1uF 50V
C310 1-136-163-00 FILM 0.068uF 5% 50V
C311 1-136-163-00 FILM 0.068uF 5% 50V
C312 1-126-868-11 ELECT 47uF 20% 50V
C318 1-162-200-31 CERAMIC 11PF 5% 50V
(AEP, UK)
C331 1-162-306-11 CERAMIC 0.01uF 20% 16V
(AEP, UK)
C340 1-126-059-11 ELECT 10uF 20% 50V
C351 1-126-045-11 ELECT 2.2uF 20% 50V
C352 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C353 1-162-282-31 CERAMIC 100PF 10% 50V
C354 1-126-868-11 ELECT 47uF 20% 50V
C355 1-126-868-11 ELECT 47uF 20% 50V
C356 1-124-122-11 ELECT 100uF 20% 50V
C357 1-126-059-11 ELECT 10uF 20% 50V
C358 1-162-200-31 CERAMIC 11PF 5% 50V
(AEP, UK)
C360 1-136-163-00 FILM 0.068uF 5% 50V
C361 1-136-163-00 FILM 0.068uF 5% 50V
C401 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK)
C402 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK)
C403 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK)
C451 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK)
C452 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK)
C453 1-164-159-11 CERAMIC 0.1uF 50V
(AEP, UK)
C501 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C502 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C503 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C504 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C505 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C506 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C507 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C508 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C509 1-162-286-31 CERAMIC 220PF 10% 50V
(AEP, UK)
C510 1-162-282-31 CERAMIC 100PF 10% 50V
C531 1-162-306-11 CERAMIC 0.01uF 20% 16V
C532 1-162-306-11 CERAMIC 0.01uF 20% 16V
C533 1-162-306-11 CERAMIC 0.01uF 20% 16V
C534 1-162-306-11 CERAMIC 0.01uF 20% 16V
SECTION 5
ELECTRICAL PARTS LIST
The components identified by mark
!or dotted line with mark !are
critical for safety.
Replace only with part number
specified.
When indicating parts by reference
number, please include the board.
CONNECTOR MAIN