Sony HCD-EP505 User manual

SERVICE MANUAL
COMPACT DISC DECK RECEIVER
US Model
Canadian Model
AEP Model
UK Model
E Model
Chinese Model
HCD-EP505
Ver 1.2 2003.10
HCD-EP505 is the amplifier, CD
player, tape deck and tuner section
in CMT-EP505.
SPECIFICATIONS
CD Model Name Using Similar Mechanism HCD-EP50
Section CD Mechanism Type CS-21SC-1280
TAPE Model Name Using Similar Mechanism HCD-EP50
Section Tape Transport Mechanism Type CRL3439
9-873-673-03 Sony Corporation
2003J05-1 Home Audio Company
C2003.10 Published by Sony Engineering Corporation
AUDIO POWER SPECIFICATIONS:
(US model only)
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
with 8 Ωloads both channels driven, from 120 -
10,000 Hz; rates 14 W per channel minimum RMS
power, with no more than 10% total harmonic
distortion from 250 mW to rated output.
Amplifier section
Canadian model:
Continuous RMS power output (reference)
14 + 14 W
(8 Ωat 1 kHz, 10% THD)
European model:
DIN power output (rated) 11 + 11 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (reference)
14 + 14 W
(8 Ωat 1 kHz, 10% THD)
Music power output (reference)
27 + 27 W
Other models:
The following measured at AC 230 V orAC 120V,
50/60 Hz
DIN power output (rated) 11 + 11 W
(8 Ωat 1 kHz, DIN)
Continuous RMS power output (reference)
14 + 14 W
(8 Ωat 1 kHz, 10% THD)
Outputs
PHONES: Accepts headphones of 8 Ωor
(stereo mini jack) more
SPEAKER: Accepts impedance of 8 to
16 Ω
CD player section
System Compact disc and digital
audio system
Laser Semiconductor laser
(λ=780 nm)
Emission duration:
continuous
Frequency response 20 Hz - 20 kHz (±0.5 dB)
Tape player section
Recording system 4-track 2-channel stereo
Frequency response 50 - 13 000 Hz (±3 dB),
using Sony TYPE I cassette
Wow and flutter ±0.15% W.Peak (IEC)
0.1% W.RMS (NAB)
±0.2% W.Peak (DIN)
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna FM lead antenna
Antenna terminal 75 coaxial
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range
Pan-American model: 530 - 1 710 kHz
(with the interval set at 10 kHz)
531 - 1 710 kHz
(with the interval set at 9 kHz)
European models: 531 -1 602 kHz
(with the interval set at 9 kHz)
Other models: 531 - 1 602 kHz
(with the interval set at 9 kHz)
530 - 1 710 kHz
(with the interval set at 10 kHz)
Antenna Supplied AM loop antenna
Intermediate frequency 450 kHz
General
Power requirements
North American model: 120 V AC, 60 Hz
European model: 230 V AC, 50/60 Hz
Argentine model: 220 - 230 V AC, 50/60 Hz
Hong Kong model: 230 V AC, 50/60 Hz
Other models: 230 V AC, 50/60 Hz
Power consumption
US model: 35 W
Canadian model: 35 W
European models: 40 W
0.5 W (in the standby mode)
Other models: 40 W
Dimensions (w/h/d) Approx. 145 ×240×252 mm
Mass Approx. 3.5 kg
Supplied accessories: AM loop antenna (1)
Remote Commander (1)
Batteries (2)
FM lead antenna (1)
Design and specifications are subject to change
without notice.

2
HCD-EP505
Notes on chip component replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
•Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
•Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
•Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2VAC range are suit-
able. (See Fig. A)
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON 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.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the bottom.
Ver 1.1
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µFAC
voltmete
r
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

3
HCD-EP505
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 4
2. GENERAL ................................................................... 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 7
3-2. Front Panel Section ......................................................... 8
3-3. MAIN Board ................................................................... 8
3-4. CD Cabinet Section......................................................... 9
3-5. CD Mechanism Deck (CS-21SC-1280) ......................... 9
3-6. Tape Mechanism Deck (CRL3439) ................................ 10
3-7. Cassette Lid ..................................................................... 10
4. MECHANICAL ADJUSTMENTS....................... 11
5. ELECTRICAL ADJUSTMENTS......................... 11
6. DIAGRAMS
6-1. Block Diagram – TUNER Section – ............................. 15
6-2. Block Diagram – TAPE DECK Section – ..................... 16
6-3. Block Diagram – MAIN Section – ................................ 17
6-4. Block Diagram
– DISPLAY/POWER SUPPLY Section – ...................... 18
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 19
6-6. Printed Wiring Boards
– MAIN Section (AEP, UK, Chinese models) – ............ 20
6-7. Schematic Diagram
– MAIN Section (AEP, UK, Chinese models) (1/3) – ... 21
6-8. Schematic Diagram
– MAIN Section (AEP, UK, Chinese models) (2/3) – ... 22
6-9. Schematic Diagram
– MAIN Section (AEP, UK, Chinese models) (3/3) – ... 23
6-10. Printed Wiring Boards – MAIN Section
(Except AEP, UK, Chinese models) – ............................ 24
6-11. Schematic Diagram – MAIN Section
(Except AEP, UK, Chinese models) (1/3) – ................... 25
6-12. Schematic Diagram – MAIN Section
(Except AEP, UK, Chinese models) (2/3) – ................... 26
6-13. Schematic Diagram – MAIN Section
(Except AEP, UK, Chinese models) (3/3) – ................... 27
6-14. Printed Wiring Board – DISPLAY Section – ................ 28
6-15. Schematic Diagram – DISPLAY Section – ................... 29
6-16. Printed Wiring Board – POWER Section –................... 30
6-17. Schematic Diagram – POWER Section – ..................... 31
6-18. IC Pin Function Description ........................................... 34
7. EXPLODED VIEWS
7-1. Cabinet Section ............................................................... 36
7-2. Front Panel Section-1...................................................... 37
7-3. Front Panel Section-2...................................................... 38
7-4. CD Cabinet Section......................................................... 39
8. ELECTRICAL PARTS LIST ............................... 40
Ver 1.1

4
HCD-EP505
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emis-
sion, observe from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Press the I/1button to the power ON with no disc inserted
and press the [CD] button.
2. Open the lid for CD.
3. Turn on SW300 as following figure.
4. Confirm the laser diode emission while observing the object-
ing lens. When there is no emission, Auto Power Control cir-
cuit or Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.
SECTION 1
SERVICING NOTES
SW300
Ver 1.1
•MODEL IDENTIFICATION
– Bottom View –
Power Voltage Indication
Power Voltage
Indication
AC: 120 V 60 Hz 35 W
AC: 220 – 230V -50/60 Hz 40 W
AC: 230 V -50/60 Hz 40 W
Model
US and Canadian
models
Argentina model
Other models

5
HCD-EP505
Main unit
P– Z
PHONES jack qk
PLAY MODE qj
PRESET +/– qd
RDS (European model only)/DIR qj
Remote sensor 0
TAPE 3
TIMER indicator 1
TUNER 6
TUNER MEM qh
TUNING +/– qa
VOLUME control qs
ALPHABETICAL ORDER
A – M
Cassette compartment qg
CD 4
DIR qj
DISPLAY 2
Display Window 5
ENTER qh
MEGA BASS 8
MUSIC MENU 9
BUTTON DESCRIPTIONS
@/1 (power) wd
CD
.m(go back) qa
M>(go forward) qa
nN(play) w;
X(pause) ws
ZPUSH OPEN/CLOSE 7
x(stop) ql
TAPE
M> (fast forward) qa
X(pause) ws
nN (play) w;
z (recording) wa
.m (rewind) qa
ZPUSH OPEN/CLOSE qf
x(stop) ql
SECTION 2
GENERAL This section is extracted from
instruction manual.
LOCATION OF CONTROLS
– Front Panel –
Ver 1.1

6
HCD-EP505
ALPHABETICAL ORDER
A – M
CD wf
CLOCK/TIMER +/– w;
CLOCK/TIMER ON/OFF 2
CLOCK/TIMER SET 3
DISPLAY qa
ENTER qf
MEGA BASS qd
MUSIC MENU +/– qh
MUTING qg
P – Z
PLAY MODE/RDS
(European model only)/DIR 7
PRESET +/– 9
REPEAT 8
SLEEP 1
TAPE wd
TUNER/BAND 5
TUNER MEMORY qj
TUNING + q;
TUNING – qk
VOL (volume) +/– qs
Remote control
BUTTON DESCRIPTIONS
m(rewind) M
(fast forward) ql
.(go back) >
(go forward) w;
X(pause) ws
nN (play) wa
`/1(power) 4
x(stop) 6
tape function.
Ver 1.1
Setting the clock
1 Turn on the system.
2 Press CLOCK/TIMER SET on the
remote.
3 Press .or >on the remote
repeatedly to set the hour.
4 Press ENTER.
5
Press .or >on the remote
repeatedly to set the minute.
6 Press ENTER.
The clock starts working.
To adjust the clock
1Press CLOCK/TIMER SET on the remote.
2Press .or >on the remote to select
“SET CLK”, then press ENTER.
3Do the same procedures as step 3 to 6 above.
Note
The clock settings are canceled when you disconnect
the power cord or if a power failure occurs.

HCD-EP505
7
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY
3-4. CD CABINET SECTION
(Page 9)
3-2. FRONT PANEL SECTION
(Page 8)
3-6. TAPE MECHANISM DECK
(CRL3439)
(Page 10)
3-5. CD MECHANISM DECK
(CS-21SC-1280)
(Page 9)
3-7. CASSETTE LID
(Page 10)
3-3. MAIN BOARD
(Page 8)
SET

HCD-EP505
8
3-3. MAIN BOARD
Note: Follow the disassembly procedure in the numerical order given.
3-2. FRONT PANEL SECTION
6 connector
(CN505)
3 two screws
(K3
× 5)
1 two screws
(BTP2.6
× 10)
2 two screws
(BVTP3
× 10
)
3 two screws
(K3
× 5)
3 two screws
(K3
× 5)
7 connector
(SW300)
8 front panel section
5
4 claw
6 connector
(CN302)
5 connector
(CN303)
4 connector
(CN307)
3 connecto
r
(CN7)
1 connector
(CN601)
2 connector
(CN305)
9 main board
7 screw
(BTP2.6
× 8)
8

HCD-EP505
9
3-4. CD CABINET SECTION
3-5. CD MECHANISM DECK (CS-21SC-1280)
1 two screws
(BTP2.6
× 8
)
2 CD cabinet section
1 two screws
(BVTP3
× 10)
2 CD cover housing
7 vibration proof rubber
(pink)
7 vibration proof rubber
(pink)
4 four fiber washers
3 four pulley screws
7 vibration proof rubber
(ORG)
7 vibration proof rubber
(ORG)
8 CD mechanism deck (CS-21SC-1280)
5
6
two spring clamps
6 two spring clamps

HCD-EP505
10
3-6. TAPE MECHANISM DECK (CRL3439)
3-7. CASSETTE LID
1 two screws
(BVTP3 × 10)
1 two screws
(BVTP3 × 10
)
2 tape mechanism deck
(CRL3439)
1 Open the cassette lid.
3 cassette lid
2 claw
2 claw

11
HCD-EP505
SECTION 4
MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Setting:
Function: TAPE
Procedure:
1. Playback WS-48B (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor so that the fre-
quency counter reading becomes 3,000 Hz.
Specified Value: 2,910 to 3,090 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,955 to 3,045 Hz.
Adjustment Location:
PRECAUTION
1. Setting
MEGA BASS switch : OFF
TAPE DECK SECTION 0 dB=0.775 V
Test tape
Type Signal Used for
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
frequency counter
test tape
WS-48B
(3 kHz, 0 dB)
set
MAIN board
SPEAKER terminal (CN503)
–
+
47 kΩ
CAPSTAN/REEL
motor
Tape Speed
Adjustment
Mode Tension Meter Meter Reading
FWD CQ-403A more than 100 g
(more than 3.53 oz)
•TapeTension Measurement
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head pinch roller
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
•Torque Measurement
Mode Torque Meter Meter Reading
2.95 – 6.86 mN•m
FWD CQ-102C (30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 5.39 mN•m
FWD CQ-102C (1.5 – 5.5 g•cm)
Back Tension (0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF CQ-201B (more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW CQ-201B (more than 60 g•cm)
(more than 0.83 oz•inch)
Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)
(WS-48B)

12
HCD-EP505
TUNER SECTION 0 dB=1 µV
[AM]
Setting:
Function : TUNER
Band switch: AM
[FM]
Setting:
Function : TUNER
Band switch: FM
•Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
32 Ω
MAIN board
SPEAKER terminal (CN503
)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
set
32 Ω
0.01 µF
MAIN board
TP (FM ANT)
MAIN board
SPEAKER terminal (CN503)
digital voltmeter
100 kΩ
MAIN board
TP (FM VT)
TP (AM VT)
Ver 1.1
no mark: EXCEPT AEP, UK, Chinese models
< > : AEP, UK, Chinese models
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T401 <T406> 450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L408 530 kHz 1.3 ±0.1 V
<T402> <531 kHz>
Confirmation 1,710 kHz 7.8 ±0.5 V
<1,602 kHz> <7.1 ±0.5 V>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L407 <T401> 603 kHz
TC402 <TC401> 1,404 kHz
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation 87.5 MHz 2.4 ±0.1 V <1.4 to 1.6 V>
Confirmation 108 MHz 6.8 ±0.5 V <7.3 to 8.5 V>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
TC401 106.1 MHz
(EXCEPT AEP, UK, Chinese models)
Adjustment Location: MAIN board (See page 14)

13
HCD-EP505
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
T402
AM Frequency
Coverage Adjustment
T406
AM IF Adjustment
AM Tracking Adjustment
{
TC401
T401
– MAIN BOARD (Conductor Side) –
TP
(FM VT)
TP
(AM VT)
TP
(FM ANT)

14
HCD-EP505
MEMO

HCD-EP505
1515
AM
RF AMP
AM
OSC
AM
MIX
L. P. F
FM/AM PLL
U403
FM/AM PLL
U402
AM/FM
IF BUFFER
DECODER
• SIGNAL PATH
: FM
: AM
X401
7.2MHz
AMIN
IFIN IF OUT
FM/AM
IO1
AOUT
AIN
FMIN
20
1
14 13 18
SWALLOW
COUNTER
UNIVERSAL
COUNTER
CCB
INTERFACE
REFERENCE
DIVIDER
UNLOCK
DETECT
12 BIT
PROGRAMMABLE
DIVIDER
PHASE
DETECTOR/
CHARGE PUMP
SHIFT REGISTER & LATCH
1/2
DI
CL
CE
DO
DA IN
STATION
STEREO
FM
ON/OFF
TU-L
R-CH
R-CH
EMP OUT L IN L OUT
EMP OUT
RCLK
RDATA
RCLK
RDAT
MUX
TU-R
CLOCK
PLL CE
DA OUT
PD
XIN
XOUT
3
4
2
5
11
BO1
61017 16
• R-ch is omitted due
to same as L-ch.
CN402
CN401
U401
FM TUNER PACK
CF401
T401
AM RF
T402
AM OSC
D405
VT
CF402 CF403
1
5
8
AMRF AM-IF
FM-IN
FMDET EMP IN
AM DET
AMMIX
OSC
RF IN
OSC
IF OUT
OSC OUT
OSC OUT
6
1 23
2
30
427
29
24 5 10
22
16
FMRF IN FMIF
FMRF OUT
13
FM DET
1AMRF IN
3AM
OSC 8
AMOSC
BUFFER
20
FMOSC
15
AM/FM SW
7
AM/FMIF
BUFFER
FM
MIX L OUT
R OUT 17
3
CE
DO 6
4
DI
20
XOUT
1
XIN
CL 5
CF401
9 11 AMIF
7BO1
7IFIN
20 AOUT
19 AIN
18 PD
FMIN
AM
MIX
CF404
CF406
TC401
DETAM IF
AGC
CF404
FM
DET
FM IF
24
22
20
21 19 17
MUTING
13 14
TULED
6
STLED
7
BUFFER
Q405 416
2
X304
4.332MHz
RDS DECODER
IC305
FM/AM IF AMP,
AM RF AMP/MIX/OSC,
FM/AM DET, MPX
U402
14
13
XI
XO
E
(Page 17)
A
(Page 18)
D
(Page 18)
B
(Page 17)
FM ANT
75Ω
COAXIAL
AM ANT
AM FREQUENCY
COVERAGE
T402
AM
TRACKING
L401, TC401
AM IF
T406
FMDET
9
T407
FM DET
L. P. F.
T404
L. P. F.
FM/AM BAND
SELECT SWITCH
Q404
BPF
BPF401
FM IF AMP
Q403
L407
AM RF
L408
AM OSC
D407
TC402
AM FREQUENCY
COVERAGE
L408
AM TRACKING
L407, TC402
FM TRACKING
TC401 TC401
PHASE
DETECTOR/
CHARGE PUMP
(AEP, UK)
(EXCEPT AEP, UK, CH)
(AEP, UK, CH)
FM/AM IF AMP,
AM RF AMP/MIX/OSC,
FM/AM DET, MPX
U401
AM IF
T401
TU-L
R-CH TU-R
DA IN
CLOCK
PLL CE
DA OUT
AGC 12
16
AMIN
15
BUFFER
Q404
STATION
STEREO
FM/AM BAND
SELECT SWITCH
Q403
FM OSC BUFFER
Q401
L. P. F
X401
7.2MHz
(AEP, UK, CH)
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM – TUNER Section –
Ver 1.1

HCD-EP505
1616
: RECORD
: TAPE PLAY
REC/PB SWITCHING
U601
(AEP, UK, CH) (EXCEPT AEP, UK, CH)
ALC,
REC/PB AMP
U602
(AEP, UK, CH) (EXCEPT AEP, UK, CH)
R-CH
Q618
R-CH
L-CH
HPRE101 (1/2)
(RECORD/PLAYBACK)
R-CH R-CH
REC-EN
16
2
6
7
3
4
4
8
7 9
(PROTECT (FWD) DETECT)
(PROTECT (REV) DETECT)
(TAPE DETECT)
(CrO2DETECT)
REC/PB
SWITCH
Q605
REC/PB
SWITCH
Q601
AMP GAIN
CONTROL
Q603
ALC
CONTROL
Q619
ALC
BIAS
TRAP
CAPSTAN/REEL
MOTOR DRIVE
Q620, 621
SENSORA
90
AMS
96
SEL14
70
SEL15
SEL12
68
SEL10
66
BIAS OSC
L603
9V
REC BIAS
SWITCH
Q617, 618
M
(CAPSTAN/REEL)
SOL
93
TRIGGER
PLUNGER DRIVE
Q622, 624
(TRIGGER PLUNGER)
REC-LED
18
LED
DRIVE
Q305
D313
SYSTEM CONTROLLER
IC301 (1/3)
R-CH
R-CH
R-CH
R-CH
R-CH
R-CH
(HEAD POSITION DETECT)
MOTOR-ON
95
CD-EN 92
TU-EN
CD-EN
TU-EN
94
D305 D306 D308
D603
D601
TIME
13
LED
DRIVE
Q304
D312
I
(Page 18)
TL-CH
TR-CH
RL-CH
RR-CH
F
(Page 17)
TROUT
6V.N 1
AMS
U603
(AEP, UK, CH) (EXCEPT AEP, UK, CH)
HPRE101 (2/2)
(ERASE)
SWITCHING
R-CH
z
TIMER
BUFFER
Q625
BUFFER
Q613
TAPE PLAY/REC DETECT
SENSOR
REC AMP
Q611
MUTING
Q607
TAPE TYPE
SELECT SWITCH
Q609
G
(Page 18)
71
BIAS OSC
Q615
ALC
IN1
OUT1
ALC CONST
IN1
NF1
• SIGNAL PATH
• R-ch is omitted due to same as L-ch.
6-2. BLOCK DIAGRAM –TAPE DECK Section –
Ver 1.1

HCD-EP505
1717
6-3. BLOCK DIAGRAM – MAIN Section –
: RECORD
: TAPE PLAY
: CD PLAY
: TUNER
EEPROMDATA
INPINENA
SYSTEM CONTROLLER
IC301 (2/3)
EEPROM
IC302
CDDATA
CDCLK
CDRESET
L3
L4
F
(Page 16) RL-CH
TL-CH
RR-CH
TR-CH
DI CE
X2
X1
X301
4.194304MHz
80
75
EEPROMCLK 77
79
CD DOOR SW 91
17
MUTE 21
15
CL
14
LT4
516
12
3
14
88
15
SOUNDENA
DATAOUT
CLK
19
73
74
DATAIN
72
PLLENA
20
SDA
5
SCL
6
10
9
L2
L1
LTOUT 2
11
B
(Page 15)
L
R
1
LVROUTLVRIN
30
RVROUT R-CH
R-CH
R-CH
CD-L-IN
CD-R-IN
CD BLOCK
INPUT SELECT SWITCH,
ELECTRICAL VOLUME
U501
(AEP, UK, CH) (EXCEPT AEP, UK, CH)
R-CH
SOUND
CONTROL
CIRCUIT
R-CH
R-CH
MEGA BASS
CONTROL SWITCH
Q504
R-CH
PHONES
CN503
CD DO
CD CLK
CD \RESET
+
+
–
–
INPUT SELECT
SWITCH
SELECT SWITCH
SWITCH
LTCOM
4
LT3
6
LT2
7
LT1
8
+9V
R-CH
R-CH
E
(Page 15)
TU-R
TU-L
DA IN
CLOCK
DA OUT
STEREO
76
STEREO
STATION
6
STATION
PLL CE
R-CH
D506
D505
D507
H501
ZPUSH
OPEN/CLOSE
SW300
HEADPHONE
AMP
U503
(AEP, UK, CH) (EXCEPT AEP, UK, CH)
MUTING
Q501
MUTING
Q505
SPEAKER
IMPEDANCE
USE 8Ω
POWER AMP
U502
(AEP, UK, CH) (EXCEPT AEP, UK, CH)
• R-ch is omitted due to same as L-ch.
• SIGNAL PATH
Ver 1.1

HCD-EP505
1818
6-4. BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section –
SYSTEM CONTROLLER,
LIQUID CRYSTAL DISPLAY DRIVER
IC301 (3/3)
POWER ON/OFF
RELAY DRIVE
Q205, 206
POWER
TRANSFORMER
(MAIN)
T201
LINE
FILTER
L201
AC IN
POWER
TRANSFORMER
(SUB)
T202
RE201
B+ AMP
POWER AMP B+
D801
D802
CD-EN
TU-EN
D804
RESET 84
PWRFAIL 86
D901 – 903
(LCD BACK LIGHT)
REMOTE CONTROL
RECEIVER
X302
85 REMOTEIN
FM ON/OFF
CD-EN, TU-EN
ROTARY
ENCODER
X303
ENCODERA
97
ENCODERB
98
SEG30
62
SEG31
63
SEG32
64
SEG29
61
SEG28
60
100, 1 – 4
COM0 – COM3 KEY1 – KEY5
23 – 26
SEG0 – SEG27
32 – 59
SW301 – 317
X303
VOLUME
LIQUID CRYSTAL
DISPLAY
CN301
RECT
D206, 208
RECT
D212, 213,
D216, 218
RECT
D202, 204
+8V
REGULATOR
Q802, 803
8V (CD)
CD BLOCK B+
9V
TAPE DECK SECTION B+
+5V
M12V
CAPSTAN/REEL MOTOR B+
VT12V
FM CIRCUIT B+
5V (CPU)
SYSTEM CONTROLLER,
EEPROM B+
REGULATOR
CONTROL SWITCH
Q804
+12V
REGULATOR
Q808
+5V
REGULATOR
Q801
+12V
REGULATOR
Q805
+9V
REGULATOR
U801
(AEP, UK, CH)
(EXCEPT AEP, UK, CH)
FM/AM PLL B+
FM/AM PLL B+
FM/AM PLL,
RDS DECODER B+
RESET SIGNAL
GENERATOR
IC304
RDSCLK 87
RDSDATA 7
POWER
RDATA
RCLK
22
RESET
SWITCH
Q306
D303 D302 D301
A
(Page 15)
I
(Page 16)
G
(Page 16)
D
(Page 15)
SWITCHING
BUFFER
Q302
SWITCHING
Q301
B+ SWITCH
Q401, 402
B+ SWITCH
Q406
B+ SWITCH
Q406, 407
+5V REGULATOR
Q405
(AEP, UK)
(AEP, UK, CH)
(AEP, UK, CH)
(EXCEPT AEP, UK, CH)
(CH)
(AEP, UK)
(AEP, UK, CH)
D304
SW501
AM FREQ
STEP
10kHz 9kHz
(EXCEPT AEP, UK, CH, HK)
(EXCEPT AEP, UK, CH, HK)
(AEP, UK, CH)
(HK)
(AEP, UK, HK, CH)
(EXCEPT US, CND)
(EXCEPT AEP, UK, CH) AM FREQUENCY
STEP SELECT
SWITCH
Q307
AM FREQUENCY
STEP SELECT
SWITCH
Q308
Ver 1.1

HCD-EP505
1919
Note:
Lescomposants identifiéspar
une marque 0sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro
spécifié.
6-5. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
•All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•All resistors are in Ωand 1/4W or less unless otherwise
specified.
•f: internal component.
•C: panel designation.
•A: B+ Line.
•B: B– Line.
•Voltagesare takenwithaVOM(Inputimpedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
•Circled numbers refer to waveforms.
•Signal path.
F: FM
f: AM
E: TAPE PLAY
a: RECORD
J: CD PLAY
•Abbreviation
AR : Argentina model
CH : Chinese model
CND : Canadian model
E51 : Chilean and Peruvian models
HK : Hong Kong model
Note on Printed Wiring Boards:
•X: parts extracted from the component side.
•W: indicates side identified with part number.
•f: internal component.
•: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
12.4 Vp-p
17.8 µs
3.0 Vp-p
140 ns
•Waveforms
– MAIN Board (AEP, UK, CH models) –
1U403 w; (XOUT) (TUNER mode)
2Q615 (Collector) (REC mode)
5.1 Vp-p
240 ns
– DISPLAY Board –
3IC301 ul (X1)
1.8 Vp-p
230 ns
4IC305 qf (XO) (AEP, UK model)
Ver 1.1
Note:
Thecomponents identified
by mark 0or dotted line
withmark 0arecritical for
safety.
Replace only with part
number specified.
12.4 Vp-p
17.8 µs
4.0 Vp-p
140 ns
– MAIN Board (Except AEP, UK, CH models) –
wa U402 ws (XOUT) (TUNER mode)
ws Q615 (Collector) (REC mode)

HCD-EP505
2020
6-6. PRINTED WIRING BOARDS – MAIN Section (AEP, UK, CH models) –
U601
U801
U501
U602
J98
U402
U603
U403
U502
U503
TP
(AM VT)
5
6
4
1
2
3
5
4
1
2
3
4
5
3
2
1
AM OSC
AM ANT
TP
(FM ANT)
1
8
TP
(FM VT)
FM TUNER
PACK
4
5
3
2
1
4
5
3
2
1
FM DET
AM IF
E
C
B
MAIN BOARD
B
C
E
B
C
E
B
C
E
E
C
B
BCE
B
C
E
B
C
E
BCE
B
C
E
B
C
E
B
C
E
EBC
E
C
B
E
C
B
B
C
E
B
C
E
132
BC E
B
C
E
1
3
ECBECB
E
C
B
E
C
B
E
C
BECB
B
C
E
B
C
E
B
C
E
BCE
BCE
E
C
B
ECB
ECB
C
B
E
B
C
E
BCE
BCE
B
C
E
C
B
E
EBC
BCE
ECB
AKA
CN401
FM ANT
75Ω
COAXIAL
2
1
1
2
AM
ANT
CN402
–
+
–
+
L
R
SPEAKER
(IMPEDANCE USE 8Ω)
CN503
E
POWER
BOARD
CN505
B
DISPLAY
BOARD
D605
D
DISPLAY
BOARD
TAPE
MECHANISM
BLOCK
∗CD
BLOCK
∗SUPPLIED AS THE
ASSEMBLED BLOCK
C
DISPLAY
BOARD
A
DISPLAY
BOARD
123
654
BIAS
OSC
HPRE101
REC/PB/ERACE
HEAD
(AEP, UK)
HEADPHONE
BOARD
1
23
46
789
H501
PHONES
51
5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
D401 F-4
D402 F-3
D403 F-4
D404 F-4
D405 F-7
D501 I-11
D502 J-6
D503 I-6
D505 K-10
D506 L-9
D507 L-7
D508 G-5
D601 E-16
D603 G-15
D604 G-14
D605 N-12
D801 N-11
D802 L-11
D803 O-5
D804 O-5
D806 L-10
D808 O-10
D904 K-5
D905 J-5
Q401 G-4
Q402 C-4
Q403 E-7
Q404 C-10
Q405 B-11
Q406 B-10
Q501 H-5
Q502 I-5
Q503 I-6
Q504 J-6
Q505 L-9
Q506 L-8
Q601 D-12
Q602 E-15
Q603 D-13
Q604 D-15
Q605 C-13
Q606 D-15
Q607 F-13
Q608 F-14
Q609 F-13
Q610 F-12
Q611 G-8
Q612 G-9
Q613 I-13
Q614 I-13
Q615 C-15
Q616 F-15
Q617 G-15
Q618 G-15
Q619 F-13
Q620 M-13
Q621 M-13
Q622 N-13
Q624 N-13
Q625 H-14
Q801 N-7
Q802 M-10
Q803 M-10
Q804 L-9
Q805 N-8
Q808 O-5
U402 E-9
U403 C-7
U501 I-8
U502 L-6
U503 H-4
U601 C-14
U602 E-14
U603 G-13
U801 N-9
Z801 N-7
Z802 M-9
Z803 O-8
Z804 O-7
Ref. No. LocationRef. No. Location
•Semiconductor Location
(Page 30) (Page 28) (Page 28)
(Page 28)
(Page 28)
Ver 1.1