Sony HCDEP-505 Service manual

HCD-EP505

SERVICE MANUAL

Ver 1.2 2003.10

HCD-EP505 is the amplifier, CD
player , tape deck and tuner section
in CMT-EP505.

CD
Section

TAPE
Section

SPECIFICATIONS

US Model

Canadian Model

AEP Model

UK Model

E Model

Chinese Model

Model Name Using Similar Mechanism HCD-EP50
CD Mechanism Type CS-21SC-1280
Model Name Using Similar Mechanism HCD-EP50
Tape Transport Mechanism Type CRL3439

AUDIO POWER SPECIFICATIONS:
(US model only)

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

with 8 Ω loads 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)

European model:

DIN power output (rated) 11 + 11 W

Continuous RMS power output (reference)

Music power output (reference)

Other models:

The following measured at AC 230 V or AC 120 V,
50/60 Hz
DIN power output (rated) 11 + 11 W

Continuous RMS power output (reference)

Outputs
PHONES: Accepts headphones of 8 Ω or
(stereo mini jack) more
SPEAKER: Accepts impedance of 8 to

14 + 14 W
(8 Ω at 1 kHz, 10% THD)

(8 Ω at 1 kHz, DIN)

14 + 14 W
(8 Ω at 1 kHz, 10% THD)

27 + 27 W

(8 Ω at 1 kHz, DIN)

14 + 14 W
(8 Ω at 1 kHz, 10% THD)

16 Ω

CD player section

System Compact disc and digital

Laser Semiconductor laser

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),

Wow and flutter ±0.15% W.Peak (IEC)

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

European models: 531 -1 602 kHz

audio system
(λ=780 nm)

Emission duration:
continuous

using Sony TYPE I cassette

0.1% W.RMS (N AB)
±0.2% W.Peak (DIN)

(with the interval set at 10 kHz)
531 - 1 710 kHz
(with the interval set at 9 kHz)

(with the interval set at 9 kHz)

Other models: 531 - 1 602 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

Other models: 40 W
Dimensions (w/h/d) Approx. 145 × 240× 252 mm
Mass Approx. 3.5 kg

Supplied accessories: AM loop antenna (1)

Design and specifications are subject to change
without notice.

(with the interval set at 9 kHz)
530 - 1 710 kHz
(with the interval set at 10 kHz)

0.5 W (in the standby mode)

Remote Commander (1)
Batteries (2)
FM lead antenna (1)

9-873-673-03 Sony Corporation

2003J05-1 Home Audio Company
C 2003.10 Published by Sony Engineering Corporation

COMPACT DISC DECK RECEIVER

HCD-EP505

r

Ver 1.1

Notes on chip component replacement

•Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 270 ˚C dur­ing 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 follow­ing 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. Follo w 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” indica­tion is 0.75 V, so analog meters must have an accurate low­voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex­amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit­able. (See Fig. A)

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra­diation exposure.

This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER
PRODUCT MARKING is
located on the bottom.

To Exposed Metal
Parts on Set

1.5 k

0.15 µF

Fig. A. Using an AC voltmeter to chec k AC leakage.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
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 PUB­LISHED BY SONY.

Ω

Earth Ground

AC
voltmete
(0.75 V)

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM­POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

2

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

HCD-EP505

Ver 1.1

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

3

HCD-EP505

Ver 1.1

SECTION 1

SERVICING NOTES

NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro­static 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 emis­sion, observe from more than 30 cm away from the objectiv e lens.

LASER DIODE AND FOCUS SEARCH OPERATION
CHECK

1. Press the I/1 button 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 object­ing lens. When there is no emission, Auto Power Control cir­cuit or Optical Pick-up is broken.
Objective lens moves up and down five times for the focus
search.

• MODEL IDENTIFICATION
– Bottom View –

Power Voltage Indication

Model

US and Canadian
models

Argentina model
Other models

AC: 120 V 60 Hz 35 W
AC: 220 – 230 V - 50/60 Hz 40 W

AC: 230 V - 50/60 Hz 40 W

Power Voltage

Indication

SW300

4

LOCATION OF CONTROLS
– Front Panel –

Main unit

SECTION 2

GENERAL

HCD-EP505

Ver 1.1

This section is extracted from
instruction manual.

ALPHABETICAL ORDER

A – M

Cassette compartment qg
CD 4
DIR

qj

DISPLAY 2
Display Window 5

ENTER qh
MEGA BASS 8
MUSIC MENU 9

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

BUTTON DESCRIPTIONS

@/1 (power) wd

CD

. m (go back) qa
M > (go forward) qa

nN(play) w;
X (pause) ws
Z PUSH OPEN/CLOSE 7
x (stop) ql

TAPE

M > (fast forward) qa
X (pause) ws
nN (play) w;
z (recording) wa
. m (rewind) qa
Z PUSH OPEN/CLOSE qf
x (stop) ql

5

HCD-EP505

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

1 Press CLOCK/TIMER SET on the remote.
2 Press . or > on the remote to select

“SET CLK”, then press ENTER.

3 Do 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.

Ver 1.1

Remote control

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

tape function.

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

>

6

• This set can be disassembled in the order shown below.

3-1. DISASSEMBLY FLOW

SET

3-2. FRONT PANEL SECTION

(Page 8)

HCD-EP505

SECTION 3

DISASSEMBLY

3-3. MAIN BOARD

(Page 8)

3-4. CD CABINET SECTION

(Page 9)

3-5. CD MECHANISM DECK

(CS-21SC-1280)
(Page 9)

3-6. TAPE MECHANISM DECK

(CRL3439)
(Page 10)

3-7. CASSETTE LID

(Page 10)

7

HCD-EP505

)

r

Note: Follow the disassembly procedure in the numerical order given.

3-2. FRONT PANEL SECTION

4

claw

3

two screws

×

5)

(K3

1

two screws
(BTP2.6

×

10)

2

two screws
(BVTP3

×

10

3-3. MAIN BOARD

7

screw
(BTP2.6

5

7

8

front panel section

8

×

8)

connector
(SW300)

3

two screws
(K3

1

connector
(CN601)

×

5)

6

connector
(CN505)

9

3

two screws
(K3

2

connector
(CN305)

main board

×

5)

3

connecto
(CN7)

4

6

connector
(CN302)

5

connector
(CN303)

connector
(CN307)

8

3-4. CD CABINET SECTION

)

2

CD cabinet section

1

two screws
(BTP2.6

HCD-EP505

×

8

3-5. CD MECHANISM DECK (CS-21SC-1280)

6

two spring clamps

7

vibration proof rubber
(pink)

4

four fiber washers

3

four pulley screws

7

vibration proof rubber
(ORG)

5

8

CD mechanism deck (CS-21SC-1280)

two spring clamps

6

7

vibration proof rubber
(ORG)

7

vibration proof rubber
(pink)

1

two screws
(BVTP3

×

10)

2

CD cover housing

9

HCD-EP505

)

3-6. TAPE MECHANISM DECK (CRL3439)

2

tape mechanism deck (CRL3439)

1

two screws
(BVTP3 × 10)

1

two screws
(BVTP3 × 10

3-7. CASSETTE LID

1

Open the cassette lid.

3

cassette lid

2

claw

2

claw

10

SECTION 4

MECHANICAL ADJUSTMENTS

HCD-EP505

SECTION 5

ELECTRICAL ADJUSTMENTS

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 demagne­tizer. (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

FWD CQ-102C (30 – 70 g•cm)

FWD
Back Tension

FF CQ-201B (more than 60 g•cm)

REW CQ-201B (more than 60 g•cm)

CQ-102C (1.5 – 5.5 g•cm)

•Tape Tension Measurement

Mode Tension Meter Meter Reading

FWD CQ-403A

2.95 – 6.86 mN•m

(0.42 – 0.97 oz•inch)

0.15 – 5.39 mN•m

(0.021 – 0.076 oz•inch)

more than 5.89 mN•m

(more than 0.83 oz•inch)

more than 5.89 mN•m

(more than 0.83 oz•inch)

more than 100 g

(more than 3.53 oz)

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

Tape Speed Adjustment

Setting:

Function: TAPE

test tape
WS-48B
(3 kHz, 0 dB)

set

Procedure:

1. Playback WS-48B (tape center) in the FWD state.

2. Adjsut the volume in CAPSTAN/REEL motor so that the fre­quency 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.

frequency counter

47 kΩ

+
–

MAIN board
SPEAKER terminal (CN503)

Adjustment Location:

CAPSTAN/REEL
motor

Tape Speed
Adjustment

Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)

(WS-48B)

11

HCD-EP505

)

Ver 1.1

TUNER SECTION 0 dB=1 µV

[AM]

Setting:

Function : TUNER
Band switch: AM

AM RF signal

generator

30% amplitude
modulation by
400 Hz signal
Output level: as low as possible

[FM]

Setting:

Function : TUNER
Band switch: FM

FM RF signal

generator

22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible

Put the lead-wire
antenna close to
the set.

set

MAIN board

0.01 µF

MAIN board
TP (FM VT)
TP (AM VT)

TP (FM ANT)

set

digital voltmeter

100 kΩ

level meter

32 Ω

+
–

MAIN board
SPEAKER terminal (CN503

level meter

32 Ω

+
–

MAIN board
SPEAKER terminal (CN503)

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

<T402> <531 kHz>

Confirmation

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>

Adjust for a maximum reading on level meter

TC401 106.1 MHz

1,710 kHz 7.8 ± 0.5 V

<1,602 kHz> <7.1 ± 0.5 V>

AM TRACKING ADJUSTMENT

FM TRACKING ADJUSTMENT

1.3 ± 0.1 V

(EXCEPT AEP, UK, Chinese models)

Adjustment Location: MAIN board (See page 14)

•Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

12

Adjustment Location and Connecting Points

HCD-EP505

– MAIN BOARD (Component Side) –

T406

AM IF Adjustment

AM Tracking Adjustment

TC401

{

T401

T402

AM Frequency

Coverage Adjustment

– MAIN BOARD (Conductor Side) –

TP

(FM VT)

TP

(FM ANT)

TP

(AM VT)

13

HCD-EP505

MEMO

14

6-1. BLOCK DIAGRAM – TUNER Section –

SECTION 6

DIAGRAMS

HCD-EP505

Ver 1.1

CN401

FM ANT

75Ω

COAXIAL

(EXCEPT AEP, UK, CH)

L407

AM RF

TC402

L407, TC402

AM TRACKING

(AEP, UK, CH)

U401

FM TUNER PACK

RF IN

1

VT

5

D407

IF OUT

OSC OUT

TC401

FM TRACKING

BPF401

BPF

L408

AM OSC

L408

AM FREQUENCY

COVERAGE

8

6

TC401

24 5 10

CF406

22

FMRF OUT

FMRF IN FMIF

AMRF IN

1

AM

3

OSC

AM/FM SW

CF401

13

FM DET

FM

MIX

AM

9 11

MIX

AMOSC

8

BUFFER

20

FMOSC

AM/FMIF

7

BUFFER

15

FM IF AMP

Q403

FM/AM IF AMP,

AM RF AMP/MIX/OSC,

FM/AM DET, MPX

T401

AM IF

FM OSC BUFFER

Q401

FM/AM BAND

SELECT SWITCH

Q403

CF402

U401

L. P. F

CF401

CF404

CF403

(AEP, UK)

XIN

TU-L

TU-R

R-CH

X401

7.2MHz

STATION

FM

DET

STEREO

DA IN
CLOCK
PLL CE

DA OUT

FMDET

L. P. F.

T404

24

22

AM DET

EMP IN

DECODER

EMP OUT L IN L OUT

21 19 17

EMP OUT

20

R-CH

BUFFER

Q404

1

20

DI

4

CL

5

CE

3

DO

6

FM IF

L. P. F.

BUFFER

Q405

4

MUTING

MUX

L OUT

16

R OUT

17

AMIF

16

FMIN

IFIN

7

BO1

7

FM/AM PLL

AOUT

20

AIN

19

PD

18

12

AGC

15

AMIN

XOUT

U402

FM-IN

1 23

X304

4.332MHz

13

XI

RDS DECODER

IC305

R-CH

14

XO

TU-L

TU-R

RCLK

RDAT

RCLK

16

RDATA

2

A

B

(Page 18)

(Page 17)

CN402

AM ANT

• R-ch is omitted due
to same as L-ch.

• SIGNAL PATH

: FM

: AM

T401

AM RF

TC401

L401, TC401

AM

TRACKING

D405

FM/AM PLL

U403

AMRF

OSC

29

T402

AM OSC

T402

AM FREQUENCY

COVERAGE

14 13 18

FMIN

AM

RF AMP

AM

OSC

OSC

AM

MIX

OSC OUT

30

AMIN

1/2

AMMIX

2

T406

AM IF

AOUT

SWALLOW

COUNTER

CF404

L. P. F

PROGRAMMABLE

SHIFT REGISTER & LATCH

AM-IF

427

FM/AM IF AMP,

AM RF AMP/MIX/OSC,

FM/AM DET, MPX

PD

AIN

PHASE

PHASE

DETECTOR/

DETECTOR/

CHARGE PUMP

CHARGE PUMP

12 BIT

DIVIDER

U402

AGC

DETAM IF

UNLOCK

DETECT

FMDET

9

T407

FM DET

X401

7.2MHz

1

XIN

REFERENCE

DIVIDER

20

XOUT

AM/FM

IF BUFFER

IF OUT

13 14

11

IFIN

UNIVERSAL

COUNTER

IO1

FM/AM

FM/AM BAND

SELECT SWITCH

Q404

61017 16

BO1

INTERFACE

CCB

TULED6STLED

7

(AEP, UK, CH)

FM

ON/OFF

STEREO

STATION

DI

3

CL

4

CE

2

DO

5

DA IN

CLOCK

PLL CE

DA OUT

D

E

(Page 18)

(Page 17)

1515

HCD-EP505

Ver 1.1

6-2. BLOCK DIAGRAM – TAPE DECK Section –

HPRE101 (1/2)

(RECORD/PLAYBACK)

L-CH

R-CH

R-CH

R-CH

7 9

R-CH

R-CH

8

REC/PB SWITCHING

BIAS
TRAP

U601

(AEP, UK, CH) (EXCEPT AEP, UK, CH)

REC/PB
SWITCH

Q605

AMP GAIN
CONTROL

R-CH

6

NF1

IN1

7

R-CH

ALC

ALC

CONST

2

Q618

4

ALC

CONTROL

Q619

Q603

OUT1

4

ALC

IN1

3

ALC,

REC/PB AMP

(AEP, UK, CH) (EXCEPT AEP, UK, CH)

REC/PB
SWITCH

Q601

U602

D603

MUTING

Q607

(AEP, UK, CH) (EXCEPT AEP, UK, CH)

6

(CrO

2

DETECT)

(HEAD POSITION DETECT)

(TAPE DETECT)

(PROTECT (FWD) DETECT)

(PROTECT (REV) DETECT)

TROUT

AMS
U603

V.N

1

BUFFER

Q625

REC AMP

Q611

TAPE TYPE

SELECT SWITCH

Q609

R-CH

D308

BUFFER

Q613

D306

D305

SEL10

66

SEL12

68

SEL14

70

SEL15

71

RL-CH

RR-CH

R-CH

TL-CH

TR-CH

R-CH

SWITCHING

SYSTEM CONTROLLER

IC301 (1/3)

F

G

(Page 17)

(Page 18)

HPRE101 (2/2)

(ERASE)

BIAS OSC

L603

• R-ch is omitted due to same as L-ch.

• SIGNAL PATH

: TAPE PLAY
: RECORD

D601

BIAS OSC

Q615

R-CH

REC BIAS

SWITCH

Q617, 618

TAPE PLAY/REC DETECT

SENSOR

(CAPSTAN/REEL)

9V

(TRIGGER PLUNGER)

D313

z

D312

TIMER

M

CAPSTAN/REEL

MOTOR DRIVE

Q620, 621

TRIGGER

PLUNGER DRIVE

Q622, 624

LED

DRIVE

Q305

LED

DRIVE

Q304

90

96

95

93

18

13

16

SENSORA

AMS

MOTOR-ON

SOL

REC-LED

TIME

REC-EN

CD-EN

TU-EN

CD-EN

92

TU-EN

94

I

(Page 18)

1616