DOWNLOAD Panasonic SC-HC17EB / SC-HC17EC / SC-HC17EE / SC-HC17EG Service Manual ↓ Size: 13.22 MB | Pages: 114 in PDF or view online for FREE

5

Disconnect AC power, discharge unit AC Capacitors as such C1702, C1710, C1725, C1727, and C1728 through a 10W, 1W resis-
tor to ground.
Caution : DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.

• Current consumption at AC 220 to 240V, at 50Hz in NO SIGNAL mode (at volume min in FM Tuner mode) should be ~200 mA.

The protection circuitry may have operated if either of the following conditions are noticed:

• No sound is heard when the power is turned on.
• Sound stops during a performance.

The function of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are
"shorted", or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used.
If this occurs, follow the procedure outlines below:

1. Turn off the power.
2. Determine the cause of the problem and correct it.
3. Turn on the power once again after one minute.

Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.

6

There are special components used in this equipment which are important for safety.

These parts are marked by   in the Schematic Diagrams, Exploded View & Replacement Parts List. It is essential that these
critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire or other hazards. Do not modify the
original design without permission of manufacturer.

Safety

Ref. No.

Part No.

Part Name & Description

Remarks

15

RFKHHC17EC-K

REAR CABINET ASS’Y

EB/EC/EG

15

RFKHHC17EE-K

REAR CABINET ASS’Y

EE

27

RMV0391-1

SMPS INSULATOR SHEET B

51

RMV0390

SMPS INSULATOR A

301

RAE5301Z-V

TRAVERSE 

A1

N2QAYC000060

REMOTE CONTROL

A2

K2CQ2CA00007

AC CORD

EC/EE/EG

A2

K2CZ3YY00024

AC CORD

EB

A3

RQT9561-D

O/I BOOK (Ge/Fr/It/Du)

EG

A3

RQT9562-R

O/I BOOK

EE

A3

RQT9563-B

O/I BOOK (En)

EB

A3

RQT9678-E

O/I BOOK (En/Sp/Sw/Da/Fi/Po/Cz)

EC

C1702

F0CAF224A105

0.22uF

C1710

F1BAF471A013

470pF

C1725

F0CAF154A105

0.15uF

C1727

F1BAF1020020

1000pF

C1728

F1BAF1020020

1000pF

F1

K5G202Y00006

FUSE

IP1100

K5H302Z00003

PROTECTOR

L1702

G0B183E00004

LINE FILTER

P1751

K2AA2B000011

AC INLET

PC1701

B3PBA0000503

PHOTO COUPLER

PCB8

REP4774C

SMPS P.C.B.

(RTL)

R1724

ERJ12YJ155U

1M     1/2W

R1726

ERJ12YJ155U

1M     1/2W

T1100

G4D1A0000117

SWITCHING TRANSFORMER

T1700

G4DYZ0000059

MAIN TRANSFORMER

TH1701

D4CAA5R10001

THERMISTOR

Z1752

ERZV10V511CS

ZNR

7

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec-
trostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and
semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage
caused by electrostatic discharge (ESD).

1. Immediately before handling any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your

body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap,
which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as alumin-

ium foil, to prevent electrostatic charge build up or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can

generate electrical charge sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most

replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or compara-
ble conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material

to the chassis or circuit assembly into which the device will be installed.
Caution :

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the

brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) suf-
ficient to damage an ES device).

8

This product utilizes a laser diode with the unit turned "on", invisible laser radiation is emitted from the pickup lens.
Wavelength: 790 nm (CD)
Maximum output radiation power from pickup: 100 

μW/VDE

Laser radiation from the pickup unit is safety level, but be sure the followings: 

1. Do not disassemble the pickup unit, since radiation from exposed laser diode is dangerous. 
2. Do not adjust the variable resistor on the pickup unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pickup lens for a long time.

Dieses Produkt enthält eine Laserdiode. Im eingeschalteten Zustand wird unsichtbare Laserstrahlung von der Lasereinheitadg-
estrahit.
Wellenlänge : 790nm (CD)
Maximale Strahlungsleistung der Lasereinheit :100 

μW/VDE

Die Strahlung an der Lasereinheit ist ungefährlich, wenn folgende Punkte beachtet werden:

1. Die Lasereinheit nicht zerlegen, da die Strahlung an der freigelegten Laserdiode gefährlich ist.
2. Den werkseitig justierten Einstellregler der Lasereinhit nicht verstellen.
3. Nicht mit optischen Instrumenten in die Fokussierlinse blicken.
4. Nicht über längere Zeit in die Fokussierlinse blicken.

THIS PRODUCT UTILIZES A LASER.
USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT
IN HAZARDOUS RADIATION EXPOSURE.