Panasonic SA-PT160E / SA-PT160EB / SA-PT160EG Service Manual ▷ View online
1 Safety Precautions
1.1. GENERAL GUIDELINES
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. After servicing, carry out the following leakage current checks to prevent the customer from being exposed to shock hazards.
1.1.1. LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on
the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the
chassis, the reading should be between 1M
chassis, the reading should be between 1M
Ω
and 5.2M
Ω
.
When the exposed metal does not have a return path to the chassis, the reading must be
1.1.2. LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5k
Ω
, 10 watts resistor, in parallel with a 0.15µF capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may
be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a measurement is outside of the limits
specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to
the customer.
specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to
the customer.
Figure 1
1.2. Before Repair and Adjustment (Using SMPS Module P.C.B.)
This unit uses Switching Mode Power Supply (SMPS) Module P.C.B. to provide the neccessary voltages for the unit.
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 230 V, 50 Hz in NO SIGNAL mode volume minimal should be ~ 650 mA. (For E/EG)
Current consumption at AC 230V~240V, 50 Hz in NO SIGNAL mode volume minimal should be ~ 650 mA. (For EB)
Note:
It is advisable to replace the SMPS Module P.C.B. as a unit.
It is advisable to replace the SMPS Module P.C.B. as a unit.
1.3. Protection Circuitry
The protection circuitry may have operated if either of the following conditions are noticed:
•
•
•
•
No sound is heard when the power is turned on.
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SA-PT160E / SA-PT160EB / SA-PT160EG
•
•
•
•
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.
1.4. Safety Parts Information
Safety Parts List:
There are special components used in this equipment which are important for safety.
These parts are marked by
These parts are marked by
in the Schematic Diagrams & 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.
without permission of manufacturer.
Table 1
Ref. No.
Part No.
Part Name & Description
Remarks
16
RGRX0058E-P
REAR PANEL
[M] E/EG-S/K
16
RGRX0058E-Q
REAR PANEL
[M] EB-K
28
RKMX0107-1S3
TOP CABINET
[M] E/EG-S
28
RKMX0107-K3
TOP CABINET
[M] E/EB/EG-K
40
N0AZ6GE00005
SMPS MODULE
[M] (RTL)
340
RAE2023Z-S
TRAVERSE UNIT
[M] (RTL)
L1002
J0JBC0000015
INDUCTOR
[M]
L1003
J0JBC0000015
INDUCTOR
[M]
L1004
J0JBC0000015
INDUCTOR
[M]
L1005
J0JBC0000015
INDUCTOR
[M]
L5101
G0AR65Y00001
CHOKE COIL
[M]
L5102
G0AR65Y00001
CHOKE COIL
[M]
L5103
G0AR65Y00001
CHOKE COIL
[M]
L5104
G0AR65Y00001
CHOKE COIL
[M]
L5201
G0AR65Y00001
CHOKE COIL
[M]
L5202
G0AR65Y00001
CHOKE COIL
[M]
L5203
G0AR65Y00001
CHOKE COIL
[M]
L5204
G0AR65Y00001
CHOKE COIL
[M]
L5301
G0AR65Y00001
CHOKE COIL
[M]
L5302
G0AR65Y00001
CHOKE COIL
[M]
L5303
G0AR65Y00001
CHOKE COIL
[M]
L5304
G0AR65Y00001
CHOKE COIL
[M]
A2
K2CQ2CA00007
AC CORD
[M] E/EG-S/K
A2
K2CT3CA00004
AC CORD
[M] EB-K
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SA-PT160E / SA-PT160EB / SA-PT160EG
1.5. Caution for AC Cord
(For United Kingdom)
( EB area code model only)
For your safety, please read the following text carefully.
This appliance is supplied with a moulded three pin
mains plug for your safety and convenience.
A 5-ampere fuse is fitted in this plug.
Should the fuse need to be replaced please ensure that
the replacement fuse has a rating of 5-ampere and that it
is approved by ASTA or BSI to BS1362.
Check for the ASTA mark
This appliance is supplied with a moulded three pin
mains plug for your safety and convenience.
A 5-ampere fuse is fitted in this plug.
Should the fuse need to be replaced please ensure that
the replacement fuse has a rating of 5-ampere and that it
is approved by ASTA or BSI to BS1362.
Check for the ASTA mark
or the BSI mark
on the
body of the fuse.
If the plug contains a removable fuse cover you mus eEM
ensure that it is refitted when the fuse is replaced.
If you lose the fuse cover the plug must not be used until
a replacement cover is obtained.
A replacement fuse cover can be purchased from your
local dealer.
ensure that it is refitted when the fuse is replaced.
If you lose the fuse cover the plug must not be used until
a replacement cover is obtained.
A replacement fuse cover can be purchased from your
local dealer.
If a new plug is to be fitted please observe the wiring
code as stated below.
If in any doubt please consult a qualified electrician.
code as stated below.
If in any doubt please consult a qualified electrician.
IMPORTANT
The wires in this mains lead are coloured in accordance
with the following code:
Blue: Neutral, Brown: Live.
As these colours may not correspond with the coloured
markings identifying the terminals in your plug, proceed
as follows:
The wire which is coloured Blue must be connected to
the terminal which is marked with the letter N or coloured
Black or Blue.
The wire which is coloured Brown must be connected to
the terminal which is marked with the letter L or coloured
Brown or Red.
with the following code:
Blue: Neutral, Brown: Live.
As these colours may not correspond with the coloured
markings identifying the terminals in your plug, proceed
as follows:
The wire which is coloured Blue must be connected to
the terminal which is marked with the letter N or coloured
Black or Blue.
The wire which is coloured Brown must be connected to
the terminal which is marked with the letter L or coloured
Brown or Red.
Before use
Remove the connector cover.
Remove the connector cover.
How to replace the fuse
The location of the fuse differ according to the type of AC
mains plug (figures A and B). Confirm the AC mains plug
fitted and follow the instructions below.
Illustrations may differ from actual AC mains plug.
The location of the fuse differ according to the type of AC
mains plug (figures A and B). Confirm the AC mains plug
fitted and follow the instructions below.
Illustrations may differ from actual AC mains plug.
1. Open the fuse cover with a screwdriver.
2. Replace the fuse and close or attach the fuse cover.
CAUTION!
IF THE FITTED MOULDED PLUG IS UNSUITABLE
FOR THE SOCKET OUTLET IN YOUR HOME THEN
THE FUSE SHOULD BE REMOVED AND THE PLUG
CUT OFF AND DISPOSED OF SAFELY.
THERE IS A DANGER OF SEVERE ELECTRICAL
SHOCK IF THE CUT OFF PLUG IS INSERTED INTO
ANY 13-AMPERE SOCKET.
IF THE FITTED MOULDED PLUG IS UNSUITABLE
FOR THE SOCKET OUTLET IN YOUR HOME THEN
THE FUSE SHOULD BE REMOVED AND THE PLUG
CUT OFF AND DISPOSED OF SAFELY.
THERE IS A DANGER OF SEVERE ELECTRICAL
SHOCK IF THE CUT OFF PLUG IS INSERTED INTO
ANY 13-AMPERE SOCKET.
WARNING: DO NOT CONNECT EITHER WIRE TO THE
EARTH TERMINAL WHICH IS MARKED WITH THE LETTER
E, BY THE EARTH SYMBOL
EARTH TERMINAL WHICH IS MARKED WITH THE LETTER
E, BY THE EARTH SYMBOL
OR COLOURED GREEN OR
GREEN/YELLOW.
THIS PLUG IS NOT WATERPROOF
KEEP DRY.
A A
Figure A
Figure B
Fuse cover
Figure A
Fuse
(5 ampere)
(5 ampere)
Figure B
Fuse
(5 ampere)
(5 ampere)
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SA-PT160E / SA-PT160EB / SA-PT160EG
2 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called
Electrostatically 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 electro static discharge (ESD).
Electrostatically 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 electro static discharge (ESD).
1. Immediately before handling any semiconductor component or semiconductor-equipped 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.
which should be removed for potential shock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup 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 removal 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, aluminum foil or comparable
conductive material).
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)
sufficient to damage an ES device).
sufficient to damage an ES device).
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SA-PT160E / SA-PT160EB / SA-PT160EG
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