Panasonic SA-NC6EB Service Manual ▷ View online
18.11. (J) Deck Mechanism Circuit, (K) Tray Loading Circuit & (L)
USB Relay Circuit
113
18.12. Optical Pickup Unit Circuit
114
19 Printed Circuit Board
115
19.1. (A) DVD Module P.C.B (Side A & B )
116
19.2. (B) Main P.C.B
117
19.3. (C) Panel P.C.B & (D) Sub Panel P.C.B
118
19.4. (E) Power P.C.B, (F) Speaker P.C.B, (G) Transformer
P.C.B & (H) Sub Heatsink P.C.B
119
19.5. (I) Deck P.C.B, (J) Deck Mechanism P.C.B, (K) Tray
Loading P.C.B & (L) USB Relay P.C.B
120
20 Basic Troubleshooting Guide
121
20.1. Basic Troubleshooting Guide for Traverse Unit (DVD
Module P.C.B.)
121
20.2. Basic Troubleshooting Guide for HDMI AV output
121
21 Illustration of ICs, Transistors and Diodes
123
22 Terminal Function of IC
125
22.1. IC2600 (C2CBYY000451) System Microprocessor
125
23 Exploded Views
127
23.1. Cabinet Parts Location
127
23.2. Deck Mechanism Parts Location (RAA4111-S)
130
23.3. Packaging
131
24 Replacement Parts List
133
5
SA-NC6EB
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, ensure that all the protective devices such as insulation barriers and insulation papers shields are properly
installed.
3. After servicing, check for leakage current checks to prevent 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. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on
2. Using an ohmmeter measure the resistance value, 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 5.2MΩ.
When the exposed metal does not have a return path to the chassis, the reading must be
.
1.1.2. Leakage Current Hot Check (See Figure 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.
2. Connect a 1.5k
2. Connect a 1.5k
Ω, 10 watts resistor, in parallel with a 0.15µF capacitor, 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
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. Should the measurement is out 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.
Fig. 1
6
SA-NC6EB
1.2. Caution for AC Mains Lead
7
SA-NC6EB
1.3. Before repair and adjustment
Disconnect AC power, discharge Power Supply Capacitors C5951 through a 10
Ω, 5W resistor to ground.
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 230/240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 350mA.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 230/240V, 50 Hz in NO SIGNAL mode (volume min at CD mode) should be ~ 350mA.
1.4. 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.
· 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.
· 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.
1.5. 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
Reference No.
Part No.
Part Name & Description
Remarks
360
RAE2023Z-S
TRAVERSE UNIT
[M]
A2
K2CT3CA00004
AC CORD
[M]
C5251
F2A1V4710036
470 35V
[M]
C5252
F2A1V4710036
470 35V
[M]
C5351
F2A1V4710036
470 35V
[M]
C5352
F2A1V4710036
470 35V
[M]
C5512
F2A1V1020084
1000 35V
[M]
C5513
F2A1V1020084
1000 35V
[M]
C5951
ECQU2A104MLC
0.1 100V
[M]
F1
K5D162BLA013
1.6A FUSE 250V
[M]
JK5950
K2AA2B000011
JK AC INLET
[M]
L5950
ELF15N035AN
LINE FILTER
[M]
L5951
ELF15N035AN
LINE FILTER
[M]
RL5950
K6B1AEA00003
MAGNETRELAYS
[M]
T5950
G4CYAYY00141
THERMISTOR
[M]
T5951
G4C2AAJ00005
BACK-UP TRANSFORMER
[M]
Z5950
ERZV10V511CS
ZENER
[M]
8
SA-NC6EB
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