Panasonic SA-VK870GC / SA-VK870GCS / SA-VK870GS Service Manual ▷ View online
18.4. Video
98
18.5. Deck
99
18.6. Audio
100
18.7. Digital Audio Amp
101
18.8. Power
102
19 Schematic Diagram Notes
103
20 Schematic Diagram
105
20.1. DVD Module Circuit
105
20.2. Main Circuit
109
20.3. Panel, Side Bar (L) Led, Side Bar (R) Led Circuit
115
20.4. Tact Switch, Music Port, Remote Sensor, Mic, USB Circuit
116
20.5. Deck Circuit
117
20.6. D-Amp Circuit
118
20.7. SMPS Circuit
120
20.8. Deck Mechanism, AC Inlet, Voltage Selector Circuit
122
21 Printed Circuit Board
123
21.1. DVD Module P.C.B.
123
21.2. Main P.C.B.
124
21.3. Panel, Side Bar (L) Led, Side Bar (R) Led P.C.B.
125
21.4. Tact Switch, Music Port, Remote Sensor, Mic, USB P.C.B.
126
21.5. Deck, Deck Mechanism, AC Inlet, Voltage Selector P.C.B.
127
21.6. D-Amp P.C.B.
128
21.7. SMPS P.C.B. (For GC only)
129
21.8. SMPS P.C.B. (For GCS/GS only)
130
22 Basic Troubleshooting Guide
131
22.1. Troubleshooting Guide for F61 and/or F76
131
22.2. Basic Troubleshooting Guide for Traverse Unit (DVD
Module P.C.B.)
139
22.3. Basic Troubleshooting Guide for HDMI AV Output
140
23 Terminal Function of IC’s
142
23.1. IC2801 (RFKWVK870GC): IC System Control
142
23.2. IC6901(C0HBB0000057): IC FL Driver
142
24 Exploded Views
145
24.1. Cabinet Parts Location
145
24.2. Deck Mechanism Parts Location (RAA4111-S)
147
24.3. Packaging
148
25 Replacement Parts List
149
25.1. Component Parts List
150
26 Schematic Diagram for printing with letter size
166
5
SA-VK870GC / SA-VK870GCS / SA-VK870GS
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
6
SA-VK870GC / SA-VK870GCS / SA-VK870GS
1.2. Safety Precaution for AC Power Supply Cord (For GS only)
1.3. Before Use (For GS/GCS only)
Be sure to disconnect the mains cord before adjusting the voltage selector.
Use a minus(-) screwdriver to set the voltage selector (on the rear panel) to the voltage setting for the area in which the unit will
be used. (If the power supply in your area is 117V or 120V, set to the “117V or 120V” position.)
be used. (If the power supply in your area is 117V or 120V, set to the “117V or 120V” position.)
Note that this unit will be seriously damaged if this setting is not made correctly. (There is no voltage selector for some countries,
the correct voltage is already set.)
the correct voltage is already set.)
1.4. Before Repair and Adjustment
Disconnect AC power to discharge unit AC Capacitors as such (C5700, C5701, C5703, C5704, C5705, C5706, C5707) through a
10
10
Ω
, 10 W resistor 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 V-240 V, 50/60 Hz in NO SIGNAL mode at volume minimal should be ~ 500 mA.
Current consumption at AC 110 V-127 V, 50/60 Hz in NO SIGNAL mode at volume minimal should be ~ 750 mA.
1.5. 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.
7
SA-VK870GC / SA-VK870GCS / SA-VK870GS
Note:
When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again.
1.6. 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
3
REZX0023
BLACK WIRE
[M]
GCS/GS
5
REZX0024
RED WIRE
[M]
GCS/GS
18
RGRX0070P-A
REAR PANEL
[M]
GCS
18
RGRX0070P-B
REAR PANEL
[M]
GS
18
RGRX0070Q-A
REAR PANEL
[M]
GC
36
RKMX0144-K
TOP CABINET
[M]
68
REXX0684
BLACK WIRE
[M]
GC
69
REXX0685
RED WIRE
[M]
GC
70
REXX0686
WHITE WIRE
[M]
GCS/GS
71
REXX0687
BLUE WIRE
[M]
GCS/GS
A2
K2CP2CA00001
AC CORD
[M]
GCS
A2
K2CQ2CA00007
AC CORD
[M]
A2
K2CT3CA00004
AC CORD
[M]
GS
PCB2
REPX0676A
SMPS P.C.B
[M] (RTL) GC
REPX0676B
SMPS P.C.B
[M] (RTL) GCS/GS
PCB3
REPX0676A
AC INLET P.C.B
[M] (RTL) GC
REPX0676B
AC INLET P.C.B
[M] (RTL) GCS/GS
PCB17
REPX0676B
VOLTAGE SELECTOR P.C.B
[M] (RTL) GCS/GS
DZ5701
ERZV10V511CS
ZENER
[M]
S5701
K0ABCA000007
SW VOLTAGE SELECTOR
[M] GCS/GS
L5701
ELF15N035AN
LINE FILTER
[M]
GC
L5702
ELF22V035B
LINE FILTER
[M]
GC
L5703
ELF22V020A
LINE FILTER
[M]
GC
L5703
ELF22V022A
LINE FILTER
[M]
GCS/GS
T2900
G4D1A0000117
SWITCHING TRANSFORMER
[M]
T5701
ETS42BN1A6AD
MAIN POWER TRANSFORMER
[M]
T5751
ETS19AB256AG
BACKUP SW TRANSFORMER
[M]
PC5701
B3PBA0000402
PHOTO COUPLER
[M]
PC5702
B3PBA0000402
PHOTO COUPLER
[M]
PC5720
B3PBA0000402
PHOTO COUPLER
[M]
PC5799
B3PBA0000402
PHOTO COUPLER
[M]
F1
K5D502BNA005
FUSE
[M] GC
F1
K5D802BNA005
FUSE
[M] GCS/GS
FP2901
K5G401A00008
FUSE PROTECTOR
[M]
TH5701
D4CAC8R00002
THERMISTOR
[M] GC
TH5702
D4CAC8R00002
THERMISTOR
[M] GCS/GS
TH5860
D4CC11040013
THERMISTOR
[M]
P5701
K2AA2B000017
AC INLET
[M]
C5700
F1BAF1020020
1000pF
[M]
C5701
F0CAF334A087
0.33uF
[M]
C5704
F1BAF1020020
1000pF
[M]
C5705
F1BAF1020020
1000pF
[M]
C5706
F1BAF1020020
1000pF
[M]
C5707
F1BAF1020020
1000pF
[M]
8
SA-VK870GC / SA-VK870GCS / SA-VK870GS
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