Panasonic SA-VK91DGCS User manual

nAMPLIFIER SECTION
RMS Output Power : Dolby Digital Mode
Front - High Ch
90 W per channel (6 Ω), 1 kHz, 10% THD
Front - Low Ch
45 W per channel (12 Ω), 100 Hz, 10% THD
Surround Ch
45 W per channel (6 Ω), 1 kHz, 10% THD
Center Ch
100 W per channel (6 Ω), 1 kHz, 10% THD
Subwoofer
95 W per channel (6 Ω), 100 Hz, 10% THD
Total RMS Dolby Digital mode power
650 W
PMPO output power 7300 W
nFM/AM TUNER, TERMINALS SECTION
Preset station FM 15 stations
AM/MW 15 stations
Frequency Modulation (FM)
Frequency range 87.50 - 108.00 MHz (50 kHz step)
Sensitivity 2.5µV (IHF)
S/N 26dB 2.2µV
A
ntenna terminals 75Ω(unbalanced)
A
mplitude Modulation (AM/MW)
Frequency range 522 - 1629 kHz (9 kHz step)
520 - 1630 kHz (10 kHz step)
A
M sensitivity S/N 20 dB at 1000 kHz
560µV/m
©2004 Panasonic AVC Networks Singapore Pte.
Ltd. (RCB Registration Number: 197701580H) All
rights reserved. Unauthorized copying and
distribution is a violation of law.
SA-VK91DGCS
SA-VK91DGCP
Colour
(S)... Silver Type
A
udio performance (Amplifier)
Input sensitivity/Input impedance
A
ux 250 mV, 20 kΩ
Phone jack
Terminal Stereo, 3.5 mm jack
Mic jack
Sensitivity 0.7 mV, 600 Ω
Terminal Mono, 6.3 mm jack (2 system)
nCASSETTE DECK SECTION
Type Auto Reverse
Track system 4 Track, 2 Channel
Head Record/Playback Solid Permalloy Head
Erasure Double Gap Ferrite Head
Motor DC Servo Motor
Recording System AC Bias 100 kHz
Erase System AC Erase 100 kHz
Tape Speed 4.8 cm/s
Overall Frequency Response (+3, -6 dB) at DECK OUT
Normal (TYPE I) 35 Hz - 14 kHz
S/N Ratio 50 dB (A weighted)
Wow and Flutter 0.18 % (WRMS)
Fast Forward and Rewind Time Approx. 120 seconds with
C-60 cassette tape
nDISC SECTION
Disc played [8 cm or 12 cm]
(1) DVD-RAM (DVD-VR compatible, JPEG formatted disc)
(2) DVD-Audio
DVD Stereo System
Specifications
ORDER NO. MD0407366C3

(3) DVD-Video
(4) DVD-R (DVD-Video compatible)
(5) CD-Audio (CD-DA)
(6) Video CD
(7) SVCD (Conforming to IEC62107)
(8) CD-R/CD-RW (CD-DA, Video CD, SVCD, MP3, WMA, JPEG
formatted disc)
(9) MP3/WMA*
· Compatible compression rate:
MP3: between 32 kbps and 320 kbps
WMA: between 48 kbps and 192 kbps
(10) JPEG*
· Exif Ver 2.1 JPEG Baseline files
· Picture resolution: between 320x240 and 6144x4096 pixels
(Sub sampling is 4:2:2 or 4:2:0)
(11) HighMAT Level 2 (Audio and Image)
· The total combined maximum number of recognizable audio and
picture contents and groups: 4000 audio and picture contents
and 400 groups.
Pick up
Wavelength (DVD/CD) 662 nm/785 nm
A
udio ouptut (Disc)
Number of channels 5.1ch(FL,FR,C,SL,SR,SW)
A
udio performance (measurement at: Line out terminal)
Frequency response
CD-Audio 4Hz-20kHz(+1,-2dB)
nVIDEO SECTION
Video system
Signal system PAL625/50, PAL525/60, NTSC
Composite video output
Output level 1Vp-p(75Ω)
Terminal Pin jack (1 system)
S VIDEO output
Y output level 1Vp-p(75Ω)
C output level 0.3 Vp-p (75Ω)(PAL)
0.286 Vp-p (75Ω)(NTSC)
Terminal S terminal (1 system)
Component video output (480P/480I)
Y output level 1Vp-p(75Ω)
1 Before Use 4
2 Before Repair and Adjustment 4
3 Protection Circuitry 4
4 Safety Precautions 4
4.1. General Guidelines 4
PBoutput level 0.7 Vp-p (75 Ω)
PRoutput level 0.7 Vp-p (75 Ω)
Terminal
Pin jack (Y: green, PB:blue,P
R:red)(1system)
nGENERAL
Power supply
AC 110V/127V/220-230V/240V, 50/60Hz
Power consumption 313 W
Power consumption in standby mode:
1W
Dimensions (WxHxD) 250 x 330 x 372 mm
Mass 9.6 kg
Operating temperature range +5°Cto+35°C
Operating humidity range 5% to 90% RH (no condensation)
nSYSTEM
SC-VK91D (GCS) Music Center: SF-VK91D (GCS)
Front Speakers: SB-VK91D (GC)
Center Speaker: SB-PC81A (GC)
x1
Surround Speakers: SB-PS81A
(GC) x 2
Subwoofers: SB-WVK91 (GC) x 2
SC-VK91D (GCP) Music Center: SF-VK91D (GCP)
Front Speakers: SB-VK91D (GC)
Center Speaker: SB-PC81A (GC)
x1
Surround Speakers: SB-PS81A
(GC) x 2
Subwoofers: SB-WVK91 (GC) x 2
SF-VK91D GCS-S consists of SA-VK91D GCS-S & SB-PT81A GC-S
SF-VK91D GCP-S consists of SA-VK91D GCP-S & SB-PT81A GC-S
SB-PT81A GC-S consists of SB-PS81 GC (x 2) & SB-PC81A GC (x
1)
Notes:
1. Specifications are subject to change without notice. Mass and
dimensions are approximate.
2. Total harmonic distortion is measured by the digital spectrum
analyzer.
5 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices 5
6 Handling the Lead-free Solder 6
6.1. About lead free solder (PbF) 6
7 Cautions to be taken when handling Optical Pickup 7
7.1. Handling Optical Pickup 7
CONTENTS
Page Page
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SA-VK91DGCS / SA-VK91DGCP

7.2. Replacing Precautions for Optical Pickup Unit 7
7.3. Grounding for Preventing Electrostatic Destruction 7
8 Precaution of Laser Diode 8
9 Accessories 9
10 Operation Procedures 10
11 Disc information 12
12 About HighMAT 14
12.1. What is HighMAT? 14
12.2. Why use HighMAT? 14
12.3. The advantages of using HighMAT 14
12.4. Outline of the HighMAT standard 15
13 Procedure for repairing the set 17
13.1. Distinguish the problem 18
13.2. Diagnosis of Optical Pick-up Unit 21
14 Optical Pickup Self-Diagnosis and Replacement Procedure 23
14.1. Self-diagnosis 23
14.2. Cautions to Be Taken During Replacement of Optical
Pickup and Spindle Motor 24
15 Self-Diagnosis Function 25
15.1. Automatic Displayed Error Codes 25
15.2. Memorized Error Codes 25
15.3. Mode Table 1 25
15.4. DVD/CD Self-Diagnosis Error Code Description 26
15.5. Error Codes Stored During No Play 26
15.6. Mode Table 2 26
15.7. Tray Lock Function 29
15.8. Things to Do After Repair 29
16 Cautions To Be Taken During Servicing 30
16.1. Recovery after the dvd player is repaired 30
16.2. DVD Player Firmware Version Upgrade Process 30
16.3. Firmware Version Upgrade Process by Using Disc and
Recovery Process 30
16.4. Using Recovery Disc 30
16.5. Total Usage Time Display 31
16.6. After replacement of DVD Module 31
17 Disassembly and Assembly of Main Component 32
17.1. Disassembly flow chart 32
17.2. Disassembly of Top Cabinet 33
17.3. Disassembly for DVD changer unit 33
17.4. Disassembly for Panel P.C.B., MIC P.C.B. & Tact Switch
P.C.B. 34
17.5. Disassembly of Main P.C.B., Speaker P.C.B., Sub Power
P.C.B., Power P.C.B., Transformer P.C.B. & Voltage
Selector P.C.B. 35
17.6. Replacement for traverse deck 38
17.7. Replacement for optical pickup unit (DVD mechanism) 38
17.8. Procedure for removing CD loading mechanism 41
17.9. CR16 mechanism disassembly procedure 41
17.10. CR16 MECHANISM ASSEMBLY PROCEDURE 47
17.11. Disassembly for Traverse Unit 58
17.12. Disassembly of Deck Mechanism Unit 60
17.13. Replacement for the cassette lid ass 馳64
17.14. Counter-measure for tape trouble 65
18 Service Position 66
18.1. Checking Procedure 66
18.2. Checking the Main P.C.B., Speaker P.C.B., Power P.C.B.,
Sub Power P.C.B., Transformer P.C.B., Voltage Selector
P.C.B. and AC Inlet P.C.B. 66
18.3. Checking the Panel P.C.B., Tact P.C.B., Mic P.C.B., Deck
P.C.B. & Deck Mechanism P.C.B. 67
19 Measurements and Adjustments 68
19.1. Cassette Deck Section 68
19.2. Tuner Section 69
19.3. Alignment Points 70
20 Block Diagram 71
21 Schematic Diagram 80
21.1. Optical Pickup Unit Circuit 81
21.2. (A) DVD Module Circuit 82
21.3. (B) Main Circuit 89
21.4. (C) Panel Circuit , (D) Mic Circuit & (E) Tact Switch Circuit
98
21.5. (F) Deck Circuit & (G) Deck Mechanism Circuit 102
21.6. (H) Power Circuit 104
21.7. (I) Sub Power Circuit 106
21.8. (J) Speaker Circuit 107
21.9. (K) Transformer Circuit, (L) AC Inlet Circuit, (M) Voltage
Selector Circuit & (N) CD Loading Circuit 109
22 Printed Circuit Board 110
22.1. (A) DVD Module P.C.B. (Side: A & B ) 110
22.2. (B) Main P.C.B. 112
22.3. (C) Panel P.C.B. 113
22.4. (D) Mic P.C.B. & (E) Tact P.C.B. 115
22.5. (F) Deck P.C.B. & (G) Deck Mechanism P.C.B. 116
22.6. (H) Power P.C.B. 117
22.7. (I) Sub Power P.C.B. & (N) CD Loading P.C.B. 118
22.8. (J) Speaker P.C.B. 119
22.9. (K) Transformer P.C.B. 121
22.10. (L) AC Inlet P.C.B. & (M) Voltage Selector P.C.B. 122
23 Wiring Connection Diagram 123
24 Illustration of ICs, Transistors and Diodes 125
25 Terminal Function of IC 126
25.1. IC6800 (C2CBJG000460) System Microprocessor 126
26 Parts Location and Replacement Parts List 128
26.1. Deck Mechanism (RAA3412-S) 129
26.2. DVD Loading Mechanism 132
26.3. Cabinet 136
26.4. Electrical Parts List 139
26.5. Packing Materials & Accessories Parts List 153
26.6. Packaging 154
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SA-VK91DGCS / SA-VK91DGCP

1 Before Use
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 “127V” 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.)
2 Before Repair and Adjustment
Disconnect AC power, discharge Power Supply Capacitors C5815~C5818, C5829~C5830, C5835~C5836 and C5841 through a
10Ω, 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 110/127/220~230V, 50/60 Hz in NO SIGNAL at (vol. min, in CD mode) should be as below:
AC 50/60Hz 110 V ~1200mA
127 V ~1100mA
220-230 V ~ 700 mA
240 V ~ 650 mA
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.
· 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.
4 Safety Precautions
4.1. 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, make the following leakage current checks to prevent the customer from being exposed to shock hazards.
4.1.1. 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 1MΩand 5.2MΩ.
When the exposed metal does not have a return path to the chassis, the reading must be ･.
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SA-VK91DGCS / SA-VK91DGCP

Figure 1
4.1.2. 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 1.5kΩ, 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
be used to make the hot checks, leakage current must not exceed 1/2 milliamp. In case a 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.
5 Prevention of Electro Static Discharge (ESD) to
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by 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).
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 aluminium
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 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
comparable 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 body 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).
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SA-VK91DGCS / SA-VK91DGCP

6 Handling the Lead-free Solder
6.1. About lead free solder (PbF)
Distinction of PbF P.C.B.:
P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B.
Caution:
· Pb free solder has a higher melting point than standard solder; Typically the melting point is 50 - 70°F (30 - 40°C) higher. Please
use a high temperature soldering iron. In case of soldering iron with temperature control, please set it to 700 ± 20°F (370 ±
10°C).
· Pb free solder will tend to splash when heated too high (about 1100°F/600°C).
· When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the
soldering points with the Pb free solder until it melts enough.
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SA-VK91DGCS / SA-VK91DGCP

7 Cautions to be taken when handling Optical Pickup
The laser diode used inside optical pickup could be destroyed due to static electricity as a potential difference is caused by
electrostatic load discharged from clothes or human body. Handling the parts carefully to avoid electrostatic destruction during
repair.
7.1. Handling Optical Pickup
1. Do not impact on optical pickup as the unit structurally uses an extremely precise technology.
2. Short-circuit the flexible cable of optical pickup remove from the circuit board using a short-circuit pin or clip in order to prevent
laser diode from electrostatic destruction (Refer to Fig. 7.1 and Fig. 7.2)
3. Do not handle flexible cables forcibly as this may cause snapping. Handle the parts carefully (Refer to Fig. 7.1)
4. A new optical pickup is equipped with an anti-static flexible cable. After replacing and connecting to the flexible board, cut the
anti-static flexible cable. (Refer to Fig. 7.1)
Fig. 7.1
7.2. Replacing Precautions for Optical Pickup Unit
DVD/CD Optical Pickup
The optical pickup by which part supply was carried out attaches the short clip to the flexible board for laser diode electrostatic
discharge damage prevention. Please remove the short clip and be sure to check that the short land is open, before connecting.
(Please remove solder, when the short land short-circuits.)
7.3. Grounding for Preventing Electrostatic Destruction
1. Human body grounding
Use the anti-static wrist strap to discharge the static electricity accumulated in your body. (Refer to Fig. 7.2)
2. Work place grounding
Place a conductive material (conductive sheet) or ironboard where optical pickup is placed. (Refer to Fig. 7.2)
Note :
Keep your clothes away from optical pickup as wrist strap does not release the static electricity charged in clothes.
Fig. 7.2
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SA-VK91DGCS / SA-VK91DGCP

8 Precaution of Laser Diode
Caution :
This product utilizes a laser diode with the unit turned "ON", invisible laser radiation is emitted from the pick up lens.
Wavelength : 662 nm(DVD)/785 nm(CD)
Maximum output radiation power from pick up : 100 µW/VDE
Laser radiation from pick up unit is safety level, but be sure the followings:
1. Do not disassemble the optical pick up unit, since radiation from exposed laser diode is dangerous.
2. Do not adjust the variable resistor on the pick up unit. It was already adjusted.
3. Do not look at the focus lens using optical instruments.
4. Recommend not to look at pick up lens for a long time.
CAUTION!
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.
nUse of Caution Labels
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SA-VK91DGCS / SA-VK91DGCP

9 Accessories
Remote
control
AC power supply cord
FM indoor
antenna
AM indoor antenna
Video cable
AC Plug Adaptor
(For GCP only)
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SA-VK91DGCS / SA-VK91DGCP

10 Operation Procedures
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SA-VK91DGCS / SA-VK91DGCP

11
SA-VK91DGCS / SA-VK91DGCP

11 Disc information
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SA-VK91DGCS / SA-VK91DGCP

13
SA-VK91DGCS / SA-VK91DGCP

12 About HighMAT
12.1. What is HighMAT?
This word combines the abbreviations of Matsushita Electric Industrial Co. Ltd. and High Performance Media Access Technology,
and is a trademark of Microsoft Corporation. The products with the HighMAT logo shown below are made according to the
HighMAT standard.
HighMAT is a format that allows users to save digital contents such as photographs, audio, and images on a CD. This gives
consistency in the way of reading data when general consumer products (such as DVD players) and PCs are used, and thus, it is
easy to operate for the user.
12.2. Why use HighMAT?
Up to now, there was no harmonized standard from playing digital content stored in CD-ROM formats (including CD-R) on
consumer products like DVD players.Therefore, we used to have problems such as follow:
· There was no common play list or attached information on contents, which is called metadata.
· The data compression method differed according to the equipment.
· As the number of CD-ROMs recorded increased retrieved the contents became more difficult.
· Because display and operation methods were different depending on the equipment, the play order of the content on the same
disc could change.
12.3. The advantages of using HighMAT
Applying the HighMAT standard will solve the following problems and will improve usability.
· It will create a common user interface for both PC and consumer products.
· Regardless of the types of consumer products, such as DVD players, portable CD players, car stereos, and micro computers,
a consistent way to pay for digital content will be created and it will make it easier to retrieve data.
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SA-VK91DGCS / SA-VK91DGCP

· You can also play digital content on the disc, which was created in accordance with the HighMAT format with a conventional
CD-ROM player.
12.4. Outline of the HighMAT standard
1. Recording medium
· CD-R/CD-RW
· Supports ISO 9660 Level Expanded Joliet
· For multiple session
2. Support data format
· Level 1 player: WMA, MP3 (MPEG-1 Audio Layer 3)
· Level 2 player: WMA, MP3 (MPEG-1 Audio Layer 3), JPEG
· Level 3 player: WMA, MP3 (MPEG-1 Audio Layer 3), JPEG, WMV, MPEG4 (optional)
3. Limitation of data format
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SA-VK91DGCS / SA-VK91DGCP

· WMA, MP3 (MPEG-1 Audio Layer 3) 64 kbps - 160.999 kbps, 44.1 KHz, stereo, fixed bit rate/ variable bit rate.
· WMA, V2 and above, excluding Lossless/Voice/Pro
· JPEG: Max 6M pixel, Maximum file size: 3 MB
4. Limitations regarding the number of files on the media, etc.
· Total number of audio files: Maximum 450
· Total number of still picture files: Maximum 999
· Total number of animation files: Maximum 200
· Total number of directories: Maximum 400
· Length of a file name: Maximum 108 characters (Unicode)
· Total number of play lists: Maximum 200
· Number of contents in the playlist: Maximum 900
5. Composition of HighMAT disc
· Menu: Classified for the navigation of the HighMAT digital contents. When menu selected, its submenu or the play list will
be displayed.
· Play list: A list in which one or more digital contents are arranged in order
· Group: Sub-divided group of a play list.
· Digital Contents: Audio, still picture, and animation data.
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SA-VK91DGCS / SA-VK91DGCP

13 Procedure for repairing the set
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SA-VK91DGCS / SA-VK91DGCP

13.1. Distinguish the problem
How to distinguish the trouble
1. View mechanical part if visual damage occurred.
Confirm the movement of mechanical parts assembly
(tray ass’y, loading mechanism ass’y, etc.).
2. Diagnose if Optical Pickup Unit is faulty (refer to
diagnosis of Optical Pickup Unit).
3. If mechanism and OPU are OK, it is P.C.B.
13.1.1. Troubleshooting Guide Part 1
Checking Points Possible Faults Possible Reasons Countermeasure
AC Inlet Circuit/Voltage
Selector Circuit
1. Failure to power-up
the main unit.
2. Power On switch
· Wrong selection of AC
power to main unit.
· Voltage selector is faulty.
· AC inlet JK500 is faulty.
· AC Line filter L500 is
faulty.
· Power On switch broken.
· Replace of fuse if found faulty.
· Replace of voltage selector if found faulty.
· Replace of AC Inlet if found faulty or damaged.
· Replace AC Line filter is found faulty or damaged.
· Replace Power On button switch if necessary.
· If conditions as mentioned above is in good condition.
Check for wire connection. (W1/W2/W3/W4/W6/W7). If
connection is good, please proceed to check for
Transformer Circuit.
3. Intermittent Power
supply to main unit.
· Check for connection. · If condition 1 to 4 as mentioned above is in good
condition. Check for wire connection.
(W1/W2/W3/W4/W6/W7). If connection is good, please
proceed to check for Transformer Circuit
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SA-VK91DGCS / SA-VK91DGCP

Checking Points Possible Faults Possible Reasons Countermeasure
Transformer Circuit 1. No power supply
voltage to the Power
Circuit from AC In.
· Transformer no output
voltage.
· Power Line filter relay
RL502.
· D950 open circuit.
· Replace of Transformer T501 if found faulty.
· Replace of Power Relay if found faulty.
Speaker Circuit 1. No supply voltage to
Power Supply Circuit
from Transformer
Circuit. (+VccL/+VccH/-
VccL/-VccH)
· Fuse F3/F4 blown.
· Rectifier Circuit problem.
· Replace fuse F3/F4 if found faulty.
· Replace D5832/D5831/D5846/D5847 if any is found to
be faulty or damage.
1. No supply voltage to
Main & Power Supply
Circuit from
Transformer Circuit.
(+VccL/+VccH/-VccL/-
VccH)
· Rectifier Circuit problem.
· F5801/FP5802 open
circuit.
· Replace D5844 if found faulty.
· Replace FP5801/FP5802 of the same type as indicated
in the part-list if found faulty.
1. No supply voltage to
Panel Circuit.
· Q5815/D5835 faulty. (-VP
voltage not sufficient to
power FL display at - 30V)
· Q5816/D5839 faulty. (Sys
6V not sufficient to power
micro-processor IC at 6V.
· Replace Q5815/D5835 if found faulty.
· Replace Q5816/D5839 if found faulty.
Sub Power Circuit 1. No output FL/FR
output signal.
· No supply voltage to
IC5803. (+VccL/+VccH/-
VccL/-VccH/+Vd/-Vd).
· Replace IC5803 if found faulty.
Power Circuit 1. No +9V/-
9V/SW5V/8V/LED9V/M
010V Supply Voltage to
Main Circuit.
· IC5802 problem. (Check
pin 2,8,9,10,11 for
voltages)
· Replace IC5802 if found faulty.
2. No output SL/SR/C
signal (Check for input
signal before
troubleshooting for
IC5801.)
· IC5801 problem. (Check
pin 1,2,5 for output signal)
· Replace IC5801 if found faulty.
13.1.2. Troubleshooting Guide Part 2
Checking Points Possible Faults Possible Reasons Countermeasure
Deck Circuit 1. No PLAYBACK
(PB)/Rec signal.
· IC1001 problem. (Check
pin 23/24 for PB input, pin
5/20 for PB output).
· Q1013/Q1012 shorted to
ground with no muting
OFF.
· Q1020/Q1021 shorted to
ground with no muting
OFF.
· Replace IC1001 if necessary.
· Replace Q1013/Q1012 if necessary.
· Replace Q1020/Q1021 if necessary.
2. Bias frequency.
· L1002 /IC1004/
Q1004/Q1005 problem.
Check level of bias
frequency and oscillation.
· Replace these components if necessary when level is
below specification.
3. No supply voltage
(+B/M0+B)
· See section on Panel
Circuit.
Panel Circuit 1. FL No Display
· -Vp too low to power FL
display.
· FL Display Driver IC
problem. (IC6803)
· See section on Power Circuit.
· Replace IC6803 is faulty.
2. Error codes
· See section on error codes
(Micro-processor IC6800)
Main Circuit 1. Audio Signal (I/P &
O/P) problem.
· Check for IC2815. · Replace IC2815 if faulty.
2. Video Signal
problem.
· Refer to below section.
13.1.3. Checking of VIDEO COMPONENT OUTPUT
VIDEO
SIGNAL
Y C CR/PR/R CB/PB/B PY/Y/G
Input Pin 5 (IC2809) Pin 3 (IC2809) Pin 14 (IC2809) Pin 12 (IC2809) Pin 8 (IC2809)
VIDEO
SIGNAL
Y C CR CB/PB/B PY
Output Pin 24/25 (IC2809) Pin 32 (IC2809) Pin 17 (IC2809) Pin 19 (IC2809) Pin 21/22 (IC2809)
19
SA-VK91DGCS / SA-VK91DGCP

Terminal Defination (IC2809 - C9ZB00000377)
Pin No Pin Name Pin Description
21/22 PYOUT1/PYOUT2 Signal Output Terminal for luminance signal (progressive type)
17/19 CrOUT/CbOUT Signal Output Terminal for color-difference signal
32 COUT Signal Output Terminal for chroma signal
29/30 MIXOUT1/MIXOUT2 Signal Ouptut Terminal for Y/C Mix Signal
24/25 YOUT1/YOUT2 Signal Output Terminal for luminance signal (interlaced type)
3/12/14 CIN/CBIN/CRIN Input signal terminal for chroma signal and color difference
5/8 YIN/PYIN Input signal terminal for luminance signal
20
SA-VK91DGCS / SA-VK91DGCP