Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment MYSTERY Car Audio Mystery MDV-20 MDV-20
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Contents
Appearance ..................................................................... 4
Specification ................................................................... 6
Connection Diagram ....................................................... 7
Circuit Diagram ............................................................ 11
Circuit Operating .......................................................... 18
Block Diagram .............................................................. 23
Troubleshooting Guide .................................................. 25
PCB Pattern .................................................................. 32
Assembly/Disassembly Drawing ................................. 34
Part List ........................................................................ 36
Memo ...................................................................................................... 51
S20 / S20T / S30 / S30T SERVICE MANUAL 3
Appearance S20/S20T/S30/S30T FRONT VIEW
DISK IN/OUT
POWER EJECT
LAST NEXT
STOP PLAY
DISK IN/OUT
EJECT REMOTE SENSOR
PLAY/PAUSE
NEXT
DISPLAY LAST
WINDOW POWER
A/V INPUT
STOP
4 S20 / S20T / S30 / S30T SERVICE MANUAL
S20/S20T/S30/S30T SIDE VIEW Appearance
REMOTE EYE SENSOR INPUT JACK
SIGNAL INPUT
REMOTE EYE SENSOR INPUT JACK
SIGNAL INPUT
TV ANT INPUT
S20 / S20T / S30 / S30T SERVICE MANUAL 5
Specification
INTRODUCTION
The DVD Player supports more 500 lines horizontal resolution, Dolby digital(AC-3) and outputs digital DTS
for excellent resolution and sound as you can enjoy the effect as a real theater effect. It can also support
VIDEO CD, CD, CD-R, CD-RW .
FEATURES
- 500 and more horizontal resolution
- DVD, VCD, CD, CD-R, CD-RW
- Dolby Digital Decoding
- 2CH Analogue signal output
- DTS digital output
- Zoom
- Special Play(Slow/Fast Play)
-Composite output
SPECIFICATIONS
Basic Horizontal Resolution 500line and more
Specification Compatible Disk DVD, VCD, CD, CD-R, CD-RW
Dolby Digital Analogue 2Ch output & Digital output
Audio
DTS Digital output
Zoom OK
Volume control OK
Convenience
Special play OK
MP3 play OK
Video 1 Composite terminal
Output 2 2Ch RCA terminal(R/L, each)
Audio
1 Coaxial terminal
Connection
Video 1 Composite terminal
Input Audio 2 2Ch RCA terminal(R/L, each)
Tuner 1 RF terminal(S20T only)
Size 175 x 201 x 60(W x D x H)
6 S20 / S20T / S30 / S30T SERVICE MANUAL
S20 HARNESS CONNECTION DIAGRAM Connection Diagram
S20 / S20T / S30 / S30T SERVICE MANUAL 7
Connection Diagram S20T Harness connection diagram
TV ANT INPUT
8 S20 / S20T / S30 / S30T SERVICE MANUAL
S30 Harness connection diagram Connection Diagram
S20 / S20T / S30 / S30T SERVICE MANUAL 9
Connection Diagram S30T HARNESS CONNECTION DIAGRAM
10 S20 / S20T / S30 / S30T SERVICE MANUAL
Circuit Diagram S30/S30T FRONT
12 S20 / S20T / S30 / S30T SERVICE MANUAL
Circuit Operating SWITCHING OR CONTROL
POWER:TL494= KA7500
TL494 for switching control is fixed-frequency PWM(Pulse Width Modulation) IC and its discriminative functions are
as follows.
Table 1. Discriminative function
No Name Function
1 1 IN(+) As an error amplifier, it adjusts duty cycle to maintain its uniform output voltage, comparing with basic
2 1 IN(-) voltage and output voltage.
3 Feedback Operating with an error amplifier, it adjusts duty cycle of PWM to control output voltage
4 DTC Set the minimum dead time of switching components, Q1 and Q2 if push-pull is applied.
5 CT
Set PWM Operating Frequency
6 RT
7 GND Connect to ground for power
8 C1 Input part of output switching component 1
9 E1 Output part of output switching component 1
10 E2 Input part of output switching component 2
11 C2 Output part of output switching component 2
12 Vcc As a power supply pin, it has the operating range from 7V to 40V.
13 Output CTRL Connecting with ground to determine operating status of switching component of output part
Operate as push-pull type if it is connected with single-ended and Vref.
14 REF
This reference regulator supports stable 5V voltage(4.75~5.25V).
15 2 IN(+)
As an error amplifier, it detects and limits current.
16 2 IN(-)
By measuring current using sensing resistance, the protection against over-current was added and it maintains uniform
output voltage according to changes of input voltage by way of TRC[Time ratio control] of switching components by
comparing with voltage of output part.
18 S20 / S20T / S30 / S30T SERVICE MANUAL
FRONT(DISPLAY) Circuit Operating
CS16312EN(VFD DRIVER IC):S30 ONLY
INTRODUCTION
With following functions, IC701 realizes the serial communication with loader(built-in RL-S890/ES6008
MPEG Chip) according to software.
- CMOS Technology
- Key Scanning(12 x 4matrix)
- 8-step dimming circuitry
- Multi Display mode(16digit 12 segment ~ 8digit 20 segment)
- LED port supportable(5Ch, max 20mA)
INPUT/OUTPUT TERMINAL
- Input: receive VSTB, VCLK and VDAT from Loader(built-in RL-S890/ES6008 MPEG Chip) and scan key
input at voltage level.
- Output: output VDAT to Loader(built-in RL-S890/ES6008 MPEG Chip) and operate VFD.
DESCRIPTION OF FRONT OPERATION(S30)
Key Scan & VFD Driver(CS16312EN) Interface
DESCRIPTION OF OPERATION
- If a user presses a key while MPEG Chip(ES6008) is scanning a key thru VFD Driver(CS16312EN),
PT6300 receives key input and if it inputs serially the received data to MPEG Chip(ES6008), it analyzes and
process the command.
Operate the action according to an input command and display the corresponding information on VFD thru
CS16312EN.
S20 / S20T / S30 / S30T SERVICE MANUAL 19
Circuit Operating
PIC12F675 FUNCTION DESCRIPTION
Key Scan & VFD Driver(CS16312EN) Interface
By the command of KEY or IR, data is analyzed and processed through LOADER(RL-SL820)
MPEG(ES6008) IR INPUT terminal.
FUNCTION DESCRIPTION
- If the user presses KEY while MPEG Chip(ES6008) is giving KEY INPUT command through PIC12F675,
the CPU, KEY is put in from PIC12F675, data is serially put in to MPEG Chip(ES6008), and the
corresponding command is analyzed and processed.
The function in accordance with the command is performed, and the corresponding information is displayed
on the monitor.
20 S20 / S20T / S30 / S30T SERVICE MANUAL
A/V Circuit Operating
2CH AUDIO
INTRODUCTION
Receive FR and FL signals from MPEG Chip(ES6008), amplify(U101) them to output analogue signals to 2CH
Jack(J101). Receive the outputted digital signal from MPEG Chip(ES6008) and output digital signal by coaxial
jack(J108).
OP-AMP:IC(U101):4560
INTRODUCTION
Dual Operating Amplifier
FUNCTIONS
Amplify the analog voice signal from D/A converter IC.
Taking right/left channel each, amplify and output these two channel to J101.
INTERNAL BLOCK DIAGRAM
S20 / S20T / S30 / S30T SERVICE MANUAL 21
Circuit Operating
SWITCHING IC:(U102):4053
INTRODUCTION
Select DVD output and external input and finally output them.
FUNCTIONS
When the power is on, it is inputted as IC PIN No. 9, 10 and 11 at LOW(0V) AUX CONT voltage and audio
and video signals are outputted while the power is off, it is inputted as IC PIN No. 9, 10, and 11 at HIGH(12V)
AUX CONT and the audio and video from external input are selected and finally outputted.
INTERNAL BLOCK DIAGRAM
TRUTH TABLE
INH A B C ONSWITCH
L L L L XO YD ZO
L H L L X1 YD ZO
L L H L XO YD ZO
L H H L X1 Y1 ZO
L L L H XO YD Z1
L H L H X1 YD Z1
L L H H XD Y1 Z1
L H H H X1 Y1 Z1
L X X X NONE
22 S20 / S20T / S30 / S30T SERVICE MANUAL
S20/S30 Block Diagram
S20 / S20T / S30 / S30T SERVICE MANUAL 23
Block Diagram S20T/S30T
24 S20 / S20T / S30 / S30T SERVICE MANUAL
POWER CIRCUIT Troubleshooting Guide
Power Error
NO
Impressed power on
Impress power.
signal input edge?
Yes
Are voltages at both NO
ends of C825 measured Check U851 and Q811.
between 11V~15V?
Yes
NO
Are T801(Power trans) and
Check U851 circuit and Power trans.
secondary yield normal?
Yes
Are T801, secondary rectifying NO Replace secondary rectifying
diode;SB560 (D802, D803, diode;SB560.
D804 and D805) normal?
Yes
NO
Are +9V and +12V yielded For +9V trouble check U801 and T809
normally? For +12V trouble check if L801 is disconnected.
Yes
NO
Are +5V and +3.3V yielded For +5V trouble check L802 and ZD802
normally? For +3.3V trouble check T8 and R33.
Yes
END
S20 / S20T / S30 / S30T SERVICE MANUAL 25
Troubleshooting Guide FRONT CIRCUIT(S30/S30T Only)
VFD letters not indicated or indicated with errors
Is-20V impressed on P102 FL(+) NO Check Power circuit
edge and -18V on FL(-) edge? Check U101.
Yes
Is 5V impressed with NO Check P703 5pin and Power circuit
IC701 14pin? 5V edge.
Yes
NO
Is -26V impressed with Check P703 10pin and Power
IC701 34pin? circuit 26V edge.
Yes
Any oscillation to NO
Check IC701.
IC701 52pin?
Yes
NO Check IC701 pins
Don't certain GRID/SEGs do not
function? from 40pin~44pin.
Yes
NO Check IC701 pins
Is GRID yielded from IC701
PORT? from 15PIN~30PIN.
Yes
NO
Is GRID yielded from IC701 Replace IC701.
PORT?
END
26 S20 / S20T / S30 / S30T SERVICE MANUAL
AUDIO CIRCUIT Troubleshooting Guide
ANALOG OUT
CAUTION
Before checking audio circuit check
configurations on SETUP MENU with the
remote control first.
2CH AUDIO does
not work
Is RCA Cable properly NO
connected to signal input edge? Connect RCA Cable to Audio OUT edge.
Yes
Is AUDIO waveform of NO Check U102
U102(BU4053) 3pin and 13pins Check power.
yielded?
Yes
Is AUDIO waveform of NO Check 7pinand 1pins of U101
U102(BU4053) 1pin and 12pins? (LM4560).
Yes
Are R and L signals of U101 put in? NO Check connection cable on
(LM4560) 2pin, 3pin, 5pin and 6pins PCB P102 edge.
Yes
NO Check PCB P102 edge and Loader
Is AUDIO yielded from CN4 connection cable and replace
Loader(SL-820)? them if necessary.
Yes
END
S20 / S20T / S30 / S30T SERVICE MANUAL 27
Troubleshooting Guide AUDIO CIRCUIT
DIGITAL OUT
AUDIO does not function through
COAXIAL JACK (J108)
NO
Is Receiver set on COAXIAL Change Receiver mode.
MODE?
Yes
NO
Does P102 8pin make AUDIO Check Loader (RL-S820).
DIGITAL signals?
Yes
COAXIAL JACK
(Check A/V Cable)
CAUTION
Before checking coaxial circuit check
its connection with Receiver first.
28 S20 / S20T / S30 / S30T SERVICE MANUAL
VIDEO CIRCUIT Troubleshooting Guide
Image signals are not made
(VIDEO OUT)
Is TV method of SET UP NO Match either NTSC/PAL method
MENU set in accordance with with TV setting.
NTSC/PAL methods?
Yes
NO
Does Main P.C.B P102 port Check cable connected to P102.
make VIDEO signals?
Yes
NO
Does U102(BU4053) 4pin make Check U102(BU4053) and signals
VIDEO signals? put in to 5pin.
Yes
Is there yielded waveform on NO
Check Q591(KTA1504).
Q591(KTA1504) emitter edge?
Yes
END
CAUTION
Before checking audio circuit check
configurations on SETUP MENU with the
remote control first.
S20 / S20T / S30 / S30T SERVICE MANUAL 29
Troubleshooting Guide TUNER CIRCUIT(S20T/S30T Only)
CAUTION
Before checking tuner circuit check first if
SET UP mode is TV mode.
No image appears on TV
(VIDEO OUT)
NO
Is ANT CABLE (JACK)
Connect ANT CABLE (JACK).
connected properly?
Yes
Was tuner selected with NO
DVD/TUNER/AUX KEY in Change mode into tuner mode,
remote control?
Yes
Is signal put into U502(N NO NO
Are signals 10pin and 11pin of Replace tuner.
JM2246M) 3pin?
tuner yielded?
Yes
Yes
Check cable tuner connection.
NO Check X 531 X-TAN oscillation
Is VIDEO signal yielded to
U503(KS155414B) 16th and 24th pins
U503(KS155414B) 15pin?
Vcc Check.
Yes
NO
Is there yielded VIDEO signal on
Check Q591(KTA1504).
Q591(KTA1504) emitter edge?
Yes
Check R593(75ohm)
L595(10mH).
30 S20 / S20T / S30 / S30T SERVICE MANUAL
Troubleshooting Guide
TV sounds are not produced(AUDIO)
Is TV set on mute or NO
Adjust mode
volume on 0?
Yes
Is tuner selected on NO
DVD/TUNER/AVX KEY Select TUNER mode
in remote control?
Yes
NO
Does U571(LM4560) 1st pin Check U571(LM4560) and
produce sounds? Q570(KTC3875)
Yes
Is signal put into TU1(115-V- NO Check U501(PIC16C72A) and
F025AT) 10th and 11th U502(KLM2246)
pins(CLK, DATA)?
Yes
Is voltage impressed to TU1(115-V- NO
Check Power edge
F025AT) TUNER normal? (13pin-5V,
15pin-30V)
Yes
END
S20 / S20T / S30 / S30T SERVICE MANUAL 31
PCB Pattern FRONT PCB(S20/S20T/S30/S30T)
32 S20 / S20T / S30 / S30T SERVICE MANUAL
MAIN PCB(S20/S20T/S30/S30T) PCB Pattern
S20 / S20T / S30 / S30T SERVICE MANUAL 33
Assembly/Disassembly Drawing S20 / S20T
34 S20 / S20T / S30 / S30T SERVICE MANUAL
S30/S30T Assembly/Disassembly Drawing
S20 / S20T / S30 / S30T SERVICE MANUAL 35
Part List S20/S20T FRONT ASS' Y
NO. LOCATION PART CODE PART-DESCRIPTION PACKAGE S20 NOTE
1 D701 RED LED ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo