Emerson MD1777 User manual

SERVICE MANUAL
IN CAR DVD-VIDEO PLAYER
MD1777
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE "SAFETY
PRECAUTIONS", IN THIS MANUAL.

• Safety Check after Servicing
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires
have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in
order to verify compliance with safety standards.
1. Insulation resistance test
Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts
of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone
jacks, etc.). See table below.
2. Dielectric strength test
Confirm specified dielectric strength or greater between power cord plug prongs and exposed accessible parts of the
set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks,
etc.) See table below.
3. Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between soldered
terminals, and between terminals and surrounding
metalic parts. See table below.
Table 1: Rating for selected areas
* Class II model only.
Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country
and locality.
4. Leakage current test
Confirm specified or lower leakage current between B (earth ground, power cord plug prongs) and externally
exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone
jacks, earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B (earth ground, power cord plug
prongs) and exposed accessible parts. Use and AC
voltmeter to measure across both terminals of load Z.
See figure and following table.
Table 2: Leakage current ratings for selected areas
Note: This table unofficial and for reference only. Be sure to confirm the precise values for your particular country and
locality.
Z
Exposed
accessible
part AC Voltmeter
(high impedance)
Earth Ground
power cord plug prongsB
Fig. 2
AC Line Voltage Region Insulation Dielectric Clearance
Resistance Strength Distance (d), (d')
100V Japan ≥1 MΩ/500 V DC 1kV 1 minute ≥3 mm
110 to 130V USA & – – – 900V 1 minute ≥3.2mm
Canada
* 110 to 130 V Europe ≥10 MΩ/500 V DC 4 kV 1 minute ≥6 mm (d)
200 to 240 V Australia ≥8 mm (d')
(a: Power cord)
Fig. 1
d
Primary circuit terminals
Chassis
d'
a
AC Line Voltage Region Earth Ground
Load Z Leakage Current (i) (B) to:
100V Japan ¡ ≤1m A rms Exposed accessible
parts
110 to 130 V USA & ¡ ≤0.5 m A rms Exposed accessible
Canada parts
¡ ≤0.7 m A peak Antenna earth
110 to 130 V Europe ¡ ≤2 m A dc terminals
200 to 240 V Australia ¡ ≤0.7 m A peak Other terminals
¡ ≤2 m A dc
1k
1.5k
1.5kµF
2k
50k

TOTAL CONTENTS
1
SECTION 1. GENERAL....................................................................................................................2
SECTION 2. CABINET & MAIN FRAME.........................................................................................6
SECTION 3. ELECTRICAL ............................................................................................................10

SECTION 1. GENERAL
2
CONTENTS
1-1. SPECIFICATIONS............................................................................................................................3
1-2. IDENTIFICATION AND OPERATION OF CONTROLS...............................................................4

* Design and specifications subject to change without notice.
1-1. SPECIFICATIONS
3
Power DC 12V Negative Ground
Consumed electricity 24W (supplementary 2.5W)
Weight 5.3kg
Dimension (WxHxD) 250mm x 135mm x 266.5mm
Operative temperature 5¡C ~ 35¡C
Installation condition Horizontal / Relative humidity under 80%
Signal type NTSC COLOR
VIDEO input 1.0Vp-p unbalanced, RCA JACK
AUDIO input -8.8dBm, RCA JACK
VIDEO output VIDEO output terminal, 1.0Vp-p unbalanced, RCA JACK
AUDIO output Audio output terminal (2 kinds): -7.8dBm(VCP), 2.0Vrms(DVD), RCA JACK
Playable tape Very high density tapes with VHS marks
Playable disc DVD, VIDEO-CD, CD (12mm), CD (8mm), MP3, CD-R, CD-RW, DVD-RW, DVD+RW
Tape speed SP: 33.35mm/s, SLP: 11.12mm/s
Playtime SP: 2hrs, SLP: 6hrs (use of T-120 tape)
VIDEO S/N (VCP) Over 43dB (Standard recording)
Resolution VCP Over 220 lines (Standard recording)
DVD Over 500 lines (DVD Disc PLAY)
AUDIO (VCP) Over 40dB
AUDIO (DVD) 80dB
AUDIO dynamic range 90dB

1-2. IDENTIFICATION AND OPERATION OF CONTROLS
4
!@#$ %^ &*
()
1
2
“
09876 543
!SOURCE
UsetochangeDVD mode to VCP andviceversa.
@MENU
Usedtodisplay the contentsmenuof the loadedDVDdisc.
Thisfunctionis disc dependent.ADVD disc maynot
containacontents menu.
# Cursor LEFT/RIGHT
Usedtomove to thedesiredmenu. Also canbeusedto
displayfunction.
$ ENTER
% Place to insert disc
^ Cursor UP/DOWN
Usedtomove to thedesiredmenu.A lso canbeusedto
displayfunction.
& PREVIOUS
Usedtomove to thepreviouschapter (DVD)or track(VCDor
CDDA)fromthecurrent chapter ortrack.Pressing this
buttonshowsprevious play listwhenplaying VCD with
PBC.
* NEXT
InDVD,usedto move tothenext chapter (DVD)ortrack
(VCDorCDDA)from the currentchapteror track. Pressing
thisbuttonshows next playlistwhen playing VCDwith
PBC.
InVCP,usedto watch aseriesof screens onebyone
(FrameAdvance).
( DISC EJECT
Toejecta disc ortape,pressEJECT button.
) Remote control receiver
1 Place to insert video tape.
2 AV JACK
Connectthesejacks to theaudio/videoout jacks terminal
ofyourGame machine orCamcorderusing the RCAcord
provided.
3 EJECT
Toejecta disc ortape,pressEJECT button.
4 AV.SW
AV.SWisused to displayeachoutput screen ontheTV
monitorbymatching each screenwithoutput source.
5 TRACKING -/+
Usetoadjust the displaysuitablefor warching.
6 FF
Toplaya disc ortapefast forward.While Paused,this
buttonwillplay slow forward.
7 PLAY.PAUSE
Usethisbutton to playorpause the disc(ortape).Pressing
thisbuttonduring play,causes thedisc(or tape)to pauseif
inpausemode it functionsasthe PLAY button.
8 REW
Toplaya disc ortapefast reverse.While Paused,this
buttonwillpaly slow reverse.(DVDonly)
9 STOP
Tostopthe current playingmode,pressSTOP. When using
VIDEOCD2.0,CVDand SVCD withPBCfunction included,
thisbuttonworks as aRETURNbutton.
TostopPBC, disc, usePBCbutton.
0 POWER/STANDBY
Activatestheunit POWER ONorSTANDBY.
“ Operation indicator
(DVDindicator,DISCIN indicator,VCP indicator.Cassette
IN/AutoREPEATindicator,DEW/Hi-Fi indicator)

5
!
@# $ %
NOTE: This VCP is for 12Vdc use only; DO NOT use in 24Vdc vehicles. If you use this unit in a 24Vdc vehicle, all the
indicator lamps will blink indicating a major malfunction. Disconnect the plug from the power source
immediately.
!Infrared(IR)INPUTConnector
ThisconnectorprovidesatwowireinterfacewithvariousFlexvisionvideomonitor
products.
*Connectordescription
@Infrared(IR)INPUTConnector(RemoteEye)
Thisconnectorprovidesathree-wireinterfacewithreceiveraccessory.(RemoteEye).
(P/N136-2070)
#AUDIO/VIDEOINConnector
TheseconnectorsprovideaninterfacetotheAUDIO/VIDEOOUTconnectorsofyour
GamemachineorCamcorderusinganRCAcord.
$DC12VJack
WhenusingaDCpowersource,connectthisjackto12VDC.
*Connectordescription
%AUDIO/VIDEOOUTConnectors
TheseconnectorsprovideaninterfacetotheAUDIO/VIDEOINconnectorsofyour
videomonitor,usinganRCAcord.

SECTION 2. CABINET & MAIN FRAME
6
CONTENTS
2-1. EXPLODED VIEW............................................................................................................................7
1) MAIN CHASSIS
2) PANEL FRONT
2-2. PACKING ASSEMBLY....................................................................................................................9

2-1. EXPLODED VIEW
7
1) MAIN CHASSIS ASS'Y
T1
9

8
2) PANEL FRONT ASS'Y
5
6
7
8
10
15

9
2-2. PACKING ASSEMBLY

SECTION 3. ELECTRICAL
10
CONTENTS
3-1. ELECTRICAL ADJUSTMENT......................................................................................................11
1) SERVO-LOGIC CIRCUIT ADJUSTMENT METHOD
3-2. CIRCUIT DIAGRAMS....................................................................................................................12
1) CONNECTION DIAGRAM
2) POWER CIRCUIT DIAGRAM
3) SERVO SYSCON CIRCUIT DIAGRAM
4) VIDEO & AUDIO CIRCUIT DIAGRAM
5) HI-FI CIRCUIT DIAGRAM
6) A/V IN/OUT CIRCUIT DIAGRAM
3-3. COMPONENTS LOCATION GUIDE ON PCB............................................................................18
3-4. ELECTRICAL PARTS LIST..........................................................................................................20

1) SERVO-LOGIC CIRCUIT ADJUSTMENT METHOD
• VIDEO HEAD SWITCHING POSITION
1) Play back the test tape.
2) Set the oscilloscope in the CHOP mode connect the CH1 to SW pluse PT01 3 PIN the CH2 to VIDEO OUT with CH1
triggering.
3) Press the “REC” button of Jig Remocon to make that playback phase of vertical sync from the rising edge of SW pulse
is 6.5H ±0.5H .
3-1. ELECTRICAL ADJUSTMENT
11
Adj. Location Checking Point Measuring Equipment Mode Test Tape
REC Button(Jig Remocon) PT01 3 PIN Oscilloscope Play DN-2
VIDEO OUT
SWITCHING
SW30Hz
PULSE
VIDEO
OUTPUT
V. SYNC
6.5H±0.5

3-2. CIRCUIT DIAGRAMS
12
1) LOGIC CIRCUIT DIAGRAM (DV5T721NY)

13
2) POWER CIRCUIT DIAGRAM (DV5T711NY)

14
3) SERVO SYSCON CIRCUIT DIAGRAM (DV5T711NY)

15
4) VIDEO& AUDIO CIRCUIT DIAGRAM
FM PROCESSING

16
5) HI-FI CIRCUIT DIAGRAM (DV5T711NY)

17
6) A/V IN/OUT CIRCUIT DIAGRAM

3-3. PRINTED CIRCUIT BOARD
18
1) PCB MAIN