Mitsubishi HD-4001 Service manual
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20052005
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MITSUBISHI ELECTRIC
ManualManual
Manual
ManualManual
SET TOP BOX
V26K CHASSIS
MODEL
HD-4001
RECEIVER/CONTROLLER
FOR MODELS LT-3280 & LT-3780
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
SPECIFICATIONS
• Power Input : AC 120V, 60Hz
• Power Usage
• Frequency Range : VHF 54 ~ 470MHz
• Antenna Input : 2 RF 75Ω unbalanced
• Tuning : 1 NTSC/A TSC/QAM
• Cabinet Dimensions : 17"(W) x 3.7"(H) x 17.25"(D)
• Weight : 12.8 lbs
• Analog Input : VIDEO IN JACK (RCA Type)
Levels 1.0Vp-p 75Ω unbalanced
: 82W
UHF 470 ~ 806MHz
Analog Cable - 1 ~ 125
Digital Cable - 1 ~ 135
1 CableCARD™ Slot
1 NTSC for PIP
: AUDIO IN JACK (RCA T ype)
-4.7dBm 43kΩ unbalanced
: S-VIDEO IN JACK
(Y/C separate type)
Y:1.0 Vp-p C:0.286Vp-p(BURST)
75Ω unbalanced
: COMP / Y , Cr, Cb (RCA T ype)
Y: 1.0 Vp-p Cr, Cb: 700mVp-p
• Output Level : VIDEO OUT JACK (RCA T ype)
1.0Vp-p 75Ω unbalanced
: AUDIO OUT JACK (RCA T ype)
-4.7dBm 4.7kΩ unbalanced
• Digital : IEEE-1394 I/O Jacks
Interface : AC-3 Digtal Audio Output
: HDMI™ Input
: MonitorLink
: CableCARD™ Slot
: NetCommand®
.
TM
Control/RS-232C
• Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2005 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
MODEL: HD-4001
CONTENTS
INTRODUCTION ................................................................................................................................5
PRODUCT SAFETY NOTICE .............................................................................................................5
SAFETY PRECAUTIONS ...................................................................................................................6
PWB-LOCA TIONS .............................................................................................................................7
DISASSEMBL Y .................................................................................................................................. 8
T op Cover removal ..................................................................................................................8
PWB-SIGNAL & PWB-TERMINAL Removal........................................................................... 9
Signal Bracket Removal ....................................................................................................... 10
Rear Panel Removal............................................................................................................. 11
Card Reader Removal & Front Panel Removall .....................................................................12
ELECTRICAL ADJUSTMENTS ........................................................................................................ 13
Equipment .................................................................................................................................... 13
Option Menu / Initialization Defaults / AV Defaults......................................................................... 1 4
LED Diagnostics ........................................................................................................................... 15
Remote Control Operational Mode ................................................................................................15
Circuit Adjustment Mode ...............................................................................................................16
Transfering data ............................................................................................................................ 17
Adjustment Items List................................................................................................................... 17
Adjustment Procedures ................................................................................................................18
Test Points .......................................................................................................................... 18
Main-Y Gain......................................................................................................................... 18
Sub-Y Gain .......................................................................................................................... 19
Sub Picture Offset ...............................................................................................................19
CHIP P ARTS REPLACEMENT ......................................................................................................... 20
REPLACEMENT P ARTS .................................................................................................................. 21
Parts Ordering ..............................................................................................................................21
Critical and Warranty Parts Designation........................................................................................21
Parts T olerance Codes.................................................................................................................. 21
SERVICE PARTS LIST ....................................................................................................................22
CIRCUITRY BLOCK DIAGRAMS ..................................................................................................... 31
St andby Power Supplies ............................................................................................................... 31
PWB-DM Power Supplies ............................................................................................................. 32
PWB-SIGNAL Switched Power Supplies ......................................................................................32
Tuners & Analog Video Select Circuitry......................................................................................... 33
Digital Video Signal Path .............................................................................................................. 34
Sync Signal Selection..........................................................................................................
Sync Signal Output Path .............................................................................................................. 35
Sound Signal Path ........................................................................................................................36
Control Circuitry ............................................................................................................................ 37
Command Input Circuitry............................................................................................................... 38
Macrovision Detection................................................................................................................... 38
......... 35
Page 3
MODEL: HD-4001
Part 2
Schematic Diagrams
CONTENTS Page
SCHEMA TIC DIAGRAMS
Overall PWB Interconnect Diagram .................................................................................................1
POWER / E2P / CONTROL / MV Decoder] ....................................................................................2
TERMINAL-1 / TERMINAL-2 [Inputs / Outputs] ...............................................................................3
SIGNAL-1 [Video Switch]................................................................................................................4
SIGNAL-2 [Decoder / Switch]..........................................................................................................5
SIGNALS-3 [Micro} .........................................................................................................................6
SIGNAL-4 [TVGO] ..........................................................................................................................7
SIGNAL-5 [MPEG Encoder]............................................................................................................8
SIGNAL-6 [HDMI RX] ...................................................................................................................... 9
SIGNAL-7 [HDMI TX]..................................................................................................................... 10
SIGNAL-8 [Video Output]............................................................................................................. 11
SIGNAL-9 [IR232] ......................................................................................................................... 12
TUNER-1 [ATSC / NTSC Tuner] .................................................................................................... 13
TUNER-2 [Main A TSC / NTSC Demodulators] ...............................................................................14
PWB LA YOUT DIAGRAMS .............................................................................................................. 15
Page 4
MODELS: HD-4001
INTRODUCTION
This service manual provides service instructions for STB model HD-4001 which uses the V26K chassis. Service
personnel should read this manual thoroughly before servicing these chassis.
This service manual includes:
1. Safety Precautions
2. Assembly and disassembly instructions.
3. Servicing printed circuit boards (PCBs).
4. Electrical adjustments.
5. Chip parts replacement procedures.
6. Circuit path diagrams.
The parts list section of this service manual includes:
1. Cabinet and screen parts.
2. Electrical parts.
Schematic and block diagrams of the above listed models are included in this service manual for better understanding
of the circuitry . PCB drawings are also included for easy location of part s and test points.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by
using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have special safety characteristics are identified in this service manual.
Electrical components having such features are identified by shading on the schematic diagrams and by bold type in
the parts list of this service manual. and by marking on the supplementary sheet for this chassis to be issued subsequently. The replacement for any safety part should be identical in value and characteristics.
CableCARD is a trademark of Cable T elevision Laboratories, Inc.
TV Guide On Screen is a registered trademark of Gemstar Development Corp.
HDMI is a trademark of HDMI Licensing, LLC.
Page 5
MODELS: HD-4001
SAFETY PRECAUTIONS
NOTICE: Observe all cautions and safety related notes located inside the receiver cabinet and on the
receiver chassis.
WARNING:
1. Operation of this receiver outside the cabinet or with the cover removed presents a shock hazard
from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is
not thoroughly familiar with the precautions necessary when working on high voltage equipment.
2. When service is required, observe the original lead dress. Extra precaution should be taken to
assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those
components that indicate evidence of overheating.
Leakage current check
Before returning the receiver to the customer, it is recommended that leakage current be measured according to the
following methods.
1. Cold Check
With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug
prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed met al part
(i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay , control shaft s, etc.), particularly any
exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a
return path to the chassis should be a minimum of 1Mega Ohm. Any resistance below this value indicates an
abnormal condition and requires corrective action.
2. Hot Check ...Use the circuit shown below to perform the hot check test.
1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after
connection, and with the switching devices of the receiver in their operating positions, measure
the leakage current for both positions of switch S2.
2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the
switching devices of the receiver in their operating positions, measure the leakage current for both
positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has
reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).
Page 6
MODELS: HD-4001
PWB-LOCATION
PWB
CONTROL
PWB
POWER
FAN
PWB
CARD
READER
PWB-SIGNAL
(Top)
TERMINAL1
PWB
PWB-DM
(Under Signal)
Page 7
PWB
TUNER
PWB
TERMINAL2
MODELS: HD-4001
DISASSEMBLY
TOP COVER REMOVAL
Top Cover
Page 8
SIGNAL-PWB
REMOVAL
MODELS: HD-4001
SIGNAL
PWB
PWB-SIGNAL
TERMINAL-PWB
REMOVAL
PWB
TERMINAL1
PWB
TERMINAL2
Page 9
MODELS: HD-4001
SIGNAL BRACKET REMOVAL
FAN
SIGNAL
BRACKET
PWB
Support
Post
Page 10
MODELS: HD-4001
REAR PANEL REMOVAL
Page 11
PWB
FAN
CARD READER REMOVAL
MODELS: HD-4001
FRONT PANEL REMOVAL
FRONT
Front bracket
BRACKET
FRONT
COVER
Front Cover
(Remove Lower
snaps first)
Control PWB
PWB
CONTROL
Page 12
MODEL: HD-4001
ELECTRICAL ADJUSTMENTS
Note: Perform only the adjustments required.
Do not attempt an alignment if proper equipment is not available.
Test Equipment
• Oscilloscope (Unless otherwise specified, use 10:1 probes)
• Signal Generator (both SD and HD capable)
Test Signal
A. Monoscope Signal
Note: If you do not have
a monoscope signal source,
connect the unit to a VCR
and play a Monoscope
*alignment tape.
(* Part Number: 859C568060)
B. Color Bar Signal
Use the color bar signal shown
below , unless otherwise specified
in this manual.
Monoscope Signal
Page 13
MODEL: HD-4001
V
OPTION MENU
1. Press the “MENU” button on the remote hand unit.
2. Press the buttons “2”, “4”, “7” and “0” in order.
(The screen will change to the option menu.)
DEFAULTS
Defaults After Initialization
Captio ns Menu (conti nued)Setup Menu
Language :English Background :Gray
Color Balance -- Digital Captions :On if Mute A/V Memory Reset :Ant-1
Side Bar Color :Gray Appearance :Default Audio
NetCommand Menu
Edit -- Font :Font 3 Treble :50%
Transpor t Menu :O n Size :Large Balance :50%
Default PVR -- Col o r :White Surround :Off
Icon Order -- Background :Black Listen To (Analog Only) :Stereo
Analog Quality :High Opacity :Tran slucent Level Sound :On
An t enna Menu
Antenna :1 Video
Memorize -- V-Chiip :Off Contrast :50%
Prefer Digital -- TV Rating :TV-PG Brightness :50%
Channel :3 FV-Fantasy Violenc e :Enable Sharpness :50%
Memory :Deleted D-Sexual Dialog :Enable Color :50%
Name -- L-Adult Language :Enable Tint :50%
SQV -- S-Sexual Situations :Enable Video noise :Standard
Time Menu
Clock Setting :Manual Programs N ot R ate d :Enable Video Mute :On
Time :12:00AM Movie Rating :PG Back Lig ht :100%
Date :1 /0 1/00 V-C h ip Time
Time Zone :Eastern Start :12:00pm
Daylight Savings Time :Applies Stop :12:00pm PIP Position :Lower Right
Timer --
Captions Menu
Analog Captions :O n if M ut e Lock Time :12:0 0pm
Digital Settings Bass :50%
Background Opacity :Translucent Language (Digital Only) :English
V-Chip Lock Menu
V-Violence :Enable Film Mode (Auto) :On
Lock by Time
Lock by Time :Of f PIP/POP Format :Double Window
Unlock Time :12:00pm
Audio / Video
TV Volume
PIP Source
POP Posi ti on
Format
:30%
:Ant-1 003
:Right Half
:Stretch
A/ V Function Ant 1 /2 Input 1/2
Contrast
Brightness
Sharpness
Color
Tint
ideo no is e
Backlight
Film Mo de ( Auto)
Bass
Treble
Balance
Surround
Listen To
Level Soun d
Center Center Center Center Center
Center Center Center Center Center
Center Center Center Center Center
Center Center Center Center Center
Center Center Center Center Standard
Standard Standard Standard Standard Standard
Max Max Max Max Max
On On On On On
Center Center Center Center Center
Center Center Center Center Center
Center Center Center Center Center
Off Off Off Off Off
Stereo N/A N/A N/A N/A
On On On On On
Component
1/2
HDMI 1/2 1394
NOTE: User Menu A/V Reset, resets only the selected input A/V settings.
Page 14
MODEL: HD-4001
A. A/V Memory
Each of the external inputs has its’ own Audio/Video Memory. A change in an A/V setting at a specific input is
stored in memory for that specific input.
B. A/V Reset
The AV Reset in the user’s menu initializes only the selected input’s A/V Memory .
LED Indicator Diagnostics
The “POWER/TIMER” LED provides an indication of the sets operation, and the possible cause of a malfunction.
1. Initial Control Circuitry Check
Immediately after the TV is connected to an AC power source:
LED Indi c a t ions Condit ions Probable C aus e
Off After AC is applied Standby Power Supply or TV µPC not running
Fast Bllink for 70 sec. After AC is applied Normal DM µPC is booting up
Fast Blink (doesn't stop) After AC is applied DM µPC failed to boot up
Slow Blink Set in Off Normal - Timer is set for Automatic Turn ON
2. Error Code Operational Check
Note: The Set T op Box must be in “Shut Down” and not have been switched Of f, to perform the Error Code
Operational Check. When the unit is switched Off, the code automatically resets to “12” No Error .
Pressing the front panel “DEVICE” and “MENU” buttons at the same time, and holding for 5 seconds,
activates the Error Code Mode. The LED flashes denoting a two digit Error Code, or indicating no problem
has occured since the last Initalization.
Note: The front panel buttons must be used, NOT those on the Remote Control.
• The number of flashes indicates the value of the MSD (tens digit) of the Error Code.
• The flashing then pauses for approximately 1/2 second.
• The LED then flashes indicating the value of the LSD (ones digit) of the Error Code.
• The Error Code is repeated a total of 5 times.
Example: If the Error Code is “23”, the LED will flash two times, pause, and then flash three times.
4. Error Codes
The Error Code designations indicating malfunction, or no malfunction, are listed below:
Error Code Prob able Cause
12 Normal Operation - No Error Detected
35 Fan Stopped
41 Short Detected
Remote Control Operational Modes
There are two Remote Hand Unit Operational Modes, “Standard” and “NetCommandTM”. The Remote is initially
in the “Standard” mode. The “NetCommandTM” mode is used when controlling Home Theater devices using
NetCommandTM. To change the Remote Operational Mode:
• Set the Remote to the CABLE/DBS/DTV Layer.
• Point the Remote away from the STB.
• To change to “Netcommand
TM
” ... Hold the “Power” button and press “1-9-7” in sequence.
Page 15
MODEL: HD-4001
CIRCUIT ADJUSTMENTS
:
Electrical Adjustments
Electrical Adjusment s are performed in Service Adjustment Mode.
1. Activating the adjustment mode
1. Press the “MENU” button on a remote hand unit.
(The “MENU” display will appear .)
2. Press the buttons “2”, “4”, “5” and “7” in that order . (The screen will change to the adjustment mode.)
If not changed to the adjustment mode, repeat steps 1 and 2.
2. Adjustment Function Selection
Use the “AUDIO” button to select a specific Adjustment Function.
AD9883A
Functions
SMTX MMTX
3. Adjustment Selection
Use the “VIDEO” button to select a specific elecrtrical ajustment.
4. Adjusting Data
After selecting an adjustment item, use the “UP” and “DN” buttons to change adjustment data.
ª If the “UP” button is pressed, the adjustment data increases.
ª If the “DN” button is pressed, the adjustment data decreases.
5. Saving data
Press “ENTER” to save the adjustment data in memory .
The display characters go red for approx. one second in this step.
Note: If the circuit adjustment mode is terminated without pressing
“ENTER”, changes in adjustment data are not saved.
6. T erminating the circuit adjustment mode
Press the “MENU” button on the remote hand unit twice to terminate the adjustment mode.
Note: The adjustment mode can be also terminated by turning the
power off.
Page 16
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