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Hitachi HTD-K185UK Service Manual

Dvd av receiver and digital terrestrial tv receiver
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Download this manual See also: Instruction Manual
CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise" und „Hinweise
zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
DVD AV Receiver and Digital Terrestrial TV Receiver
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
October 2004
SM0154
HTD-K185UK
Data
contained
within
this
manual is subject to alteration for
improvement.
Les données fournies dans le présent
manuel d'entretien peuvent faire l'objet
de modifications en vue de perfectionner
le produit.
Die
in
diesem
Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
Service

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Summary of Contents for Hitachi HTD-K185UK

  • Page 1 SM0154 HTD-K185UK SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual. Data contained within this Service manual is subject to alteration for improvement.

  • Page 2: General Description

    A) HARDWARE 1. GENERAL DESCRIPTION 1.1 MT1379 The MT1379 Progressive Scan DVD-Player Combo Chip is a single-chip MPEG video decoding chip that integrates audio/video stream data processing, TV encoder, four video DACs with Macrovision, copy protection, DVD system navigation, system control and housekeeping functions.
  • Page 3 1.2 Memory SDRAM Memory Interface The MT1379 provides a glueless 16-bit interface to DRAM memory devices used as OSD, MPEG stream and video buffer memory for a DVD player. The maximum amount of memory support is 16 MB of Synchronous DRAM (SDRAM). The memory interface is configurable in depth to support 128-Mb addressing.
  • Page 4 2. SYSTEM BLOCK DIAGRAM AND MT1379 PIN DECRIPTION 2.1 MT1379 Pin Description Pin Number Symbol Type Description IREF Analog Input Current reference input. It generates reference current for data PLL. Connect an external 100K resistor to this pin and PLLVSS. PLLVSS Ground Ground pin for data PLL and related analog circuitry...
  • Page 5 Microcontroller address/data 7 Inout 2-16MA, Microcontroller address/data 6 Inout 2-16MA, Microcontroller address/data 5 Inout 2-16MA, Microcontroller address/data 4 Inout 2-16MA, DVDD3 Power 3.3V power pin for internal digital circuitry Microcontroller address/data 3 Inout 2-16MA, Microcontroller address/data 2 Inout 2-16MA, Microcontroller address/data 1 Inout 2-16MA, Microcontroller address/data 0 Inout 2-16MA,...
  • Page 6 APLLVDD3 Power 3.3V Power pin for audio clock circuitry Microcontroller address latch enable Inout 2-16MA, SR PU, SMT IOOE# Flash output enable, active low / IO Inout 2-16MA, SR SMT IOWR# Flash write enable, active low / IO Inout 2-16MA, SR SMT IOCS# Flash chip select, active low / IO...
  • Page 7 Inout DRAM data 3 Inout DRAM data 2 Inout DRAM data 1 Inout DRAM data 0 RWE# DRAM Write enable, active low Output 2-16MA, SR CAS# DRAM column address strobe, active low Output 2-16MA, SR RAS# DRAM row address strobe, active low Output 2-16MA, SR RCS#...
  • Page 8 DRAM address 6 Output 2-16MA, SR DRAM address 5 Output 2-16MA, SR DRAM address 4 Output 2-16MA, SR DVSS Ground Ground pin for internal digital circuitry DQM1 Mask for DRAM input/output byte 1 Output 2-16MA, SR DQMO Mask for DRAM input/output byte 0 Output 2-16MA, SR DRAM bank address 0...
  • Page 9 RD23 Inout 2-16MA, DRAM data 23 / Videoin SR PU/PD, Data PortA 7 RD22 Inout 2-16MA, DRAM data 22 / Videoin SR PU/PD, Data PortA 6 DVDD2 Power 2.5V power pin for internal digital circuitry RD21 Inout 2-16MA, DRAM data 21 / Videoin SR PU/PD, Data PortA 5 RD20...
  • Page 10 YUVO/CIN Output Video data output bit 0 / Compensation capacitor 4MA, SR DACVSSC Ground Ground pin for VIDEO DAC circuitry YUV1/C Output Video data output bit 1 / 4MA, SR Analog chroma output DACVDDB Power 3.3V power pin for VIDEO DAC circuitry YUV2/Y Output Video data output bit 2 /...

  • Page 11: Audio Output

    ADIN Analog Input General A/D input RFSUBI Analog Input RF subtraction signal input terminal TEZISLV Analog Input Tracking error zero crossing low pass input Analog Input Tracking error input Analog Input Central servo input Analog Input Focus error input RFLEVEL Analog Input Sub beam add input or RFRP low pass input RFRP DC...

  • Page 12: Video Interface

    LSB first) is possible using the MT1379 internal configuration registers. The I2S format uses four stereo data lines and three clock lines. The PS data and clock lines can be connected directly to one or more audio DAC to generate analog audio output. The two-channel DAC is a CS4392, The DACs support up to 192kHz sampling rate.

  • Page 13: Flash Memory

    FLASH MEMORY The decoder board supports 70ns Flash memories. Currently 4 configurations are supported: •FLASH_512K_8b •FLASH_1024K_8b •FLASH_512Kx2_8b •FLASH_512Kx2_16b The MT1379 permits both 3- and 16-bit common memory I/O accesses with a removable storage card via the host interface. 7 SERIAL EEPROM MEMORY An I2G serial EEPROM is used to store user configuration (i,e, language preferences, speaker setup, etc.) and software configuration.
  • Page 14 9 FRONT PANEL 9.1 VFD CONTROLLER The VFD controller is a NEC uPD 16311. This controller is not a processor, but does include a simple state machine which scans the VFD and reads the front panel button matrix. The 16311 also includes RAM so it can store the current state of all the VFD icons and segments.
  • Page 15 Scart Signals: • Audio signals 0.5V RMS, <1K output impedance, >10K input impedance. • Red, Green, Blue O.7 Vpp ±2dB, 75R input and output impedance. Note that the Red connection (pin20) can alternatively carry the S-Video Chrominance signal, which is 0.3V. •...

  • Page 16: Front Panel

    •IC800 (MC44608) is a SMPS IC. The switching frequency of this IC is constant. Only the duty cycle determines the voltage on the secondary side of the transformer and the duty cycle depends on the feedback current injected into pin 3 (from the secondary side of the SMPS via the opto-coupler IC803) •...
  • Page 17 • 1 laser digital audio output • Also there are antenna inputs for AM/FM tuner, antenna in and tv out for dvb-t receiver. •TOTX176 is used for laser output. •For coaxial audio output SPDIF is used. •SCART pin 8 controls 16:9 and 4:3 mode using Q617 and Q619. •When the pin 8 output of the scart becomes 12 Volts, 4:3 mode is selected and 16:9 mode is selected when this output becomes 5.
  • Page 18 11.4.2 DVB-T Part The IF output of the tuner (TU401) is converted to Transport Stream signals (multiplexed video, audio and data information) after some filtering, and COFDM (coded orthogonal demodulation). The digital demodulator (IC401) output is transported to the STI5518 MPEG–2 decoder (IC100) with cm_clk (clock signal to decoder), cm_valid (indicates valid data bits of transport stream (TS) and cm_sync (indicates start of a TS).
  • Page 19 SOFTWARE 1. AV RECEIVER UNIVERSAL SERVICE PASSWORD Universal Password for Parental level is 1369 VERSION PAGE (Hidden Menu) To see Version Page: • Press DISPLAY button from remote for Setup Menu • Press "1"- "3 "- "5 "- "7 " at Setup Menu •...

  • Page 20: Region Management

    1.3 VFD Full Segment Test Mode During Pressing STOP button on Front Panel if you press Standby button all segments of VFD are highlighted. 1.4 REGION MANAGEMENT At Version page by using arrow keys Region can be changed. 1.5 UPDATE FILE NAME Proper Update file name can be learned from Version Page as follows: First Characters of DAC, LOADER, TUNER and LANGUAGE group gives proper update file name.
  • Page 21 There should be no Volume label. It may be better to put some dummy files in Cd with update file.

  • Page 22: First Time Installation

    2. DVB FIRST TIME INSTALLATION In Installation menu first time installation sub-menu exists. If you choose YES by pressing SELECT button on the remote control, EEPROM and database is erased. SOFTWARE DOWNLOAD FROM COM PORT RS232 TEST The list of the necessary equipment is as follows: PC with “Hyper Terminal”...
  • Page 23 If your system passes this test, you can start software download. Steps to be followed by the user are given below: 1. Connect the serial communication cable between the RS232 outport of the receiver and the serial communication port (COM1 or COM2) of the PC. 2.
  • Page 24 Then activate the STB and do “first time installation” for the new software to run properly. Then you can tune to a channel and test that the new software is functioning properly. RECEIVER UPGRADE OVER THE AIR The STB can be upgraded via the configuration menu, entered from the main menu. In the configuration menu, there is the “Receiver Upgrade”...
  • Page 25 existence of a new software every time the STB goes to standby. The second one is waking up at 04:00 a.m. every night, provided that the STB is left in standby mode. Both automatic upgrade methods result in standby mode either upgraded or not. If the automatic upgrade is set to ‘Disable’...
  • Page 26 Upgrade?’ If there is no new software, pressing SELECT button returns the STB to the configuration menu. If there is a new software, pressing “Yes” will cause upgrading to be started. By, pressing “No” user can return to the configuration menu. Loading will be displayed on the screen by a message and a progress bar, together with a percentage button will indicate the status.
  • Page 27 If the upgrade is cancelled or any error is occurred during the loading process, a warning message is displayed and user is asked to press the SELECT button for returning the last watched channel. After loading the software into memory (SDRAM), it will be written permanent memory (flash).If the STB power is down while new software is being written into the flash memory then new software will not run and old software will be cleaned also.
  • Page 28 while the led is green during start up and pressing O-L-F buttons consecutively. For the back up software to run properly do First Time Installation. If there is no problem during software download through the air process then the above message indicating a successful upgrade will be shown and the STB should go into standby mode in order the changes to take place.
  • Page 29 THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA...
  • Page 48 Fax: +46 (0) 8 562 711 13 Tel: +39 02 38073415 Servizio Clienti Email: csgswe@hitachi-eu.com Fax: +39 02 48786381/2 Email: customerservice.italy@hitachi-eu.com HITACHI EUROPE S.A.S HITACHI EUROPE LTD (Norway) AB Lyon Office STRANDVEIEN 18 B.P. 45, 69671 BRON CEDEX 1366 Lysaker FRANCE...

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