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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.
TECHNICAL SPECIFICATIONS
TV Standard ....................................... 625 lines,
STANDARD I (UK)
B/G/H/DK, L/L', (Export)
Channel coverage..............UHF Channels (UK)
UHF/VHF Hyper band (Export)
Aerial input impedance .......................... 75ohm
Power Consumption ..................... Picture Tube
14" Models < 40W
20" Models < 48W
21" Models < 52W
Consumption in standby mode................. <4W
Mains Voltage ........................220V/210V, 50Hz
Fuse..........................................2 Amp time-lag
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
SPÉCIFICATIONS TECHNIQUES
Standard TV .....................................625 lignes,
Couverture de canaux......... Canaux UHF (R-U)
Impédance d'entrée d'antenne............ 75 ohms
Unbalanced
Consommation électrique.......... Tubes-images
35.5cm types
14" Models < 40W
48cm types
20" Models < 48W
51cm types
21" Models < 52W
Consommation en mode veille ................. <4W
Tention secteur ......................220V/240V, 50Hz
Fusible ......................................2 Amp time-lag
December 1998
STANDARD: R-U
B/G/H/DK, L/L': (Export)
UHF/VHF Band hyper (Export)
Non équilibrée
35.5cm types
48cm types
51cm types
No. 0102
Model
C1422R
C1422T
C2122T
CP1422R
CP2122R
CP1422T
CP2022T
CP2122T
CP1422T-481
CP2122T-481
CP1422T-491
CP2022T-491
CP2122T-491
CS1422R
CS2022R
CS2122R
CL1422R
CL2122R
Data contained within this Service
manual is subject to alteration for
improvement.
Les données fournies dans le
présent
manuel
peuvent
faire
l'objet
modifications
en
perfectionner le produit.
Die in diesem Wartungshandbuch
enthaltenen
Spezifikationen
können
sich
Verbesserungen ändern.
SPECIFICATIONS TECHNIQUES
Fernsehnorm....................................625 Zeilen,
Fernsehnorm I (nur GB)
Fernsehnorm B/G/H/DK, L/L' (Export)
Kanäle.................................. UHF-Bereich (GB)
UHF/VHF/Hyperband Bereich
Antenneneingangsimpedanz .............. 75 ohms
Leistungsaufnahme ............................Bildröhre
14" Models < 40W
20" Models < 48W
21" Models < 52W
Leistungsaufnahme im standby mode......<4W
Netzspannung .........................220/240V, 50Hz
Sicherung..................................2 Amp time-lag
Chassis
F1R
F1Y
F4Y
F1GR
F4GR
F1GY
F2GY
F4GY
F1HY
F4HY
F1HY
F2HY
F4HY
F1KR
F2KR
F4KR
F1FR
F4FR
d'entretien
de
vue
de
zwecks
Unsymmetrisch
35.5cm types
48cm types
51cm types
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Table of Contents
Related Manuals for Hitachi C1422R
Summary of Contents for Hitachi C1422R
- Page 1 No. 0102 Model Chassis C1422R C1422T C2122T CP1422R F1GR SERVICE MANUAL CP2122R F4GR MANUEL D’ENTRETIEN CP1422T F1GY CP2022T F2GY WARTUNGSHANDBUCH CP2122T F4GY CP1422T-481 F1HY CP2122T-481 F4HY CAUTION: CP1422T-491 F1HY Before servicing this chassis, it is important that the service technician read...
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Page 3: Safety Precautions
ALL PRODUCTS CE MARK Before any service is performed on the chassis an 1. HITACHI products may contain the CE mark on isolation transformer should be inserted between the the rating plate indicating that the product power line and the product. -
Page 4: Safety And Isolation
SAFETY AND ISOLATION Under no circumstances should any form of repair or maintenance be attempted by any person other than a competent technician or engineer. The following precautions should be observed: For purposes of servicing, the chassis should be supplied from an isolation transformer of at least 150W rating. If disturbed, the original lead dressing should be restored. -
Page 5: Microprocessor Control System
ERVICING Microprocessor Control System Microcontroller Micro-controller, I701, is either a SAA5288 (on non-teletext sets) or a SAA5290 (on teletext sets). Both devices have integrated on-screen display (OSD) generator; the SAA5290 also has an integrated teletext decoder. The micro-controller has a single 12MHz crystal X701. The television is controlled by serial (I²C) bus communication, digital switching inputs and outputs, analogue- to-digital inputs and pulse-width-modulation (PWM) outputs. -
Page 6: Service Parameters
Fault Condition No. of Flashes Multiple TDA884X I²C errors Over voltage / X-ray protection (OVP) 2 Line start-up sequence failed Black current (BC) loop unstable Vertical scan failure Continuous TDA884X power-on reset 6 Multiple error codes may appear, eg. two quick flashes, pause, four quick flashes etc. for OVP + BC loop errors. - Page 7 Value Function Action 14" 20" 21" Vertical shift Adjust to centre picture vertically White point - Red See "Adjustments" in Servicing White point - Green White point - Blue Peaking (sharpness) Use picture menu control instead Brightness Use picture menu control instead Saturation Use picture menu control instead Contrast...
- Page 8 Adjustments H. T. Setting The HT should be adjusted using R818 to obtain correct width with normal brightness and contrast settings. A Philips complex test pattern is ideal for the operation. A1 Control This should be set using the ‘screen’ control on T401 to achieve 140V black level at the tube base cathodes with the brightness and contrast settings normalized.
- Page 9 hand unit. After repair, vertical protection should always be re-enabled by pressing the number 2 key again and storing it with the TV key. (The value of parameter OA toggles between two values when the number 2 key is pressed, the higher of which indicates that the vertical protection is enabled.). Auto Black Level Disable I501 independently sets the black level of each CRT gun to equalize the cut-off points and therefore provide a true black.
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Page 10: Circuit Description
IRCUIT ESCRIPTION Switched Mode Power Supply Summary The power supply is a self-oscillating discontinuous buck converter (step-down chopper) under peak current control and designed for up to 65W output power at nominally 98V. The main B+ output of this converter topology is inherently non-isolated and as such, output voltage feedback does not require an opto-coupler. -
Page 11: Overvoltage Protection
Overvoltage Protection An unfortunate characteristic of the buck converter is that if the power switch Q801 should become short- circuit, the full rectified mains voltage appears at the output, over stressing components in both the PSU itself and the load. In order to limit the output voltage rise under these conditions, a 130V 5W zener diode D805 is fitted across the B+ output. -
Page 12: Tuner And If Stages
Tuner and IF Stages Tuner The main chassis is fitted with a voltage synthesis UHF tuner for system I. Control of the tuned frequency is achieved by a voltage on pin 2 of the tuner. This voltage is derived from integrating a 33 volt PWM switched waveform. -
Page 13: Source Selection
Source Selection Source selection is controlled by the microcontroller via I²C bus commands. The video processor I501 can select between internal demodulated CVBS video on its pin 13, external CVBS video (AV1) from pin 20 of P501 on its pin 17 or, if available, from external CVBS video (AV2) from the yellow phono socket of PA501, which is applied to pin 11. -
Page 14: Colour Decoder
Colour Decoder The luma signal processing and colour decoding are implemented by I501. The luminance and chrominance signals are separated internally. A delay line is also incorporated to compensate for the difference between the luma and chroma processing times. There are no adjustments required on the colour decoder. On-Screen Display The micro-controller on-screen display (OSD) supplies blanking and RGB signals for overlaying the television picture. -
Page 15: Horizontal And Vertical Deflection
Horizontal and Vertical Deflection In addition to decoding and switching, I501 provides deflection processing for the horizontal and vertical time-base circuits. Using video from the IF or external source as appropriate, the timebase circuit of I501 produces horizontal drive pulses at pin 40 to switch horizontal drive transistor Q402, and a differential vertical ramp at pins 46 and 47 to drive the vertical deflection output amplifier (I401). -
Page 16: Vertical Protection
Vertical Protection When operating normally, the vertical output stage generates a +5.5V pulse during vertical flyback blanking. This pulse is fed via Q407 to I501 beam current input. Should this pulse fail, the picture tube outputs are "blanked off" until after about 12 seconds, the micro controller records a failure. For diagnostic purposes, vertical protection during the 12 second interval may be disabled by pressing the '2' key on the remote control handunit when in service parameter 'OA'. -
Page 17: Tube Base Panel
TUBE BASE PANEL The picture tube amplifiers produce high voltage CRT electrode drives from the low voltage RGB outputs of the TDA884x (I501). They also produce black current information to maintain the grey-scale characteristics which is returned to the colour decoder (I501). Also included is circuitry for picture blanking during switch on. The picture tube aquadag, (P901), is used to provide beam current information for the colour decoder for the purposes of beam current limiting. - Page 18 TDA884X Video Processor Designation Description SNDIF Sound IF AUDIOEXT External Audio Not Connected Not Connected PLLLF IF-PLL loop filter IFVO IF Video Serial Clock Serial data Bandgap de-coupling CHROMA Chrominance CVBS/Y External CVBS/Y Main supply voltage 1 (+8V) CVBS Internal CVBS GND 1 Ground 1 AUDIOOUT...
- Page 19 TDA884X Video Processor CVBS OUT 15 55 Fig 7 Block Diagram...
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Page 20: Remote Control
Remote Control The remote control system used is the Philip’s Enhanced RC5 protocol, with sub-address 00000. Infra-red Transmitter The hand unit is controlled by IC781, type PCA84C122AT/093, surface mounted on the keypad side of the PCB. When replacing the part, the /093 is significant as it determines the key codes transmitted. Two AA type batteries in series provide a 3V power supply. - Page 21 Microprocessor Control System Microcontroller Micro-controller, I701, is either a SAA5288 (on non-teletext sets) or a SAA5290 (on teletext sets). Both devices have integrated on-screen display (OSD) generator; the SAA5290 also has an integrated teletext decoder. The micro-controller has a single 12MHz crystal X701. The television is controlled by serial (I²C) bus communication, digital switching inputs and outputs, analogue- to-digital inputs and pulse-width-modulation (PWM) outputs.
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Page 22: Error Codes
OSD / Teletext Line and field timings are obtained from V.sync on pin 37 and H.sync input on pin 36. Teletext (on teletext sets only) is obtained from the CVBS input on pin 23. The RGB outputs on pins 34, 33 and 32 respectively are inserted into the TV output when gated by the OSD EN OUT signal on pin 35. - Page 23 Service Parameters The following values assume you are watching a tuned in picture, on RF. (On other sources, or with no signal, some values may differ.) Service parameters 00 to 1A apply to the control registers of I501 as shown in the following table. Value Function Action...
- Page 24 Microprocessor Pin-outs Designation Purpose P2.0/TPWM Tuning PWM P2.1/PWM0 Text contrast PWM P2.2/PWM1 AV audio control: high = AV2, low = RGB/AV1 P2.3/PWM2 !FM/AM source select (low = AM) P2.4/PWM3 !SCART/internal sound select (low = internal sound) P2.5/PWM4 !L’ control select (active high) P2.6/PWM5 Pseudo line drive P2.7...
- Page 25 SAA5290 (Teletext) & SAA5288 (Non-teletext) Microcontrollers Note: The SAA5288 microcontroller used on non-teletext models does not perform the functions in the shaded area. Black IRef R,G,B, Teletext CVBS0, Display Data Slicer VDS, Acquisition CVBS1 Page VSync Display Acquisition HSync Timing Timing Frame 256 x 8...
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Page 26: Using The Menus
UIDE Operating Instructions Using the Menus Green Selects the PICTURE controls menu. Yellow Selects the MANUAL/TUNING menu. Blue Key Selects the FEATURES menu. Red Key Used only within the other menus above. The green, yellow and blue keys select the Menus as listed above. See pages 3 and 4 for full details of their functions. - Page 40 Section 15 COMPONENTS LIST 14” Models C1422R C1422T CP1422R CP1422T CP1422T-481 CP1422T-491 CL1422R CS1422R Chassis type F1GR F1GY F1HY F1HY F1FR F1KR 20” Models CP2022T CP2022T-491 CS2022R Chassis type F2GY F2HY F2KR 21” Models C2122T CP2122R CP2122T CP2122T-481 CP2122T-491 CL2122R...
- Page 41 Cct Ref. Tol.% Volts Xpos(track) Xpos(comp) Ypos Type Part No. C516 270p 168.00 46.00 16.50 COH S.M.0805 T5240827191 C517 270p 150.50 63.50 5.25 COH S.M.0805 T5240827191 C518 153.00 61.00 101.20 X7R S.M.0805 T5230847391 C519 270p 144.50 69.50 5.25 COH S.M.0805 T5240827191 C520 148.00...
- Page 42 T5280810491 CA501 270p COH S.M.0805 T5240827191 CA601 X7R S.M.0805 T5230822391 CA602 1000p DC Ceramic T5231310291 15.1.1 Capacitor Differences Table (14” Models) Model C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref C009 T5213410191...
- Page 43 15.1.2 Capacitor Differences Table (20” Models) Model No CP2022T CS2022R CP2022T-491 Chassis F2GY F2KR F2HY Cct Ref C303 T5280810491 T5280810491 C304 T5280810491 T5280810491 C410 T5270208701 T5270208701 T5270208701 C411 T5270356402 T5270356402 T5270356402 C419 T5234256100 T5234256100 T5234256100 C514 T5275122491 C617 T5213647991 T5213647991 T5213647991 C808 T5233247191...
- Page 44 15.1.4 Difference Table Component Values Cct Ref. Tol.% Volts Xpos(track) Xpos(comp) Ypos Type Part No. C009 100µ 192.50 21.50 163.00 Elect 85° C T5213410191 C010 100n 189.50 24.50 163.00 Y5V S.M.0805 T5280810491 C303 100n 181.20 32.80 160.50 Y5V S.M.0805 T5280810491 C304 100n 184.50...
- Page 45 Cct Ref. Tol.% Watts Xpos(track) Xpos(comp) Ypos Type Part No. R319 470R 164.50 49.50 147.50 6mm Linear pot T5162160780 R401 100R 128.00 86.00 88.25 S.M.0805 T5142110195 R402 69.85 144.15 10.00 S.M.0805 T5132310209 R403 66.50 147.50 24.00 Carbon film T5142112395 R405 88.50 125.50 90.50...
- Page 46 Cct Ref. Tol.% Watts Xpos(track) Xpos(comp) Ypos Type Part No. R611 171.00 43.00 119.00 S.M.0805 T5132368209 R612 163.50 50.50 113.50 Carbon film T5142118395 R613 133.50 80.50 5.50 S.M.0805 T5132310209 R614 128.50 85.50 5.50 S.M.0805 T5132310209 R615 131.30 82.70 35.00 S.M.0805 T5132347209 R616 220R...
- Page 47 T5111210290 RA501 Carbon film T5142175095 RA601 S.M.0805 T5132312309 RA602 100R 0.25 Carbon film T5142810195 15.2.1 Resistor Differences Table (14” Models) Model C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref R001 T5132300009 T5132300009...
- Page 48 15.2.2 Resistor Differences Table (20” Models) Models No CP2022T CS2022R CP2022T-491 Chassis F2GY F2KR F2HY Cct Ref R001 T5132300009 T5132300009 T5132300009 R013 T5132322309 T5132322309 T5132322309 R014 T5142122395 T5142122395 T5142122395 R015 T5132322309 T5132322309 T5132322309 R016 T5142122395 T5142122395 T5142122395 R017 T5132322309 T5132322309 T5132322309 R018 T5142122395...
- Page 49 15.2.3 Resistor Differences Table (21” Models) Models No CP2122R CS2122R CL2122R C2122T CP2122T CP2122T-481 CP2122T-491 Chassis F4GR F4KR F4FR F4GY F4HY Cct Ref R001 T5132300009 T5132300009 T5132312309 T5132300009 T5132300009 T5132300009 R013 T5132322309 T5132322309 T5132322309 T5132322309 T5132322309 R014 T5142122395 T5142122395 T5142122395 T5142122395 T5142122395 R015...
- Page 50 15.2.4 Difference Table Component Values Cct Ref. Tol.% Watts Xpos(track) Xpos(comp) Ypos Type Part No. R001 186.00 28.00 13.50 S.M.0805 T5132300009 R001 S.M.0805 T5132312309 R013 206.50 7.50 166.75 S.M.0805 T5132322309 R014 191.25 22.75 172.00 Carbon film T5142122395 R015 202.00 12.00 165.75 S.M.0805 T5132322309...
- Page 51 Infra-red receiver TSOP1736 180.00 34.00 244.75 T6642900100 I801 Voltage regulator 5V o/p MC78L05ACP 93.00 121.00 110.00 T6640000806 15.3.1 Integrated Circuit Differences Table (14” Models) Model C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref I501...
- Page 52 D905 Switching diode 20.25 193.75 221.50 T6613900250 D910 Zener BZV85C5V1 89.00 125.00 194.00 T6615900030 15.4.1 Diodes Differences Table (14” Models) Model No C1422T C1422R CP1422T CP1422R CP1422T-491 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref D001 T6613003032...
- Page 53 Choke 10µH T5064010039 LA602 Coil TRF-3101J 100µH, 5% T5064010129 LA603 Coil TRF-3101J 100µH, 5% T5064010129 15.5.1 Chokes, Coils, Delay Lines And Crystals Differences Table (14” Models) Model No C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR...
- Page 54 Filter EMI transformer type 41.50 172.50 183.50 T5061700200 T802 S.M.P.S.U. 75.00 139.00 137.50 T5061800101 15.6.1 Transformer Differences Table (14” Models) Model No C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref T401 T5062690328...
- Page 55 15.6.2 Transformer Differences Table (20” Models) Model No CP2022T CS2022R CP2022T-491 Chassis F2GY F2KR Cct Ref T401 T5062690228 T5062690228 T5062690228 15.6.3 Transformer Differences Table (21” Models) Model No CP2122R CS2122R CL2122R C2122T CP2122T CP2122T-481 CP2122T-491 Chassis F4GR F4KR F4FR F4GY F4HY Cct Ref T401...
- Page 56 Q909 NPN HF 2SC1815YTPE2 11.75 202.25 200.50 T6621015332 Q910 BC857 S.M. 8.80 205.20 237.40 T6623900000 15.7.1 Transistor Differences Table (14” Models) Model C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref Q002 T6623900000...
- Page 57 232.50 T5056203901 P904 G1 Bias T5649390002 PA501 Jack pin T5056390030 PA601 Phono jack, SCJ-0349A-U T5056390035 15.8.1 Pin and Socket Differences Table (14” Models) Model No C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref...
- Page 58 Core bead BRH 5x4x1.5mm 34.50 179.50 55.50 T5061105400 B402 Core bead BRH 5x4x1.5mm 10.00 204.00 31.50 T5061105400 15.9.1 Ferrite Bead Differences Table Model No C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR F1FR Cct Ref B801 T5061105200 15.9.2...
- Page 59 T5053500110 On/Off Switch 2 pole push-push power T5054524488 Lead Mains switch PCB connect T5057802014 Base and pin 2P T5056490204 15.11.1 Tuner Difference Table (14” Models) Model No C1422T C1422R CP1422T CP1422R CP1422T-481 CS1422R CL1422R CP1422T-491 Chassis F1GY F1GR F1HY F1KR...
- Page 60 T5649490040 Tube mounting washer (toothed) T5649490041 T5649490041 Tube mounting washer T5649490001 Tube mounting washer (toothed) T47-1186-6 Finger nut M5 T5649490042 Badge “ HITACHI” T5649490044 T5649490044 T5649490044 Screw BRB M4, 0x16 S-ZN-CC T7033252252 T7033252252 T7033252252 Nut full STL M5 PLT T7076340012...
- Page 61 !"#$%&'()%* + ,-%))% "# ./ 0 ,1$2 ,, 1.3 . 4( "1 . "5#6 1 '70 ,-%&2(8% 0 9-%&2(%4'2 ,-%8'8()%%% ,-. 1 :, 5"; 5& "5 0 9-%8'8()(%% ,-5" 1& 1:5 ; 5& "5 ! "# 1' 1 < 1,%& (%(4 " ,.1= %'%' 15 , $ ,-%2% ,-%2)(%2%...