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SERVICE MANUAL
CONTENTS
SAFETY PRECAUTIONS .............................................
.3
SERVICING PRECAUTIONS ........................................... .6
TECHNICAL CAUTIONS .............................................. 10
SPECIFICATIONS ................................................... 11
CIRCUIT PROTECTION .............................................. 11
GENERAL INFORMATION ............................................ 12
CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS .............
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SAFETY NOTICE USE ISOLATION TRANSFORMER WHEN SERVICING Components having special safety characteristics are identified by anon the schematics and on the parts list in this service manual and its supplements and bulletins. Before servicing this chassis, it is important that the service technician read and follow the “Safety Precautions” and the “Product Safety Notices” in this Service Manual. For continued X-Radiation protection, replace picture tube with original type or Hitachi approved eq
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SAFETY PRECAUTIONS Before returning an instrument to the customer, always make a safety check of the entire instrument, including but not limited to the following items. (READING a. Be sure that no built-in protective devices are LEAKAGE SHOULD NOT defective and/or have been deleted during servicing. CURRENT BE ABOVE 0.5mA) (1) Protective shields are provided on this chassis to TESTER DEVICE protect both the technician and the customer. Correctly replace all missing protective shield
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- TUBE: The primary source of X- h. X-radiation Shield - X-radiation radiation in this receiver is the picture tube. The tube 1. This receiver is provided with X-ray shield plates for protection against X-radiation. Do not remove utilized for the above mentioned function in this chassis is specially constructed to limit X-radiation X-ray shield plates A, B, C, or D shown in Fig. 1 emissions. unnecessarily, when troubleshooting and/or making test measurements. For continued X-radiation pr
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2. Read and comply with all caution and safety-related Components, parts, and/or wiring that appear to have overheated or are otherwise damaged should be notes on or inside the receiver cabinet, on the receiver chassis, or on the picture tube. replaced with components, parts, or wiring that meet original specifications. Additionally, determine the cause of overheating and/or damage and, if Design Alteration Warning - Do not alter or add to necessary, take corrective action to remove any 3
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SERVICING PRECAUTIONS CAUTION: Before servicing instruments covered by this 7. Do not apply AC power to this instrument and/or any of its service data and its supplements and addenda, read and electrical assemblies unless all solid-state device heat- follow the SAFETY PRECAUTIONS on page 3 of this sinks are correctly installed. publication. NOTE: If unforeseen circumstances create conflict between 8. Always connect the test instrument ground lead to the the following servicing precautions
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General Soldering Guidelines 2. Draw away the melted solder with an anti-static suction- 1. Use a grounded-tip, low-wattage soldering iron and type solder removal device (or with solder braid) before appropriate tip size and shape that will maintain tip removing the IC. temperature within the range 500°F to 600°F. Replacement 2. Use an appropriate gauge of resin-core solder composed 1. Carefully insert the replacement IC in the circuit board. of 60 parts tin/40 parts lead. 2. Carefully be
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At Other Connections Fuses and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of circuit board Use the following technique to repair defective copper pattern at connections other than IC Pins. This technique hollow stake. involves the installation of a jumper wire on the component side of the circuit board. 2. Securely crimp leads of replacement component around stake l/8 inch from top. 3. Solder the connections. CAUTION: Maintain original spacing b
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NOTE: These components are affixed with glue. Be careful not to break or damage any foil under the component or at the pins of the ICs when removing. Usually applying heat to the component for a short time while twisting with tweezers will break the component loose. How to Replace Flat-IC Leadless Chip Components -Required Tools- (surface mount) Chip components must be replaced with identical * Soldering iron l iron wire or small awl chips due to critical foil track spacing. There are no
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TECHNICAL CAUTIONS High Voltage limiter circuit operation check. 4. When the limiter circuit is operating properly, High 1. Turn off TV and connect jig as shown in Figure 2. Adjust Voltage will be less than 36.5 kV at 0.6mA when TV shuts jig fully counter-clockwise for minimum resistance. down. 2. Set the AC input to 12OV AC and turn on TV. 5. Turn off set immediately after checking circuit operation. 3. Confirm test pattern on CRT is a usable picture, then 6. Unplug set for one minute to
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SPECIFICATIONS 50SBX78B Audio Input: Model: 470 mVrms, 47 k Ohm 6OSBX78B Stereo Audio Output: 470 mVrms, 1 k Ohm Cathode-Ray Tube: R=Pi GLFTOORFA Audio Output Power: G=PlGLFTOOHLA Front: 15 Watts per channel at 10% distortion, 8 Ohm impedence. B=Pi GLFTOOBMB Max. output - 18 Watts. Rear: 7.5 Watts per channel at 10% distortion, 8 Ohm impedence. 120 volts AC, 60 Hz Max output - 10 Watts. Power Input: Center: 7.5 Watts per channel at 10% distortion, 8 Ohm impedence. Power Consumption
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GENERAL INFORMATION TV/Video TV/Video Source Source Selector Selector a&c Focus Fig. 3. Control Panel Rear Speaker _ S-Video Terminals-, Inputs Antenna Variable Transmitter Inputs Inputs/Outputs 1 and 2 Audio Output output Fig. 4. Rear Connections Panel 12
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CUSTOMIZED PICTURE AND SOUND ADJUSTMENTS Select VIDEO to adjust picture settings and improve picture quality. CURSOR CURSOR CONTRAST 4-I, 75% CONTRAST 4-b 98% BRIGHTNESS 4-I) 50% BRIGHTNESS 4-I) 50% COLOR 4I1,50% COLOR 4-I) 50% TINT TINT 4---I 4---I SHARPNESS 4-I, 50% SHARPNESS 4-I, 50% RESET RESET Cl 0 ADVANCED ADVANCED SETTINGS MENU IT0 MENU BAR TO QUIT 1 EXIT I”““““’ Use the CURSOR A or v buttons to highlight the function to be adjusted. Press the CURSOR 4 or b buttons to adju
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Select AUDIO SETTINGS to adjust the TV to your preference and to improve the sound quality. I I I CURSOR BASS BASS 4”,72% 4”,90% TREBLE TREBLE 4-I) 50% I 4-I, xw” BALANCE BALANCE 4-b--‘- 4---I RESET RESET 0 0 ADVANCED ADVANCED I I SETTINGS Ill MENU IT0 MENU BAR TO QUIT 1 EXIT Use CURSOR A or v to highlight the function to be adjusted. Press CURSOR 4 or b to adjust the function. Press EXIT to quit menu. NOTE: If BASS is selected you are adjusting BASS. The additional menu ite
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TV GUIDE PLUS+ This feature allows you to view program information for up to 1 week in the future. It also allows you to control your cable box and VCR with your TV. jSetUD1 TV GUIDE Plus+ Options Menu MENU LANGUAGE CURSOR PLUG & PLAY What would you like to do? SIGNAL SOURCE CURSOR I./ Setup TV GUIDE Plus+ AUTO CHANNEL SET TV GUIDE Plus+ Channel Edito! CHANNEL MEMORY View TV GUIDE Plus+ Demo - CHANNEL LIST Exit CLOCK SET MAGIC FOCUS GUIDE PLUS+ + Press up/down to choose. T
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SET UP TV GUIDE Plus+ Before you can use TV GUIDE Plus+ you must perform the setup. Simply use your illuminated remote control to enter the information provided here. Screens very similar to those you will see as you perform each step are shown here. I STEP 1 TV GUIDE Plus+ Options Menu 1. From the Hitachi on screen display menu, enter the SETUP-GUIDE Plus+ menu. What would you like to do? I./ Setup TV GUIDE Plus+ 2. Use the CURSOR buttons to select Setup TV GUIDE TV GUIDE Plus+ Cha
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SET UP TV GUIDE Plus+ STEP 4 1. Use the CURSOR button to select YES or NO, then press SELECT. Do you have cable? jJ Yes I 2. If you select YES, you will go to step 5. If you select NO, you will go to NO step 9. Press “pidown lo choose. Then. press Select. STEP 5 TV GUIDE Plus+ Setup 1. Use the CURSOR buttons to SELECT YES or NO, then press SELECT. 2. If you select YES, you will go to step 6. If you select NO, you will go to Do you have a cable box? step 9. IJ Yes NO NOTES: A.
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SET UP TV GUIDE Plus+ TV GUIDE Plus+ Setup STEP 6 1. Turn your cable box ON and tune it to channel 02. Tune your cable box to channel 02. Select your cable box brand from the list below. I Hitachi I 2. Use the CURSOR buttons to select your cable box brand from the list, then press SELECT. (It will take a few seconds for TV GUIDE Plus+ to check the cable box code.) press “Pldmv” to change brand. The”. pr**s Select. NOTE: When using a cable box with TV Guide Plus+, set your remote to T
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SET UP TV GUIDE Plus+ TV GUIDE Plus+ Setup STEP 8 1. Using the CURSOR buttons, select the channel number to which Select cable box mtput channel: your cable box Output is set. It is usually set to Channel 3 or O/AUX Channel 4. 4 2. Then press the SELECT button on your remote. Press up/down to choose. Then. press Select. I STEP 9 TV GUIDE Plus+ Setup 1. Use the CURSOR buttons to select YES or NO, then press SELECT. Do you have a VCR 2. If you select YES, you will go to step IO. I
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SET UP TV GUIDE Plus+ -“’ i - - : :$j,i :,I ; , : LA!9 Set U 0 STEP 10 TV GUIDE Plus+ Setup 1. Tune your VCR to channel 02, then turn if OFF. Tune your VCR to channel 02. then turn it off. Select your brand from the list below. 2. Use the CURSOR buttons to select your VCR brand from the Hitachi I I list, then press SELECT. (It will take a few seconds for TV GUIDE Pius+ to check the VCR code.) Basic connection for TV GUIDE Plus+ setup with cable box and VCR. f-Cable TV Coaxial Ca
