Sony KV-VF21M40 SECTION 3 CIRCUIT ADJUSTMENTS

– 98 –

SECTION 3CIRCUIT ADJUSTMENTS

Necessary items and indications for total adjustment of electric

circuit of this unit will be described in this chapter.

[ INSTRUMENTS TO BE USED ]

1) Color TV

2) Signal or dual trace type oscilloscope, band more than 30 MHz,

delay, as provided.

3) Frequency counter (4 digits or more)

4) PAL pattern generater

5) Digital voltmeter

6) Audio level meter

7) Audio generator

8) Attenuator

9) Distortion meter

10)Alignment tape

Part code : H7099052H (MH-2)

[ CONNECTION ]

Unless otherwise specified, connect and adjust the measurement

equipment as follows.

[ SPECIFIED INPUT/OUTPUT LEVEL IMPEDANCE ]

Input/Output terminal

Video input Pin jack

Input signal :1Vp-p, 75 Ω, unbalanced

Sync negative

AUDIO LINE IN Pin jack

Input level : -7.5dBs

(0dBs=0.775Vrms)

Input impedance : More than 47kΩ

[ SET-UP FOR ADJUSTMENT ]

The video signal from the pattern generator is used as adjustment

signal for electrical adjustment. This video signal should meet the

requirement. Connect the oscilloscpe to the video input terminal

on the MF 1 board and make sure that the amplitudes of sync signal

of video signal, video portion and burst signal are flat at

approximately 0.3, 0.7 and 0.3 V, respectively, and that the level

ratio of the burst signal and “red siganl” are 0.30 : 0.66, Fig.3-2

shows video signals (color bars) used in adjusting the electrical

adjustment.

Pattern generator

VIDEO LINE OUT (75Ω)VIDEO INPUT

Fig.3-1

Fig.3-2

Alignment Tape (MH-2)

Time Video signal Audio signal

1 10 minutes Starir-step 6kHz

2 5 minutes - 3kHz

3 10 minutes Color bar 1kHz

4 3 minutes RF sweep -

Approx.

0.7V

Burst signal

(To be flat)

White (approx. 100%)

Horizontal sync signal

Red

Approx.

0.3V

Approx.

0.3V

Contents

Main SERVICE MANUAL CHASSIS (VF21M77 ONLY) COLOR VIDEO TV TRINITRON SPECIFICATIONS Receivable channels and channel display Page 1. OUTLINE 2. DIAGNOSTIC TEST INDICATORS SELF DIAGNOSTIC FUNCTION 4. SELF-DIAGNOSTIC SCREEN DISPLAY 5. HANDLING OF SELF-DIAGNOSTIC SCREEN DISPLAY 3. DISPLAY OF STANDBY LIGHT FLASH COUNT 6. SELF-DIAGNOSTIC CIRCUIT [+Bovercurrent] standard pulse which detect cathode current, or which become low almost. become LOW and OFF RY601. [+Bovervoltage] Step 1: Preparation Check the supplied accessories Insert the batteries into the remote control Step 2: Installing the video TV Secure the video TV Step 3: Connecting the antenna 7 Connecting an outdoor antenna To connect a VHF antenna or a combination VHF/UHF antenna75-ohm coaxial cable (round) To connect both VHF and UHF antennas Step 5: Setting the clock You need to set the clock to use timer recording, Quick-Timer recording and on-timer functions. CLOCK SET , then press Press ENTER. The day section turns red. Press M or m to set the day, then press ,. The month section turns Step 6: Setting the channels Presetting channels automatically Make sure TV SET UP is selected, then press 12 Step 6: Setting the channels (continued) Presetting channels automatically using the TUNER PRESET ON/OFF button on the video TV t 14 Basic Operations 15 Watching the TV Selecting the picture mode Displaying on-screen information Basic Operations 16 Playing a tape 17 Press PLAY N. Playback starts. On-screen information is displayed for a few seconds. Protecting your cassette against accidental erasure 18 Recording TV programs Recording TV programs 20 To stop recording 21 To pause recording Recording with the TV off Recording using QUICK-TIMER 23 Before you begin 24 25 Changing or canceling the Quick Timer settings Press QUICK TIMER. The QUICK TIMER display appears. 26 Recording TV programs using the timer 27 Setting the timer If you have made a mistake during timer setting Daily/weekly recording Adjusting the TV Adjusting the volume INTELLIGENT VOL Additional Operations Presetting channels manually Skipping program positions Adjusting the TV system Adjusting the color system Changing the PICTURE MODE setting 36 Adjusting the alignment of the picture 37 Tape options Adjusting the tracking Adjusting the tracking automatically Adjusting the tracking manually 38 Adjusting with Adaptive Picture Control (APC) 39 To change the setting Playing a tape repeatedly Adjusting the picture for rental tapes When connecting to a Sony VCR 42 Setting the color system 43 Switching off SLEEP To cancel the timer 44 Switching on 45 ON TIMER To cancel the on-timer function 46 Searching using the index function To connect a VCR 47 To stop searching Connecting optional equipment 48 Connecting optional equipment (continued) To watch the video input signal t 2/GAME IN 9 GAME GAME Self-diagnosis function Check that the 1 indicator flashes red once or more in intervals of 3 seconds. Count the number of times the indicator flashes. Press ?/1 to turn off your video TV. t Identifying parts and controls Refer to the pages indicated in parentheses ( ) for details. Front panel 14 2 3 5 6 56 Identifying parts and controls (continued) 57 Remote control 1-2. KV-VF21M77 Step 1: Preparation Check the supplied accessories B A Insert the batteries into the remote control Step 3: Connecting the antenna 7 Connecting an outdoor antenna To connect a VHF antenna or a combination VHF/UHF antenna75-ohm coaxial cable (round) To connect both VHF and UHF antennas Step 5: Setting the clock You need to set the clock to use timer recording, Quick-Timer recording and on-timer functions. CLOCK SET , then press Press ENTER. The day section turns red. Press M or m to set the day, then press ,. The month section turns Step 6: Setting the channels Presetting channels automatically Make sure TV SET UP is selected, then press 12 Step 6: Setting the channels (continued) Presetting channels automatically using the TUNER PRESET ON/OFF button on the video TV t 14 Basic Operations 15 Watching the TV Selecting the picture mode Displaying on-screen information Basic Operations 16 Playing a tape 17 Press PLAY N. Playback starts. On-screen information is displayed for a few seconds. Protecting your cassette against accidental erasure 18 Recording TV programs Recording TV programs 20 To stop recording 21 To pause recording Recording with the TV off Recording using QUICK-TIMER 23 Before you begin 24 25 Changing or canceling the Quick Timer settings Press QUICK TIMER. The QUICK TIMER display appears. 26 Recording TV programs using the G-CODE 27 Setting up the G-CODE system 28 Recording TV programs using the G-CODE system 29 If you make a mistake entering the G-CODE number To use the video TV before timer recording starts Recording TV programs using the timer 31 Setting the timer If you have made a mistake during timer setting Daily/weekly recording Adjusting the TV Adjusting the volume INTELLIGENT VOL Additional Operations Presetting channels manually Skipping program positions Adjusting the TV system Adjusting the color system Changing the PICTURE MODE setting 40 Adjusting the alignment of the picture 41 Tape options Adjusting the tracking Adjusting the tracking automatically Adjusting the tracking manually 42 Adjusting with Adaptive Picture Control (APC) 43 To change the setting Playing a tape repeatedly Adjusting the picture for rental tapes When connecting to a Sony VCR 46 Setting the color system 47 Selecting a bilingual program 48 Switching off 49 SLEEP To cancel the timer Switching on Searching using the index function To stop searching 52 Connecting optional equipment 53 To connect a VCR Watching and recording the picture input from optional equipment To connect a video camera Self-diagnosis function Troubleshooting 58 Symptoms caused by contaminated video heads 59 Normal picture Rough picture Unclear picture No picture (or black & white screen appears) t Identifying parts and controls Front panel 14 2 3 5 6 62 Identifying parts and controls (continued) Remote control SECTION 2 DISASSEMBLY 2-1. REAR COVER REMOVAL 2-2. CHASSIS ASSY REMOVAL Claw 2 Claw 3 A board CV board VM coil F board Tuner FBT Removal of anode-cap removing procedures 2-6. PICTURE TUBE REMOVAL how to handle an anode-cap SECTION 3 SET-UP ADJUSTMENTS 3-1. BEAM LANDING 3-2. CONVERGENCE 3-3. FOCUS ADJUSTMENT 3-4. SCREEN (G2) ADJUSTMENT 3-6. PICTURE DISTORTION ADJUSTMENT 3-5. WHITE BALANCE ADJUSTMENT CONFIRMATION OF HOLD-DOWN 1. CONFIRMATION OF +B LINE (A BOARD) 2. CONFIRMATION OF HOLD-DOWN (A BOARD) SECTION 4 SAFETY RELATED ADJUSTMENT 3. CONFIRMATION AFTER EXCHANGED IC607 AND R638 4. CONFIRMATION AFTER EXCHANGED PM601, R614 AND C614 - A BOARD COMPONENT SIDE SECTION 5 CIRCUIT ADJUSTMENT 5-1. ADJUSTMENTS WITH COMMANDER SERVICE MODE DISPLAY No. DATA RM-956 5-2. ADJUSTMENT METHOD RM-955 REMOTE COMMANDER'S FUNCTION IN SERVICE MODE 5-3. SERVICE DATA Page 5-4. A BOARD ADJUSTMENT Page 79 80 81 82 SECTION 6 DIAGRAMS @ 1 TV BLOCK 1 A A(1/2) (RGB OUT, VM) A A BOARD IC TRANSISTOR * A TUNER,Y/C/J,HV DEFLECTION, POWER SUPPLY CN703 TO PICTURE TUBE TO F BOARD CN902 VIDEO section CV BOARD F BOARD 24.0Vp-p (H) 1.4Vp-p (5msec) F 95 96 SECTION 1 GENERAL - Bottom Side - 1-1. INTERNAL VIEWS - Top Side - 97 SECTION 2 DISASSEMBLY 2-5. SERVICE POSITION (MA10 BOARD) 2-1. TOP COVER REMOVAL 2-2. VCR BLOCK ASSY REMOVAL 2 Top cover 1 Four screws (+BVTP 3 X 12) SECTION 3 CIRCUIT ADJUSTMENTS [ INSTRUMENTS TO BE USED ] [ CONNECTION ] [ SPECIFIED INPUT/OUTPUT LEVEL IMPEDANCE ] [ SET-UP FOR ADJUSTMENT ] 99 Xtal OSC CHECK SYNC AGC CHECK CARRIER DEVIATION CHECK WHITE/DARK CLIP CHECK 100 REC Y LEVEL CHECK REC CHROMA CHECK PB Y LEVEL CHECK SWITCHING LOCATION ADJUSTMENT WHEN CHANGE DRUM SECTION 4 INTERFACE, IC PIN FUNCTION DESCRIPTION 4-1. -COM PORT FUNCTION DESCRIPTION (MA10 BOARD IC001) 102 4-2. SYSTEM CONTROL-VIDEO BLOCK INTERFACE (MA10 BOARD IC402) 4-3. SYSTEM CONTROL-SERVO PERIPHERAL CIRCUIT INTERFACE (MA10 BOARD IC402) 103 4-4. SYSTEM CONTROL-MECHANISM BLOCK INTERFACE (MA10 BOARD IC402) *1. 30Hz 50% duty pulse approximately 5 msec. delayed from RF SW P. 4-5. SYSTEM CONTROL-SYSTEM CONTROL PERIPHERAL CIRCUIT INTERFACE (MA10 BOARD IC402) 4-6. SYSTEM CONTROL-AUDIO BLOCK INTERFACE (MA10 BOARD IC402) 104 4-7. SERVO/SYSTEM CONTROL PORT FUNCTION DESCRIPTION (MA10 BOARD IC402) 105 106 107 SECTION 5 DIAGRAMS CV VIDEO BLOCK 5-1. BLOCK DIAGRAMS FF10 SYSTEM CONTROL,MAIN MICON, VCR SERVO,AUDIO OUT,Y/C PROCESS, AUDIO PROCESS,VIDEOAFM REC/PB AMP @,,@ MA10 (3/3) f E Terminal name of semiconductors in silk screen printed circuit ( ) * MA10 CLK CS SECAM VM SW TV Y MA10 1 2 3 4 5 6 7 8 9 101112131415161718192021 1 2 3 4 5 6 10 12 13 14 15 MA10 SP CH2 F Q701 SW5V 123456789101112 FF10 (LED,EJECT SW) A B C D 12345 123 Page Page Page Page Page 129 SECTION 7 ELECTRICAL PARTS LIST F A TV BLOCK 130 131 132 ACV 133 CV 134 VIDEO BLOCK FF10 MA10 135 136 137 138 139 140 KV-VF21M40/VF21M70/VF21M77 9-965-739-01 Quality Assurance Division Sony Ichinomiya Corporation