Text preview for : LG_KI-14U71_KI-14U71x_KI-20U71_KI-20U72x.pdf part of LG LG_KI-14U71_KI-14U71x_KI-20U71_KI-20U72x Service Manual
Back to : LG_KI-14U71_KI-14U71x_KI- | Home
SERVICE BULLETIN
No. Date KI-14U71 KI-14U71X KI-20U71 KI-20U72X GB000001 EFFECTIVE FROM(SERIAL NO.) From the shipment on June 1998 : VSB-85030 : 08/06/1998
Model
Buyer
EFFECTIVE DATE 31/05/1998 Subject
Improvement of the reliability Before Change After Change Note PART NO. DESC./SPEC.
SHIELD BUTTOM
No. LOC NO. PART NO. 4814V00016B DESC./SPEC.
SHIELD MAIN 1 SBHG-1 . BOTTOM
KRemark CODE 3
1
4814V00016A
B
Reason Of Change Symptom : "HUM" in sound when playing a tape recorded in SET. Countermeasure : Add a silicon shield plate to SHIELD BOTTOM.
** FILE THIS SERVICE BULLETIN WITH YOUR SERVICE MANUAL NOTE(**) : INTERCHANGEABILITY CODE
Parts Original Set Original or new parts may be used in early or Early late production sets. Late Use original parts until exhausted, then stock new parts. Original parts may be used in early production sets only. New parts may be used in early or late production sets. Use original parts where possible, then stock new parts. New parts only may be used in early or late production sets. Stock new parts. 1. To improve performance 2. To improve productivity 3. To improve reliability 4. Change of material or dimension 5. Addtion 6. Deletion 7. Correction
KEY-WORD CODE
A
New
Original
Early Late
B
New
Original
Early Late
C
New
Original
D
New
Original parts only may be used in early Early production sets. New parts may be used in late production sets only. Late Stock original and new parts.
CHIEF ENGINEER , FACTORY.
TROUBLE SHOOTING
NO POWER : NO STAND-BY
Check if the Fuse is O.K.?
NO
Replace the Fuse
YES
Is there voltage at pin 9 of T801?
NO
Check/Replace D801, D802, 803, 804, R801, C807.
YES
Is there about 6.1V at pin 9 of IC801?
NO
Check/Replace D806, Q801, R807, ZD801, C814, IC801.
YES
Is there about 11V at '+' terminal of C856?
NO
¡ Check/Replace FR851, D852, C856, Q860, Q861, Q862, ZD860, ZD861, R874. ¡ Check the pin 11 of P804 : 'LOW"
YES
Is there about 6V at pin 9 of P804?
NO
Check/Replace R863, IC857, D858, R877, C875
YES
Check the 6V Line of MAIN 1 BOARD
1
NO POWER : NO MONITOR ON
Check the NO POWER(NO ST-BY) BLOCK
NO
Go to NO POWER (NO ST-BY) BLOCK
YES
Is there about 6V at pin 9 of P804?
NO
Check the pin 10 of P804 ; "HIGH"
YES
Is there about 115V at '+' terminal of C865?
NO
¡ Check/Replace D851, L851, C860, IC851. ¡ Check the pin 10 of P804 : 'HIGH"
YES Go to NO RASTER BLOCK Check T701, Q781 and go to NO RASTER BLOCK
2
NO RASTER
Is there about 115V at pin 3 of T701?
NO
Go to NO POWER BLOCK
YES
Is there about 8V at pin 6 of P805?
NO
¡ Check/Replace F852, D850, C857, R899, IC853, C863. ¡ Check the 8V LINE of VCD BOARD
YES
Does the square waveform appear at pin 1 of P805?
NO
¡ Check the H-OUT LINE of VCD BOARD. ¡ Check/Replace IC501 of VCD BOARD.
YES
Does the waveform appear at the collector of Q781?
NO
Check/Replace Q782, T781, R783, R787, Q781.
YES
Is there about 6.3VAC at HEATER of CPT SOCKET?
NO
Check/Replace T701, 5PIN CONNECTOR, FR2901, FR2902 (14" : FR1901)
YES
Go to NO PICTURE BLOCK
3
V. Deflection ERROR
Does the V-A, V-B signal appear at pin 4, 7 of P805?
NO
Check the vertical part of VCD BOARD
YES
Is there about 15V at pin 3 of IC701?
NO
Check/Replace FR702, D702, C704, L731
YES
Is there about 44V at pin 6 of IC701?
NO
Check;/Replace FR701, D701, C708, L732, C734.
YES Check/Replace IC701
NO PICTURE
Does the RGB signal appear at pin 3, 5, 7 of P2902? (14" : P1902)
NO
Check the CVBS line of VCD BOARD (Refer to VCD BLOCK DIAGRAM)
YES
Is there about 200V at pin 1 of P2901B? (14" : P1901B)
NO
Check/Replace FR704, D703, C702, T701, 5PIN CONNECTOR, L2901, R2924 (14" : L1901, R1924)
YES ¡ Check/Replace IC2901. (14" : IC1901) ¡ Check screen voltage
4
NO SOUND
Is there about 25V at pin 5 of IC601?
NO
Check/Replace FR854, D855, IC601.
YES
Does the sound signal appear at pin 9 of P805?
NO
Check the Audio source line of VCD BOARD
YES
Does the sound signal appear at pin 4 of IC601?
NO
¡ Check the voltage at collector of Q601. ¡ Check/Replace IC601, external components of IC601.
YES Check/Replace speaker, speaker connector.
5
MECHANISM TROUBLESHOOTING GUIDE
1.Deck Mechanism
A.
Auto REW doesn't work.
YES
Is the output of END senser of supply side "L"? Is the supply end sensor less than 3.5V ("L")
YES
Is the voltage drop across IR LED between 0.8~1.5V?
NO
Check the system (u-com).
NO
YES
Replace LED.
Is LED-Prism OK?
NO
Check the 5VA supply, replace LED Prism.
YES NO
Is the Prism housing damaged?
Replace Prism.
YES
Replace Photo Tr.
NOTES:
1) Auto REW takes place when the supply end sensor is "H" high. 2) "H"=voltage greater than 3.5V, "L"=voltage between 0.7~1.0V.
4-27
MECHANISM TROUBLESHOOTING GUIDE
AUTO STOP.
YES
In auto stop is the pinch roller in contact with the capstan shaft.
NO
Is the output of DFG, DPG OK?
NO
Replace Drum Motor.
YES
Are there T/up and supply reel pulses.
YES NO
Check Servo, Syscon.
YES
Check the Syscon, u-COM. Replace Reel Sensor.
No cassette loading.
YES
Insert the cassette.
YES
Does the cassette door lever S/W work normally.
NO
Check Housing Assembly.
YES
Is the output of F/L S/W "H"?
YES
Is the mode SW in the ULC position. (tape unloaded)
YES
Refer to 1. Mechanism and Mode Switch Alignment check (Page 4-16)
NO
Does Capstan Motor turn?
NO
Check Capstan Motor.
YES
Did the H1 lever change position.
NO
Refer to Page 4-8 item 11.
YES
Check Housing Ass'y.
4-28
MECHANISM TROUBLESHOOTING GUIDE
D.
In PB mode Tape Presence not sensed.
NO
YES
Is the Pinch Roller attached to the Capstan Motor Shaft? Does the Capstan Motor turn?
NO
¨Í
YES
Does the T/Up Reel turn?
YES NO
Does the Drum Motor turn?
NO
¨Î
YES
Check the clutch and the Idler Assembly. Is the Belt OK?
YES NO
Are there DPG, DFG Pulses?
NO
YES
Check T/up Reel and replace. Replace the Belt.
YES
Are the T/Up Supply Reel Sensors OK? Replace Drum Motor.
YES
NO
Replace Reel Sensor.
Check Servo, Syscon.
¨Î
Is the Vcc voltage of the Drum Motor normal?
¨Í
NO
Is the voltage supplied to the Capstan Motor Vcc1, Vcc2 each?
YES NO
Is the terminal voltage of the Drum Motor more than 2V? Check Servo.
YES
Does terminal voltage of Capstan Motor supplied more than 4V?
NO
Check Servo, Power.
YES
Replace the Drum Motor.
YES
Replace the Capstan Motor.
4-29
MECHANISM TROUBLESHOOTING GUIDE
E.
In Eject mode, the Tape will not eject.
YES
Are the T/Up and Supply End Sensors OK?
NO
YES
Replace the F/L S/W. Replace End Sensor.
No F/R modes.
YES
Is the present mode, F/R Mode?
NO
Eject Key-in.
YES
Does the Capstan Motor rotate?
YES NO
Is the mode SW assembled correctly (refer to Pages 4-16.)
YES
Do the T/Up, Supply Reel rotate? Is the normal voltage supplied to the Capstan Motor Vcc1, Vcc2.?
YES
Capstan motor stopped due to jammed mechanism?
YES YES
Check the clutch, Lever Ass'y F/R and Idler Ass'y. Does terminal voltage of Capstan Motor supply side more than 4V?
NO
Check Servo, Power.
NO
Replace Reel Sensor.
YES
Replace the Capstan Motor.
4-30
MECHANISM TROUBLESHOOTING GUIDE
2. Front Loading Mechanism A.
Cassette cannot be inserted.
Does the Lever Switch work?
YES
NO
Is the Cassette Lever/Spring Switch damaged or omitted?
NO
Is 5V applied to the ¥-COM Vcc port.
YES
Replace or add the Lever/Spring Switch.
YES
NO
Check the Power Part.
Is 5V applied to CST switch port of u-COM?
YES
NO
Replace the Cassette Switch.
Check the syscon Part.
4-31
MECHANISM TROUBLESHOOTING GUIDE
B.
Cassette will not load. (Tape does not thread around the drum.)
YES
Does the CST insert?
NO
YES
Does the lid opener work?
Check the Gear H1 position on the Deck.
YES
NO
Replace the lid opener.
Does the Gear Cam F/L work?
YES
NO
Is the (R) side gear train and bracket assembled correctly?
Does the lid opener work?
YES
NO
Is the lid opener assembled correctly.
Does the Arm Assembly F/L work?
YES
NO
Does the Capstan Motor work?
Replace the Arm Assembly F/L.
YES
NO
Check the power of Capstan Motor.
Does the Holder Assembly Cassette move the Arm Assembly F/L?
NO
YES
Check the Holder Assembly Cassette.
Replace the Front Loading Mechanism Assembly.
4-32
MECHANISM TROUBLESHOOTING GUIDE
C.
Cassette will not eject.
Is the Gear H1 position correct on the deck?
YES
NO
Check the Gear H1.
Does the Capstan Motor shaft rotate?
YES
NO
Check the Capstan Motor.
Does the Lever Switch work?
YES
NO
Replace the Lever/Spring Switch.
Does the Gear Cam F/L work?
YES
NO
Check the Gear Train of Bracket Side (R).
Does the Opener Door work?
NO
Replace the Opener Door.
4-33
ADJUSTMENT INSTRUCTIONS
Notes;
(Adjustments must be performed by the following procedures) 1. It is recommended that an isolation transformer be used when servicing this chassis to prevent electric shock and damage to test equipment. 2. The ac line voltage must be maintained at 230 vac, +- 10%, 50/60 hz. 3. Prior to making any adjustments, the receiver must be operated for 10 minutes.
P2
P2 POST ADJUST
P3
P3 POST ADJUST
1. DECK ADJUSTMENT
1. Deck Transit System Adjustment
1-1. Necessary Instruments
1) 2) 3) 4) TAPE for SP (4HD), Normal (2HD) Oscilloscope 10:1 Probes 2EA Adjustment Driver (P2, P3, X-distance (NUT), Audio (NUT) control) 5) RMS Meter (Audio Level Meter)
1-4. X-Distance Adjustment
1) Turn the Cone Screw of the DECK left or right so that the RF waveform is maximum. 2) Check if the RF waveform satisfies the linearity by pressing TRK UP(+) and DOWN(-) button one step. CAUTION: If the RF waveform becomes maximum with the Cone Screw more than 2 turns, its out of adjustment. (2 turns; 720)
1-5. Audio Level Check and Adjustment
1) Connect "+" terminal of RMS Meter (Audio Level Meter) to J233 on MAIN PCB AUDIO OUT and "-" terminal to GND, respectively. 2) Play the 1khz and 7khz segments on the alignment tape and confirm if the spec is meet in item #3. If not adjust the azimuth screw to meet this spec. 3) Audio Level Spec: 1KHz ; 0.5 +_0.1Vrms 6KHz ; 1K +_1.5dB
1-2.Preliminary Steps
1) Connect CH 1 of the oscilloscope to J439 (H/SW) on the main PCB. Trigger on this channel. 2) Connect CH 2 of the oscilloscope to J218 (RF) on the main PCB. Monitor this waveform when preceding with step 4. 3) Play an alignment tape. 4) When the "auto Trk" caption appears on screen, press the TRK up (+) button on the RCU to initialize the manual tracking feature. 5) If manual tracking differs from auto tracking, precede with steps 1-3 (RF Linearity) and 1-4 (X-Distance Adj.).
AZIMUTH SCREW X-DISTANCE CONE POINT ADJUST SCREW SCREW A/C HEAD HEIGHT ADJUST NUT
P2
DRUM
P3
Adjust waveform
FE HEAD A/C HEAD P4 CAPSTAN T/UP ARM
2. CIRCUIT ADJUSTMENT
1. PG Adjustment
P1 ARM TENSION P0
PINCH ROLLER
TAPE
1-1. Necessary Instruments
1) Alignment tape SP 2) Oscilloscope 3) 10 : 1 Probe
SUPPLY REEL
TAKE-UP REEL
1-2.Adjustment
1) PLAY exclusive use of SP tape. (2HD: NORMAL TAPE) 2) Connect CH 1 of the Oscilloscope to J439 (H/SW) on the MAIN PCB and VOL/DIV to 1V Range and Trigger the Oscilloscope. 3) Connect CH 2 of the oscilloscope to J454 (Video Out) on the main PCB and set the VOL/DIV to 500mV Range. 4) Set TIME/DIV of oscilloscope to 50us Range. 5) Adjust VR01 so that V-sync Falling Edge of Video signal become 412usec+_20usec.
1-3. RF linearity check and adjustment
1) Adjust P2 & P3 so that the RF ENVELOPE waveform is maximum and stabilized . 2) Check if the ENVELOPE waveform is at its maximum size by pressing TRK UP(+) and DOWN(-) button one step.
3-5
7. RF AGC Adjustment
1) Input PAL DIGITAL PATTERN. 2) Connect DMM to AGC(J232) test point on the Main PCB. 3) Press SVC Key on the Service Remote Controller to get into SVC mode and press PR +/- Key to select AGC. 4) Press VOL +/- Key until DMM reads the data on the table below.
Adjust Period
MODEL
KL/KB/KI 70dBu 5.5 65dBu 5.6 1dBu 0.1Vdc 1dBu 0.1Vdc
* CAUTION: Set the trigger mode of Oscilloscope to DC.
2 TUNER 1 TUNER
Electric fields strength AGC Voltage Electric fields strength AGC Voltage
2. Normal REC Bias Level Adjustment
2-1. Necessary Instruments
1) Blank tape for Recording 2) RMS Meter
Note : When adjusting 2 TUNER Model, select BOOSTER OFF from MENU.
2-2. Adjustment
1) Set the TV/VCR to A/V input mode. 2) Insert a tape and press REC button. 3) Connect RMS Meter's (+), (-) to R401 on MAIN PCB. 4) Adjust VR401 so that the RMS Meter's indicator become within 2.6mV+_0.05mV.
8. White Balance Adjustment
1) Input a signal which lower half is black and upper half is white. 2) Set the picture at standard on. 3) Press SVC Key on the Service Remote Controller to get into Service mode. 4) Press PR +/- Key to select BG, RG. Press VOL +/- Key until X=281+_3, Y=288+_3.
3. Focus Voltage Adjustment
1) Receive the cross hatch pattern. 2) Press the PICTURE button to set the Standard ON condition. 3) Adjust Focus control knob so that the focus of center & circumference to be best.
* GG is fixed data at 32 so, do not adjust GG data.
9. Deflection Data Adjustment
1) Input PAL Digital Pattern. 2) Press SVC Key on the Service Remote Controller and select LINE SERVICE 2 mode. 3) Press PR +/- Key to select an adjustment mode. 4) Press VOL +/- Key to adjust data. 5) Vertical SLOPE adjustment a) Select V-SLP mode with PR +/- Key. b) Press VOL +/- Key until the horizontal center line of the large circle coincides with Blanking Line. 6) Vertical amplitude adjustment a) Select V-AMP mode with PR +/- Key. b) Press VOL +/- Key until the upper and lower end of the large circle reach 5 mm inside from the effective area of CPT. 7) Vertical Shift Adjustment a) Select V-SFT mode with PR +/- Key. b) Press VOL +/- Key until the horizontal center coincides with the vertical sign slot mark of CPT. 8) Horizontal Shift Adjustment a) Select H-SFT mode with PR +/- Key. b) Press VOL +/- Key until the vertical center coincides with the horizontal sign slot mark of CPT. 9) Vertical S-Correction Adjustment a) Select S-COL mode with PR +/- Key. b) Press VOL +/- Key until the grid of Cross Hatch Pattern is even all over the screen.
4. Screen Adjustment
1) Press TV/AV button and select AV mode. 2) Adjust SCREEN control until the retrace line is visible and return until the retrace line is invisible.
* How to get into SVC mode when you don't have SVC Remote Controller. Push the "OK" Key on the user's Remote Controller and local "OK" button at the same time.
5. VCO Adjustment
1) Select channel 0. 2) Input PAL Digital pattern (175.25MHz). 3) Press SVC Key on the Service Remote Controller to get into SVC mode and press PR +/- Key to select VCO. 4) Press VOL +/- Key until OK is displayed on the screen.
6. LCO Adjustment
1) Select channel 99. 2) Input SECAM-L' pattern (55.75MHz). 3) Press SVC Key on the Service Remote Controller to get into SVC mode and Press PR +/- Key to select LCO. 4) Press VOL +/- Key until OK is displayed on the screen.
3-6
PURITY & CONVERGENCE ADJUSTMENT
Caution:
Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. However, the effects of adjacent receiver components, or replacement of picture tube or deflection yoke may require the need to readjust purity any convergence. 5. Reconnect the internal degaussing coil. 6. Position the beam bender locking rings at the 9 o'clock position and the other three pairs of tabs (2,4 and 6 pole magnets) at the 12 o'clock position.
DEFLECTION YOKE PURITY &CONVERGENCE MAGNET ASSEMBLY
6-POLE 6-POLE MAGNETS
MAGNES PURITY MAGNET(2-POLE)
6-POLE
,, ,, ,, ,, ,, , ,,,, ,,,, ,,,,
, ,,,,
RUBBER WEDGES
* Purity Adjustment
This procedure DOES NOT apply to bonded yoke and picture tube assemblies. The instrument should be at room temperature (60 degrees F or above) for six (6) hours and be operating at low beam current (dark background) for approximately 20 to 30 minutes before performing purity adjustments.
CAUTION: Do not remove any trim magnets that may be attached to the bell of the picture tube.
1. Remove the AC power and disconnect the internal degaussing coil. 2. Remove the yoke from the neck of the picture tube. 3. If the yoke has the tape version beam bender, remove it and replace it with a adjustable type beam bender (follow the instructions provided with the new beam bender) 4. Replace the yoke on the picture tube neck, temporarily remove the three (3) rubber wedges from the bell of the picture tube and then slide the yoke completely forward.
3-2
,, , ,,,, , ,,,, , ,,,, , ,,,, , , ,,,, , ,,,, , ,,,, , ,,,,
, ,,,,
4-POLE X-AXIS YOKE MAGNET POSITIONING (L/R PURITY)
PURITY MAGNET 4-POLE
GLASS CLOTH TAPE
CONVERGENCE MAGNET ASSEMBLY CONVERGENCE MAGNET ASSEMBLY
7. Perform the following steps, in the order given, to prepare the receiver for the purity adjustment procedure. a. Face the receiver in the "magnetic north" direction. b. Externally degauss the receiver screen with the television power turned off. c. Turn the television on for approximately 10 seconds to perform internal degaussing and then turn the TV off. d. Unplug the internal degaussing coil. This allows the thermistor to cool down while you are performing the purity adjustment. DO NOT MOVE THE RECEIVER FROM ITS "MAGNETIC NORTH" POSITION. e. Turn the receiver on and obtain a red raster by increasing the red bias control (CW) and decreasing the bias controls for the remaining two colors (CCW). f. Attach two round magnets on the picture tube screen at 3 o'clock and 9 o'clock positions, approximately one (1) inch from the edge of the mask (use double-sided tape).
1.ADJUST YOKE Z-AXIS FIRST TO GET EQUAL BLUE COLOR CIRCLES
2 .ADJUST BEAM BENDER 2 POLE MAGNET TO GET FOUR EQUAL COLOR CIRCLES
MAGNETS
RED
RED
8. Referring to above, perform the following two steps: a. Adjust the yoke Z-axis to obtain equal blue circles. b. Adjust the appropriate beam bender tabs to obtain correct purity (four equal circles). 9. After correct purity is set, tighten the yoke clamp screw and remove the two screen magnets. 10. Remove the AC power and rotate the receiver 180 degrees (facing "magnetic south"). 11. Reconnect the internal degaussing coil. 12. Turn the receiver on for 10 seconds (make sure the receiver came on) to perform internal degaussing, and then turn the receiver off. 13. Unplug the internal degaussing coil. 14. Turn on the receiver and check the purity by holding one (1) round magnet at the 3 o'clock and a second round magnet at 9 o'clock position. If purity is not satisfactory, repeat steps 8 through 14. 15. Turn off the receiver and reconnect the internal degaussing coil.
6. Reconnect the internal degaussing coil and apply AC power. 7. Turn the receiver on for 10 seconds to perform internal degaussing and then turn the receiver off again. 8. Unplug the internal degaussing-coil. 9. Turn on the receiver, connect a signal generator to the VHF antenna terminal and apply a crosshatch signal.
Caution: During the convergence adjustment procedure, be very careful not to disturb the purity adjustment tabs are accidentally move, purity should be confirmed before proceeding with the convergence adjustments. Note: Make sure the focus is set correctly on this instrument before proceeding with the following adjustment.
10. Converge the red and blue vertical lines to the green vertical line at the center of the screen by performing the following steps (below TABLE). a. Carefully rotate both tabs of the 4-pole ring magnet simultaneously in opposite directions from the 12 o'clock position to converge the red and blue vertical lines. b. Carefully rotate both tabs of the 6-pole ring magnet simultaneously in opposite directions form the 12 o'clock position to converge the red and blue (now purple) vertical lines with the green vertical line. 11. Converge the red and blue horizontal with the green line at the center of the screen by performing the following steps. (below TABLE) a. Carefully rotate both tabs of the 4-pole ring magnet simultaneously in the same direction (keep the spacing between the two tabs the same) to converge the red and blue horizontal lines. b. Carefully rotate both tabs of the 6-pole ring magnet simultaneously in same direction (keep the spacing between the two tabs the same) to converge the red and blue (now purple) horizontal lines with the green horizontal line. c. Secure the tabs previsouly adjusted by locking them in place with the locking tabs on the beam bender.
* Convergence Adjustment
Caution: This procedure DOES NOT apply to bonded yoke and picture tube assemblies. Do not use screen magnets during this adjustment procedure. Use of screen magnets will cause an incorrect display.
1. Remove AC power and disconnect the internal degaussing coil. 2. Apply AC Power and set the brightness to the Picture Reset condition. Set the Color control to minimum. 3. Apply 8V to the pin. 4. Adjust the Red, Green and Blue Bias controls to get a dim white line. 5. Remove the AC power and 8V from the pin.
3-3
RING PAIRS
ROTATION DIRECTION OF BOTH TABS
MOVEMENT OF RED AND BLUE BEAMS
B OPPOSITE 4 POLE SAME B R OR
B R
R
OR
B
R
B OPPOSITE R 6 POLE SAME B R OR OR
B R
B
R
UP/DOWN ROCKING OF THE YOKE UP/DOWN ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES RASTERS AND BLUEOPPOSITE ROTATION OF RED
AND BLUE RASTERS
LEFT/RIGHT ROCKING OF THE YOKE LEET/RIGHT ROCKING OF THE OF THE CAUSES OPPOSITE SIZE CHANGE YOKE CAUSES OPPOSITE SIZE RED AND BLUE RASTERS CHANGE OF
THE RED AND BLUE RASTERS
GREEN
GREEN
ADJUSTMENT VIEWING AREA
BLUE
RED
ADJUSTMENT VIEWING AREA
RED RED
GREEN
RED BLUE
BLUE RED
GREEN
RED
BLUE TV SCREEN
GREEN
12. While watching the 6 o'clock positions on the screen, rock the front of the yoke in a vertical (up/down) direction to converge the red and blue vertical lines. (Fig upper left) 13. Temporarily place a rubber wedge at the 12 o'clock position to hold the vertical position or the yoke. 14. Check the 3 o'clock and 9 o'clock areas to confirm that the red and blue horizontal lines are converged. If the lines are not converged, slightly offset the vertical tilt of the yoke (move the rubber wedge if necessary) to equally balance the convergence error of the horizontal lines at 3 o'clock and 9 o'clock and the vertical lines at 6 o'clock and 12 o'clock. 15. Place a 1.5 inch piece of glass tape over the rubber foot at the rear of the 12 o'clock wedge. 16. While watching the 6 o'clock and 12 o'clock areas of the screen, rock the front of the yoke in the horizontal (left to right) motion to converge the red and blue horizontal lines. (Fig. upper right)
17. Temporarily place a rubber wedge at the 5 o'clock and 7 o'clock positions to hold the horizontal position of the yoke. 18. Check the 3 o'clock and 9 o'clock areas to confirm that the red and blue vertical lines are converged. If the lines are not converged, slightly offset the horizontal tilt of the yoke (move the temporary rubber wedges if necessary) to equally balance the convergence error of the horizontal lines at 6 o'clock and 12 o'clock and the vertical lines at 3 o'clock and 9 o'clock. 19. Using a round magnet confirm purity at the center, right and left sides and corners. See Purity Adjustment Procedure. 20. Reconfirm convergence and apply a 1.5 inch piece of glass tape over the rubber foot at the rear of the 5 o'clock and the 7 o'clock wedges.
3-4
FRONT LOADING MECHANISM DISASSEMBLY
¡ < Front Loading Mechanism Assembly, Parts Location
5. Arm Assembly F/L 9. Plate Ground (L) 6. Plate Reflector 3. Top Plate 8. Plate Ground (R)
6. Plate Reflector 4. Holder Assembly Cassette 2. Bracket Assembly Side(R)
1. Guide Cassette
7. Opener Door
¡ÿ Component list below will be discribed as if the top and bottom covers, front panel and deck mechanism assembly have already been removed. 1. Guide Cassette 2. Bracket Assembly Side (R)
3. 4. 5. 6. 7. 8. 9.
Top Plate Holder Assembly Cassette Arm Assembly F/L Plate Reflector Opener Door Plate Ground(R) Plate Ground(L)
4-1
FRONT LOADING MECHANISM DISASSEMBLY
1. Front Loading Mechanism Assembly (Fig. A-1)
1) Remove the Top and Bottom Covers and Front Panel. 2) Remove two screws(A). 3) Lift up the Front Loading Mechanism Assembly in the direction of arrow(B).
3. Bracket Assembly Side) (R (Fig. A-3)
1) Push the tabs(L), (R) of Bracket Assembly Side(R) to disengage with the Top Plate and remove it in the direction of arrow(A).
NOTE
When disassembling and reassembling: a.Give special attention to removal and to reassembly because two tabs(L), (R) are engaged.
Top Plate Plate Ground (A) (A) (R) (A) (B) Bracket Assembly Side(R)
(L)
Fig. A-3 Bracket Assembly Side(R)
4. Bracket Side(L)/ op Plate (Fig. A-4) T
(L) (R)
Fig. A-1 Front Loading Mechanism
1) Remove the screw(B). 2) Remove the plate Ground(L), in the direction of arrow(A). 3) Push the locking tab(L1) and then remove the Bracket Side(L) in the direction of arrow(B). 4) The Top Plate can be removed by Separating the Bracket Side(L).
2. Guide Cassette (Fig. A-2)
1) Push tab(R) of the Cassette Guide and disengage with Bracket Side(R) and push tab(L) of the cassette Guide which is engaged with Bracket Side(L) and remove it in the direction of arrow (B).
(A) (B) Hook(L) (B) Top Plate Plate Ground(L)
(L)
(C) (L1) Brackdt Side(L)
(B) Cassette Guide (B)
Fig. A-4 Bracket Side(L)/Top Plate
(R)
Fig. A-2 Guide Cassette
4-2
FRONT LOADING MECHANISM DISASSEMBLY
5. Holder Assembly Cassette (Fig. A-5)
1) Separate the Bracket Assembly Side(R). 2) Push the two lever tabs(L), (R) down and separate the Holder Assembly Cassette and the Arm Assembly F/L from the Top Plate.
7. Spring Stopper (Fig. A-7)
1) Remove the Spring Stopper which is connected to the tabs(A), (B) of the Lever Stopper(R) and the Bracket Holder(R).
Lever Stopper(R) Spring Stopper
(A) (B)
Holder Assembly Cassette
Bracket Holder(R)
Fig. A-7 Spring Stopper Fig. A-5 Holder Assembly Cassette
8. Plate Reflector (Fig. A-8) 6. Arm Assembly F/L (Fig. A-6)
1) Remove by pulling the Arm F/L(R) from the Bracket Holder(R) Boss in the direction of arrow(A). 2) Separate the Arm Assembly F/L from Cassette Holder Boss in the direction of arrow(B). 1) Detach the Plate Reflector(L) from the Bracket Side(L) by using a knife. 2) Detach the Plate Reflector(R) from the Bracket Assembly Side(R) by using a knife.
NOTE
When disassembling and reassembling: a. Be sure to remove the Arm F/L(R) first. If not the Arm Assembly F/L can be damaged.
Bracket Side(L) Plate Reflector (L), (R) Bracket Assembly Side(R)
(B)
Fig. A-8 Plate Reflector
(A) Arm Assembly F/L
Fig. A-6 Arm Assembly F/L
4-3
DECK MECHANISM DISASSEMB Y L
< * Deck Mechanism Parts Location
TOP VIEW
A/C Head Assembly Auto Head Cleaner Assembly Bracket Assembly L/D Motor
Drum Brush
FE Head Drum Assembly Base Assembly P2/P3 Tension Arm Assembly Supply Reel Assembly (S27) TAB Lever
Holder Assembly Pinch Arm Assembly T/up Gear Pinch Cam
Plate Up Take-up Reel Assembly (T27)
BOTTOM VIEW
Capstan Motor Assembly
Mode Switch Slider Plate Gear Pulley H1 Lever Gear H2/H1 Clutch Assembly T27
Bracket Cam Clutch Assembly S27 Arm Assembly Idler
4-4
DECK MECHANISM DISASSEMB Y L
1. Auto Head Cleaner Assembly (Fig. B-1)
(Optional Item) 1) Push the tab(A) of Auto Head Cleaner and remove the Cleaner Arm Assembly.
Drum Assembly (A) Drum Brush
NOTES:
When disassembling and reassembling: a. Do not allow fingers or tools to touch the outside of the Drum. b. Be careful not to get any foreign substance on the Roller.
(A) Drum Base 7(A)
(B) Cleaner Arm Assembly (A)
Fig. B-2 Drum and Base Assembly
3. Drum Sub Assembly and Motor Assembly (Fig. B-3-1)
Fig. B-1 Auto head cleaner Assembly
1) Remove the Drum Base from the Deck Mechanism Assembly. 2) Separate the Drum Assembly from the Drum Base. 3) Remove two screws(A) and then remove the rotor. 4) Remove three screws(B) and then remove the stator.
2. Drum and Base Assembl (Fig. B-2) y
1) Remove the Auto Head Cleaner Assembly. (option) 2) Remove three screws(A) and separate the Drum Assembly, Drum Base and the Drum Brush from the Deck Mechanism Assembly. 3) Remove three screws(B) on the back side and remove the Drum Assembly from the Drum Base.
NOTE
When disassembling and reassembling: a. Do not touch the video tips with fingers or tools.
NOTES:
When disassembling and reassembling: a. Do not touch the video tips with fingers or tools. Give special attention to disassembling and reassembling of Auto Head Cleaner Assembly. b. After assembling, adjust the tape transport system and Servo PG.
Drum Sub Assembly
stator Motor Assembly
(B) (A)
rotor
Fig. B-3-1 Drum Sub and Motor Assembly
4-5
DECK MECHANISM DISASSEMB Y L
4. A/C (Audio/Control) Head Assembly (Fig. B-4)
1) Unplug the A/C connector from the Loading Motor P.C.B. 2) Remove two screws(A) and remove the A/C Head Assembly from the Deck Mechanism Assembly.
5. FE (Full Erase) Head Assembl (Fig. B-5) y
(Optional Item)
1) Push two tabs(A) and remove the FE Head.
NOTE
When disassembling and reassembling: a. Be careful not to get any foreign substance on the FE Head.
NOTES:
When disassembling and reassembling: a. When assembling, the 3mm hole of the Base A/C should coincide to 3mm hole in the Chassis. b. Do not touch the A/C Head Tips with fingers or tools. c. After reinstalling the Audio Control Head Assembly, adjust the Tilt, Azimuth and Height of A/C Head.
(A)
(A)
Fig. B-5 FE Head Assembly
Fig. B-4 A/C Head Assembly
4-6
DECK MECHANISM DISASSEMB Y L
6. Plate Up/Supply Main Brake/Take up Main Brake/Body Prism Led Assembly (Fig. B-6)
1) Plate Up a. Remove three screws(A) and remove the Plate Up. 2) Supply Main Brake a. Remove the Spring MB. b. Lift up the Supply Main Brake. 3) Take-Up Main Brake a. Lift up the Take-Up Main Brake. 4) Body Prism Led a. Remove the Body Prism Led.
(A) (A) Plate Up Spring Tension SMB Body Prism Led TMB (B) Spring MB (C) (D) Lever Ass'y Tension Holder Band (A) Holder Band (C) Holder Band (B) (A) Tension shaft Tension Arm
NOTES:
When disassembling and reassembling: a. (D) is engaged to the cam groove of the Gear Cam L/D and two tabs(C) are engaged in the chassis. (care must be taken not to damage the two tabs when disassembling and reassembling) b. When disassembling, turn to the counterclockwise and lift up so that grease which may be on (D) is not transfered to the Reel Brake Drum. c. When assembling, the 2.5mm hole of the Lever Assembly Tension should be aligned with the 2.5mm hole in the chassis. d. After reassembling, adjust the Tension.
(C)
Chassis Hole (2.5mm) (A)
Fig. B-7 Tension Arm/Lever Assembly Tension
8. TAB Lever (Fig. B-8)
Fig. B-6 Plate up/SMB/TMB/BPL
(Optional Item) 1) Remove the Lever Ass'y Tension. 2) Remove the Spring TAB. 3) Push the tab(A) on the bottom side of TAB Lever and remove the TAB Lever.
Spring TAB
7. Tension Arm/Lever Assembly Tension (Fig. B-7)
1) Remove the Spring Tension. 2) Push the tab(A) of the Base Tension on the back cover of the Deck Mechanism Assembly outward and remove the Tension Arm Assembly. 3) Push the tab(B) on the back side of the Holder Band(A) and remove the Tension Arm Assembly. 4) Push two tabs(C) on the bottom side of the Lever Tension and Lift up the Lever Assembly Tension.
(A)
TAB Lever
Fig. B-8 TAB Lever 4-7
DECK MECHANISM DISASSEMB Y L
9. Supply Reel/Take Up Reel Assembly (Fig. B-9)
1) Lift up Reel(S), (T) after removing the Plate Up and Band Assembly.
11. Gear H1, H2/Lever H (Fig. B-11) 1
1) 2) 3) 4) Push and lift up the hook(B) of Lever H1. Remove the washer(A) and then lift up the Gear H1. Lift up the Spring H1. Push and lift up the hook(B) of the Gear H2.
NOTES:
a. Be sure not to interchange the Take-up Reel and the Supply Reel. b. Do not allow the Brake Drum to come in contact with grease.
(B) Lever H1
Supply Reel(S27) (White)
(B) Gear H2
Washer(A) Gear H1 Spring H1
Take-up Reel(T27) (Black)
(C)
Fig. B-11 Gear H1,H2/Lever H1
Fig. B-9 Supply Reel/Take-up Reel Assembly
12. Arm Assembly Idler (Fig. B-12)
1) Lift up the Gear Pulley after removing the washer(A). 2) Lift up the Spring Up/D after removing the washer(B). 3) Lift up the Arm Assembly Idler.
Washer(A)
10. Gear Pulley/Belt Capstan (Fig. B-10)
1) Turn over the Deck Mechanism Assembly. 2) Remove the Belt Capstan. 3) Remove the washer(A) and then lift up the Gear Pulley.
Washer(B) Belt Capstan Washer(A) Gear Pulley Arm Ass'y Idler Spring Up/D
Fig. B-12 Arm Assembly Idler
Fig. B-10 Gear Pulley /Belt Capstan
4-8
DECK MECHANISM DISASSEMB Y L
13.Mode S/ (Fig. B-13) W
1) Lift up the Lever H1. 2) Remove the screw(A) and lift up the Mode S/W.
15.CAM Bracket Assembl (Fig. B-15) y
1) Remove three screws(A). 2) Remove the CAM Bracket Assembly.
NOTE
a. When assembling mode, the groove of Gear ( ( o ) of the Mode Switch should be aligned.
Lever H1
NOTE
(A) Mode S/W (A)
Groove ( o), (
)
Fig. B-13 Mode S/W
14. Capstan Motor Assembly (Fig. B-14)
1) Remove three Screws(A) on the top side and remove the Capstan Motor Assembly.
Capstan Motor CAM Bracket
(A)
(A) (A)
Fig. B-14 Capstan Motor Assembly
4-9
U
) and Body
a. The (Tension Shaft Holder) fixes the Tension Shaft on Fig B-7. therefore when the CAM Bracket Assembly is removed, First remove the Tension Arm on Fig B-7.
(A)
CAM Bracket
(A) (Tension shaft Holder)
U
Fig. B-15 CAM Bracket Assembly
16. Cam Bracket/Lever Jog/Gear Jo (Fig. B-16) g (Optional Item)
1) 2) 3) 4) Remove the Cam Bracket Assembly. Remove the Spring Jog. Push the tab(A) and remove the Lever Jog. Push the tab(B) and remove the Gear Jog.
NOTE
a. The tab(B) on the Gear Jog should be in groove of the Lever Jog.
(A) Gear Jog Lever Jog Spring Jog
(B)
Fig. B-16 Cam Bracket/Lever Jog/Gear Jog
DECK MECHANISM DISASSEMB Y L
17. Gear Cam L/ (Fig. B-17) D
1) Remove the Cam Bracket Assembly. 2) Remove the Gear Cam L/D.
19. Gear Assembly P2/P (Fig. B-19) 3
1) Remove the Plate Slider. 2) Remove by pushing one hook(B) on the top side of Gear Assembly P3. 3) Remove by pushing one hook(A) on the top side of Gear Assembly P2.
NOTE
1) When assembling the Gear Cam L/D, the groove ( ) of Plate Slider should coincide with to the groove ( ) on the Gear Cam L/D.
NOTES:
When disassembling and reassembling: a. The P2 and P3 Gear Assembly should not be interchanged. b. The groove( ) of Gear P2 should be aligned to the groove( ) of Gear P3. c. Set the hole of Lever to the Boss of P2 and P3 Base Assembly. (When assembling make sure that the Lever is not bent.)
CAM Bracket
Gear CAM L/D
GEAR P3
GEAR P2
(A)
(B) Lever
Fig. B-17 Gear Cam L/D
BOSS
18. Gear PS/Plate Slide (Fig. B-18) r
1) Remove two washers(C). 2) Remove the Plate Slider. 3) Remove the Gear PS.
BOSS
Fig. B-19 Gear Assembly P2/P3 NOTE
1) When the hole(A) of the Gear PS is aligned to the hole(B) of the chassis, the groove( ) of the Plate Slider should be aligned to the groove( ) of the Gear PS.
20. Base Assembly P2/P (Fig. B-20) 3
1) Remove the P2/P3 Gear Assembly. 2) Remove the P2/P3 Base Assembly.
(C) BASE P2
BASE P3
(A) Gear PS
(C) Plate Slider
(B)
Fig. B-18 Gear PS/Plate Slider
Fig. B-20 Base Assembly P2/P3
4-10
DECK MECHANISM DISASSEMB Y L
21.Guide Roller Assembl (Fig. B-21) y
1) Remove two screws(A). 2) Remove the Guide Roller From the Base P2/P3 by turning it.
23.Clutch Assembly T2 (Fig. B-23) 7
1) Remove the Gear H1 and Arm Assembly Idler. 2) Remove the washer(A). 3) Remove the Clutch Assembly T27.
NOTE
When disassembling and reassembling: a. The P2 and P3 Base should not be interchanged.
Washer (A) Clutch T27
Guide Roller (A) BASE P2
Guide Roller
(A) BASE P3
Fig. B-23 Clutch Assembly T27
Fig. B-21 Guide Roller Assembly
24. Lever F/R & ArmR (Fig. B-24) F/
1) 2) 3) 4) 5) Remove the Plate Slider. Remove the washer(A). Remove the Lever F/R. Remove the Arm Assembly Idler. Remove the Arm F/R.
22.Clutch Assembly S2 (Fig. B-22) 7
1) Remove the Gear Cam L/D and the Arm Assembly Idler. 2) Remove the washer(A). 3) Remove the Clutch Assembly S27.
NOTE
1) When disassembling the Arm F/R should be horizontal.
Washer (A) Clutch S27 Washer (A) Lever F/R
ARM F/R
Fig. B-22 Clutch Assembly S27 R Fig. B-24 Lever F/ & Arm F/R
4-11
DECK MECHANISM DISASSEMB Y L
25. Holder Pinch Assembl (Fig. B-25) y
1) Separate the Holder Pinch Assembly by pushing tab(A) on the L/D Motor Bracket in the direction of arrow (B).
27. L/D Motor Bracket Assembl (Fig. B-27) y
1) Remove three Screws(A). 2) Push the tabs(A) and remove the L/D Motor Bracket Assembly.
NOTES:
When assembling and disassembling: a. Make sure Grease from the Gear Pinch does not come in contact with the wing of the L/D Motor Bracket.
(A) (A) B L/D Motor Bracket (A)
Holder Pinch
(A)
(A)
Chassis
Fig. B-25 Holder Pinch Assembly Fig. B-27 L/D Motor Bracket Assembly
26.Pinch Arm Assembl (Fig. B-26) y
1) Remove the Spring Pinch. 2) Remove the Pinch Arm Assembly by turning it counterclockwise.
Spring Pinch Pinch Arm Pinch Roller
28. Worm Wheel (Fig. B-28)
1) Remove the L/D Motor Bracket Assembly. 2) Push two Tabs(A) on the L/D Motor Bracket and then remove it.
Worm Wheel (A)
Fig. B-26 Pinch Arm Assembly Fig. B-28 Worm Wheel
4-12
DECK MECHANISM DISASSEMBLY
29. L/D Motor Assembly & Worm L/D Motor & L/D Motor Bracket (Fig. B-29)
1) Remove the L/D Motor Bracket Assembly. 2) Push the L/D Motor Assembly in lower direction and then remove. 3) Remove the Worm L/D Motor from the L/D Motor Assembly in the direction of arrow (A). 4) Remove the L/D Motor Assembly and the Worm L/D Motor and then L/D Motor Bracket is removed.
31. Gear Pinch (Fig. B-31)
1) 2) 3) 4) Remove the Pinch Arm Assembly. Remove the Gear CNT. Remove the Gear Pinch. When reassembling, make sure that the two teeth, Gear pinch CAM(£ ) and Gear pinch(£ ), with timing marks line up with the arrow at two o'clock on the Pinch Cam Gear. (See Fig on B-30)
L/D Motor Bracket
Gear Pinch
L/D Motor Ass'y
(A) Worm L/D Motor
Gear Pinch CAM
Fig. B-29 L/D Motor Assembly/ Worm
L/D Motor/ L/D Motor Bracket
Fig. B-31 Gear Pinch
32. T/Up Arm Assembly (Fig. B-32)
1) Remove the L/D Motor Bracket Assembly. 2) Turn over the T/Up spring and separate the T/Up Arm Assembly. 3) Remove the spring.
30 . Gear CNT (Fig. B-30)
1) Remove the L/D Motor Bracket Assembly. 2) Remove the Pinch Arm Assembly. 3) Remove the Gear CNT.
Gear Pinch
T/Up Arm
T/Up Spring
Gear CNT B A
Gear Pinch CAM
Fig. B-30 Gear CNT Fig. B-32 T/up Arm Assembly
4-13
DECK MECHANISM DISASSEMB Y L
33.Gear Pinch Cam (Fig. B-33)
1) Remove the T/Up Arm Assembly. 2) Remove by pushing one tab(A) on the bottom side of the Gear Pinch Cam.
NOTE
When disassembling and reassembling: a. The small hole on the Gear Pinch Cam and hole of chassis should be aligned.
Gear Pinch CAM
(A)
Fig. B-33 Gear Pinch Cam
4-14
MECHANISM ADJUSTMENT
¡ < Tools and Fixtures for Deck
1. Cassette Torque meter Parts No: D00-D006 2. Alignment tape Parts No NTSC: DTN-0001 PAL: DTN-0002 3. Torque gauge Parts No: D00-D002
SR K
-V
HT
-S
300
250 200 150
0 50
VID CAS EO S TOR ETTE Q MET UE VHT ER -303
SR
K
K - V H T 0T SR 50 100 150
200 250
300
4. Torque gauge adaptor Parts No: D09-R001
5. Post height adjusting driver Parts No: DTL-0005
6. + Type driver (¿5) Obtain locally
4-15
MECHANISM ADJUSTMENT
1. Mechanism and Mode Switch Alignment Check
Purpos : To determine if the mode switch and mechanism are in the correct position, when a e tape is ejected from the loading mechanism.
Test Equipment / Fixture
*
Test Conditions VCR (VCP) State
*
Check Point
*
Blank tape
Eject Mode (with cassette ejected)
Mechanism and Mode Switch Position
1) Turn power on and eject the cassette by pressing the eject button. 2) Remove the top and bottom covers. 3) Visually check the alignment of the Pinch Cam gear and PS gear holes, line up with holes in the chassis (figure C-2). 4) If the gears in step 3 do not align as indicated, then rotate the shaft of the loading motor to either the clockwise or counterclockwise direction until alignment does occur.
5) Turn the unit over and remove the main P.C.B thus exposing the bottom side of the deck mechanism. 6) Check the alignment of the mode switch as illustrated in figure C-1, (A). 7) If the alignment is incorrect then remove the mode switch and align as shown in figure C-1 with out changing the position of the Pinch Cam gear and PS gear. 8) Remount the mode switch and main P.C.B assembly and check operation.
CHECK DIAGRAM
Mode S/W
(A)
Gear (
) and Body (¡Û) groove alignme t n
BOTTOM VIEW
Fig. C-1
Gear Pinch Cam Hole
Gear PS
Hole
TOP VIEW
Fig. C-2
4-16
MECHANISM ADJUSTMENT
2. Preparation for Adjustment (To set VCR (VCP) to the loading state without inserting a cassette.)
1) 2) 3) 4) Unplug the Power Cord from the AC outlet. Separate the Top Cover and Front Loading Mechanism. Plug the Power Cord into the AC outlet. Turn the VCR on and push the tact switch in the P.C.B. Assembly. The VCR can accept inputs for each mode in this case. However the rewind and review operation cannot be performed for more than a few seconds because the take-up reel table is in the stop state and reel pulses cannot be detected.
NOTES:
Always return the VCR(VCP) to the Front Loading Mechanism Assembly State in the following order after the above operations have been performed. 1) Press the Eject button after turning the power ON. 2) Wait for about 10 seconds until searching out the assembly position. 3) Assemble the Front Loading Mechanism and connect the Front Loading Mechanism Connector. 4) Refer to the "Front Loading Mechanism Disassembly" Section.
NOTE
Cover the holes in the end sensors with black tape to prevent a light leak.
3. Tension Post Position and Tension Adjustment
Purpos : To insure uniform tape contact with the video head by maintaining constant tape e tension.
Test Equipment / Fixture
*
Test Conditions VCR(VCP) State
*
Adjustment Point
*
Cassette Torque Meter (For play 100g/cm)
*
Position Adjustment: Play without a cassette Tension Check: Play
Holder Band B and C
Position Adjustment
1) Remove cassette. 2) Adjust the position of tension post in accordance with figure C-3.
Tension Adjustment
1) Turn on VCR and load the cassette torque meter. 2) Press the play button and observe the torque tension on the supply reel (spec. 37g/cm+5g/cm). 3) If torque is out of spec. then use a Phillips screw driver and move the screw head located in the center of the B and C band hold; to either the right or left until correct torque is indicated.
NOTE
Align the Tension Post (2mm) to the hole in the Chassis (2.5mm).
Lever Tension Post P1 Post Tension Tension Arm Chassis Hole ( 2.5mm) Toleranc ¡æ0.3mm with in e Post P0 Hold Band(C) Hold Band(B)
Fig. C-3
4-17
MECHANISM ADJUSTMENT
4. Checking Torque
Purpos : To insure smooth transport of the tape during each mode of operation. If tape e transport is abnormal, then check the torque as indicated by the chart below.
Test Equipment / Fixture
Torque Gauge(600 g/cm ATG) Torque Gauge Adaptor * Cassette Torque Meter V NTSC: 16.67msec PAL: 20msec
* * *
Test Conditions VCR(VCP) State
Set the VCR to each operating mode without inserting a cassette. (See '2. Preparation for Adjustment'. Page 4-17)
Item
Slack Removal Torque Fast Forward Torque Rewind Torque Play Take-Up Torque Review Torque
Mode
Unloading Fast Forward Rewind Play Review
Test Equipment
Cassette Torque Meter Cassette Torque Gauge Cassette Torque Gauge Cassette Torque Meter Cassette Torque Meter
Measurement Reel Measurement Values
Supply Reel Take-Up Reel Supply Reel Take-Up Reel Supply Reel More than 150~270g/cm More than 500g/cm More than 500g/cm 55~95g/cm 170~250g/cm
Checking Method:
The Values are measured by using a torque gauge and torque gauge adaptor with the torque gauge affixed.
NOTE
The torque reading to measure occurs when the tape abruptly changes direction from fast forward or rewind mode, when quick braking is applied to both reels.
Torque Gauge
Torque Gauge Adaptor
SR K
-V
HT
-S
300
250 200 150
0 50
VID CAS EO S TOR ETTE Q MET UE VHT ER -303
SR
K
K - V H T 0T SR 50 100 150
200 250
Reel Table
300
Fig. C-5
Fig. C-4
4-18
MECHANISM ADJUSTMENT
5. Guide Roller Height Adjustment
Purpos : To regulate the height of the tape so that the bottom of the tape runs along the e tape guide line on the lower drum.
A. Preliminary Adjustment Test Equipment / Fixture
* *
Test Conditions VCR(VCP) State
*
Adjustment Point
*
Post Height Adjusting Driver Hexagonal Wrench or Allen Wrench Phillips screw driver
Allows a good tape to play normally in spite of a damaged guide roller.
Guide Roller Height Adjustment screws on the Supply and Take-Up Guide Rollers.
GUIDE ROLLER HEIGHT ADJUSTMENT SCREW UPPER FLANGE
Adjustment Procedure
1) Perform the precise adjustment(See below B). 2) If the Guide Roller is damaged, loosen the Guide Roller retaining screw and replace the Guide Roller. 3) Adjust the height of P2, P3 so that TAPE is adjacent to the guide line.
ADJUSTMENT DIAGRAM
GUIDE ROLLER RETAINING SCREW
Fig. C-5-1 B. Precise Adjustment Test Equipment / Fixture Test Equipment Connection Points Test Conditions VCR(VCP) State
* * *
Adjustment Point
*
Oscilloscope Alignment Tape Post Height Adjusting Driver
* * *
*
CH-1: PB RF Envelope CH-2: NTSC: SW 30Hz PAL : SW 25Hz Head Switching Output Point RF Envelope Output Point
*
Play an alignment tape
Guide Roller Height Adjustment Screws.
Waveform Diagrams
P2 POST ADJUSTMENT
Adjustment Procedure
1) Play an alignment tape after connecting the probe of the oscilloscope to the RF Envelope Output Test Point and Head Switching Output Test Point. 2) Tracking Control (in PB mode): Center position (When this adjustment is performed after the drum assembly has been replaced, set the tracking control so that the RF output is maximum.) 3) Height adjustment screw: Flatten the RF waveform. (Fig. C-5-2) 4) Turn (Move) the tracking control (in the Playback mode) clockwise and counterclockwise. (Fig. C-5-3)) 5) Check that any drop of RF output is uniform at the start and end of the waveform.
P3 POST ADJUSTMENT
Fig. C-5-2
Turn the Roller Guide Height Adjustment Screw slightly to flatten the waveform.
Tracking control at center
Turn (Move) the tracking control to both directions.
CAUTION
If the adjustment is excessive or insufficient the tape will jam or fold.
Fig. C-5-3 Connection Diagram
RF ENVELOPE OUTPUT TEST POINT HEAD SWITCHING OUTPUT TEST POINT
CH-1 CH-2
OSCILLOSCOPE
4-19
MECHANISM ADJUSTMENT
6. Audio/Control (A/C) Head Adjustment
Purpos : To insure that the tape passes accurately over the audio and control tracks in e exact alignment in both the record and playback modes.
A. Preliminary Adjustment (Height and tilt adjustment) Perform the Preliminary adjustment, when there is no Audio Output signal with a blank tape. Test Equipment / Fixture
* *
Test Conditions VCR(VCP) State
*
Adjustment Points
* * *
Blank Tape Screw Driver(+) Type 5mm
Play the blank tape (CTL Tape)
Tilt Adjustment Screw(C) Height Adjustment Screw(B) Azimuth Adjustment Screw(A)
Adjustment Procedure /Diagrams
1) Initially adjust the A/C head assembly as shown in figure C-6-1, by using the height adjustment screw(B). 2) Play a blank tape and observe if the tape passes accurately over the A/C head without tape curling or folding. 3) If folding or curling does occur then adjust the Tilt adjusting screw(C) while the tape is running to resemble figure C-6-3. 4) Confirm that the tape passes over the A/C head assembly as indicated by proper audio reproduction and proper tape counter performance.
NOTE
Ideal A/C head height occurs, when the tape runs between 0.2~0.25mm above the bottom edge of the A/C head core.
Tape ¡ 11.1¡æ0.05mm A/C Head P4 Tape 0.2~0.25 mm
Fig. C-6-1 A/C Head Base
Fig. C-6-3
X value Adjustment Screw(X) Azimuth Adjustment Screw(A)
Tilt Adjustment Screw(C)
Turning Center Fix
Height Adjustment Screw(B)
Fig. C-6-2 A/C Head Assembly
4-20
MECHANISM ADJUSTMENT
B. Confirm that the tape passes smoothly between the T/UP guide and the Pinch Roller (Using a mirror or the naked eye).
1) After completing step A. (Preliminary Adjustment), check that the tape passes around the T/UP post without folding at the top or bottom. If folding is observed, due the following: a. If folding is observed at the lower part of the T/UP post, then slowly turn the tilt adjustment in the clockwise direction to eliminate tape the curling. b. If folding is observed at the upper part of the T/UP post, then slowly turn the tilt adjustment in the counterclockwise direction to eliminate the tape curling.
C. RF Fine Adjustment (only if the RF waveform differs from figure C-5-3).
1) Check the RF Envelope after confirming smooth tape transport path at the T/UP Guide/Pinch Roller.
D. Precise Adjustment (Azimuth adjustment) Test Equipment / Fixture
* * *
Test Equipment Connection Point
*
Test Conditions VCR (VCP) State
*
Adjustment Points
* *
Oscilloscope Alignment tapes Screw Driver(+) Type 5mm
Audio output jack
Play an alignment tape 1KHz, 7KHz sections.
Azimuth Adjustment Screw(A) Tilt Adjustment Screw(C)
Adjustment Procedure
1) Connect the probe of oscilloscope to Audio Output Jack. 2) Alternately adjust the Azimuth adjustment screw(A) and the Tilt adjustment screw(C) for maximum output of the 1KHz and 7KHz segments, while maintaining the flattest envelope differential between the two frequencies.
1KHZ
7KHZ
A: Maximum
B: Maximum
Fig. C-6-4
7. X-Value Adjustment
Purpos : To obtain compatibility with other VCR(VCP). e
Test Equipment / Fixture
Oscilloscope Alignment tapes * Screw Driver(+) Type 5mm * Post Height Adjusting Driver
* * * *
Test Equipment Connection Point
CH-1: PB RF Envelope CH-2: NTSC: SW 30Hz PAL : SW 25Hz Head Switching Output Test Point RF Envelope Output Test Point
*
Test Conditions VCR (VCP) State
Play an alignment tape
Adjustment diagrams
Left
Groove at the Base A/C
*
*
Right
3mm Hole X value Adjustment Screw(X) Azimuth Adjustment Screw(A) Tilt Adjustment Screw(C) Height Adjustment Screw(B)
Adjustment Procedure
1) Loosen the fixed mounting and X Value adjustment screw. 2) Allow the mechanism to run long enough for auto tracking to complete it's cycle. 3) Move the A/C base laterally in the direction as shown in the diagram to find the center of the peak that allows for the maximum waveform envelope. This method should allow the 30um head to be centrally located over the 60um tape track. 4) Tighten the A/C head assembly mounting screws.
Adjustment Diagram
Turning Center
Fig. C-7
Fixed
OSCILLOSCOPE
Connection Diagram
RF ENVELOPE OUTPUT TEST POINT
CH-1
CH-2
HEAD SWITCHING OUTPUT TEST POINT
4-21
MECHANISM ADJUSTMENT
8. Adjustment after Replacing Drum Assembly (Video Heads)
Purpos : To correct for shift in the roller guide and X value after replacing the drum. e
Test Equipment / Fixture
* * * * *
Test Equipment Connection Points
* *
Test Conditions VCR (VCP) State
* *
Adjustment Points
*
Oscilloscope Alignment tape Blank Tape Post Height Adjusting Driver Screw Driver(+) Type 5mm
*
*
CH-1: PB RF Envelope CH-2: NTSC: SW 30Hz PAL : SW 25Hz Head Switching Output Test Point RF Envelope Output Test Point
Play the blank tape Play an alignment tape
* * *
Guide Roller Precise Adjustment Switching Point Tracking Preset X-Value
Checking/Adjustment Procedure
Play a blank tape and check for tape curling or creasing around the roller guide. If there is a problem then follow the procedure 5. "Guide Roller Height" and 6. "Audio Control(A/C) Head Adjustment".
Connection Diagram
OSCILLOSCOPE
RF ENVELOPE OUTPUT TEST POINT
CH-1 CH-2
HEAD SWITCHING OUTPUT TEST POINT
Waveform
V1 V V2 V1/V MA §[ 0.7 X V2/V MA §[ 0.8 X RF ENVELOPE OUTPUT POINT
Fig. C-8
9. Check the Tape Travel after Reassembling Deck Assembly.
9-1. Check Audio and RF Locking Time during playback and after CUE or REV (FF/REW) Test Equipment / Fixture
* *
Specification
*
Test Equipment Connection Points
* * *
Test Conditions VCR (VCP) State
*
*
Oscilloscope Alignment tape (with 6H 3kHz Color Bar Signal) Stop Watch
*
RF Locking Time: Less than 5 sec. Audio Locking Time: Less than 10 sec.
*
CH-1: PB RF Envelope CH-2: Audio Output RF Envelope Output Point Audio Output Jack
Play an alignment tape (with 6H 3kHz Color Bar Signal)
Checking Procedure
Play an alignment tape then change the operating mode to CUE or REV and confirm if the unit meets the above listed specifications.
NOTES:
1) CUE is fast forward mode (FF) 2) REV is the rewind mode (REW) 3) Referenced to the Play mode
4-22
MECHANISM ADJUSTMENT
9-2. Check the condition between the Audio and Video Sync. (Lip Sync.) Test Equipment / Fixture
* *
Specification
*
Test Equipment Connection Points
* * *
Test Conditions VCR (VCP) State
*
Oscilloscope Alignment Tape
Less than¡¾V
*
CH-1: PB RF Envelope CH-2: Audio Output RF Envelope Output Point Audio Output Jack
Play an alignment tape
Checking Procedure
1) Confirm that the period ¨Í in Fig. C-9-1 is within ¡¾V. 2) If the result is abnormal, repeat adjustment #7. (X-Value adjustment) V NTSC: 16.67msec PAL: 20msec
V V RF SIGNAL
AUDIO SIGNAL
Í ¨
¡æ¤ V
Fig. C-9-1 9-3. Check for tape curling or jamming Test Equipment / Fixture
* *
Specification
*
VCR (VCP) State
*
T-160 Tape T-120 Tape
Be sure there is no tape jamming or curling at the begining, middle or end of a T-160 tape.
Run the CUE, REV play mode at the beginning and the end of the tape.
Checking Procedure
1) Confirm that the tape runs smoothly around the roller guides, drum and A/C head assemblies while abruptly changing operating modes from Play to CUE or REV. This is to be checked at the begining, middle and end sections of the cassette. 2) Confirm that the tape passes over the A/C head assembly as indicated by proper audio reproduction and proper tape counter performance.
4-23
MECHANISM ADJUSTMENT
10. Maintenance/Inspection Procedure
1) Required Maintenance
The recording density of a VCR(VCP) is much higher than that of an audio tape recorder. VCR(VCP) components must be very precise, at tolerances of 1/1000mm, to ensure compatiblity with other VCRs. If any of these components are worn or dirty, the symptoms will be the same as if the part is defective. To ensure a good picture, periodic inspection and maintenance, including replacement of worn out parts and lubrication, is necessary.
Tabel 2 Phenomenon
Poor S/N, no color
Inspection
Dirt on video head or worn video head
Tape does not run or tape is slack Vertical jitter, horizontal jitter
Dirt on pinch roller, belt or flywheel belt Dirt on video head or in tape transport system
2) Scheduled Maintenance
Schedules for maintenance and inspection are not fixed because they vary greatly according to the way in which the customer uses the VCR (VCP), and the environment in which the VCR (VCP) is used. But, in general home use, a good picture will be maintained if inspection and maintenance is made every 1,000 hours. The table below shows the relation between time used and inspection period. Color beats Low volume or distorted audio No Fast forward or rewind or rotation is slow
Dirt on full-erase head Dirt on audio/control head Dirt on belt
Table 1
When inspection is necessary Average hours used per day One hour About 1 year About 18 months About 3 years
4) Supplies Required for Inspection and Maintenance
(1) Grease Kanto G-311G or equivalent (2) Isopropyl Alcohol or equivalent (3) Cleaning Patches
¡å
¡å
¡å
5) Maintenance Procedure 5-1) Cleaning
(1) Cleaning video head First use a cleaning tape. If the dirt on the head is too stubborn to remove by tape, use the cleaning patch. Coat the cleaning patch with Isopropyl Alcohol. Touch the cleaning patch to the head tip and gently turn the head(rotating cylinder) right and left. (Do not move the cleaning patch vertically. Make sure that only the buckskin on the cleaning patch comes into contact with the head. Otherwise, the head may be damaged.) Thoroughly dry the head. Then run the test tape. If lsopropyl Alcohol remains on the video head, the tape may be damaged when it comes into contact with the head surface. (2) Clean the tape transport system and drive system, etc, by wiping with a cleaning patch wetted with Isporopyl Alcohol.
Two hours
Three hours
3) Check before starting repairs
The following faults can be remedied by cleaning and oiling. Check the needed lubrication and the conditions of cleanliness in the unit. Check with the customer to find out how often the unit is used, and then determine that the unit is ready for in spection and maintenance. Check the following parts.
NOTES:
a. It is the tape transport system which comes into contact with the running tape. The drive system consists of those parts which moves the tape. b. Make sure that during cleaning you do not touch the tape transport system with the tip of a screw driver and no that force is that would cause deforming or damage applied to the system.
4-24
MECHANISM ADJUSTMENT
Video Head (rotating cylinder)
Head Tip Touch this section of cleaning patch to the head tip and gently turn the head Fig. C-10-1
Coat With Isopropyl Alcohol
5-2) Greasing
(1) Greasing guidelines Apply grease, with a cleaning patch. Do not use excess grease. It may come into contact with the tape transport or drive system. Wipe any excess and clean with cleaning patch wetted in Isopropyl Alcohol. (2) Periodic greasing Grease specified locations every 5,000 hours.
GUIDE ROLLER DRUM ASSEMBLY FULL ERASE HEAD P1 POST TENSION POST P0 POST AUDIO CONTROL HEAD P4 POST POST T/UP TAPE
Fig. C-10-2 Tape Transport System
4-25
MECHANISM ADJUSTMENT
Phenomenon Inspection Replacement ¡Û ¨ç ¨è ¨ç Poor S/N no color Dirt on video head ¡Û ¨è ¨é Dirt on video head Dirt on tape transport system Low volume Sound distorted ¡Û ¨é ¨ê ¨ë
Color beats
Dirt on full-erase head
Vertical jitter
Dirt on audio/control head
¡Û
¨ê
Fig. C-10-3 Top VIEW
Tape does not run. Tape is slack. Dirt on pinch roller ¡Û ¨ë
Phenomenon
Inspection
Replacement
*
* *
No fast forward or rewind, or rotation is slow Tape does not run Slack tape
Dirt on reel belt
¡Û
¨ì ¨ì
In Review and Unloading (off mode), the Tape is rolled up loosely.
Clutch Ass'y S27 Torque reduced Cleaning Drum and transport system
¡Û
¨í
¨í
Fig. C-10-4 BOTTOM VIEW
Note
If locations marked with ¡Û do not operate normally after cleaning, check for wear and replace. See the EXPLODED VIEWS at the end of this manual as well as the above illustrations for the sections to be lubricated and greased.
4-26
12V
8V
H-SYNC
V-SYNC
A-OUT
V-A
V-B
A-MUTE
H-OUT
6VA 40V
P.CTL
5.3V
12V(A) M.CTL
12V(D) 2 4 6 7 9 10 11 12 P805 (TO VCD) 1 3 7 6 9 11 13 2 1 P703 (TO MAIN1)
14V(C)
P804 (TO MAIN1)
25V 25V 25V IC855 KIA7812
SPEAKER IC601 TDA2006 AUDIO AMP
15V
D/G COIL IC856 PQ12RF21 (14V) . ST-BY . MONITOR ON/OFF AFC IC852 KIA7806 IC853 KIA7808 B+ (115V) Q781 D2499 FBT HEATER ANODE VOLTAGE P901A 200V 1 5 (44V) IC857 KIA7806 POWER CONTROL CIRCUIT P2902
IC701 TDA8351 V.OUT
(14":P1902)
FROM VCD 1 IK (P1901B) P2901B VIDEO AMP TDA6107Q 3 R 5 G 7 B
CPT
TH801
11V
D801
9V
AC-IN P.CTL
Q862 A968
1 5 CPT BOARD
115V
MAIN2 BLOCK DIAGRAM
9
IC801 1 STR6707
40V
8
7
IC802 PC123Y
IC803 PC123Y
1
VCD BLOCK DIAGRAM
BPF
SOUND IF INPUT EXIT AUDIO INPUT
IC501 TDA8374A V/C/D WITH IF
SOUND DEMO. AUDIO DEMP
55
2
56
1
SOUND FILTER
BUF DEMO
PLL LOOP VIDEO OUT SCL SDA
VERTICAL SAWT-GEM
VCO FIL
VCO/2
VCO FIL
TUNER AGC AGC DECOUP REF-I INPUT VERT CAP 0VP INPUT IF INPUT IF INPUT VERT NEGA. VERT POSI E-W DRIVE GND
BANDGAP DECOUP CHROMA INPUT Y/CVBS INPUT VCC MAIN CVBS1 INPUT GND AUDIO OUT DECOUP FILTER CVBS2 INPUT BLACK CURRENT
VERT PROCESS
CVBS SWITCH
Q504
11
12
COLOR TRAP
13
H OSC
PHI1 FILTER
14
SCP GEN.
PHI2 FIL SCP/ FB IN H-OUT BLACK PEAK CAP.
15
16
STB
41
42
43
44
45
46
P501A 1 AGC 2 GND 3 IF 2 4 IF 1 5 GND 6 A-IN 7 GND 8 SCL 9 SDA 10 GND 11 A-OUT 12 GND 13 VIDEO OUT(2V) 14 BGIL 15 CVBS3(Y/C)
VCO
V/R
52
5
53
4
54
3
10
47
18
RGB OUT
BLUE OUT GREEN OUT RED OUT BEAM CURRENT
CVBS OUT VCC LOOP PHASE
19
38
39
Q532
17
40
SAW FILTER
SOUND TRAP
48
9
49
8
PRE -AMP
RGB SELECT
VCOX
9
6
4.43 X-TAL 3.58 X-TAL SECAM REF OUT R-Y INPUT B-Y INPUT R-Y OUT B-Y OUT
RGB CLAMP
R 10
5
RED INPUT GREEN INPUT BLUE INPUT FB INPUT Y INPUT Y OUT
R-Y/B-Y R-Y/B-Y SEDEM.SW CLAMP REF
PEAK CLAMP CORING BLK STR-
28
IC533 AN5860 (RGB-SWITCHING)
29
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
P502A CVBS OUT GND CVBS2(AV) GND R(OSD) G(OSD) B(OSD) FB(OSD) HP GND NTSC H R(EXT) G(EXT) B(EXT) FB(EXT)
20
FB
21
8
SW. PULSE GENER
7
22
35
G
36
B
37
BUFFER
14 12 11
METRIX
26
13
2
31
G
R
16
IC531 TDA4665 IH-DELAY
11
DC RESTOR
4
25
12
3
32
G
B
27
14
1
30
R
9
R-Y OUT
IC532 TDA8395 SECAM DET.
B-Y OUT 10
3
1
FROM MAIN2 P503A H-OUT GND X-RAY V-A GND 8V V-B GND A-OUT GND 12V ABL HP
TO CPT P504A IK 1 GND 2 3 R GND 4 5 G GND 6 7 B GND 8
Q01T
REF.IN
16
1
P01T 1 GND 2 TXT PST 3 SDA 4 SCL 5 5.3V
IC02T CF72416
5.3V
IC01T CF70206
2
5.3V
TO MAIN1
23
34
24
33
B
9
TO MAIN1
51
50
7
Z501
6
VOL
FROM/TO U-COM
IC401
1 18 17 PB 16 15 14 13 12 11 BUF 10 A.MUTE 1 Tuner VV/EE TU/AV ALC LINE PB EQ AMP 10 AUDIO OUT 5 Drum CTL 7 CAP CTL 2 3 4 5 6 7 8 9 REC EQ AMP
P02 P501B
GND 1
T402
FULL ERASE 2
4 5 6
3 2 1
Q407 Q408 Switching Circuit
REC 'H'
P03
2 CTL(-) CTL(+) 3 2 1 CTL AMP 4 GND 1
1
DPG
P502B
1 VIDEO OUT
SYNC SEP
1 Tuner
5
DFG
2 Tuner
T401 LPF
IC02 GL368
P302B
Vcc 8 5 6 7
JK201
21 19 17 15 13
5
C-SYNC
X02 X01 32.768KHZ 10M
IC01 KIA7033P
3 5.3VA 2 1
11 9 7 5
OSC
OSC
5.3V
3 1
COM RTN 20 VIDEO IN VIDEO OUT 18 FB RTN V.RTN 16 FB RED 14 N.C. RED RTN 12 N.C. GREEN 10 N.C. G RTN 8 FUC SW BLUE 6 AUDIO IN B RTN 4 A. GND AUDIO OUT 2 AUDIO IN AUDIO OUT
S02 T-UP END LD05 DECK IR LED S01 SUP END
MODE S/W
PMD O4 GND 1 MCBA MODE1 2 MODE2 3 MODE3 4 MODE4 5 SW11 CST SW SW10 REC SW 5.3V
IC05 GL7445
R/C RECEIVER
V IN
JK01
OUT(+) 2
VCC2 8 R08 5 SDA 6 SCK 3 2 1 6 AC 3 CS 10 NC 5 SIN OSC 7 GND 8 Vcc 4 S03
VCC1 7
IN(+) 6
GND 1
IN(-) 5
Vref 4
P2 9
P1 3
M LOADING MOTOR
4 SCK
2 OSC2
1 OSC1
5.3VA R04 R05
SYSTEM/AUDIO/SWITCHING BLOCK DIAGRAM
OUT(-) 10
FROM/TO U-COM
A IN
R11
9 LD+ 8 LD-
R09 C03 SUP REEL R10
IC03 ST24C16
G03 9 REC LED
,
8 T.REC LED
R07
IC04
T/UP REEL
1 S04 C02
2
3
R06
7 STBY LED OSD MUTE 14
CST IN LED 16
IC06 KIA7033P
CREEN 15
VERT 19
BLNK 12
BLUE 17
G01 LED03 STBY LED(red) CST IN LED(green) LED02 T.REC LED(red) LED04
HOR 18
FROM/TO U-COM VSS 11 FED 13 Vdd 20 12V
TU201
LG DATA CS CLK 5V
LED01 REC LED(red)
33V
INVERTER FROM/TO U-COM INVERTER
IF
12V AGC
BT
3
SECAM 'H'
PAL-NTSC
P3D01
1 PB-FM-IN 2 MOD-OUT 3 REG 4.2V REC-Y 4 MAIN-DEEMPH-OUT 5 CLAMP EMPH-OUT 6 R/P CTL
GND 42 ACC-FLT 41 YNR-CTL 40 KILL-FLT 39 REC C-OUT PB C-IN 38 AFC/APC FLT 37 SLD-FLT 36 BGP-OUT 35 VCC1 34 REC-APC-FLT 33 VXO-IN 32
7 MAIN-EMPH.FLT 8 NL-ENPH.FLT 9 PIC-CTL 10 AGC FLT2 11 NC-CTL 12 VIDEO-IN
A1 A2
A1 A2
EP/SP EP SP VCC
D301
L
VCC H
REC CURRENT AMP
Q317
XO-OUT 31 NTSC/MESECAM/PAL 30 CHROMA OUTPUT 29 CHROMA INPUT 28 NAP CTL 27 C-CCD IN 26 MODE-CTL 25
D304
X301
SW30 ENV DET GND
SW30 H CH ON L CH OFF
REC/PB REC PB
AGC H.SYNC DET VCC1
13 VCC2 14 SYNC OUT 15 VCA-FLT 16 VIDEO-OUT 17 COLOR ROTARY IN
Q308
18 VCA-IN 19 QV/QH INS 20 CCD DRIVE 21 AGC FLT1
Y/C BLOCK DIAGRAM
Q307
Q316
C-CCD DRIVE1 24 C-CCD DRIVE2 23 GND 22
TTM S&H
PD1 1HDL PD2
FREEQ CONV PP COMP
SW
4
IC301 LA7437
V. IN 5.3V VV 'H' LP / SP V. OUT SECAM 'H' H/SW NTSC 'H' TRICK 'H' C. SYNC DV-SYNC VE DET. ME SECAM 'H'
5
4
3
2
1
24
23
22
21
20
19
18
17
16
15
1K
14
13
Q315
IC303 LA7411
AGC
10
11
12
1
2
3
4
5
6
7
8
9
Q310 Q311 Q320 Q321 Q323 Q303
5 NC 11 CLK 6 Y-IN 9 VSS 7 VSS 1 VSS 3 VDD 4 C-IN2 2 C-IN1 10 COMP 8 Y-OUT
Auto MESECAM
D305
C381
5 6
4 7
3 8
2 9
1
IC304 LA7356
10
Q318
Q319
9 8 7 6 5 4 12 11 10
3
2
1
D351
IC305 TA1238N
IC302 LC89970
VSS 12
Q322
FSC OUT 19
PC OUT 14
VCO IN 13
C-OUT 21
CONT 20
VDD 15
VDD 17
VSS 16
VSS 22
RD 18
13
14
15
16
17
18
19
20
21
22
23
24
Q325
REC 'H'
PB 'H'
SUB-IF BLOCK DIAGRAM
Z02F L9453M L' / L
SOUND TRAP
SOUND FILTER
Q03F
IC01F TDA9812T
Z01F SAW
5.3V Q01F Q05F 12V
TU02F
5
12
AGC DET.
15 IC02Y LA7222
AGC CONT.
14
SUPPLY
5
4
3
1
2
6
FROM TUNER2 1 P03YA TU2-A-IN TU2-V-IN 2 3 4 IC04Y LA7222 IC03Y LA7222 NON-LL' H L L H 6 5 4 3 2 1 12 11 10 9 8 7 6 5 4 3 H 2 1 9 8 7 L 10 L 12 1TU 1TU 11 H
IC20Y LA7016
8
7
6
5
4
3
2
1
NON-LL'
Q02Y
9
8
10
7
Q26Y
11
6
5
13
4
3
2 IC01Y LA7222
16
1
IC21Y TDA9830 H L L H 6 5 4 3 2 1 1TU 12 11 9 8 7 10 12 11 H L 10 9 8 7 L 6 5 H 4 3 2 1
Z21Y L9453M
A/V SWITCHING BLOCK DIAGRAM
Q22Y
2TU
Q20Y
1TU
1TU
Q01Y
Q25Y
Q24Y
1 L/L IF1 GND GND BG/LL TU1(A-IN) AV2(A-IN) EXT A-OUT(VCD)
2
3
4
5
6
7
8
9 AV(AUDIO IC)
10 AV1(A-IN)
11 AV/TU2
12 PB(A-IN)
13 AV1(A-OUT)
14 EE/VV
15 TU2(A-OUT)
1 GND
2 TU1(V-IN)
3 AV1-OUT(V)
4 PB(V-IN)
5 GND
6 AV-OUT(V)
7 AV1(V-IN)
8 AV2(V-IN)
9 AV1/AV2
10 12V
11 YC-IN(V)
12 AV/TU1
13 TU1/TU2
14 VPS(V-IN)
15 GND
V H
VIDEO AUDIO
WAVE FORM
REC VIDEO REC AUDIO OSD R/G/B/FB SCART R/G/B/FB
AUDIO TEXT R/G/B/FBN WAVE FORM
3854VA0028A (980415)
PB-C PB-Y
REC-C REC-Y
3854VA0028A (980415)
SECAM LL' or PB Audio PB Audio
REC(Sub Tuner) Audio REC(Sub Tuner)