Aiwa VX-C131 Service Manual
VX-C131
U
SERVICE MANUAL
INTEGRATED COLOR TV / STEREO VIDEO
CASSETTE RECORDER
SPECIFICATIONS
GENERAL
POWER REQUIREMENTS.................
POWER CONSUMPTION...................
WEIGHT ..............................................
DIMENSIONS......................................
TV SECTION
PICTURE TUBE ..................................
TUNER SYSTEM ................................
CHANNEL COVERAGE......................
PROGRAM MEMORY.........................
TV SYSTEM ........................................
HORIZONTAL RESOLUTION ............
ANTENNA INPUT ...............................
VCR SECTION
OPERATING TEMPERATURE...........
VIDEO RECORDING SYSTEM ..........
120V AC, 60Hz
89W
TYP 4W (power save mode)
13.5 kg (29.8 lbs.)
435 mm (W) x 370.5 mm (D) x
384.5 mm (H)
(17 1/4 x 14 5/8 x
15 1/4 in.)
208 mm (W) x 211 mm (H)
(8 1/4 x 8 3/8 in.)
335 mm (diagonal) (13 in.)
Frequency synthesized tuner
VHF: 2 to 13
UHF: 14 to 69
CATV: 5A, A-1 to A-5, A to W,
W+1 to W+84
181
M
230 lines
75 ohms, unbalanced
5°C to 40°C
Rotary 2 head helical scanning
system
BASIC TAPE MECHANISM : OVD-6
VIDEO SIGNAL SYSTEM ................
VIDEO HEAD ...................................
USABLE CASSETTES.....................
TAPE SPEED ...................................
RECORDING/PLAYBACK TIME .....
VIDEO INPUT...................................
VIDEO OUTPUT ..............................
VIDEO S/N .......................................
AUDIO INPUT ..................................
AUDIO OUTPUT ..............................
AUDIO TRACK .................................
FAST-FORWARD TIME...................
REWIND TIME .................................
Design and specifications are subject to change without
•
notice.
NTSC color system, 525 lines, 60
fields
Azimuth 2 head
VHS video cassette
S-VHS video cassette (play back only)
SP: 33.35 mm/sec
LP: 16.67 mm/sec
SLP: 11.12 mm/sec
SP: 3 hours with T-180 tape
LP: 6 hours with T-180 tape
SLP: 9 hours with T-180 tape
1.0Vp-p, 75 ohm, unbalanced
1.0Vp-p, 75 ohm, unbalanced
53dB (nominal)
–8dBs, 50K ohm
–8dBs, less than 1K ohm
1 tracks (Normal sound)
Approx. 2 minutes 15 seconds
with T-120 tape
Approx. 1 minute 48 seconds
with T-120 tape
S/M Code No. 09-004-344-4N1
DATA
TABLE OF CONTENTS
SPECIFICATIONS..............................................................................................................................................................
TABLE OF CONTENTS .....................................................................................................................................................
SERVICING NOTICES ON CHECKING .............................................................................................................................
DISASSEMBLY INSTRUCTIONS
REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS ...........................................................................................
REMOVAL OF DECK PARTS..........................................................................................................................................
REMOVAL OF ANODE CAP............................................................................................................................................
KEY TO ABBREVIATIONS .................................................................................................................................................
SERVICE MODE LIST .......................................................................................................................................................
PREVENTIVE CHECKS AND SERVICE INTERVALS .......................................................................................................
NOTE FOR THE REPLACING OF MEMORY IC ................................................................................................................
SERVICING FIXTURES AND TOOLS ................................................................................................................................
PREPARATION FOR SERVICING .....................................................................................................................................
VCR TEST TAPE INTERCHANGEABILITY TABLE ...........................................................................................................
MECHANICAL ADJUSTMENTS
CONFIRMATION AND ADJUSTMENT............................................................................................................................
CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM ..................................................................
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE .............................................................................................
ELECTRICAL ADJUSTMENTS
ADJUSTMENT PROCEDURE .........................................................................................................................................
BASIC ADJUSTMENTS ...................................................................................................................................................
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE.............................................................................................
PURITY AND CONVERGENCE ADJUSTMENTS ..........................................................................................................
TROUBLESHOOTING GUIDES..........................................................................................................................................
IC DESCRIPTIONS ............................................................................................................................................................
SERVO TIMING CHART ....................................................................................................................................................
SYSTEM SWITCH MODE ...................................................................................................................................................
SEMICONDUCTOR BASE CONNECTIONS ......................................................................................................................
BLOCK DIAGRAMS
TV ....................................................................................................................................................................................
Y/C/AUDIO/HEAD AMP/IN/OUT ......................................................................................................................................
MICON/POWER/OPERATION.........................................................................................................................................
PRINTED CIRCUIT BOARDS (OPERATION/DECK) .........................................................................................................
OPERATION SCHEMATIC DIAGRAM ...............................................................................................................................
DECK SCHEMATIC DIAGRAM...........................................................................................................................................
PRINTED CIRCUIT BOARDS (SYSCON) ..........................................................................................................................
Y/C/AUDIO/HEAD AMP SCHEMATIC DIAGRAM ..............................................................................................................
MICON SCHEMATIC DIAGRAM.........................................................................................................................................
CHROMA/IF SCHEMATIC DIAGRAM ................................................................................................................................
IN/OUT SCHEMATIC DIAGRAM ........................................................................................................................................
POWER SCHEMATIC DIAGRAM .......................................................................................................................................
SOUND AMP SCHEMATIC DIAGRAM...............................................................................................................................
PRINTED CIRCUIT BOARDS (MAIN/CRT) ........................................................................................................................
DEFLECTION SCHEMATIC DIAGRAM..............................................................................................................................
TV POWER SCHEMATIC DIAGRAM .................................................................................................................................
CRT SCHEMATIC DIAGRAM .............................................................................................................................................
INTERCONNECTION DIAGRAM........................................................................................................................................
WAVEFORMS ....................................................................................................................................................................
MECHANICAL EXPLODED VIEW ......................................................................................................................................
MECHANICAL REPLACEMENT PARTS LIST ...................................................................................................................
ACCESSORY REPLACEMENT PARTS LIST ....................................................................................................................
CHASSIS EXPLODED VIEW (TOP VIEW).........................................................................................................................
CHASSIS EXPLODED VIEW (BOTTOM VIEW).................................................................................................................
CHASSIS REPLACEMENT PARTS LIST ...........................................................................................................................
ELECTRICAL REPLACEMENT PARTS LIST.....................................................................................................................
COVER
A1-1
A2-1
B1-1, B1-2
B2-1~B2-5
B3-1
C1-1, C1-2
C2-1
C3-1, C3-2
C4-1
C5-1
C5-2, C5-3
C6-1
D1-1, D1-2
D1-2, D1-3
D1-4
D2-1
D2-1~D2-4
D2-5, D2-6
D2-7
E-1~E-26
F1-1~F1-3
F2-1
F2-2
G-1
H-1
H-2
H-3
I-1
I-2
I-3
I-4~I-6
I-7
I-8
I-9
I-10
I-11
I-12
I-13
I-14
I-15
I-16
I-17
J-1~J-3
K1-1, K1-2
K1-3
K1-3
K2-1
K2-2
K2-3
K3-1~K3-4
A1-1
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES
As for the places which need special attentions, they are
indicated with the labels or seals on the cabinet, chassis
and parts. Make sure to keep the indications and notices
in the operation manual.
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an electric
shock while the electric current is flowing.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific
characters of incombustibility and withstand voltage for
safety. Therefore, the part which is replaced should be
used the part which has the same character.
Especially as to the important parts for safety which is
indicated in the circuit diagram or the table of parts as
a mark, the designated parts must be used.
4. PUT PARTS AND WIRES IN THE ORIGINAL
POSITION AFTER ASSEMBLING OR WIRING
There are parts which use the insulation material such
as a tube or tape for safety, or which are assembled in
the condition that these do not contact with the printed
board. The inside wiring is designed not to get closer to
the pyrogenic parts and high voltage parts. Therefore,
put these parts in the original positions.
5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE
In the condition that an explosion-proof cathode-ray
tube is set in this equipment, safety is secured against
implosion. However, when removing it or serving from
backward, it is dangerous to give a shock. Take
enough care to deal with it.
6. AVOID AN X-RAY
Safety is secured against an X-ray by considering about
the cathode-ray tube and the high voltage
peripheral circuit, etc.
Therefore, when repairing the high voltage peripheral
circuit, use the designated parts and make sure not
modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathode-ray tube.
PERFORM A SAFETY CHECK AFTER
7.
SERVICING
Confirm that the screws, parts and wiring which were
removed in order to service are put in the original
positions, or whether there are the
portions which are deteriorated around the serviced
places serviced or not. Check the insulation between the
antenna terminal or external metal and the AC cord plug
blades. And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
Unplug the plug from the AC outlet.
2.
Remove the antenna terminal on TV and turn on the
TV.
3.
Insulation resistance between the cord plug terminals
and the eternal exposure metal [Note 2] should be
more than 1M ohm by using the 500V insulation resistance meter [Note 1].
4.
If the insulation resistance is less than 1M ohm, the
inspection repair should be required.
[Note 1]
If you have not the 500V insulation resistance meter,
use a Tester.
[Note 2]
External exposure metal: Antenna terminal
Earphone jack
A2-1
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS
AND P.C. BOARDS
1-1: BACK CABINET (Refer to Fig. 1-1)
1.
Remove the 2 screws 1.
2.
Remove the 2 screws 2.
3.
Remove the 2 screws 3 which are used for holding the
Back Cabinet.
4.
Remove the AC cord from the AC cord hook 4.
5.
Remove the Back Cabinet in the direction of arrow.
Front Cabinet
1
1
2
3
3
2
4
1-2: CRT PCB (Refer to Fig. 1-2)
CAUTION: BEFORE REMOVING THE ANODE CAP,
DISCHARGE ELECTRICITY BECAUSE IT
CONTAINS HIGH VOLTAGE.
BEFORE ATTEMPTING TO REMOVE OR
REPAIR ANY PCB, UNPLUG THE POWER
CORD FROM THE AC SOURCE.
1.
Remove the Anode Cap.
(Refer to REMOVAL OF ANODE CAP)
2.
Disconnect the following connectors:
(CP801, CP802 and CP850).
3.
Remove the CRT PCB in the direction of arrow.
Back Cabinet
Fig. 1-1
1-3: TV/VCR BLOCK (Refer to Fig. 1-3)
1.
Remove the 2 screws 1.
2.
Disconnect the following connectors:
(CP351, CP352, CP353, CP354, CP401 and CP502).
3.
Unlock the support 2.
4.
Remove the TV/VCR Block in the direction of arrow.
1
Front Cabinet
1
2
UP TO
RELEASE
TV/VCR Block
1-4: MAIN PCB (Refer to Fig. 1-4)
1.
Remove the screw 1.
2.
Remove the Main PCB Holder.
3.
Remove the 2 screws 2.
4.
Remove the 3 screws 3.
5.
Disconnect the following connectors:
(CP810, CP820, CP811 and CP804).
6.
Remove the Main PCB in the direction of arrow.
2
2
3
Main PCB
Main PCB Holder
1
3
3
Fig. 1-3
Front Cabinet
CRT PCB
VCR Block
Fig. 1-4
Fig. 1-2
B1-1
DISASSEMBLY INSTRUCTIONS
1-5: DECK SHIELD PLATE (Refer to Fig. 1-5)
1.
Remove the 2 screws 1.
2.
Remove the screw 2.
3.
Remove the Deck Shield Plate in the direction of arrow.
Deck Shield Plate
2
1
1
VCR Block
1-6: DECK CHASSIS (Refer to Fig. 1-6)
1.
Remove the 3 screws 1.
2.
Disconnect the following connectors:
(CP1002, CP1005, CP1006, CP4001, CP4004 and
CP4005).
3.
Remove the Deck Chassis in the direction of arrow.
Fig. 1-5
1-7: JACK PLATE AND SYSCON PCB (Refer to Fig. 1-7)
1.
Remove the screw 1.
2.
Remove the Syscon PCB in the direction of arrow (A).
3.
Remove the screw 2.
4.
Remove the nut 3.
5.
Remove the washer 4.
6.
Unlock the 2 supports 5.
7.
Remove the Jack Plate in the direction of arrow (B).
Jack Plate
2
3
4
5
Syscon PCB
5
(B)
1
(A)
Deck Holder
Fig. 1-7
Syscon PCB
1
1
1
Deck Chassis
Fig. 1-6
B1-2
DISASSEMBLY INSTRUCTIONS
2. REMOVAL OF DECK PARTS
2-1: TOP BRACKET (Refer to Fig. 2-1)
Remove the 2 screws 1.
1.
Slide the 2 supports 2 and remove the Top Bracket.
2.
NOTE
When you install the Top Bracket, install the screw (1)
first, then install the screw (2).
(2)
1
Top Bracket
2
Main Chassis
• Screw Torque: 5 ± 0.5kgf•cm
Top Bracket
2
Main Chassis
2-2: FLAP LEVER/TAPE GUIDE R (Refer to Fig. 2-2)
Move the Cassette Holder Ass'y to the back side.
1.
Remove the Polyslider Washer 1.
2.
Remove the Flap Lever.
3.
Unlock the 3 supports 2 and remove the Tape Guide R.
4.
(1)
1
Fig. 2-1
NOTE
When you install the Tape Guide L, install as shown in the
circle of Fig. 2-3-B. (Refer to Fig. 2-3-B)
Tape Guide L
REC Lever
• The REC Lever is not installed on the Video Cassette Player.
Fig. 2-3-B
2-4: CASSETTE HOLDER ASS'Y (Refer to Fig. 2-4)
Move the Cassette Holder Ass'y to the front side.
1.
Push the Locker R to remove the Cassette Side R.
2.
Remove the Cassette Side L.
3.
Main Chassis
Cassette Side R
Locker R
Tape Guide R
Flap Lever
2
2
2
Main Chassis
Fig. 2-2
2-3: TAPE GUIDE L (Refer to Fig. 2-3-A)
Move the Cassette Holder Ass'y to the back side.
1.
Unlock the 2 supports 1 and remove the Tape Guide L.
2.
Remove the REC Lever. (Recorder only)
3.
REC Lever
Tape Guide L
1
Cassette Side L
Main Chassis
Fig. 2-4
2-5: CASSETTE SIDE L/R (Refer to Fig. 2-5)
Remove the Locker Spring.
1.
Unlock the 4 supports 1 and then remove the Cassette
2.
1
Side L/R.
NOTE
When you install the Cassette Side L/R, be sure to move
the Locker L/R after installing.
1
1
Locker Spring
Locker R
Cassette Side R
1
1
Locker L
Cassette Side L
Fig. 2-5
1
Main Chassis
• The REC Lever is not installed on the Video Cassette Player.
Fig. 2-3-A
B2-1
DISASSEMBLY INSTRUCTIONS
2-6: LINK ASS'Y (Refer to Fig. 2-6)
Set the Link Ass'y to the Eject position.
1.
Remove the (A) side of the Link Ass'y first, then remove
2.
the (B) side.
Link Ass'y
(A)
Main Chassis
(B)
Link Ass'y
Main Chassis
Fig. 2-6
2-7: LOADING MOTOR ASS'Y (Refer to Fig. 2-7)
Remove the Link Lever.
1.
Remove the Dumper Spring.
2.
Remove the 2 screws 1.
3.
Unlock the support 2 and remove the Loading Motor
4.
Ass'y.
Unlock the 2 supports 3 and remove the Deck PCB
5.
(BOT).
1
Dumper Spring
Loading Motor Ass'y
2
2-9: TENSION ASS'Y (Refer to Fig. 2-9-A)
Move the Inclined S Ass'y to the back side.
1.
Unlock the support 1 and remove the S Reel Stopper.
2.
Remove the Tension Spring.
3.
Unlock the support 2 and remove the Tension Arm
4.
Ass'y.
Remove the Tension Adjust.
5.
Unlock the 2 supports 3 and remove the Tension Band
6.
Ass'y.
Unlock the support 4 and remove the Tension Holder.
7.
Tension Adjust
3
3
Tension Spring
2
4
S Reel Stopper
1
Tension Band Ass'y
Tension Arm Ass'y
Tension Holder
Inclined S Ass'y
Fig. 2-9-A
NOTE
When you install the Tension Adjust, install as shown in
Fig. 2-9-B. (Refer to Fig. 2-9-B)
Adjust the direction of the Marker to inside.
3
Main Chassis
• Screw Torque: 5 ± 0.5kgf•cm
1
Deck PCB
(BOT)
Link Lever
2-8: SENSOR COVER L (Refer to Fig. 2-8)
Unlock the support 1 and remove the Sensor Cover L.
1.
Unlock the 2 supports 2 and remove the Deck PCB
2.
(EOT).
Main Chassis
Sensor Cover L
Deck PCB
(EOT)
1
2
2
Fig. 2-8
Fig. 2-7
2-10: T BRAKE ASS'Y (Refer to Fig. 2-10)
Remove the T Brake Spring.
1.
Remove the T Brake Ass'y.
2.
T Brake Ass'y
T Brake Spring
Fig. 2-9-B
Fig. 2-10
B2-2
DISASSEMBLY INSTRUCTIONS
2-11: S REEL/T REEL ASS'Y (Refer to Fig. 2-11)
Remove the Idler Ass'y.
1.
Remove the S Reel and T Reel Ass'y.
2.
Remove the 2 Polyslider Washers 1.
3.
NOTE
Take care not to damage the gears of the S Reel, T
1.
Reel Ass'y and Idler Ass'y.
The Polyslider Washer may be remained on the back of
2.
the reel.
Take care not to damage the shaft.
3.
Do not touch the section "A" of S Reel and T Reel Ass'y.
4.
(Use gloves.) (Refer to Fig. 2-11) Do not adhere the
stains on it.
When you install the reel, clean the shaft and oil it
5.
(KYODO OIL Slidas #150). (If you do not oil, noise may
be heard in FF/REW mode.)
After installing the reel, adjust the height of the reel.
6.
(Refer to MECHANICAL ADJUSTMENT)
S Reel
(A)
1
Idler Ass'y
T Reel Ass'y
(A)
1
Fig. 2-11
NOTE
Do not touch the Pinch Roller. (Use gloves.)
1.
When you install the Pinch Roller Ass'y, install as
2.
shown in the circle. (Refer to Fig. 2-12-B)
Fig. 2-12-B
2-13: A/C HEAD (Refer to Fig. 2-13-A)
Remove the screw 1.
1.
Remove the A/C Head Base.
2.
Remove the 3 screws 2.
3.
Remove the A/C Head and A/C Head Spring.
4.
NOTE
Do not touch the A/C Head. (Use gloves.)
1.
When you install the A/C Head Spring, install as shown
2.
in Fig. 2-13-B. (Refer to Fig. 2-13-B)
When you install the A/C Head, tighten the screw (1)
3.
first, then tighten the screw (2), finally tighten the screw
(3).
(3)
(1)
2
2
(2)
2
A/C Head
2-12: PINCH ROLLER ASS'Y/P5 ARM ASS'Y
(Refer to Fig. 2-12-A)
Remove the P5 Spring.
1.
Remove the screw 1.
2.
Unlock the 2 supports 2 and remove the Cassette
3.
Opener.
Remove the Pinch Roller Ass'y, Pinch Roller Lever and
4.
P5 Arm Ass'y.
1
P5 Spring
2
Cassette Opener
2
Pinch Roller Ass'y
P5 Arm Ass'y
Pinch Roller Lever
Main Chassis
A/C Head Spring
1
A/C Head Base
Fig. 2-13-A
Spring Position
Fig. 2-13-B
2-14: FE HEAD (RECORDER ONLY) (Refer to Fig. 2-14)
Remove the screw 1.
1.
Remove the FE Head.
2.
FE Head
1
• Screw Torque: 5 ± 0.5kgf•cm
Fig. 2-12-A
B2-3
• The FE Head is not installed on the Video Cassette Player.
Fig. 2-14
DISASSEMBLY INSTRUCTIONS
2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y
(Refer to Fig. 2-15)
Unlock the support 1 and remove the AHC Ass'y.
1.
Remove the 3 screws 2.
2.
Remove the Cylinder Unit Ass'y.
3.
NOTE
When you install the Cylinder Unit Ass'y, tighten the
screws from (1) to (3) in order while pulling the Ass'y
toward the left front direction.
2
Cylinder Unit Ass'y
2
(2)
(3)
2
(1)
AHC Ass'y
1
1
Middle Gear
E-Ring
Main Cam
2
Pinch Roller Cam
Link Lever Spacer
3
Joint Gear
P5 Cam
Fig. 2-17-A
NOTE
When you install the Pinch Roller Cam, P5 Cam and Main
Cam, align each marker. (Refer to Fig. 2-17-B)
Pinch Roller Cam
Check the hole of Main
Chassis can be seen.
P5 Cam
• Screw Torque: 5 ± 0.5kgf•cm
Fig. 2-15
2-16: CAPSTAN DD UNIT (Refer to Fig. 2-16)
Remove the Capstan Belt.
1.
Remove the 3 screws 1.
2.
Remove the Capstan DD Unit.
3.
Capstan Belt
Capstan DD Unit
1
1
1
• Screw Torque: 5 ± 0.5kgf•cm
Fig. 2-16
2-17: MIDDLE GEAR/MAIN CAM (Refer to Fig. 2-17-A)
Remove the Polyslider Washer 1, then remove the
1.
Middle Gear.
Remove the E-Ring, then remove the Main Cam, Link
2.
Lever Spacer and P5 Cam.
Remove the Polyslider Washer 2, then remove the
3.
Pinch Roller Cam.
Remove the Polyslider Washer 3, then remove the
4.
Joint Gear.
Main Cam
Marker
Fig. 2-17-B
2-18: CLUTCH ASS'Y (Refer to Fig. 2-18)
Remove the Polyslider Washer 1.
1.
Remove the Clutch Ass'y, Ring Spring, Ring Clutch,
2.
Gear Clutch and Polyslider Washer 2.
NOTE
When you install the Clutch Ass'y, oil the shaft (KYODO
OIL Slidas #150).
1
Clutch Ass'y
Ring Spring
Ring Clutch
Gear Clutch
2
App. 5mm
B2-4
Fig. 2-18
DISASSEMBLY INSTRUCTIONS
2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A)
Remove the E-Ring 1 and remove the Main Loading
1.
Gear.
Remove the Capstan Brake Spring.
2.
Slide the Main Rod and remove the Capstan Brake
3.
Arm Ass'y.
Remove the Main Rod.
4.
Remove the Tension Lever.
5.
Unlock the 2 supports 2 and remove the Clutch Lever.
6.
Remove the screw 3.
7.
Remove the LED Reflector.
8.
Remove the Loading Arm S Ass'y and Loading Arm T
9.
Ass'y.
Remove the Loading Gear S and Loading Gear T.
10.
Remove the Loading Gear Spring.
11.
Capstan Brake Spring
Main Rod
Clutch Lever
Capstan Brake Arm Ass'y
1
Main Loading Gear
Tension Lever
Loading Gear T
2-20: INCLINED S/T ASS'Y (Refer to Fig. 2-20)
Unlock the support 1 and remove the P4 Cover.
1.
Remove the S-S Brake Spring.
2.
Unlock the support 2 and remove the Loading Gear
3.
Holder.
Remove the S-S Brake Arm.
4.
Remove the Inclined S.
5.
Remove the Inclined T.
6.
Remove the 2 screws 3, then remove the Guide Roller.
7.
NOTE
Do not touch the roller of Guide Roller.
Loading Gear Holder
Guide Roller
Inclined S
3
2
S-S Brake Spring
S-S Brake Arm
Guide Roller
3
Inclined T
1
P4 Cover
2
LED Reflector
3
2
Loading Gear
Spring
Loading Arm T Ass'y
Loading Gear S
Loading Gear
Spring
Loading Arm S Ass'y
Fig. 2-19-A
NOTE
When you install the Loading Arm S Ass'y, Loading Arm T
Ass'y and Main Loading Gear, align each marker. (Refer
to Fig. 2-19-B)
Marker
Main Loading Gear
Marker
• Screw Torque: 0.7 ± 0.2kgf•cm
Fig. 2-20
Loading Arm T Ass'y
Loading Arm S Ass'y
Fig. 2-19-B
B2-5
DISASSEMBLY INSTRUCTIONS
3. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work.
*
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.
*
Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 3-1.)
Connect one end of an Alligator Clip to the metal part of a
flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated Screwdriver,
touch the support of the Anode with the tip of the
Screwdriver.
A cracking noise will be heard as the voltage is discharged.
GND on the CRT
3. After one side is removed, pull in the opposite direction to
remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 3-3.)
Location of Anode Cap
Fig. 3-3
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.3.Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 3-4.)
Screwdriver
Alligator Clip
GND on the CRT
Flip up the sides of the Rubber Cap in the direction of the
2.
arrow and remove one side of the support.
(Refer to Fig. 3-2.)
Rubber Cap
CRT
Support
Support
CRT
Fig. 3-1
Fig. 3-2
Fig. 3-4
4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 3-5.
Support
CRT
5.6.Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
Fig. 3-5
B3-1
A
A/C
ACC
AE
AFC
AFT
AFT DET
AGC
AMP
ANT
A.PB
APC
ASS'Y
AT
AUTO
A/V
B
BGP
BOT
BPF
BRAKE SOL
BUFF
B/W
C
C
CASE
CAP
CARR
CH
CLK
CLOCK (SY-SE)
COMB
CONV
CPM
CTL
CYL
CYL-M
CYL SENS
D
DATA (SY-CE)
dB
DC
DD Unit
DEMOD
DET
DEV
E
E
EF
EMPH
ENC
ENV
EOT
EQ
EXT
F
F
FBC
FE
FF
FG
FL SW
FM
FSC
FWD
G
GEN
GND
H
H.P.F
KEY TO ABBREVIATIONS
:
Audio/Control
:
Automatic Color Control
:
Audio Erase
:
Automatic Frequency Control
:
Automatic Fine Tuning
:
Automatic Fine Tuning Detect
:
Automatic Gain Control
:
Amplifier
:
Antenna
:
Audio Playback
:
Automatic Phase Control
:
Assembly
:
All Time
:
Automatic
:
Audio/Video
:
Burst Gate Pulse
:
Beginning of Tape
:
Bandpass Filter
:
Brake Solenoid
:
Buffer
:
Black and White
:
Capacitance, Collector
:
Cassette
:
Capstan
:
Carrier
:
Channel
:
Clock
:
Clock (Syscon to Servo)
:
Combination, Comb Filter
:
Converter
:
Capstan Motor
:
Control
:
Cylinder
:
Cylinder-Motor
:
Cylinder-Sensor
:
Data (Syscon to Servo)
:
Decibel
:
Direct Current
:
Direct Drive Motor Unit
:
Demodulator
:
Detector
:
Deviation
:
Emitter
:
Emitter Follower
:
Emphasis
:
Encoder
:
Envelope
:
End of Tape
:
Equalizer
:
External
:
Fuse
:
Feed Back Clamp
:
Full Erase
:
Fast Forward, Flipflop
:
Frequency Generator
:
Front Loading Switch
:
Frequency Modulation
:
Frequency Sub Carrier
:
Forward
:
Generator
:
Ground
:
High Pass Filter
H.SW
Hz
I
IC
IF
IND
INV
K
KIL
L
L
LED
LIMIT AMP
LM, LDM
LP
L.P.F
LUMI.
M
M
MAX
MINI
MIX
MM
MOD
MPX
MS SW
N
NC
NR
O
OSC
OPE
P
PB
PB CTL
PB-C
PB-Y
PCB
P. CON
PD
PG
P-P
R
R
REC
REC-C
REC-Y
REEL BRK
REEL S
REF
REG
REW
REV, RVS
RF
RMC
RY
S
S. CLK
S. COM
S. DATA
SEG
SEL
SENS
SER
SI
SIF
SO
SOL
SP
STB
SW
:
Head Switch
:
Hertz
:
Integrated Circuit
:
Intermediate Frequency
:
Indicator
:
Inverter
:
Killer
:
Left
:
Light Emitting Diode
:
Limiter Amplifier
:
Loading Motor
:
Long Play
:
Low Pass Filter
:
Luminance
:
Motor
:
Maximum
:
Minimum
:
Mixer, mixing
:
Monostable Multivibrator
:
Modulator, Modulation
:
Multiplexer, Multiplex
:
Mecha State Switch
:
Non Connection
:
Noise Reduction
:
Oscillator
:
Operation
:
Playback
:
Playback Control
:
Playback-Chrominance
:
Playback-Luminance
:
Printed Circuit Board
:
Power Control
:
Phase Detector
:
Pulse Generator
:
Peak-to Peak
:
Right
:
Recording
:
Recording-Chrominance
:
Recording-Luminance
:
Reel Brake
:
Reel Sensor
:
Reference
:
Regulated, Regulator
:
Rewind
:
Reverse
:
Radio Frequency
:
Remote Control
:
Relay
:
Serial Clock
:
Sensor Common
:
Serial Data
:
Segment
:
Select, Selector
:
Sensor
:
Search Mode
:
Serial Input
:
Sound Intermediate Frequency
:
Serial Output
:
Solenoid
:
Standard Play
:
Serial Strobe
:
Switch
C1-1
S
SYNC
SYNC SEP
T
TR
TRAC
TRICK PB
TP
U
UNREG
V
V
VCO
VIF
VP
V.PB
VR
V.REC
VSF
VSR
VSS
V-SYNC
VT
X
X'TAL
Y
Y/C
KEY TO ABBREVIATIONS
:
Synchronization
:
Sync Separator, Separation
:
Transistor
:
Tracking
:
Trick Playback
:
Test Point
:
Unregulated
:
Volt
:
Voltage Controlled Oscillator
:
Video Intermediate Frequency
:
Vertical Pulse, Voltage Display
:
Video Playback
:
Variable Resistor
:
Video Recording
:
Visual Search Fast Forward
:
Visual Search Rewind
:
Voltage Super Source
:
Vertical-Synchronization
:
Voltage Tuning
:
Crystal
:
Luminance/Chrominance
C1-2
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter SERVICE MODE, Unplug AC cord till lost actual clock time. Then press and hold Vol (-) button of main unit and
remocon key simultaneously.
The both pressing of set key and remote control key will not be possible if clock has been set. To reset clock, either unplug
AC cord and allow at least 5 seconds before Power On.
Set Key Remocon Key Operations
VOL. (-) MIN
VOL. (-) MIN 1
VOL. (-) MIN
VOL. (-) MIN
VOL. (-) MIN 4
VOL. (-) MIN
VOL. (-) MIN
0
2
3
5
6
Releasing of V-CHIP PASSWORD.
Initialization of the factory.
NOTE: Do not use this for the normal servicing.
Horizontal position adjustment of OSD.
NOTE: Also can be adjusted by using the Adjustment MENU.
Refer to the "ELECTRICAL ADJUSTMENT" (OSD HORIZONTAL).
Adjust the PG SHIFTER automatically.
Refer to the "ELECTRICAL ADJUSTMENT" (PG SHIFTER).
Adjust the PG SHIFTER manually.
Refer to the "ELECTRICAL ADJUSTMENT" (PG SHIFTER).
Adjusting of the Tracking to the center position.
NOTE: Also can be adjusted by pressing the ATR button for more tan 2 seconds
during PLAY.
POWER ON total hours and PLAY/REC total hours are displayed on the screen.
Refer to the "PREVENTIVE CHECKS AND SERVICE INTERVALS" (CONFIRMATION
OF USING HOURS).
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "NOTE FOR THE REPLACING OF MEMORY IC".
VOL. (-) MIN 8
VOL. (-) MIN 9
Method Operations
Press the ATR button on the
remote control for more than
2 seconds during PLAY.
Make the short circuit between
the test point of SERVICE and
the GND.
Writing of EEPROM initial data.
NOTE: Do not use this for the normal servicing.
Display of the Adjustment MENU on the screen.
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
Adjusting of the Tracking to the center position.
Refer to the "MECHANICAL ADJUSTMENT" (GUIDE ROLLER) and "ELECTRICAL
ADJUSTMENT" (PG SHIFTER).
The EOT/BOT/Reel sensor do not work at this moment.
Refer to the "PREPARATION FOR SERVICING"
C2-1
PREVENTIVE CHECKS AND SERVICE INTERV ALS
The following standard table depends on environmental conditions and usage. Unless maintenance is properly
carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts.
Also, long term storage or misuse may cause transformation and aging of rubber parts.
Time
Parts Name
Audio Control Head
Full Erase Head
(Recorder only)
Capstan Belt
Pinch Roller
Capstan DD Unit
Loading Motor
Tension Band
Capstan Shaft
Tape Running
Guide Post
Cylinder Unit
: Clean
: Replace
500
hours
1,000
hours
1,500
hours
2,000
hours
3,000
hours
Notes
Clean those parts in
contact with the tape.
Clean the rubber, and parts
which the rubber touches.
Replace when rolling
becomes abnormal.
Clean the Head
CONFIRMATION OF USING HOURS
POWER ON total hours and PLAY/REC total hours can be checked on the screen.
Total hours are displayed in 16 system of notation.
NOTE: The confirmation of using hours will not be possible if clock has been set. To reset clock, either unplug
AC cord and allow at least 5 seconds before Power On.
1.
Set the VOLUME to minimum.
2.
While holding down VOLUME button on front cabinet, press key 6 on remote control simultaneously.
3.
After the confirmation of using hours, turn off the power.
INIT 00 83
POWER ON
PLAY/REC
(16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)
0010
0003
Initial setting content of MEMORY IC.
POWER ON total hours.
PLAY/REC total hours.
C3-1
PREVENTIVE CHECKS AND SERVICE INTERV ALS
CLEANING
NOTE
After cleaning the heads with isopropyl alcohol, do not
run a tape until the heads dry completely. If the heads
are not completely dry and alcohol gets on the tape,
damage may occur.
1. AUDIO CONTROL HEAD
Wrap a piece of chamois around your finger. Dip it in
isopropyl alcohol and clean the audio control head by
wiping it horizontally. Clean the full erase head in the
same manner. (Refer to the figure below.)
2. TAPE RUNNING SYSTEM
When cleaning the tape transport system, use the
gauze moistened with isopropyl alcohol.
3. CYLINDER
Wrap a piece of chamois around your finger. Dip it in
isopropyl alcohol. Hold it to the cylinder head softly.
Turn the cylinder head counterclockwise to clean it (in
the direction of the arrow). (Refer to the figure below.)
NOTE
Do not exert force against the cylinder head. Do not move
the chamois upward or downward on the head.
Use the chamois one by one.
Audio Control Head
Cylinder Head
C3-2
NOTE FOR THE REPLACING OF MEMORY IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.
NOTE: Initial Data setting will not be possible if clock has been set. To reset clock, either unplug AC cord and allow
at least 5 seconds before Power On.
ADDRESS DATA
00 81
01 6D
02 07
03 00
04 00
05 00
06 A4
07 CB
08 39
09 16
ADDRESS DATA
0A 2B
0B 24
0C CB
0D 01
0E 04
0F 05
10 6C
11 2B
12 21
13 15
ADDRESS DATA
14 90
15 A0
16 6D
17 54
18 B9
19 0C
1A 08
1B 82
1C 6B
1D FA
ADDRESS DATA
1E 43
1F 13
20 7D
21 0A
22 3E
23 00
24 39
25 00
26 00
27 3A
ADDRESS DATA
Table 1
Enter DATA SET mode by setting VOLUME to minimum.
1.
While holding down VOLUME button on front cabinet, press key 6 on remote control simultaneously.
2.
ADDRESS and DATA should appear as FIG 1.
3.
ADDRESS DATA
INIT 00 83
POWER ON
PLAY/REC
0010
0003
28 39
29
02
Fig. 1
ADDRESS is now selected and should "blink". Using the SET + or - keys on the remote, step through the ADDRESS until
4.
required ADDRESS to be changed is reached.
Press ENTER to select DATA. When DATA is selected, it will "blink".
5.
Again, step through the DATA using SET + or - until required DATA value has been selected.
6.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
7.
Repeat steps 4 to 7 until all data has been checked.
8.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
9.
The unit will now have the correct DATA for the new MEMORY IC.
C4-1
SERVICING FIXTURES AND TOOLS
(For 2 heads model)
VHS Alignment Tape
JG001
JG001A
JG001T
(TTV-N2)
(TTV-N12)
2
(VN S-X6 )
3 3
Screwdriver
JG154 Cable
Parts No. SJ-G15-400-000
(For 4 heads model)
VHS Alignment Tape
JG001B
JG001I
JG001S
JG162C Cable (10 Pins)
Parts No. SJ-G16-2C0-000
JG162D Cable (11 Pins)
Parts No. SJ-G16-2D0-000
JG162Y Cable (5 Pins)
Parts No. SJ-G16-2Y0-000
(TTV-N2)
(TTV-N12)
1
(VN S-X6 )
JG002B
JG002E
Adapter
Dial Torque Gauge
(10~90gf•cm)
JG002F
JG024AJG022 Master PlaneJG153 X Value Adjustment
(60~600gf•cm)
Reel Disk Height
Adjustment Jig
Tentelometer
JG005 Post Adjustment
Screwdriver
Part No. SV-TG0-030-000
(small)
JG100A Torque Tape
(VHT-063)
Part No. Remarks
JG001
JG001A
Stair Steps, 7KHz (For 2 heads model)
Color Bar, 1KHz (For 2 heads model)
JG001T X Value Adjustment (For 2 heads model)
JG001B
JG001I
Stair Steps, 7KHz (For 4 heads model)
Color Bar, 1KHz (For 4 heads model)
JG001S X Value Adjustment (For 4 heads model)
JG002B VSR Torque, Brake Torque (S Reel/T Reel Ass'y)
JG002E Brake Torque (T Reel Ass'y)
JG002F
JG005
JG153
JG022/JG024A
VSR Torque, Brake Torque (S Reel)
Guide Roller Adjustment
X Value Adjustment
Reel Disk Height Adjustment
JG100A Playback Torque, Back Tension Torque During Playback
JG154
Used to connect the test point of SERVICE and GROUND
JG162C/JG162D Used to connect the Syscon PCB and Main PCB
Used to connect the Syscon PCB and CRT PCBJG162Y
C5-1
PREPARA TION FOR SERVICING
Basic Servicing Position (In case of needing to check on all blocks)
1.
Unplug the connector CP351, CP352, CP353 and CP354, then remove the TV/VCR Block from the set.
2.
Unplug the connector CP810, CP820 and CP850, then remove the Main PCB from the VCR Block.
3.
Connect as shown in the below figure using the Service Fixture.
• Connect the Syscon PCB to the Main PCB with the cable JG162C and JG162D.
• Connect the Syscon PCB to the CRT PCB with the cable JG162Y.
4.
Remove the Operation PCB from the set, then connect it with the Syscon PCB.
If necessary, connect CP351. (Front A/V Jack Input Terminal)
5.
Short circuit between TP1001 and GND with the cable JG154.
(The EOT, BOT and Reel Sensor do not work at this moment.)
6.
At that time, the STOP/EJECT button is available to insert and eject the Cassette Tape.
Front Cabinet
To Ground
JG154
TP1001
Syscon PCB
CD850
CRT PCB
CP850
Main PCB
JG162Y
CP354
Operation PCB
CP820
CP810
JG162D
JG162C
CD820
CD810
CD750
C5-2
PREPARA TION FOR SERVICING
Servicing Position for Main PCB (In case of needing to check on Main PCB)
• It's possible to get the Servicing Position without the extension Jig if you arrange the unit as shown below.
(But L503 connection can not be done, Degauss circuit will not operate.)
L503 (2 Pin)
• Be careful for the short circuit.
Main PCB
VHS Tape
(Put the Tape under the FBT.)
C5-3
VCR TEST TAPE INTERCHANGEABILITY TABLE
There are two types of the new alignment tape CH-1B (for NTSC) and CH-2 (for PAL). On each tape four signals (1) - (4) are
recorded for the times and in the order shown below.
(1) : 8min. ---> (2) : 2min. ---> (3) : 5min. ---> (4) : 5min.
The TTV-MP1 (for M-PAL), TTV-MS1 (for MESECAM) and TTV-S1 (for SECAM) alignment tapes have the same contents as
the previous tapes.
Method
NTSC
Now in use TYPE
Model Model Contents*1
TTV-N1
TTV-N1E
TTV-N2
TTV-N12
(SCV-1998)
TTV-N7A
Contents*1
NTSC, Color,
1kHz, SP
NTSC, Color,
1kHz, EP
NTSC, Stairsteps,
7kHz, SP
NTSC, Color,
1kHz, SP
NTSC, Stairsteps,
1kHz, SP, HiFi
400Hz
CH-1B(2)
CH-1B(4)
CH-1B(1)
CH-1B(4)
CH-1B(3)
New TYPE
NTSC, Stairsteps,
1kHz, SP
NTSC, Color,
*2
1kHz, EP
NTSC, Stairsteps,
7kHz, SP
NTSC, Color, No
sound SP, HiFi
400Hz
NTSC, Color,
1kHz, EP
Application
PB-Y Level/General electrical ADJ.
Head ACE Height/Tilt ADJ.
Switching position ADJ.
Head ACE Azimuth ADJ.
FM envelope ADJ.
X-Value ADJ.
HiFi Audio PB Level ADJ.
TTV-P1
TTV-P1L
PAL
TTV-P2
TTV-P7
TTV-P16
*1. Described in the order of color format. Video signal. Linear audio. Tape speed and Hi-Fi audio.
*2. Use CH-1B (1) - (3) with models used exclusively in the SP mode.
*3. Use CH-2 (3) and (4) when it is necessary to observe the chroma signal.
PAL, Color,
1kHz, SP
PAL, Color,
1kHz, LP
PAL, Stairsteps,
6kHz, SP
PAL, Stairsteps,
1kHZ, SP, HiFi,
1kHz
PAL, Color, 400Hz,
SP, HiFi 1kHz
CH-2(2)
*3
CH-2(4)
CH-2(1)
CH-2(3)
PAL, Stairsteps,
1kHz, SP
PAL, Color,
1kHz, LP
PAL, Stairsteps,
6kHz, SP
PAL, Color, No
sound SP, HiFi
400Hz
No Changed.
Switching position ADJ.
PB-Y Level/General electrical ADJ.
Head ACE Height/Tilt ADJ.
Switching position. (LP Model)
FM Envelope ADJ. (LP Model)
X-Value ADJ. (LP Model)
Head ACE Azimuth ADJ.
FM Envelope ADJ. (SP Model)
X-Value ADJ. (SP Model)
HiFi Audio PB Level ADJ.
FM Filter ADJ.
C6-1
MECHANICAL ADJUSTMENTS
1. CONFIRMATION AND ADJUSTMENT
Read the following NOTES before starting work.
••Place an object which weighs between 450g~500g on
the Cassette Tape to keep it steady when you want to
make the tape run without the Cassette Holder. (Do not
place an object which weighs over 500g.)
When you activate the deck without the Cassette
Holder, short circuit between TP1001 and GND. (Refer
to ELECTRICAL ADJUSTMENT PARTS LOCATION
GUIDE) In this condition the BOT/EOT/Reel Sensor will
not function.
CONFIRMATION AND ADJUSTMENT OF REEL
1-1:
DISK HEIGHT
1.
Turn on the power and set to the STOP mode.
2.
Set the master plane (JG022) and reel disk height
adjustment jig (JG024A) on the mechanism framework,
taking care not to scratch the drum, as shown in Fig. 1-
1-A.
3.
Confirm that "A" of the reel disk is lower than "B" of the
reel disk height adjustment jig (JG024A) , and is higher
than "C". If it is not enough height, adjust to 10(+0.2, -0)
mm with the height adjustment washer.
4.
Adjust the other reel in the same way.
Master Plane (JG022)
1-2: CONFIRMATION AND ADJUSTMENT OF TENSION
POST POSITION
1.
Set to the PLAY mode.
2.
Adjust the Tension Adjust until the edge of the Tension
Arm is positioning within 0.5mm range from the
standard line center of Main Chassis.
After this adjustment, confirm that the cut position is
located in "A" area as shown in Fig. 1-2-B. If it is
located in "B" area, adjust again.
3.
While turning the S Reel clockwise, confirm that the
edge of the Tension Arm is located in the position
described above.
Standard line of Main Chassis
Tension Arm
0.5mm (Adjusting range)
Standard line center of Main Chassis
Tension Adjust
Fig. 1-2-A
Master Plane (JG022)
10(+0.2, -0)mm
Reel Disk Height Adjustment Jig
(JG024A)
Reel Disk
Height Adjustment
Washer
2.6x4.7xT0.13
2.6X4.7xT0.25
Reel Disk Height
Adjustment Jig
(JG024A)
(B)
(A)
Fig. 1-1-A
(C)
Fig. 1-1-B
(A)
Cut Position
(B)
Tension Adjust
Fig. 1-2-B
1-3: CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK
Load a video tape (T-120) recorded in standard speed
1.
mode. Set the unit to the PLAY mode.
Install the tentelometer as shown in Fig. 1-3. Confirm that
2.
the meter indicates 20 ± 2gf in the beginning of playback.
• USING A CASSETTE TYPE TORQUE TAPE (JG100A)
1.
After confirmation and adjustment of Tension Post
position (Refer to item 1-2), load the cassette type
torque tape (JG100A) and set to the PLAY mode.
2.
Confirm that the right meter of the torque tape indicates
70~110gf•cm during playback in SP mode.
3.
Confirm that the left meter of the torque tape indicates
25~40gf•cm during playback in SP mode.
Tentelometer
Video Tape
D1-1
P1 Post
Guide Roller
Fig. 1-3
MECHANICAL ADJUSTMENTS
1-4: CONFIRMATION OF VSR TORQUE
Operate within 4~5 seconds after the reel disk begins to
1.
turn.
Install the Torque Gauge (JG002F) and Adapter (JG002B)
2.
on the S Reel. Set to the Rewind mode. (Refer to Fig.1-4)
Then, confirm that it indicates 120~180gf•cm.
3.
NOTE
Install the Torque Gauge on the reel disk firmly. Press the
REW button to turn the reel disk.
1-5: CONFIRMATION OF REEL BRAKE TORQUE
(S Reel Brake) (Refer to Fig. 1-4)
Set to the STOP mode.
1.
Move the Idler Ass'y from the S Reel.
2.
Install the Torque Gauge (JG002F) and Adapter
3.
(JG002B) on the S Reel. Turn the Torque Gauge
(JG002F) clockwise.
Then, confirm that it indicates 70~100gf•cm.
4.
(T Reel Brake) (Refer to Fig. 1-4)
Set to the STOP mode.
1.
Move the Idler Ass'y from the T Reel Ass'y.
2.
Install the Torque Gauge (JG002E) and Adapter
3.
(JG002B) on the T reel. Turn the Torque Gauge
(JG002E) counterclockwise.
Then, confirm that it indicates 35~60gf•cm.
4.
Torque Gauge/Adapter
(JG002F/JG002B)
2. CONFIRMATION AND ADJUSTMENT
OF TAPE RUNNING MECHANISM
Tape Running Mechanism is adjusted precisely at the
factory. Adjustment is not necessary as usual. When you
replace the parts of the tape running mechanism because
of long term usage or failure, the confirmation and
adjustment are necessary.
2-1: GUIDE ROLLER
Playback the VHS Alignment Tape (JG001 or JG001B).
1.
(Refer to SERVICING FIXTURE AND TOOLS)
Connect CH-1 of the oscilloscope to TP4001 (Envelope)
2.
and CH-2 to TP1002 (SW Pulse).
Press and hold the TRACKING-AUTO button on the
3.
remote control more than 2 seconds to set tracking to
center.
Trigger with SW Pulse and observe the envelope. (Refer
4.
to Fig. 2-1-A)
When observing the envelope, adjust the Adjusting
5.
Driver (JG005) slightly until the envelope will be flat.
Even if you press the Tracking Button, adjust so that
flatness is not moved so much.
Adjust so that the A : B ratio is better than 3 : 2 as shown
6.
in Fig. 2-1-B, even if you press the Tracking Button to
move the envelope (The envelope waveform will begins
to decrease when you press the Tracking Button).
Adjust the PG shifter during playback.
7.
(Refer to the ELECTRICAL ADJUSTMENTS)
NOTE
After adjustment, confirm and adjust A/C head.
(Refer to item 2-2)
Torque Gauge/Adapter
(JG002E/JG002B)
S Reel
T Reel Ass'y
Fig. 1-4
NOTE
If the torque is out of the range, replace the following
parts.
Check item
1-4
1-5
Replacement Part
Idler Ass'y/Clutch Ass'y
T Brake Spring/Tension Spring
Envelope
CH-3
Audio
Max
CH-1
Envelope
(TP4001)
CH-1
CH-2
Track
Track
CH-2
SW Pulse (TP1002)
(1)
(2)
Entrance Exit
A
B
Fig. 2-1-A
Max
D1-2
A : B = 3 : 2
Fig. 2-1-B
MECHANICAL ADJUSTMENTS
CONFIRMATION AND ADJUSTMENT OF AUDIO/
CONTROL HEAD
When the Tape Running Mechanism does not work well,
adjust the following items.
1.
Playback the VHS Alignment Tape (JG001 or JG001B).
(Refer to SERVICING FIXTURE AND TOOLS)
2.
Confirm that the reflected picture of stamp mark is
appeared on the tape prior to P4 Post as shown in Fig.
2-2-A.
a)
When the reflected picture is distorted, turn the screw
1 clockwise until the distortion is disappeared.
b)
When the reflected picture is not distorted, turn the
screw 1 counterclockwise until little distortion is
appeared, then adjust the a).
3.
Turn the screw 2 to set the audio level to maximum.
4.
Confirm that the bottom of the Audio/ Control Head and
the bottom of the tape is shown in Fig. 2-2-C.
c)
When the height is not correct, turn the screw 3 to
adjust the height. Then, adjust the 1~3 again.
Audio/Control Head
Reflected picture of
Stamp Mark
P4 Post
2-3:2-2:
TAPE RUNNING ADJUSTMENT
(X VALUE ADJUSTMENT)
Confirm and adjust the height of the Reel Disk.
1.
(Refer to item 1-1)
Confirm and adjust the position of the Tension Post.
2.
(Refer to item 1-2)
Adjust the Guide Roller. (Refer to item 2-1)
3.
Confirm and adjust the Audio/Control Head.
4.
(Refer to item 2-2)
Connect CH-1 of the oscilloscope to TP4001, CH-2 to
5.
TP1002 and CH-3 to HOT side of Audio Out Jack.
Playback the VHS Alignment Tape (JG001S or JG001T).
6.
(Refer to SERVICING FIXTURE AND TOOLS)
Press and hold the TRACKING-AUTO button on the
7.
remote control more than 2 seconds to set tracking to
center.
Set the X Value adjustment driver (JG153) to the 4 of
8.
Fig. 2-2-B. Adjust X value so that the envelope waveform
output becomes maximum. Check if the relation between
Audio and Envelope waveform becomes (1) or (2) of Fig.
2-1-A.
3
2
Audio/Control Head
Tape
Stamp Mark
Audio/Control Head
Fig. 2-2-A
1
4
Fig. 2-2-B
0.25±0.05mm
Fig. 2-2-C
D1-3
MECHANICAL ADJUSTMENTS
3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE
4
3
2
5
6
7
1
8
11
1. Tension Adjust
2. Tension Arm
3. Guide Roller
4. P1 Post
5. Audio/Control Head
6. X value adjustment driver hole
1012
10.
11.
12.
9
7.
P4 Post
8.
T Brake Spring
9.
T Reel Ass'y
Idler Ass'y
S-S Brake Spring
S Reel
D1-4
ELECTRICAL ADJUSTMENTS
1. ADJUSTMENT PROCEDURE
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
When replacing IC's or transistors, use only specified
silicon grease (G746).
(To prevent the damage to IC's and transistors.)
On-Screen Display Adjustment
1.2.Unplug the AC plug for more than 5 seconds to set the
clock to the non-setting state. Then, set the volume
level to minimum.
Press the VOL. DOWN button on the set and the
channel button (9) on the remote control
simultaneously to display adjustment mode on the
screen as shown in Fig. 1-1.
NOTE
Use the channel buttons (1-8) on the remote control to
select the options shown in Fig. 1-1.
Press the channel button (0) on the remote control to
end the adjustments.
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7. STEREO/SAP
8. (VOL TEST) 0. END
"The adjustment items 3, 6, 7 and 8 are not used for
this model."
2. BASIC ADJUSTMENTS
(VCR SECTION)
2-1: PG SHIFTER
1.
Connect CH-1 on the oscilloscope to TP1002 and CH-2
to TP4201.
2.
Playback the alignment tape. (JG001I)
3.
Press and hold the Tracking-Auto button on the remote
control more than 2 seconds to set tracking to center.
4.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears. If the indicator REC
disappears, adjustment is completed.
(If the above adjustments doesn't work well:)
5.
Press the VOL. DOWN button on the set and the
channel button (3) on the remote control simultaneously
until the indicator REC disappears.
6.
When the REC indicator is blinking, press both VOL.
DOWN button on the set and the channel button (4) on
the remote control simultaneously and adjust the
Tracking +/- button until the arising to the down of Head
Switching Pulse becomes 6.5 ± 0.5H.
(Refer to Fig. 2-1-A, B)
7.
Press the Tracking Auto button.
Fig. 1-1
CH-2
6.5H
CH-1
Fig. 2-1-A
CH-2
CH-1
6.5H
Fig. 2-1-B
2-2: VCO FREERUN
1.
Place the set with Aging Test for more than 15 minutes.
2.
Receive the VHF HIGH.
3.
Disconnect the Antenna while receiving the VHF HIGH
and set to the Noise screen.
4.
Once turn off the Power and turn on the Power again.
5.
Approxi. 3 seconds later, input the Antenna again.
6.
Connect the digital voltmeter to TP601.
7.
Adjust the L610 until the digital voltmeter is 3.1 ± 0.05V.
2-3: RF AGC
1.
Receive the VHF HIGH (70dB).
2.
Connect the digital voltmeter between the pin 5 of
CP603 and the pin 1 (GND) of CP603.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (5) on the remote control.
The Fig. 2-2 appears on the display.
4.
Press the channel button (1) on the remote control.
5.
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 2.3 ± 0.05V.
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6.
7.
8. 0. RETURN
"The adjustment items 2 and 3 are not used for this
model."
Fig. 2-2
D2-1
ELECTRICAL ADJUSTMENTS
(TV SECTION)
2-4: CONSTANT VOLTAGE
1.
Connect the digital voltmeter to TP401.
2.
Set condition is AV MODE without signal.
3.
Adjust the VR502 until the DC voltage is 135 ± 0.5V.
2-5: OSD HORIZONTAL
1.
Using the remote control, set the brightness and
contrast to normal position.
2.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (5) on the remote control.
The Fig. 2-2 appears on the display.
3.
Press the channel button (4) on the remote control.
4.
Press the VOL. UP/DOWN button on the remote
control until the difference of A and B becomes
minimum. (Refer to Fig. 2-3)
[ TV ]
OSD H
A
2-6: HORIZONTAL PHASE
1.
Receive the center cross signal from the Pattern
Generator.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
4.
Press the channel button (1) on the remote control.
5.
Press the VOL. UP/DOWN button on the remote
control until the right and left screen size of the vertical
line becomes the same.
B
Fig. 2-3
2-7: VERTICAL SIZE
NOTE: Adjust after performing adjustments in section 2-6.
1.
Receive the cross hatch signal from the Pattern
Generator.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
4.
Press the channel button (3) on the remote control.
5.
Press the VOL. UP/DOWN button on the remote
control until the rectangle on the center of the screen
becomes square.
6.
Receive a broadcast and check if the picture is normal.
2-8: VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-7.
1.
Receive the cross hatch signal from the Pattern
Generator.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
4.
Press the channel button (5) on the remote control.
5.
Press the VOL. UP/DOWN button on the remote
control until the SHIFT quantity of the OVER SCAN on
upside and downside becomes minimum.
2-9: VERTICAL POSITION
NOTE: Adjust after performing adjustments in section 2-8.
1.
Receive the center cross signal from the Pattern
Generator.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
4.
Press the channel button (4) on the remote control.
5.
Press the VOL. UP/DOWN button on the remote
control until the horizontal line becomes fit to the notch
of the shadow mask.
1. H. PHASE
2. H. BLK
3. V. SIZE
4. V. POSI
5. V. LIN
6. V. SC
7. V. COMP
8. (H FREQ) 0. RETURN
"The adjustment item 8 is not used for this model."
Fig. 2-4
2-10: FOCUS
1.
2.
3.
2-11: CUT OFF
1.
2.
3.
4.
5.
6.
D2-2
Receive a broadcast.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
Place the set with Aging Test for more than 15 minutes.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (5) on the remote control.
The Fig. 2-2 appears on the display.
Press the channel button (5) on the remote control.
Adjust the Screen Volume until a dim raster is obtained.
ELECTRICAL ADJUSTMENTS
2-12: SUB BRIGHTNESS
1.
Receive the black pattern*. (RF Input)
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
4.
Press the channel button (1) on the remote control.
5.
Press the VOL. UP/DOWN button on the remote
control until the screen begin to shine.
6.
Receive the black pattern*. (Audio Video Input)
7.
Press the TV/VCR button on the remote control to set
to the AV mode. Then perform the above adjustments
2~5.
*The Black Pattern means the whole black raster signal.
Select the "RASTER" of the pattern generator, set to
the OFF position for each R, G and B.
1. BRIGHT
2. CONTRAST
3. COLOR
4. TINT
5. SHARPNESS
6. OSD CONT
7.
8. 0. RETURN
Fig. 2-5
2-14: SUB TINT
1.
Receive the color bar pattern. (RF Input)
2.
Using the remote control, set the brightness, contrast,
color and tint to normal position.
3.
Connect the synchro scope to TP803.
4.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
5.
Press the channel button (4) on the remote control.
6.
Press the VOL. UP/DOWN button on the remote
control until the section "A" becomes a straight line.
(Refer to Fig. 2-7)
7.
Receive the color bar pattern. (Audio Video Input)
8.
Press the TV/VCR button on the remote control to set
to the AV mode. Then perform the above adjustments
2~6.
"A"
Fig. 2-7
2-13: SUB COLOR
1.
Receive the color bar pattern. (RF Input)
2.
Using the remote control, set the brightness, contrast,
color and tint to normal position.
3.
Connect the synchro scope to TP801.
4.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
5.
Press the channel button (3) on the remote control.
6.
Adjust the VOLTS RANGE VARIABLE knob of the
oscilloscope until the range between white 100% and
0% is set to 4 scales on the screen of the oscilloscope.
7.
Press the VOL. UP/DOWN button on the remote
control until the red color level is adjusted to 100 ± 5%
of the white level. (Refer to Fig. 2-6)
8.
Receive the color bar pattern. (Audio Video Input)
9.
Press the TV/VCR button on the remote control to set
to the AV mode. Then perform the above adjustments
2~7.
White 0%
0%
2-15: SUB CONTRAST
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
2.
Press the channel button (2) on the remote control.
3.
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "82"
4.
Press the TV/VCR button on the remote control to set
to the AV mode.
5.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
6.
Press the channel button (2) on the remote control.
7.
Press the VOL. UP/DOWN button on the remote
control until the contrast step No. becomes "97"
2-16: SUB SHARPNESS
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
2.
Press the channel button (5) on the remote control.
3.
Check if the step No. of SHARPNESS is "24".
4.
Press the TV/VCR button on the remote control to set
to the AV mode. Then perform the above adjustments
1~3.
Red Level
White 100%
100%
Fig. 2-6
2-17: OSD CONTRAST
1.
Using the remote control, set the brightness and
contrast to normal position.
2.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control.
The Fig. 2-5 appears on the display.
3.
Press the channel button (6) on the remote control.
4.
Check if the step No. of OSD CONT. is "0".
D2-3
ELECTRICAL ADJUSTMENTS
2-18: WHITE BALANCE
NOTE: Adjust after performing adjustments in section 2-11.
1.
Place the set with Aging Test for more than 15 minutes.
2.
Receive the white 100% signal from the Pattern
Generator.
3.
Using the remote control, set the brightness and
contrast to normal position.
4.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (2) on the remote control.
The Fig. 2-8 appears on the display.
5.
Perform channel button 2 through 7 on the remote
control until the screen becomes white.
1. AKB AUTO
2. R.BIAS
3. G.BIAS
4. B.BIAS
5. R.DRIVE
6. G.DRIVE
7. B.DRIVE
8. AGC AUTO 0. RETURN
"The adjustment items 1 and 8 are not used for this
model."
Fig. 2-8
2-19: H. BLK
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
2.
Press the channel button (2) on the remote control.
3.
Switch the R/L by using the ENTER button on the
remote control and check if the H. BLK step No.
becomes "R0, L0".
2-20: V. S-CORRECTION (V. SC)
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
2.
Press the channel button (6) on the remote control.
3.
Check if the step No. of V. SC is "0".
2-21: V. COMP
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control.
The Fig. 2-4 appears on the display.
2.
Press the channel button (7) on the remote control.
3.
Check if the step No. of V. COMP is "7".
D2-4
ELECTRICAL ADJUSTMENTS
3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE
(VCR SECTION)
TP1001
TP1002
TP4001
CP603
TU601
L610
TP601
TP4201
J4201
SYSCON PCB
D2-5
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