230V AC, 50Hz
55W
Standby 6W
Approx.12.8 kg (28.16 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.)
14 in. (34 cm “V”), 90 degree
deflection
Frequency synthesized tuner
UHF: 21 to 69
I
240 lines
5°C to 40°C
Rotary 2 head helical scanning system
PAL colour signal, 625 lines, 50 fields
Azimuth 2 heads
VHS video cassettes
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 .............................................................................................
IC DESCRIPTIONS ............................................................................................................................................................
SYSTEM SWITCH MODE ..................................................................................................................................................
SEMICONDUCTOR BASE CONNECTIONS......................................................................................................................
BLOCK DIAGRAMS
TV ....................................................................................................................................................................................
POWER SCHEMATIC DIAGRAM ......................................................................................................................................
TV POWER SCHEMATIC DIAGRAM .................................................................................................................................
CHASSIS REPLACEMENT PARTS LIST...........................................................................................................................
ELECTRICAL REPLACEMENT PARTS LIST ....................................................................................................................
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
Page 4
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
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 and CP850).
3.
Remove the CRT PCB in the direction of arrow.
Back Cabinet
4
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, CP757, CP302, CP401, CP501 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 and CP805).
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
Page 5
DISASSEMBLY INSTRUCTIONS
1-5: DECK SHIELD PLATE (Refer to Fig. 1-5)
1.
Remove the 2 screws 1.
2.
Remove the 4 screws 2.
3.
Remove the screw 3.
4.
Remove the Deck Shield Plate in the direction of arrow (A).
5.
Remove the screw 4.
6.
Remove the Shield Plate Bottom in the direction of arrow (B).
Deck Shield Plate
3
1
1
(A)
VCR Block
2
2
(B)
1
1
1
Deck Chassis
Syscon PCB
Fig. 1-6
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 2 screws 2.
4.
Unlock the 2 supports 3.
5.
Remove the Jack Plate in the direction of arrow (B).
Jack Plate
2
Shield Plate Bottom
4
2
Fig. 1-5
1-6: DECK CHASSIS (Refer to Fig. 1-6)
1.
Remove the 3 screws 1.
2.
Disconnect the following connectors:
(CD1002, CP1004, CP1005, CP1006, CP4001, CP4004
and CP4005).
3.
Remove the Deck Chassis in the direction of arrow.
Syscon PCB
2
3
(B)
1
(A)
Deck Holder
2
3
Fig. 1-7
B1-2
Page 6
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
Page 7
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
Fig. 2-7
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
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
Page 8
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
Page 9
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
Page 10
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
Page 11
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
Page 12
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
Page 13
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
Page 14
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 for more than 2 seconds.
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 30 minutes before Power On or alternatively, discharge backup capacitor.
Set KeyRemocon KeyOperations
VOL. (-) MIN1
VOL. (-) MIN2
VOL. (-) MIN
VOL. (-) MIN4
VOL. (-) MIN5
VOL. (-) MIN6
VOL. (-) MIN8
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).
3
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".
Writing of EEPROM initial data.
NOTE: Do not use this for the normal servicing.
VOL. (-) MIN9
MethodOperations
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.
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
Page 15
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 30 minutes before Power On or alternatively, discharge backup capacitor.
1.
Set the VOLUME to minimum.
2.
While holding down VOLUME button on front cabinet, press key 6 on remote control for more than 2 seconds.
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
Page 16
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
Page 17
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 30 minutes before Power On or alternatively, discharge backup capacitor.
ADDRESS DATA
00
01
0205
03
04
05
07
08
09
0A
0BC8
0C33
ADDRESS DATA
40
1E
07
6A
00
00
0006
0F
C4
20
02
0D
0E
0F
10
11
12
13
14
15
16
17
18
1926013318
ADDRESS DATA
B3
75
66
A9
40
80
8501
00
6A
00
35
A3
68
1A77
1B5F
1C
1D
1E40
1FF0
2000
21
2200
2300
2400
25
ADDRESS DATA
27F0
2801
29F0
002A
2B00
2C01
2D
00
5F
2E0B
2F01
3004
3100
3280
0E
ADDRESS
3400
3500
3600
3700
3800
39
3A
3B00
3C6C
3D2B
3E21
3F15
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 for more than 2 seconds.
2.
ADDRESS and DATA should appear as FIG 1.
ADDRESSDATA
INIT 00 83
DATA
00
00
POWER ON
PLAY/REC
0010
0003
Fig. 1
ADDRESS is now selected and should "blink". Using the PLAY or STOP button on the remote, step through the
3.
ADDRESS until required ADDRESS to be changed is reached.
Press ENTER to select DATA. When DATA is selected, it will "blink".
4.
Again, step through the DATA using PLAY or STOP button until required DATA value has been selected.
5.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
6.
Repeat steps 3 to 6 until all data has been checked.
7.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
8.
The unit will now have the correct DATA for the new MEMORY IC.
C4-1
Page 18
SERVICING FIXTURES AND TOOLS
(For 2 head 1 speed model,
4 head model)
VHS Alignment Tape
JG001E
JG001F
JG001U
(TTV-P2)
(TTV-P1L)
(VP S-X6 )
1
3
Screwdriver
JG154 Cable
Parts No. SJ-G15-400-000
(For 2 head 2 speed model)
VHS Alignment Tape
JG001C
JG001D
JG001V
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-P2)
(TTV-P1L)
2
(VP S-X6 )
3
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
JG001EStair Steps, 7KHz (For 2 head 1 speed model, 4 head model)
JG001FColor Bar, 1KHz (For 2 head 1 speed model, 4 head model)
JG001UX Value Adjustment (For 2 head 1 speed model, 4 head model)
JG001CStair Steps, 7KHz (For 2 head 2 speed model)
JG001DColor Bar, 1KHz (For 2 head 2 speed model)
JG001V
X Value Adjustment (For 2 head 2 speed model)
JG002BVSR Torque, Brake Torque (S Reel/T Reel Ass'y)
JG002EBrake 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
JG100APlayback Torque, Back Tension Torque During Playback
JG154
Used to connect the test point of SERVICE and GROUND
JG162C/JG162DUsed to connect the Syscon PCB and Main PCB
Used to connect the Syscon PCB and CRT PCBJG162Y
C5-1
Page 19
PREPARA TION FOR SERVICING
Basic Servicing Position (In case of needing to check on all blocks)
1.
Unplug the connector CP351, CP757 and CP302, 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
Syscon PCB
TP1001
CRT PCB
CD850
CP850
Main PCB
JG162Y
CP820
CP810
JG162D
JG162C
CD820
CD810
CP757
To Ground
JG154
Operation PCB
CD351
C5-2
CD750
Page 20
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
Page 21
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.
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
ModelModelContents*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.
Head ACE Azimuth ADJ.
FM Envelope ADJ. (SP Model)
X-Value ADJ. (SP Model)
HiFi Audio PB Level ADJ.
FM Filter ADJ.
C6-1
Page 22
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 (E-180) 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
60~100gf•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
Page 23
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 (JG001C or JG001E).
1.
(Refer to SERVICING FIXTURE AND TOOLS)
Connect CH-1 of the oscilloscope to TP4002(Envelope)
2.
and CH-2 to TP4001(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 Driver
5.
(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 begin 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
(TP4002)
CH-1
CH-2
Track
Track
CH-2
SW Pulse (TP4001)
(1)
(2)
EntranceExit
A
B
Fig. 2-1-A
Max
D1-2
A : B = 3 : 2
Fig. 2-1-B
Page 24
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 (JG001C or JG001E).
(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 TP4002, CH-2 to
5.
TP4001 and CH-3 to HOTsideofAudioOutJack.
Playback the VHS Alignment Tape (JG001U or JG001V).
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
Page 25
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
Page 26
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.
Unplug the AC plug for more than 30 minutes to set the
clock to the non-setting state. (To release the Back-Up
immediately, take the short circuit between C1003 and
GND at the Power Off.) Then, set the volume level to
minimum.
2.
Press the VOL. DOWN button on the set and the
channel button (9) on the remote control for more than
2 seconds 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) or MENU button on the
remote control to end the adjustments.
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7.
8. (VOL TEST) 0. END
"The adjustment items 3, 6 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 TP4001 and CH-2
to pin 7 of CP603.
2.
Playback the alignment tape. (JG001F)
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
1.
Place the set with Aging Test for more than 10 minutes.
2.
Connect the oscillator (39.5MHz) to pin 11 of TU601
through 100 Ω resistor.
3.
Connect the digital voltmeter between the pin 47 ofIC601.
4.
Adjust the L608 until the digital voltmeter is 3.8 ± 0.05V.
2-3: RF AGC
1.
Receive the UHF (80dB).
2.
Connect the digital voltmeter between the pin 5 ofCP603 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 to
select "OTHERS". The Fig. 2-2 appears on the display.
4.
Press the channel button (1) on the remote control to
select "RF AGC DELAY".
5.
Press the PLAY or STOP button on the remote control
until the digital voltmeter is 2.5 ± 0.05V.
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6. (CHROMA VOL)
7.
8. 0. RETURN
"The adjustment items 2, 3 and 6 are not used for this
model."
Fig. 2-2
D2-1
Page 27
ELECTRICAL ADJUSTMENTS
(TV SECTION)
2-4: CONSTANT VOLTAGE
Connect the digital voltmeter to TP401.
1.
Set condition is AV MODE without signal.
2.
Adjust the VR502 until the DC voltage is 135 ± 0.5V.
3.
2-5: CUT OFF
1.
Place the set with Aging Test for more than 15 minutes.
2.
Set condition is AV MODE without signal.
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 (5) on the remote control to
select "OTHERS". The Fig. 2-2 appears on the display.
5.
Press the channel button (5) on the remote control to
select "CUT OFF".
6.
Adjust the Screen Volume until a dim raster is obtained.
2-6: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
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 to
select "AKB". The Fig. 2-3 appears on the display.
5.
Press the channel button (2) on the remote control to
select the "R.BIAS".
6.
Using the PLAY or STOP button on the remote control,
adjust the R.BIAS.
7.
Press the CH. UP/DOWN button on the remote control
to select the "G.BIAS", "B.BIAS", "R.DRIVE",
"G.DRIVE" or "B.DRIVE".
8.
Using the PLAY or STOP button on the remote control,
adjust the G.BIAS, B.BIAS, R.DRIVE, G.DRIVE or
B.DRIVE.
9.
Perform the above adjustments 7 and 8 until the white
color is looked like a 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."
2-7: FOCUS
1.
Receive a broadcast.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
Fig. 2-3
2-8: 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 to
select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (1) on the remote control to
select "H. PHASE".
5.
Press the PLAY or STOP button on the remote control
until the vertical line becomes fit to the notch of the
shadow mask.
1. H. PHASE
2. H. BLK
3. V. SIZE 50/60
4. V. POSI 50/60
5. V. LIN 50/60
6. V. SC 50/60
7. V. COMP
8. (H FREQ) 0. RETURN
"The adjustment item 8 is not used for this model."
2-9: VERTICAL SIZE
NOTE: Adjust after performing adjustments in section 2-8.
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 to
select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (3) on the remote control to
select "V. SIZE 50/60".
5.
Press the PLAY or STOP 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.
7.
Receive the cross hatch signal of NTSC. (Audio Video
Input)
8.
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~5.
2-10: VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-9.
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 to
select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (5) on the remote control to
select "V. LIN 50/60".
5.
Press the PLAY or STOP button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes minimum.
6.
Receive the cross hatch signal of NTSC. (Audio Video
Input)
7.
Press the AV button on the remote control to set to the
D2-2
AV mode. Then perform the above adjustments 2~5.
Fig. 2-4
Page 28
ELECTRICAL ADJUSTMENTS
2-11: VERTICAL POSITION
NOTE: Adjust after performing adjustments in section 2-10.
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 to
select "H/V". The Fig. 2-4 appears on the display.
4.
Press the channel button (4) on the remote control to
select "V. POSI 50/60".
5.
Press the PLAY or STOP button on the remote control
until the horizontal line becomes fit to the notch of the
shadow mask.
6.
Receive the center cross signal of NTSC. (Audio Video
Input)
7.
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~5.
1. BRIGHT
2. CONTRAST
3. COLOR
4. TINT
5. SHARPNESS
6. OSD CONT
7.
8. 0. RETURN
"The adjustment item 4 is not used for this model."
Fig. 2-6
2-12: 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 to
select "OTHERS". The Fig. 2-2 appears on the display.
3.
Press the channel button (4) on the remote control to
select "OSD H".
4.
Press the PLAY or STOP button on the remote control
until the difference of A and B becomes minimum.
(Refer to Fig. 2-5)
[ TV ]
OSD H
A
2-13: SUB BRIGHTNESS
1.
Receive more than 8 steps monochrome pattern (80dB).
(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 to
select "PICTURE". The Fig. 2-6 appears on the display.
4.
Press the channel button (1) on the remote control to
select "BRIGHT".
5.
Press the PLAY or STOP button on the remote control
until the second scale from left end is starting to glitter.
(Refer to Fig. 2-7)
6.
Receive more than 8 steps monochrome pattern. (Audio
Video Input)
7.
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~5.
B
Fig. 2-5
No brilliance on the left end scale.
The next scale have a slight brilliance.
Fig. 2-7
2-14: SUB COLOR
1.
Receive the color bar pattern. (RF Input)
2.
Using the remote control, set the brightness, contrast
and color 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 to
select "PICTURE". The Fig. 2-6 appears on the display.
5.
Press the channel button (3) on the remote control to
select "COLOR".
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 PLAY or STOP button on the remote control
until the red color level is adjusted to 95% of the white
level. (Refer to Fig. 2-8)
8.
Receive the color bar pattern. (Audio Video Input)
9.
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~7.
White 0%
0%
95%
Red Level
White 100%
Fig. 2-8
D2-3
Page 29
ELECTRICAL ADJUSTMENTS
2-15: SUB CONTRAST
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control to
select "PICTURE". The Fig. 2-6 appears on the display.
2.
Press the channel button (2) on the remote control to
select "CONTRAST".
3.
Press the PLAY or STOP button on the remote control
until the contrast step No. becomes "95"
4.
Press the AV 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 to
select "PICTURE". The Fig. 2-6 appears on the display.
6.
Press the channel button (2) on the remote control to
select "CONTRAST".
7.
Press the PLAY or STOP button on the remote control
until the contrast step No. becomes "105"
2-16: SUB SHARPNESS
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (4) on the remote control to
select "PICTURE". The Fig. 2-6 appears on the display.
2.
Press the channel button (5) on the remote control to
select "SHARPNESS".
3.
Check if the step No. of SHARPNESS is "28".
4.
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 1~3.
2-20: V. COMP
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control to
select "H/V". The Fig. 2-4 appears on the display.
2.
Press the channel button (7) on the remote control to
select "V. COMP".
3.
Check if the step No. of V. COMP is "7".
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 to
select "PICTURE". The Fig. 2-6 appears on the display.
3.
Press the channel button (6) on the remote control to
select "OSD CONT".
4.
Check if the step No. of OSD CONT. is "50".
2-18: H. BLK
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (1) on the remote control to
select "H/V". The Fig. 2-4 appears on the display.
2.
Press the channel button (2) on the remote control to
select "H. BLK".
3.
Switch the R/L by using the ENTER button on the
remote control and check if the H. BLK step No.
becomes "R2, L4".
2-19: 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 to
select "H/V". The Fig. 2-4 appears on the display.
2.
Press the channel button (6) on the remote control to
select "V. SC 50/60".
3.
Check if the step No. of V. SC is "0".
4.
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 1~3.
D2-4
Page 30
ELECTRICAL ADJUSTMENTS
3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE
(VCR SECTION)
TP1001
C1003
TP4002
TP4001
L608
IC601
TU601
CP603
J4501
SYSCON PCB
D2-5
Page 31
(TV SECTION)
ELECTRICAL ADJUSTMENTS
J801
TP801
CRT PCB
VR502
FOCUS VOLUME
SCREEN VOLUME
FB401
MAIN PCB
TP401
T501
D2-6
Page 32
ELECTRICAL ADJUSTMENTS
4.PURITY AND CONVERGENCE
ADJUSTMENTS
NOTE
1.
Turn the unit on and let it warm up for at least 30
minutes before performing the following adjustments.
2.
Place the CRT surface facing east or west to reduce the
terrestrial magnetism.
3.
Turn ON the unit and demagnetize with a Degauss Coil.
4-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
1.
Tighten the screw for the magnet. Refer to the adjusted
CRT for the position. (Refer to Fig. 4-1)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
2.
Receive the green raster pattern from the color bar
generator.
3.
Slide the deflection yoke until it touches the funnel side
of the CRT.
4.
Adjust center of screen to green, with red and blue on
the sides, using the pair of purity magnets.
5.
Switch the color bar generator from the green raster
pattern to the crosshatch pattern.
6.
Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of 4
pole magnets.
7.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
8.
Adjust the crosshatch pattern to change to white by
repeating steps 6 and 7.
4-2: PURITY
NOTE
Adjust after performing adjustments in section 4-1.
1.
Receive the green raster pattern from color bar
generator.
2.
Adjust the pair of purity magnets to center the color on
the screen.
Adjust the pair of purity magnets so the color at the
ends are equally wide.
3.
Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole screen
is green.
4.
Confirm red and blue colors.
5.
Adjust the slant of the deflection yoke while watching
the screen, then tighten the fixing screw.
Adjust after performing adjustments in section 4-2.
1.
Receive the crosshatch pattern from the color bar
generator.
2.
Combine red and blue of the 3 color crosshatch pattern
on the center of the screen by adjusting the pair of 4
pole magnets.
3.
Combine red/blue (magenta) and green by adjusting the
pair of 6 pole magnets.
4-4: DYNAMIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 4-3.
1.2.Adjust the differences around the screen by moving the
deflection yoke upward/downward and right/left.
(Refer to Fig. 4-2-a)
Insert three wedges between the deflection yoke and
CRT funnel to fix the deflection yoke.
(Refer to Fig. 4-2-b)
R G B
R
G
B
UPWARD/DOWNWARD SLANT RIGHT/LEFT SLANT
WEDGE
WEDGE POSITION
R
G
B
Fig. 4-2-a
WEDGE
WEDGE
Fig. 4-2-b
R G B
6 POLE MAGNETS
4 POLE MAGNETS
PURITY MAGNETS
Fig. 4-1
D2-7
Page 33
(Television division)
TROUBLESHOOTING GUIDE
( 1 ) that a power supply doesn't
enter
Is there output on the
secondary of T501
dimensions or not?
Yes
Whether is POWER
FAIL normal?
Yes
(In case that there isn't a normal tension for time to do
stanby CD810 every terminal)
No
No
Voltage of C507 is
it normal?
Yes
Whether there is output
for IC501 3rd pin or not?
Yes
Investigate T501.
No
No
Investigate R501 and F501.
Investigate IC506 and IC501.
Investigate T501 and ICP502.
AT6V is it normal?
Yes
AT5.6V is it normal?
Yes
AT 12V is it normal?
Yes
Is there 135V in the
collector of Q503?
No
No
No
No
Investigate IC505.
Investigate IC502.
Investigate IC504 and ICP503.
Investigate F502 and D510.
E-1
Page 34
TROUBLESHOOTING GUIDE
( 2 ) that a power supply doesn't
enter
Is the voltage 5V for
IC1006 10th pin or not?
Yes
Is the voltage of IC1006
54th pin 5V or not?
Yes
Is there 10MHz OSC for
IC1006 67th pin and
68th pin or not?
Yes
(In case that there is a normal tension for time to do
stanby CD810 every terminal)
No
No
No
Investigate D1006 and D1010.
Investigate D1018.
Investigate X1001.
Is there 135V in the
emitter of Q503?
Yes
Is there horizontal out
for Q405 base or not?
Yes
Is there a heater
voltage or not?
Yes
Investigate CRT.
No
No
No
Is the 5V for IC602
48th pin or not?
Yes
Investigate IC602.
No
Investigate TV Power H.
Investigate Q503 with Q501.
Investigate Q1006 and Q1019.
Investigate Q406, R449 and
R450.
E-2
Page 35
A voice isn't though an image
appears
TROUBLESHOOTING GUIDE
Whether does a signal
come to IC352 6th pin
or not?
Yes
Does a signal change at
a volume upgrade/knock
down or not?
Yes
Is the voltage of IC352
1st pin DC 8.3V or not?
Yes
Does a signal come to
CP351 6th pin or not?
No
No
No
No
Whether does a signal
come to IC701 1st pin
or not?
Yes
Investigate IC701 peripheral
circui.
No
Investigate IC4001 11th pin.
Investigate IC1006 28th pin.
Investigate ICP505, D505 and
D509.
Investigate headphone jack
(J351) or a peripheral circuit.
Yes
Investigate a speaker.
E-3
Page 36
A color doesn't adhere to it
TROUBLESHOOTING GUIDE
Whether is wave form of
IC602 14th pin normal or
not?
Yes
Whether is wave form of
IC602 10th pin,11th pin and
12th pin normal or not?
Yes
Investigate Q804, Q805, Q806
and a peripheral circuit.
No
No
Whether is wave form of
IC851 3rd pin normal or
not?
Yes
Investigate IC602 and IC701
No
Investigate X604.
Investigate IC851 and IC853.
E-4
Page 37
An image doesn't appear
TROUBLESHOOTING GUIDE
Is the voltage DC 5V for
IC602 48th pin or not?
Yes
Whether is a luminance
signal early in IC602
34th pin or not?
Yes
Whether is a luminance
signal early in IC4001
52th pin or not?
Yes
R, G, B signal out from
the 10th pin, the 11th
pin and 12th pin?
No
No
No
No
Investigate P.CON 5V line.
Investigate IC602.
Investigate IC4001.
Investigate IC602 and a
peripheral circuit.
Yes
Investigate a transistor of CRT
PCB.
E-5
Page 38
An only horizontal line appears
TROUBLESHOOTING GUIDE
Is the voltage DC 25V for
IC401 6th pin or not?
Yes
Is the voltage DC 12V for
IC401 2nd pin or not?
Yes
Whether does a vertical
signal appear for IC602
46th pin or not?
OSD screen doesn't appear
No
No
No
Investigate C429, D411 and
R452.
Investigate CRT, IC401 and a
peripheral circuit.
Investigate IC602.
The wave form of the
17nd pin, the 18rd pin, the
19th pin, and also the 16th
pin of IC1003 normal?
Yes
The wave form of the 10th
pin, 11th pin and 12th pin
of IC602 normal?
No
No
The wave form of the 21st pin
and the 22nd pin of IC1006 is
investigated.
Q1014 and also Q1015 are
investigated.
Investigate the circuit of IC602
from IC1006.
E-6
Page 39
(VCR SECTION)
PLAY SHUTS OFF
Insert a cassette and push PLAY
button.
TROUBLESHOOTING GUIDE
Does Playback change to
Stop about 3 seconds
later?
No
Does Playback
change to Stop about
6 seconds later?
No
Check IC1006.
Yes
Yes
Check TAPE LOADING, CAPSTAN
DD UNIT and CYLINDER UNIT.
Check REEL SENSOR and
CAPSTAN BELT.
E-7
Page 40
NO PLAYBACK PICTURE
TROUBLESHOOTING GUIDE
Does E-E appear on the
Monitor TV?
Yes
Is there PB Y/C signal
at TP4002 ?
Yes
Is there FM Y signal at
pin 78 or 79 of IC4001?
Yes
Is there CHROMA
signal at pins 55, 54 of
IC4001?
No
No
No
No
Is there voltage at pins
12, 36 and 61of IC4001 5V?
Yes
No
Check Power circuit.
Check IC4001 and the connection of
the CYLINDER.
Check C4035, W905 and the
peripheral circuit.
Check C4075, R4050 and the
peripheral circuit.
Yes
Is there VIDEO signal
at pin 52 of IC4001?
Yes
Check pin 7 of CP603.
No
Check R4040, Q4006 or Replace
IC4001.
E-8
Page 41
NO COLOR DURING PLAYBACK
TROUBLESHOOTING GUIDE
Does FM ENVELOPE
appear at TP4002?
Yes
Does CHROMA signal
appear at pin 52 of IC4001?
Yes
Does CHROMA
signal appear at pins
55 or 54 of IC4001?
Yes
pin 61 of IC4001?
No
No
No
NoIs there voltage at
Check IC4001.
Check R4040, Q4006 and
peripheral circuit.
Check C4075, R4050 and the
peripheral circuit.
Check L4013 or Replace IC4001.
Yes
Check TV Block.
E-9
Page 42
PLAYBACK PICTURE IS NOISY
(EVEN AFTER CLEANING HEADS)
TROUBLESHOOTING GUIDE
Is FM signal at TP4002
more than 200mVp-p?
Yes
Is VIDEO waveform at pin
52 of IC4001 1Vp-p and
are there any noise?
Yes
Is there FM signal at pin 79
of IC4001 200mVp-p?
Yes
Is there CHROMA signal
at pin 55 of IC4001
200mVp-p?
No
No
No
No
Replace CYLINDER UNIT.
Check pin 52 of IC4001 and
peripheral circuit.
Check pins 79 and 78 and
peripheral circuit.
Replace IC4001.
Yes
Replace IC4001.
E-10
Page 43
NO COLOR DURING SELF
RECORDING AND PLAYBACK
TROUBLESHOOTING GUIDE
Does VCR signal
appear at pin 31 or 30 or
28 of IC4001?
Yes
Refer to section "NO COLOR
DURING PLAYBACK".
No
Check J4501, J701 and VIDEO
input circuit.
E-11
Page 44
NO NORMAL AUDIO IN
PLAYBACK MODE
TROUBLESHOOTING GUIDE
Is sound heard on E-E ?
Yes
Does Audio appear at
pin 11 of IC4001?
Yes
Does Audio signal
appear at pin 51 of
IC601?
Yes
Check IC601.
No
No
No
Refer to section "NO E-E".
Check AUDIO HEAD for debris of
stains.
Check that the cinnector from
AUDIO HEAD is fully inserted to
CP4005.
Check L4001, Q4007 and
peripheral circuit.
E-12
Page 45
CAPSTAN DD MOTOR NOT
ROTATING
TROUBLESHOOTING GUIDE
In playback, is the
voltage at pin 5 of
CP1004 12V?
Yes
Is the voltage at pin 8
of CP1004 5V?
Yes
In playback, check the voltage
at pin 3 of CP1004 is 2V or at
pin 38 of IC1006 is normal?
Yes
In playback, is the
voltage at pin 4 of
CP1004 2.5V?
No
No
No
No
Check POWER circuit.
Replace IC1006.
Check pins between 74 and 101 of
IC1006 and peripheral circuit.
Yes
Replace DD MOTOR.
E-13
Page 46
AUDIO CAN NOT BE
RECORDED
TROUBLESHOOTING GUIDE
Is there BIAS at pin 4
of IC4001?
Yes
Is there AUDIO signal at
pins 7 or 8 or 9 of IC4001?
Yes
Is there signal at pin
11 of IC4001?
Yes
Check the lead wire and connector
to A/C HEAD.
No
No
No
Is the voltage at pin 2
of L4003 5V?
Yes
L4003 is broken or shorted.
Check peripheral circuit.
No
Check POWER BLOCK.
Check the circuit of 21 PIN and
TUNER.
Replace IC4001.
E-14
Page 47
CASSETTE IN AND DOWN BUT
UNIT HAS NO FUNCTIONS
TROUBLESHOOTING GUIDE
Does mode indicator
appear in Display?
No
Does VCR operate with
the remote control?
Yes
Check CONTROL PCB.
Yes
No
Check LOADING MOTOR and the
peripheral parts.
Check IC1006.
E-15
Page 48
RECORDING MECHANISM
WORKS, BUT NO VIDEO
RECORDED FROM INPUT
JACK OR TUNER
TROUBLESHOOTING GUIDE
Does video signal
appear at pin 28 or
30 or 31 of IC4001?
Yes
Does FM signal
appear at pin 86 or 89
of IC4001?
Yes
Does FM signal appear
at pin 2 or 4 of CP4001?
Yes
Check CYLINDER UNIT and IC4001.
No
No
No
Check the circuit from VIDEO input
jack to IC4001 and from Tuner Pack
to IC4001.
Check the peripheral circuit IC4001.
Check C4027, C4028 and the
peripheral circuit.
E-16
Page 49
NO E-E (NO VIDEO AND AUDIO
FROM TUNER)
TROUBLESHOOTING GUIDE
Is the voltage at pin
7 of TU601 5V?
Yes
Is the voltage at pin 9 of
TU601 30V?
Yes
Is there waveform at pins
4 and 5 of TU601?
Yes
No
No
Check Power PCB.
No
Check IC601.
Check TU601.
E-17
Page 50
CYLINDER NOT ROTATING
DURING PLAYBACK AND
RECORDING
TROUBLESHOOTING GUIDE
Is the voltage at pin 2 of
CP1005 about DC12V?
Yes
In playback, is the voltage
at pin 5 of CP1005 about
DC1.2V?
Yes
Check CYLINDER MOTOR.
No
No
Check P. CON 12V line and
POWER BLOCK.
Check IC1006.
E-18
Page 51
AUDIO SHAKES
TROUBLESHOOTING GUIDE
Is AUDIO HEAD scratched?
No
Does pin 8 of IC1006
output a 3.0Vp-p square
wave?
Yes
In playback, is the voltage
at pin 4 of CP1004 2.8V?
Yes
Check AUDIO BLOCK.
Yes
No
No
Replace AUDIO HEAD.
Replace CAPSTAN DD MOTOR.
Check peripheral components
of IC1006.
E-19
Page 52
CASSETTE TAPE IS NOT
ACCEPTED
TROUBLESHOOTING GUIDE
Does WORM GEAR of
CASSETTE LOADING
BLOCK activate?
Yes
When cassette is not
inserted ,is EOT BOT
PULSE at pin 2 of CP1006
and pin 1 of CP1002?
No
When a cassette is inserted,
is the voltage between pins
3 and 4 of CP1006?
No
When a cassette is
inserted, is the voltage at
pin 26 of IC1006 5V?
No
Yes
Yes
No
Check WORM GEAR of
CASSETTE LOADING BLOCK.
Check EOT, BOT, PHOTO
SENSOR, pins 17 and 18 of IC1006.
Replace LOADING MOTOR.
Replace IC1006.
Yes
Check circuit of LOADING MOTOR.
E-20
Page 53
WHEN INSERTING CASSETTE,
IT EJECTS IMMEDIATELY
TROUBLESHOOTING GUIDE
Does this same problem
appear when using
another cassette tape?
Yes
When inserting a cassette,
does Emitter of EOT return
to LOW?
Yes
Is pin 17 of IC1006 LOW?
Yes
Check IC1006 circuit.
No
No
No
Defective CASSETTE or
CASSETTE LOADING BLOCK.
Replace EOT PHOTO
TRANSISTORS.
Check R1026 circuit.
E-21
Page 54
FF/REW DO NOT WORK
TROUBLESHOOTING GUIDE
When the FF/REW is pushed,
does the PULSE appear at
pin 72 of IC1006?
Yes
Is the voltage change at
pin 7 of CP1004 when
you press FF/REW?
Yes
Check DECK MECHANISM.
No
No
Check pin 72 of IC1006 lines.
Replace IC1006.
Check pin 7 of CP1004 and
peripheal circuit.
E-22
Page 55
TAPE LOADING IS OK, BUT
UNLOADS IMMEDIATELY
TROUBLESHOOTING GUIDE
Does CYLINDER rotate ?
Yes
Does TP4001 feed
HEAD SWITCHING
PULSE signal 30Hz?
Yes
No
No
Is the voltage at pin 2 of
CP1005, UNREG 12V?
Yes
Replace CYLINDER UNIT.
No
Does PG PULSE
appear at pin 107 of
IC1001?
Yes
No
Check Power circuit.
Does REEL SENSOR
PULSE signal appear at
pins 31 and 32 of IC1006?
No
Check REEL SENSOR.
Replace IC1006.
Yes
E-23
Page 56
PLAYBACK PICTURE JITTERS
VERTICALLY
TROUBLESHOOTING GUIDE
No
Does tracking noise
appear in the picture?
Yes
By adjusting the manual
tracking UP/DOWN
buttons, will the noise
disappear in the picture?
Yes
Are GUIDE POSTS
the right height?
Yes
Is PG SHIFTER
Adjustment 6.5H?
No
No
No
Check P/B ENVELOPE.
Adjust GUIDE POST height.
Adjust PG SHIFTER.
Yes
Check YCA circuit.
E-24
Page 57
PLAYBACK PICTURE JITTERS
HORIZONTALLY
TROUBLESHOOTING GUIDE
Is FG output level at pin
3 of CP1005 5Vp-p?
Yes
Is the voltage at pin 5 of
CP1005 1.2V?
Yes
Replace CYLINDER UNIT.
AUTO TRACKING DOES NOT
OPERATE
By manual tracking, does
the DC level at pin 19 of
IC1006 change?
No
No
No
Replace CYLINDER UNIT.
Replace IC1006.
Check YCA, H/AMP circuit and
CYLINDER UNIT.
Yes
In auto tracking, is the
voltage at pin 19 of IC1006
more than DC0.7V?
Yes
Replace IC1006.
No
Does the CTL PULSE
(about 1.0Vp-p) appear at
pin 6 of IC1006?
1.0Vp-p
Yes
No
Check CONTROL HEAD.
E-25
Page 58
WHEN PLAYBACK, FAST
FORWARD OR REWIND MODE
IS ACTIVATED, UNIT STOPS
IMMEDIATELY
TROUBLESHOOTING GUIDE
Does CAPSTAN DD
MOTOR rotate?
Yes
Is CAPSTAN BELT normal?
Yes
Does REEL SENSOR PULSE
signal appear at pin 32 of
IC1006?
Yes
Does REEL SENSOR PULSE
signal appear at pin 31 of
IC1006?
No
No
No
No
Refer to section "CAPSTAN DD
MOTOR NOT ROTATING".
Replace CAPSTAN BELT.
Check Reel Sensor of Q1001 and
R1006.
Check Reel Sensor of Q1005 and
R1019.
Yes
Replace IC1006.
E-26
Page 59
PLAYBACK PICTURE SHAKES
TROUBLESHOOTING GUIDE
Is FG Pulse output
level at pin 3 of
CP1005 about 5Vp-p?
Yes
Does pin 108 of IC1006 output
a 5Vp-p square wave?
Yes
In playback, is the voltage
at pin 5 of CP1005 about 1.2V?
Yes
Replace CYLINDER MOTOR.
No
No
No
Replace CYLINDER MOTOR.
Replace IC1006.
E-27
Page 60
IC DESCRIPTIONS
OEC0078C (IC1006)
No.PORTPIN NAMEI/ODESCRIPTION
1CTL(+)CTL(+)I/O Input and output terminal of Control Head.
2SVSSSVSS— Ground.
3CTL(-)CTL(-)I/O Input terminal of Control Head.
4CTLBIASCTLBIASIN Input terminal for Control Bias.
5CTLFBCTLFBIN Input terminal for Control Feedback.
6CTLAMP(O)CTLAMP(O)OUT Output terminal for Control Amp Output.
7CTLSMT(I)CTLSMT(I)IN Input terminal for Control SMT Input.
8CFGCFGIN Input terminal for Capstan FG input.
9SVCCSVCC— P.CON +5 V.
10AVCCAVCC— AT +5 V.
11AN0Hi-Fi_ENVIN Input terminal of HIFI sound envelope signal.
12AN1KEY_AIN Main unit key input.
13AN2KEY_BIN
14AN3MSSEN_BIN Input terminal of mecha state sensor.
15AN4MSSEN_AIN
16AN5AFT.S.CURVEIN AFT S.CURVE input for tuner.
17AN6EOTIN Tape end sensor input signal.
18AN7BOTIN Tape start sensor input signal.
19AN8VIDEO_ENVIN Input terminal of Video RF envelope.
20AN9DEWIN Input terminal of Dew sensor
21ANATUNER AGCIN Input terminal of Electric field strength for Auto setup.
22ANBMESECAM-HIN Input terminal of MESECAM or NOT
23AVSSAVSS— Ground.
24P50FF/REW-LOUT Not used.
25P51LDM_RVSOUT Output signal to control the rotation direction of the loading motor.
26P52LDM_FWDOUT
27P53AKB CTLOUT Output signal to Adjustment of AKB WHITE
28P40DA RGB SWOUT Output signal to cut of RGB sync
29P41SECAM-HOUT Output signal of SECAM or NOT
30P42-— Not used.
31P43REEL-TIN Input terminal of reel sensor TAKE UP.
32P44REEL-SIN Input terminal of reel sensor SUPPLY.
33P45CAP_MID-HOUT Output terminal for capstan speed medium.
34P46CAP_HI-HOUT Output terminal for capstan speed high.
35P46TV POWER_ON-HOUT For control of the user TV-power switch ON/OFF.
36P30VCR POWER_ON-H OUT For control of the user VCR-power switch ON/OFF.
37P31VV-HOUT Output terminal for select Playback/Recording at the circuit of sound.
38P32CAP_LIMIT3OUT Switch the maximum out put current of the CAPSTAN Motor
39P33IIC OFFIN Input signal to Communications of all the terminals are cut(for Factory adjustment)
40P34PICTURE_CONTROL OUT Not used.
41P35CENT_LEDOUT Output terminal for center LED control.
42P36CTL_MONITOROUT Output terminal for control Monitor.
F1-1
Page 61
IC DESCRIPTIONS
OEC0078C (IC1006)
No.PORTPIN NAMEI/ODESCRIPTION
43VSSVSS— Ground.
44P37DEGAUSSOUT Output terminal for DEGAUSS
45VCCVCC— AT +5V.
46SI1SI1IN Input terminal of DATA FZTAT input.
47SO1SOD DATAOUT Output terminal of DATA FZTAT output.
48SCK1-— Not used.
49SDAIIC_DATAOUT Output Data terminal for I2CBUS communivation.
50SCLIIC_CLKOUT Output Clock terminal for I2CBUS communivation.
51SI2OSD_CEOUT Output terminal of signal OSD_IC is CE.
52SO2OSD_DATAOUT Output terminal of OSD DATA.
53SCK2OSD_CLKOUT Output terminal of OSD Clock data.
54P10POWER_FAILIN input for AC power.
55P11-— Not used.
56P12P12IN AT +5 V.
57P13P13IN
58P14P14IN
59/IRQ5-— Not used.
60/ICREMOCON ININ Receive the remote control signal input.
61P1732KHz_MONITOROUT Not used.
62FEWFEWIN Input terminal of FZTAT signal( L: low signal input).
63/NMI/NMI— AT +5 V.
64X2X2OUT Subclock pluse (32.768KHz).
65X1X1IN Subclock pluse (32.768KHz).
66/RES/RESIN RESET will be done when the voltage goes to HIGH after the restart signal.
67OSC1OSC1IN Connect the main crystal (10MHz).
68VSSVSS— Ground.
69OSC2OSC2OUT Connect the main crystal (10MHz).
70VCCVCC— AT +5 V.
71MD0MD0IN Input terminal of FZTAT signal.
72P60CAP_FWD-LOUT Capstan forward and backward command.
73P61CAP_LIMITOUT Not used.
74P62CAP_FULLOUT Output the HIGH during the acceleration force of Capstan Motor at SLOW mode.
75P63CYL_SPEED_UPOUT Output terminal for correct cylinder during SLOW.
76P64CAP_LIMIT1OUT Not used.
77P65CAP_LIMIT2OUT Not used.
78P66MS_SENS_CTLOUT Output terminal to drive sensor control.
79P67TAB_SWIN Input terminal for judge the tape if it has TAB or not.
80P70TEXT RESETOUT Output terminal of reset for TEXT_IC.
81P71TV MUTE-HOUT Mute signal of TV mute.
82VCCVCC— AT +5 V.
83P72TUNER MUTE-HOUT Mute signal of audio mute for tuner.
84VSSVSS— Ground.
85P73VCR MUTE-HOUT Mute signal of VCR mute.
F1-2
Page 62
IC DESCRIPTIONS
OEC0078C (IC1006)
No.PORTPIN NAMEI/ODESCRIPTION
86P74V.REC.START-HOUT Output terminal for REC signal when record.
87P75PAL/SECAMIN Input terminal from secam_chroma_ic for SECAM or NOT
88P76SOUND BIN Input terminal of SOUND IF(4.5MHz,5.5MHz,6.0MHz,6.5MHz)
89P77SOUND AIN
90P80OTPB LEDOUT Output terminal control for OTPB-LED voltage drive.
91P81SERVICEIN Input terminal for Service Mode.
92SV1SV1OUT Not used.
93SV2SV2OUT
94P84ON_TIMER LEDOUT Output terminal control for ON_TIMER-LED voltage drive.
95P85PLAY LEDOUT Output terminal control for PLAY-LED voltage drive.
96P86T-REC LEDOUT Output terminal control for T-REC-LED voltage drive.
97P87REC LEDOUT Output terminal control for REC-LED voltage drive.
98C.SYNCC.SYNCIN Input terminal for composite C SYNC.
99AUDIO FFHi-Fi_H.SWOUT Output terminal of signal HI-FI sound head switching.
100VIDEO FFVIDEO_H.SWOUT Output terminal of signal Video head switching.
101CAP PWMCAP_PWMOUT Output terminal for PWM of Capstan Motor.
102 DRUM PWMDRUM_PWMOUT Output terminal for PWM of Drum Motor.
103C.ROT-— Not used.
104H.AMP.SW-—
105COMP-—
106EXCTLEXT IN-LIN Input terminal for Compulsion outside input.
107DPGDPGIN Input terminal for DRUM PG signal.
108DFGDFGIN Input terminal for DRUM FG signal.
109VCCVCC— AT +5V.
110VPULSEDUMMY.V.SYNCOUT Output terminal of Video Pluse signal.
111VSSVSS— Ground.
112CTLREFCTLREFOUT Output terminal for AMP REFERENCE.
F1-3
Page 63
IC1006 (OEC0078C)
DPG 107 PIN
DFG 108 PIN
SERVO TIMING CHART
230121113122301234
H. SW. P
100 PIN
V-SYNC (E-E)
98 PIN
REC CTL (REC)
6 PIN
V-SYNC (TRICK PB)
110 PIN
• WAVEFORM CHANGES DEPENDED ON THE TAPE SPEED
CH 1
CH 2
F2-1
Page 64
SYSTEM SWITCH MODE
LOADING DIRECTION
(FWD)
EJECTION
LIGHT
RECEIVING
EOT
BOT
MSSEN A
MSSEN B
LOADING ARM
PINCH ROLLER
T BRAKE
LIGHT
GUARD
LIGHT
RECEIVING
LIGHT
GUARD
LIGHT
RECEIVING(H)
LIGHT
GUARD (L)
LIGHT
RECEIVING
LIGHT
GUARD
FWD
: CAPSTAN FWD ROTATING
DIRECTION
: CAPSTAN RVS ROTATING
RVS
PB SLOW : SETTING SPEED TO SERVO
: MECHANICAL MOVEMENT AND CAPSTAN ROTATING
: MECHANICAL MOVEMENT (NO CAPSTAN ROTATING)
DIRECTION
UNLOADINGSTP3VSRF. SLOW PB/STPSTP2FF/REW
HEAD CLEANING
CLUTCHDIRECT
CONNECTION
S BRAKE
TAPE IN
POWER OFF
STP FF/FWD
FF/REW STP
POWER ON PB
CASSETTE DOWN
FWD
TAPE LOADING
(WHEN MSSEN A IS CHANGED FROM LIGHT GUARD TO
LIGHT RECEIVING, CASSETTE IN WILL BE DETECTED)
Applying positions AA, AB, AC, AD and BA for
the grease or oil are displayed for this section.
Check if the correct grease or oil is applied for
each position.
PCB550
(DECK PCB ASS'Y)
AD
362
511
Page 94
CHASSIS EXPLODED VIEW (BOTTOM VIEW)
302
300
325
307
326
327
354
AA
512
513
350
322
341
AA
514
AA
330
AA
340
BA
511
AA
342
AD
AA
510
343
AD
511
339
AA
AD
503
345
AA
AA
514
AC
M2001
331
AB
346
AA
AA
344
333
312
AA
AA
332
346
311
337
CLASS
GREASE
OIL
504
PART NO.
G-555G
G-488MAB
FL-721AC
MG-33AD
KYODO OIL SLIDAS No. 150BA
MARK
AA
K2-2
Applying positions AA, AB, AC, AD and BA for
NOTE:
the grease or oil are displayed for this section.
Check if the correct grease or oil is applied for
each position.
310S5-OA2-000-760 T REEL ASS'Y1371S5-OP6-005-410 WORM1
311S5-OA3-000-610 LOAD ARM S ASS'Y1
312S5-OA3-000-620 LOAD ARM T ASS'Y150187-654-075-410 SCREW,TAP 2.6-101
313S5-OA4-002-100 GUIDE ROLLER ASS'Y2502S1-072-268-040 VT2+2.6-83
314S5-OA4-001-880 BASE,INCL S ASS'Y150387-743-073-010 VT2+2.6-63
315S5-OA4-001-960 BASE,INCL T(S) ASS'Y150487-743-073-410 SCREW,TAP 2.6-63
316S5-OA4-001-970 P5-3 ARM ASS'Y1505S1-0A1-268-040 SCREW,WASHER(A)M2.6-83
317S5-OA4-002-050 PINCH ROLLER BLOCK1506S1-0B1-264-040 SCREW,WASHER(B)M2.6-41
318S5-OA4-001-750 TENSION ARM ASS'Y150787-261-035-410 SCREW,PAN M2-63
319S5-OA4-001-760 TENSION BAND ASS'Y150887-261-032-410 SCREW,PAN M2-32
320S5-OA4-001-780 PINCH ROLLER LEVER ASS'
321S5-OA6-001-820 BRAKE T ASS'Y1510S2-Q31-54C-5N0 PW,3.1-5.4-0.251
322S5-OA6-001-830 CAP BRAKE ARM ASS'Y1511S2-P26-600-5N0 PW(CUT)2.6-6-0.53
323S5-OA9-002-130 LINK ASS'Y1512S2-Q26-471-3N0 PW 2.6-4.7-0.133
324S5-OA9-002-160 LINK LEVER ASS'Y1513S2-P18-450-5N0 PW(CUT)1.8-4.5-0.51
325S5-OP2-002-610 LEVER,CLUTCH1514S3-ETW-300-000 E-RING 32
326S5-OP2-002-620 RING,CLUTCH1515S1-0A1-235-040 SEMS A M2.3-52
327S5-OP2-002-630 GEAR,CLUTCH1
328S5-OP2-002-710 REEL,S1CP101----CONN,PWB SIDE 52044-04451
329S5-OP2-002-730 STOPPER,REEL S1CP102----CONN,PWB SIDE 173979-21