1-1
A AC :Alternating Current
ACC :Automatic Color Control
ACSS :Automatic Channel Setting System
ADJ :Adjust
A/E :Audio Erase
AFC :Automatic Frequency Control
AFT :Automatic Fine Tuning
AGC :Automatic Gain Control
A.H.SW :Audio Head Switch
ALC :Automatic Level Control
AM :Amplitude Modulation
AMP :Amplifier
ANT :Antenna
APC :Automatic Phase Control
ASS’Y :Assembly
AUX :Auxiliary
B B :Base
BGP :Burst Gate Pulse
BPF :Bandpass Filter
BS :Brodcasting Satellite
BW or B/W :Black and White
C C :Capacitor, Chroma, Collector
CAN :Cancel
CAP :Capstan
CAP.BRK :Capstan Brake
CAP.RVS :Capstan Reverse
CATV :Cable Television
CBA :Circuit Board Assembly
CCD :Charge Coupled Device
C.CTL :Chro Control, Capstan Control
CFG :Capstan Frequency Generator
CHROMA :Chrominance
CNR :Chroma Noise Redution
COMB :Combination
Comb Filter
COMP :Comparator
Composite
Compensation
CONV :Converter
C.ROT SW :Color Rotary Switch
CS :Chip Selcet
C.SYNC :Composite Synchronization
CTL DIV :Control Divide
CUR :Current
CYL :Cylinder
D D :Drum, Digital, Diode, Drain
D.ADJ :Drum Adjust
DC :Direct Current
D.CTL :Drum Control
DEMOD :Demodulator
DET :Detector
DEV :Deviation
DHP :Double High Pass
DIGITRON :Digital Display Tube
DL :Delay line
DOC :Drop Out Compensator
DUB :Dubbing
D.V SYNC :Dummy Vertical Synchronization
E E :Emitter
EE :Electric to Eletric
EMPH :Emphasis
ENA :Enable
ENV :Envelope
EP :Extended Play
EQ :Equalizer
EXP :Expander
F F :Fuse
FB :Feed Back
FBC :Feed Back Clamp
FE :Full Erase
FG :Frequency Generator
FL :Filter
FM :Frequency Modulation
F/R :Front/Rear
FS :Frequency Synthesizer
FSC :Subcarrier Frequency
F/V :Frequency Voltage
G GEN :Generator
H H :High, Horizontal
I IC :Integrated Circuit
IF :Intermediate Frequency
INS :Insert
L L :Low, Left, Coil
LD :LED
LD VTG CTL
:Loading Voltage Control
LECHA :Letter Character
L.M :Level Meter
LP :Long Play
LPF :Low Pass Filter
M MAX :Maximum
MD :Modulator
MECHA.CTL
:Mechanism Control
MIC :Microphone
MIN :Minimum
MIX :Mixer, Mixing
M.M. :Monostable, Multivibrator
MMV :Mono Multi Vibrator
MOD :Modulation, Modulator
MODEM :Modulator-Demodulator
MPX :Multiplex
N NR :Noise Reduction
O OSC :Oscillator
OSD :On Screen Display
P PB :Playback
PCB :Printed Circuit Board
P.CTL :Power Control
PRE-AMP :Preamplifier
P.F :Power Failure
PG :Pulse Generator
PLL :Phase Locked Loop
PREM.DET :Premire Detect
P.P :Peak-to-Peak
PS :Phase Shift
PWM :Pulse Width Modulation
PWR CTL :Power Control
Q Q :Transistor
QH :Quasi Horizontal
QSR :Quick Setting Record
QTR :Quick Timer Record
QV :Quasi Vertical
R R :Resistor, Right
RE(or RC) :Remocon, Receiver
REC :Recording
REC S ‘H’ :Record Start ‘Hight’
REF :Reference
REG :Regulated, Regulator
REMOCON :Remote Control(unit)
RF :Radio Frequency
R/P :Record/Playback
RTC :Reel Time Counter
S S :Serial
S.ACCEL :Slow Accel
SAOP :Second Audio Program
SC :Scart, Simulcast
S.DET :Secam Detect
SH :Shift
SHARP :Sharpness
SIF :Sound Intermediate Frequency
SLD :Side Locking
S/N :Signal to Noise Ratio
SP :Standard Play
ST :Stereo
SUB :Subtract, Subcarrier
SW or S/W :Switch
SYNC :Synchronization
SYSCON :System Control
T T :Coil
TP :Test Point
TR :Transistor
TRK :Tracking
TRANS :Transformer
TU :Tuner, Take-up
U UHF :Ultra High Frequency
UNREG :Unregulated
V V :Volt, Vertical
VA :Always Voltage
VCO :Voltage Controlled Oscillator
VGC :Voltage Gain Control
VHF :Very High Frequency
V.H.SW :Video Head Switch
VISS :VHS Index Search
VPS :Video Program System
VR :Variable Resistor or Volume
V-SYNC :Vertical Synchronization
VTG :Voltage
VV :Voltage to Voltage
VXO :Voltage X-tal Oscillator
W W :Watt
WHT :White
W/O :With out
X X-TAL :Crystal
Y Y/C :Luminance/Chrominance
YNR :Luminance Noise Reduction
Z ZD :Zener Diode
SECTION1 SUMMARY
KEY TO ABBREVIATIONS
1-2
Prior to shipment from the factory, the products are strictly inspected to confrom with the recognized product
safety and electrical codes of the countries in which they are to be sold. However , in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
• Precautions during Servicing
1. Locations requiring special caution are denoted by labels and inscriptions on the cabinet, chassis and
certain parts of the product. When performing service, be sure to read and comply with these and other
cautionary notices appearing in the operation and service manuals.
2. Parts identified by the symbol and shaded (
Y
) parts are critical for safety.
Replace only with specified part numbers.
Note : Parts in this category also include those specified to comply with X-ray emission standards for
products using cathode ray tubes and those specified for compliance with various regulations
regarding spurious radiation emission.
3. Use Specified internal wiring. Note especially:
1) Double insulated wires
2) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulation sheets for transistor
5. Observe that wires do not contact heat producing
parts (heatsinks, oxide metal film resistors, fusible
resistors, etc.)
6. Check that replaced wires do not contact sharp edged
or pointed parts.
7. 1) When a power cord has been replaced, check
that A mark is made on the cord, under strain,
near the aperture, and the flexible cord is
subjected 100 times to a pull of 40N for a duration
of 1 second each.
2) During the test, the cord shall not be displaced by
more than 2mm
8. Also check areas surrounding repaired locations.
IMPORTANT SAFETY PRECAUTIONS
Fig. 1
Power code
1-3
Fig. 3
SAFETY CHECK AFTER SERVICING
Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and
wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified
values in order to verify compliance with safety standards.
• Insulation resistance test
confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed
parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, incrophone jacks,
earphone jacks, etc.) See table below.
• Dielectric strength test
Confirm specified dielectric strength or greater between power cord prongs and exposed accessible parts of
the set (RF terminals, antenna terminals, video and
audio input and output terminals, incrophone jacks,
earphone jacks, etc.) See table below.
• Clearance distance
When replacing primary circuit components, confirm
specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic parts. See table below.
Table 1 : Ratings for selected areas
* Class II model only.
Note. This table is unofficial and for reference only. Be sure to confirm the precise values for your particular
country and locality.
• Leakage Current test
Confirm specified or lower leakage current between B(earth ground, power cord plug prongs) and externally
exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)
Measuring Method: (Power ON)
Insert load Z between B(earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See figure and following table.
Table 2:Leakage current ratings for selected areas.
Note. This table is for IEC member only. Be sure to confirm the precise values for your particular country and
Note. locality.
Fig. 2
AC Line Voltage
AC Line Voltage
100 to 130 V
200 to 240 V
*100 to 130 V
*200 to 240 V
Europe
Australia
Europe
Australia
Other terminals
Antenna earth
terminals
i E 0.7m Apeak
i E 2m ADC
i E 0.7m Apeak
i E 2m ADC
F 10 MΩ/500 V DC
4kV 1 minute
F 6mm(d)
F 8mm(d)
(a Power cord)
Region
Load Z Leakage Current(i)
Earth Ground
(B) to :
Region
Insulation
Resistance
Dielectric
Strength
Clearance
Distance(d),(d)
2k
Ω
50k
Ω
d
Primary circuit terminals
Chassis
a
Exposde
accessible
part
Load
Z
Earth Ground,
Power cord plug prongs
B
AC Voltmeter
1-4
• The Contents of Examination
As all the IC that is applied to VCR is controlled by IIC, mutual communication, if Vcc of IC is short or open
with detecting ‘Acknowledge’ data of the specific IC according to each power(5V, 5VT) µ -COM gets unable to
detect ‘ACK’ data.
µ-COM regards this case as abnormal one and if it can’t detect ‘ACK’ data for a certain time(3.5 sec) the signal of ‘Power Control’ and ‘Timer Control’ are switched to ‘Low’. As a result POWER Switching TR is kept from
generating heat and fire.
• POWER for each IC
S/ 5V POWER SECAM IC
Series 5VT POWER AVCP IC
P/Y/I 5V POWER Modulator
Series 5VT POWER AVCP IC
*Short protection off mode : DJ01 Diode in
PROPOSAL FOR APPLYING SHORT PROTECTION
IIC BUS
5VT SW
POWER
CONTROL
MASTER
TIMER
CONTROL
5VT SW
SLAVE with 5V
SLAVE with 5V
5.3VA
Timer Control
AVCP IC
TUNER
OSD
VPS IC
SECAM IC
Conception
BLOCK Diagram
5.2V 5.2VT
• IC to detect ‘ACK’ data is selected as below because IC is different in accordance to region and option
5.3VA
Power Control
Modulator
Hi-Fi IC
NICAM IC
1-5
In case that defective EEPROM of PAL models is replaced, to operate these sets from the initial state MP KEY
must be repaired as well before delivering to the customer.
If MP KEY isn’t repaired the setting of RF OUT channel or LANGUAGE might be different from that for custormer’s country.
•MP KEY : In case of PAL VCR if holding the REC button on the front panel and the CLEAR button on the
remote control handset for 5 ~ 7 seconds with power being switch all and no tapes,
OK is displayed at FLD for FLD models and LED becomes on for LED CLOCK models.
This is the state that initializing EEPROM is finished.
(In case of PAL VCP if holding the REC button on the front panel and the MENU button on the
remote control handset for 5 ~ 7 seconds with power being off and no tapes, All the LED DOTs
become on. This is the state that initializing EEPROM is finished.)
•MP KEY's function : MP KEY sets EEPROM's data up to the initial state.
SERVICE NOTICE ON REPLACING EEPROM
TIMER
AM
REC
VCR
OK
• FLD MODEL:
MP KEY “OK”
• LED CLOCK MODEL:
MP KEY Switch all on a Light
• LED DOT MODEL:
MP KEY Switch all on a Light
3-1
NICAM
SCART JACK
Hi-Fi
SYSTEM
DISPLAY(DOT,CLK)
AVCP
Micom
KEY-BOARD 2KEY-BOARD 1
T
U
N
E
R
OSC
H
S
R
VPS
L/D IC
Drum
Connector
Secam
W5J5
W5J4
H/SW
PG.ADJ
E2PROM
C
+
S
M
P
S
A/V
MAIN P.C.B (Component Side)
: Measurement point
: Adjustment point
SECTION 3 ELECTRICAL
ELECTRICAL ADJUSTMENT POINTS ARRANGEMENT
3-2
ELECTRICAL ADJUSTMENT PROCEDURES
1. Servo Adjustment
1) PG Adjustment
• Test Equipment
• Adjustment And Specification
a) OSCILLOSCOPE
b) PAL TEST TAPE (VHS SP)
MODE
PLAY
• Adjustment Procedure
a) Insert the PAL SP Test Tape and play.
Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the “ATR” is blink after the
PAL SP Test Tape is inserted.
b) Connect the CH1 of the oscilloscope to the H/SW(W5J4, W5J5) and CH2 to the Video Out for the VCR.
c) Trigger the mixed Video Signal of CH2 to the CH1 H/SW(W5J4, W5J5), and then check the distance
(time difference), which is from the selected A(B) Head point of the H/SW(W5J4, W5J5) signal to the
starting point of the vertical synchronized signal, to 6.5H ± 0.5H (416µs, 1H=64.0µs).
• CONNECTION
• WAVEFORM
V.Out
H/SW(W5J4, W5J5)
VR501 6.5 ± 0.5H
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
V.Out
VR501
H/SW(W5J4,W5J5)
OSCILLOSCOPE
CH1 CH2
V.outH/SW
(W5J4, W5J5)
H/SW
Composite
VIDEO
6.5H(416us)
3-20 3-21
BLOCK DIAGRAMS
1. Power Block Diagram
5.4VA
TO SYS, TU/IF
HOT CIRCUIT
BD101
R101
R102
R106
R115
C103
C113
C112
HOT GND
F101
WH
(BL)
BK
(BR)
PW101
6
7
8
9
10
3
2
4
3
11
12
1
2
IC102
IC103
4
T101
TRANSFORMER
4
2
3
1
RECTIFIER
& SMOOTHING
DRIVE & S/W BLOCK
OVER CURRENT LIMIT
BLOCK
+
TO Canal+
TO TU/IF
12VA
TO CAPSTAN M
24/12VA
33V
TO DRUM
12VA
5.2VT
TO AV, TU/IF,
SECAM, VPS
5.2V
TO Hi-Fi, Sensor
TIMER "H"
D152
D151
D160
SNUBBER
BLOCK
(IC101, R109, C135, D103,
R103,C109, R125, R126)
(D102,R104,
C105,C106)
(D109, C120,
L104,C121)
NOTES : Symbol denotes AC ground.
Symbol denotes DC chassis ground.
!
!
!
!
!
!
!
!
FROM µ-COM
FROM µ-COM
P.CTL"H"
LINE FILTER
BLOCK
(C101,L102,
C102)
RECTIFIER
& SMOOTHING
(D105, C115)
36V S/W
BLOCK
(Q154, R157,
R158,R155)
5VT SW
BLOCK
(Q152, R153,
R154, D156)
5V S/W
BLOCK
PWR CTL
BLOCK
Q163
(Q151, R151,
R152)
(Q162, R161)
FEED-BACK
BLOCK
(R116,R117,R118
R119,R120,R121
C114)
'00 11. 30
F. µ-com
SEARCH "H"
Q161
R163
24V S/W
Q159,R166,R167
RECTIFIER
& SMOOTHING
(D106, C116,
L103,C117)
RECTIFIER
& SMOOTHING
(D110, C123)
3-22 3-23
2. Tu/IF, NICAM & A2 Block Diagram
(From Power)
3-24 3-25
3. Y/C Block Diagram
1) PB Mode 2) REC Mode
ACC
C. COMB LPF
Y
DELAY
MAIN
CONV
C LPF
PB EQ
LPF
YNR
NL
DE EMP
Y/C
MIX
60dB AMP
CLAMP
DOUBLE
LIMIT
PB
PEAKING
MAIN
DE-EMPH
V.H S/W
CLOCK DATA C SYNC
V.OUT(TO MICOM)
V. OUT(TO VPS/PDC)
PB FM
AGC
FM
DEM
SUB
LPF
SP 'B' PB
SP 'A' PB
V. ENV
COLOR
ROTARY
88
5774 59 52 54 51 61 72 71
15 21
46
45
43
41
91
93
10 18 17 21 20 23 24 28 29
11
LP 'A' PB
PB
RF
LP 'B' PB
82
85
IC301
LA71598M
IC201 TA1238F
SP REC
IC 301
LA71598M
COLOR
ROTARY
V. II S/W CLOCK
DATA
C. SYNC REC 'H'
V.OUT(TO MICOM)
(TO DRUM)
90
LP REC
(TO DRUM)
84
71 72 61 51 52 54 57 59
46
45
43
41
38
36
34
32
31
302928242319181110
+
REC FM
EQ
FM
MOD
W/D
CLIP
MAIN
EMPH
AGC
FBC
NL EMPH
DETAIL
ENH
Y-LPF
YNR
BPF1
C. COMB
BPF
Y
DELAY
COMB
AMP
CCD
LPF
S/W
V. IN 1
V. IN 2
V. IN 3
24
15
IC201
TA1238F
S/W V.OUT
’00 11. 30 R10613A
4. System Block Diagram
3-26 3-27
3-28 3-29
5. Hi-Fi, SCART Block Diagram
1
2
3
4
5
6
7
8
9
10
13 16 17 19 20 21
353637
22
32
33
28 5
29
30
31 1
3
31
30
29
28
27
26
25
24
23
Audio input
Block
• Tuner
• F.A/V
• Scart1
• Scart2
Modulator
A.out
(To Tuner)
Scart 1
Audio Out
Scart 2
Audio Out
Normal A.out
(To AVCP)
Normal A.IN
(From AVCP)
Hi-Fi
PNR
Block
Hi-Fi
REC
Block
A
B
IC801
IC901
(From Tuner)
Tuner V.IN
V.OUT
(To AVCP)
V.IN
(From µ-COM)
Scart 2, V.IN
S2 V.IN
S1 V.IN
Scart 1, V.IN
Scart 1, V.OUT
Scart 2, V.OUT
3-30 3-31
CIRCUIT DIAGRAMS
1. Power, Tuner, NICAM/A2 Circuit Diagram
EE MODE(VIDEO)
EE/PB MODE (VIDEO)
TU MODE (AUDIO)
NOTES) Symbol denotes AC ground.
NOTES) Symbol denotes DC chassis ground.
NOTE) Warning
NOTE) Parts that are shaded are critical
NOTE) With respect to risk of fire or
NOTE) electricial shock.
BD101, R101 are defective.
Power dead.
F101 is defective.
Power dead.
IC101 is defective.
Switching dead.
D102 is defective.
No power.
D106 is defective.
No 5.3VAand 5VG, 5VT.
No 14VA, 12VA are 12VT.
D109, C120 are defective.
Q152 is defective.
No 5.2VT.
IC102, IC103 are defective.
Power dead.
NOTE :
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during TUNER mode.
BaseCollectorEmitter
PB RECPB RECPB REC
12.4
9.9
12.3
-27.0
0.0
-15.7
0.0
35.4
4.5
5.0
5.0
4.5
4.6
0.0
12.5
10.0
12.4
-26.6
0.0
-15.4
0.0
35.0
4.5
5.0
5.0
4.5
4.6
0.0
15.0
11.6
15.0
-27.8
5.3
-16.4
5.2
35.7
5.2
0.0
0.0
5.2
5.3
10.0
14.8
11.8
14.8
-27.3
5.2
-16.0
5.2
35.3
5.2
0.0
0.1
5.2
5.3
10.0
11.8
9.3
11.7
-27.9
5.3
-16.5
5.3
36.0
5.3
0.0
0.0
5.3
5.3
0.0
11.9
9.4
11.8
-27.3
5.3
-16.1
5.3
35.6
5.3
0.0
0.0
5.3
5.3
0.0
Q151
Q152
Q153
Q154
Q155
Q156
Q157
Q158
Q159
Q160
Q161
Q162
Q164
Q165
__
TR Voltage Sheet
IC101
1
5
PB
REC
16.1
16.3
4.0
4.6
PB
REC
309
309
0.0
0.0
0.0
0.0
IC102
1
4
PB
REC
4.0
4.0
0.0
0.0
PB
REC
4.9
4.9
3.9
4.0
BaseCollectorEmitter
PB RECPB RECPB REC
3.93.9
0.0
0.02.52.5IC103
* IC103 Voltage Sheet
* IC101 Voltage Sheet * IC102 Voltage Sheet
3-32 3-33 3-34
2. A/V, SECAM, VPS Circuit Diagram
9
1
3 6
2
2
7
16
12
13
8
11
5
4
15
14
10
REC SECAM COLOR
PB AUDIO(MONO)
PB Y+C
PB Y
PB C
REC Y+C
REC Y
REC C
PB SECAM COLOR
REC AUDIO
WAVEFORM
Audio Tracking is failed.
IC301 Pin 93 is defective.
PB COLOR Signal disappear.
IC301 Pin 10 is defective.
EE, PB Screen doesn’t appear.
Q305 is defective.
REC is failded.
D301 or IC301 Pin30 is defective.
PB Screen is bad.
Q301, 302 are defective.
PB COLOR Signal disappear.
X301 is defective.
PB and Recording is failed.
(IC301 doesn’t operate.)
IC301 Pin 23, 24 are defective.
Normal Audio signal is not recorded.
FL301, Q309, Q311 are defective.
No mono Audio Signal
in PB MODE.
Q308, Q309, Q310
are defective.
WAVEFORM & VOLTAGE SHEET
IC301 Pin 20
PB mode
500mvp-p
IC301 Pins 38,32,31
Video in
1Vp-p
IC301 Pin 28
PB/REC mode
4.2Vp-p
IC301 Pin 7
REC mode
1.4Vp-p
IC301 Pin 6
REC mode
2.2Vp-p
IC301 Pin 29
PB mode
2.1Vp-p
IC301 Pin 41
PB mode
400mVp-p
IC301 Pin 64
PB mode
600mVp-p
IC301 Pin 23
PB/REC mode
5Vp-p
IC301 Pin 24
PB/REC mode
5Vp-p
IC301 Pins 71 , 72
REC mode
340mVp-p
IC301 Pins 51, 52,54
PB mode
300mVp-p
IC301 Pin 63
PB mode
600mVp-p
IC301 Pin 11
PB mode
3.2Vp-p
IC301 Pin 10
PB mode
1.8Vp-p
IC301 Pin 43
PB mode
400mVp-p
__
IC301 Voltage Sheet
__
IC301 Oscilloscope Waveform
PB RECPIN PIN PIN PIN PINPB REC PB REC PB REC PB REC
2.44
2.44
2.46
2.45
0.09
2.46
2.46
0
0
0.93
1.68
4.98
1.49
1.68
2.34
5.01
3.08
1.98
1.18
3.01
2.42
2.42
2.44
2.35
0.88
2.34
2.34
0
0
0.93
1.68
2.60
1.52
1.38
2.32
5.02
0.15
2.45
2.45
3.05
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
2.41
0
4.48
4.19
1.69
0.05
0.34
0.34
1.78
1.10
2.97
-
1.45
1.81
3.25
1.82
4.79
1.81
4.10
5.00
2.52
0
4.52
4.23
1.69
0.06
0.34
0.34
1.84
4.57
2.94
2.3
1.37
1.79
3.22
1.95
4.79
2.25
4.10
5.00
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
2.93
3.16
3.02
0
2.34
1.46
9.13
1.94
0.85
0
1.83
2.71
0
2.62
4.91
0.56
3.44
5.00
3.36
3.31
2.92
3.14
2.05
0
2.33
1.44
9.12
1.96
0.85
0
1.82
2.62
0
2.62
4.91
0.57
3.44
5.00
3.37
3.31
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
3.43
3.31
5
5
2.03
2.66
3.87
0
0.80
1.98
2.52
3.37
3.8
1.55
4.96
2.43
0.01
2.42
2.46
2.43
3.43
3.32
5
5
2.03
2.67
3.86
0
1.27
2.92
2.51
1.73
3.17
0.01
4.94
2.41
0.14
2.42
2.45
2.23
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
0
0.03
0
0.03
0.03
0
4.87
1.83
0
1.83
1.83
0.02
2.17
0
0
2.29
0
2.43
5.08
2.43
0
0.04
0
0.03
0.03
0
4.80
3.97
0
3.95
3.98
1.55
0.01
2.01
0
2.38
0
2.41
4.28
2.60
__
TR Voltage Sheet
REC modePB mode
CBBEEC
1.213
1.548
2.161
1.217
2.383
1.222
5.258
0
0
5.256
1.224
0
1.313
1.314
0
3.930
5.158
0
5.061
0
0
0.280
0
0
5.180
3.923
5.251
5.135
5.135
1.924
1.864
2.191
1.499
1.835
1.705
0.545
5.176
0.744
0.720
4.583
1.872
0
1.924
1.237
0.016
1.783
1.813
2.147
1.216
2.420
1.221
5.186
15.624
-5.69
5.189
0.271
1.258
0.625
0.624
0
3.348
5.147
0
5.039
0
0
3.301
0
0
-21.64
3.190
5.179
5.116
5.120
0.092
2.435
2.452
1.494
1.824
1.749
0.557
4.352
-21.49
-21.77
5.148
0.688
1.756
0.092
1.219
5.111
Q301
Q302
Q303
Q304
Q305
Q306
Q307
Q308
Q309
Q310
Q311
Q3A1
Q201
Q202
Q203
CBBEEC
2.239
4.794
3.099
4.264
5.196
4.315
4.652
0.001
0.360
0.048
3.262
1.794
2.238
4.823
3.098
4.260
5.192
4.163
4.554
0.001
0.358
0.050
3.261
1.813
2.216
4.731
3.066
4.216
5.137
4.231
4.467
0.001
0.359
0.059
3.236
1.803
3.574
4.442
1.946
3.199
5.150
2.798
2.215
0.002
2.615
2.780
3.387
2.549
3.565
4.438
1.923
3.2
5.138
2.857
2.938
0.002
2.613
2.802
3.324
2.554
3.567
4.396
0.093
3.176
5.120
2.701
2.203
0.002
2.603
2.701
3.356
2.538
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
__
IC201 Voltage Sheet
3-363-35 3-37
3. System Circuit Diagram
9
8
765
4
3
2
1
10
WAVEFORM
IC502, ZD501 are defective.
LD Motor will not operate.
Q501, Q503 are defective.
µ-COM is unstable.
IC505 is defective.
VCR dead.
X501, X502 are
defective.
µ-COM will not
opreate.
VR501 is defective.
PB PG will not operate.
RS501, RS502, Q514,
Q515 are defective.
Auto stop occures.
ES501, ES502, LD501
are defective.
•Tape mode not Working.
(Tape remaining on reel.)
•Auto Rew not working.
R575, R576, R577, R578
are defective.
Deck will not operater.
IC504 is defective.
Reset is defective.
Set dead.
* IC501 Waveform Photographs
IC501 Pin 24
1V/5mS
REC/PB modes
(V.H/SW)
IC501 Pin 27
1V/2mS
QUE/REV modes
(D.V-SYNC)
IC501 Pin 31
1V/10mS
REC mode
(CTL+)
IC501 Pin 32
1V/10mS
REC mode
(CTL-)
IC501 Pin 38
1V/1mS
REC/PB mode
(DFG)
IC501 Pin 39
1V/10uS
REC/PB modes
(DPG)
IC501 Pin 40
1V/1mS
REC/PB modes
(CFG)
IC501 Pin 43
100mV/10uS
EE/PB modes
(V-IN)
IC501 Pin 45
500MV/10uS
EE/PB modes
(V-OUT)
IC501 Pin 54
1V/20uS
EE/PB modes
(C-SYNC)
BaseCollectorEmitter
PB RECPB RECPB REC
H/L
H/L
0.4
4.43
0.75
H/L
H/L
0.4
4.43
0.75
H/L
H/L
0.7
5.24
0
H/L
H/L
0.7
5.25
0
0
0
0
5.32
0
0
0
0
5.32
0
Q514
Q515
Q506
Q503
Q501
__
System IC Voltage Sheet
IC503
1
5
PB
REC
5.34
5.34
0.00
0.00
4.60
5.21
4.60
5.21
PB
REC
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
__
IC503 Voltage Sheet
PB REC PB REC PB REC PB REC PB REC
0
0
0.78
H/L
H/L
3.34
1
1
3.2
2.2
0.74
4.0
5.28
5.28
5.28
5.24
0
0
5.18
5.18
0
0
0.79
H/L
H/L
3.3
2
2
1.62
2.2
0
2.3
5.28
5.28
5.28
5.28
0
0
5.18
5.18
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
5.24
5.24
H/L
H/L
2.81
2.73
0
H/L
5.15
4.97
2.25
2.25
0
0
2.25
2.25
2.25
Pulse
Pulse
Pulse
5.24
5.24
H/L
H/L
2.81
2.73
0
H/L
5.15
4.88
2.99
2.2
0
0
2.25
2.25
2.25
Pulse
Pulse
Pulse
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
5.24
4.99
2.41
1.36
2.43
0
2.01
1.41
0
1.32
1.35
2.5
2.43
0.38
5.21
0
5.05
5.16
0
5.21
5.24
4.99
2.37
1.36
2.43
0
2.01
1.41
0
1.32
1.35
2.5
2.43
0.38
5.21
0
5.05
5.20
0
5.14
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
0
0
0
5.21
5.21
0
4.58
0
1.45
0.83
0
2.49
2.47
5.29
0
5.29
2.29
3.14
0
2.8
0
0
0
5.21
5.21
0
4.58
0
1.45
0.83
0
2.47
2.47
5.29
0
5.29
5.29
3.15
4.84
2.8
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
2.55
5.07
0
0
0
0
4.7
0
4.87
5.08
5.03
5.28
5.28
4.6
5.2
0
0
0
0
0
2.55
5.07
0
0
0
0
4.7
0
4.87
5.08
5.03
5.28
5.28
4.6
5.2
0
0
0
0
0
__
SYSTEM IC Voltage Sheet
• IC501(HD3977)
3-38 3-39
4. Hi-Fi, SCART Circuit Diagram
V.OUT
V.IN
PB Hi-Fi
NORMAL Audio
(To. AVCP)
(MONO)
3.3K
3.3K
All Audio is not appear.
IC801 42, 43 Pins are defective.
IC801(TDA9605H)
5 10 15 20
35
30
25
40
PB
REC
3.6
1.9
4.4
4.4
4.2
4.1
0.9
0.9
5.1
5.0
0.0
0.0
0.0
4.2
0.7
4.3
0.6
4.2
0.7
4.3
11.9
12.0
3.9
3.9
3.9
3.9
3.9
3.9
0.8
0.8
3.9
3.9
3.9
3.9
0.0
0.0
0.8
0.8
3.9
3.9
3.9
3.9
3.9
3.9
PB
REC
3.8
3.8
3.9
3.9
3.9
3.9
3.9
3.9
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.8
3.9
3.8
3.9
0.0
0.0
3.9
3.8
0.0
0.0
0.0
0.0
6.0
6.0
6.0
6.0
0.0
0.0
6.0
6.0
6.0
6.1
4.5
4.6
3.8
3.8
* IC801 Voltage Sheet
IC901(MM1443)
5 10 15
30
25 20
PB
REC00
4.8
4.8
4.7
4.7
3.8
3.8
1.5
1.5
1.5
1.5
3.3
3.3
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
0
0
PB
REC
2.7
2.7
11.6
11.6
2.7
2.7
11.6
11.6
3.5
3.5
5.5
5.5
5.5
5.5
5.5
5.500
5.5
5.5
11.7
11.7
5.5
5.500
5.5
5.500
5.5
5.500
* IC901 Voltage Sheet
• Top View ...................................................4-1
• Bottom View ............................................4-1
1. Drum Assembly.........................................4-3
2. Plate Assembly Top...................................4-4
3. Holder Assembly CST...............................4-4
4. Guide CST ................................................4-4
5. Bracket Side(L)/Bracket Assembly Door
..................................................................4-4
6. Arm Assembly F/L.....................................4-4
7. Lever Assembly S/W.................................4-4
8. Arm Assembly Cleaner..............................4-6
9. Head F/E...................................................4-6
10.Base Assembly A/C Head.........................4-6
1 1.Brake Assembly S.....................................4-7
12.Brake Assembly T .....................................4-7
13.Arm Assembly Tension..............................4-7
14.Reel S/Reel T ............................................4-7
15.Support CST .............................................4-8
16.Base Assembly P4....................................4-8
17.Opener Lid ................................................4-8
18.Arm Assembly T/up...................................4-8
19.Arm Assembly Pinch.................................4-8
20.Belt Capstan/Motor Capstan.....................4-9
21.Clutch Assembly D33-K ............................4-9
22.Lever F/R ..................................................4-9
23.Gear H-up/D-K ..........................................4-9
24.Bracket Assembly Jog.............................4-10
25.Guide Rack F/L, Gear Rack F/L .............4-10
26.Brake Assembly Capstan........................4-10
27.Gear Drive/Gear Cam/Gear Connector
.................................................................4-11
28.Bracket Assembly L/D Motor ...................4-11
29.Gear Sector.............................................4-12
30.Base Tension/Plate Slider/Lever Tension
................................................................4-12
31.Gear Assembly P3/Gear Assembly P2
................................................................4-13
32.Base Assembly P3/Base Assembly P2
................................................................4-13
33.Arm Assembly Idler Jog..........................4-13
• Tools and Fixtures for Service .............4-14
1. Mechanism and Mode Switch Alignment
Check......................................................4-15
2. Deck Preparation for Adjustment ............4-17
3. Checking Torque .....................................4-17
4. Guide Roller Height Adjustment..............4-18
4-1. Preliminary Adjustment....................4-18
4-2. Precise Adjustment..........................4-18
5. Audio/Control (A/C) Head Adjustment ....4-19
5-1. Preliminary Adjustment....................4-19
5-2. Confirmation of Tape Path between
Pinch Roller and Take-up Guide .....4-20
5-3. Precise Adjustment(Azimuth Adjustment)
.........................................................4-20
6. X-Value Adjustment.................................4-20
7. Adjustment after Replacing Drum Assembly
(Video Heads).........................................4-21
8. Check the Tape Travel after Reassembling
Deck Mechanism.....................................4-21
8-1. Checking Audio and RF Locking Time
during Playback after CUE or REV
.........................................................4-21
8-2. Checking Tape Curling or Jamming
.........................................................4-21
1. Check before starting Repairs ................4-22
2. Required Maintenance............................4-24
3. Scheduled Maintenance..........................4-24
4. Supplies Required for Inspection and
Maintenance............................................4-24
5. Maintenance Procedure..........................4-24
5-1. Cleaning...........................................4-24
5-2. Greasing ..........................................4-25
1. Deck Mechanism.....................................4-26
2. Front Loading Mechanism.......................4-29
1. Front Loading Mechanism Section .........4-31
2. Moving Mechanism Section (1)...............4-32
3. Moving Mechanism Section (2)...............4-33
SECTION 4 MECHANISM
DECK MECHANISM PARTS
LOCATIONS
DECK MECHANISM ADJUSTMENT
MAIN TENANCE/INSPECTION
PROCEDURE
EXPLODED VIEWS
CONTENTS
DECK MECHANISM
DISASSEMBLY
MECHANISM TROUBLESHOOTING
GUIDE
DECK MECHANISM PARTS LOCATIONS(FOR NORMAL MODELS)
4-1
• Top View
• Bottom View
Motor Capstan 23
Gear Connector 32
Gear Cam 31
Brake Assembly 29
Capstan
Belt Capstan 22
Gear Drive 30
Guide Rack F/L 27
Gear Rack F/L 28
Clutch Assembly D33-K
24
Lever F/R 25
26 Gear Assembly H-Up/D-K
Option
38 Gear Assembly P3
39 Gear Assembly P2
35 Base Tension
34 Gear Sector
37 Lever Tension
36 Plate Slider
(For High Rewind Models)
26 Gear Assembly Up/D-K
(For Normal Models)
NOTE : When reassembly perform the
procedure in the reverse order.
1) When reassembling, confirm Mechanism and Mode
Switch Alignment Position (Pefer to Page 4-14)
2) When disassembling, the Parts for Starting No. Should
be removed first.
1 Drum Assembly 3 Screws , Cap FPC A-1
2 Plate Assembly Top Two Hooks A-2
2 3 Holder Assembly CST Chassis Hole A-2
4 Guide CST 2 Hooks A-2
2,3,4 5 Bracket Side (L) 1 Screw A-2
2,3,4 6 Bracket Assembly Door 1 Screw A-2
2,3,4,5,6 7 Arm Assembly F/L Chassis Hole A-2
2,3,4,5 8 Lever Assembly S/W Chassis Hole A-2
9 Arm Assembly Cleaner Chassis Embossing A-3
10 Head F/E 2 Hooks A-3
11 Base Assembly A/C Head 1 Screw A-3
12 Brake Assembly S Chassis Hole A-4
2,3 13 Brake Assembly T Chassis Hole A-4
2,3,12, 14 Arm Assembly Tension Chassis Hole A-4
2,3,12,14 15 Reel S Chassis Shaft A-4
2,3,13 16 Reel T Chassis Shaft A-4
17 Support CST Chassis Embossing A-5
18 Base Assembly P4 Chassis Embossing A-5
19 Opener Lid Chassis Embossing A-5
19 20 Arm Assembly T/Up Chassis Embossing A-5
19 21 Arm Assembly Pinch Chassis Shaft A-5
Starting
No.
Pracedure
Part
Fixing Type
Fig-
ure
22 Belt Capstan A-6
22 23 Motor Capstan 3 Screws A-6
24 Clutch Assembly D33-K 1 Washer A-6
22,24 25 Lever F/R 1 Hook A-6
22,24 26 Gear H-Up/D-K 2 Washers A-6
27 Guide Rack F/L 1Screw A-7
27 28 Gear Rack F/L A-7
27, 28 29 Brake Assembly Capstan Chassis Shaft A-7
27, 28 30 Gear Drive 1 Washer A-8
27, 28, 29 31 Gear Cam Chassis Shaft A-8
27, 28, 29, 30
32 Gear Connector Chassis Shaft A-8
33 Bracket Assembly L/D Motor 3 Hooks A-8
34 Gear Sector 3 Washers A-9
35 BaseTension 1 Screw A-9
22, 24, 25, 36 Plate Slider Chassis Shaft A-9
27, 28, 30,
34, 35
22, 24, 25, 37 Lever Tension Chassis Hole A-9
27, 28, 30,
34, 35
34 38 Gear Assembly P3 2 Hooks
A-10
34, 38 39 Gear Assembly P2 2 Hooks A-10
34, 38, 39 40 Base Assembly P3 Chassis Hole A-10
34, 38, 39, 40
41 Base Assembly P2 Chassis Hole A-10
1, 2 42 Arm Assembly Idler 1 Hook A-10
Starting
No.
Pracedure
Part
Fixing Type
Fig-
ure
Bracket Side 'L' 5
Plate Assembly 2
Top
Lever Assembly 8
S/W
Head F/E 10
Drum Assembly 1
Support CST 17
Base Assembly P2 41
Brake Spring S
Brake Assembly S 12
Arm Assembly 14
Tension
Band Assembly
Tension
Reel S 15
Lever
Assembly S/W 8
6 Bracket
Assembly Door
7 Arm Assembly F/L
Opener Door
4 Guide CST
3 Holder Assembly CST
9 Arm Assembly Cleaner
33 Bracket Assembly
L/D Motor
11 Base Assembly
21 Arm Assembly Pinch
A/C Head
19 Opener Lid
18 Base Assembly P4
40 Base Assembly P3
20 Arm Assembly T/Up
42 Arm Assembly ldler
16 Reel T
13 Brake Assembly T
Brake Spring T
DECK MECHANISM PARTS LOCATIONS(FOR JOG SHUTTLE MODELS)
4-2
• Top View
• Bottom View
NOTE : When reassembly perform the
procedure in the reverse order.
1) When reassembling, confirm Mechanism and Mode
Switch Alignment Position (Pefer to Page 4-14)
2) When disassembling, the Parts for Starting No. Should
be removed first.
1 Drum Assembly 3 Screws , Cap FPC A-1
2 Plate Assembly Top Two Hooks A-2
2 3 Holder Assembly CST Chassis Hole A-2
4 Guide CST 2 Hooks A-2
2,3,4 5 Bracket Side (L) 1 Screw A-2
2,3,4 6 Bracket Assembly Door 1 Screw A-2
2,3,4,5,6 7 Arm Assembly F/L Chassis Hole A-2
2,3,4,5 8 Lever Assembly S/W Chassis Hole A-2
9 Arm Assembly Cleaner Chassis Embossing A-3
10 Head F/E 2 Hooks A-3
11 Base Assembly A/C Head 1 Screw A-3
12 Brake Assembly S Chassis Hole A-4
2, 3 13 Brake Assembly T Chassis Hole A-4
2 ,3,12, 14 Arm Assembly Tension Chassis Hole A-4
2, 3,12,14 15 Reel S Chassis Shaft A-4
2, 3,13 16 Reel T Chassis Shaft A-4
17 Support CST Chassis Embossing A-5
18 Base Assembly P4 Chassis Embossing A-5
19 Opener Lid Chassis Embossing A-5
19 20 Arm Assembly T/Up Chassis Embossing A-5
19 21 Arm Assembly Pinch Chassis Shaft A-5
Starting
No.
Pracedure
Part
Fixing Type
Fig-
ure
22 Belt Capstan A-6
22 23 Motor Capstan 3 Screws A-6
24 Clutch Assembly D33-K 1 Washer A-6
22,24 25 Lever F/R 1 Hook A-6
22,24 26 Gear H-Up/D-K 2 Washers A-6
27 Bracket Assembly Jog 1 Screw A-7
28 Guide Rack F/L 1Screw A-7
28 29 Gear Rack F/L A-7
28, 29 30 Brake Assembly Capstan Chassis Shaft A-7
28, 29 31 Gear Drive 1 Washer A-8
28, 29, 30 32 Gear Cam Chassis Shaft A-8
28, 29, 30, 31
33 Gear Connector Chassis Shaft A-8
34
Bracket Assembly L/D Motor
3 Hooks A-8
35 Gear Sector 3 Washers A-9
36 BaseTension 1 Screw A-9
22, 24, 25, 37 Plate Slider Chassis Shaft A-9
27, 28, 29,
31, 35, 36
22, 24, 25, 38 Lever Tension Chassis Hole A-9
27, 28, 29,
31, 35, 36
35 39 Gear Assembly P3 2 Hooks A-10
35, 39 40 Gear Assembly P2 2 Hooks A-10
35, 39, 40 41 Base Assembly P3 Chassis Hole A-10
35, 39, 40, 41
42 Base Assembly P2 Chassis Hole A-10
1, 2 43 Arm Assembly Idler Jog 1 Hook A-10
Starting
No.
Pracedure
Part
Fixing Type
Fig-
ure
Bracket Side 'L' 5
Plate Assembly 2
Top
Lever Assembly 8
S/W
Head F/E 10
Drum Assembly 1
Support CST 17
Base Assembly P2 42
Brake Spring S
Brake Assembly S 12
Arm Assembly 14
Tension
Band Assembly
Tension
Reel S 15
Lever
Assembly S/W 8
6 Bracket
Assembly Door
7 Arm Assembly F/L
Opener Door
4 Guide CST
3 Holder Assembly CST
9 Arm Assembly Cleaner
34 Bracket Assembly
L/D Motor
11 Base Assembly
21 Arm Assembly Pinch
A/C Head
19 Opener Lid
18 Base Assembly P4
41 Base Assembly P3
20 Arm Assembly T/Up
43 Arm Assembly
ldler Jog
16 Reel T
13 Brake Assembly T
Brake Spring T
Motor Capstan 23
Gear Connector 33
Gear Cam 32
Brake Assembly 30
Capstan
Belt Capstan 22
Gear Drive 31
Guide Rack F/L 28
Gear Rack F/L 29
Clutch Assembly D33-K
Lever F/R 25
24
26 Gear H-Up/D-K
39 Gear Assembly P3
40 Gear Assembly P2
36 Base Tension
35 Gear Sector
38 Lever Tension
37 Plate Slider
27 Bracket Assembly
Jog
DECK MECHANISM DISASSEMBLY
4-3
(For Jog Shuttle Models)
Stator
Drum Motor
Rotor
(S2)
(S3)
(S2)
(S3)
(S1)
(S1)
Cap FPC
H1
(S1)
Drum Sub Assembly
Drum FPC
Optional Parts
Holder FPC or Holder FPC or Holder FPC
(only for 2HD Models) (only for 4HD-Mono Models) (only for 4HD-Hi-Fi Models)
1. Drum Assembly (Fig. A-1-1)
1) Unhook the (H1) on the back side of the Chassis and
separate the Cap FPC.
2) Remove three Screws (S1) and lift up the Drum
Assembly.
3) Remove two Screws (S2) and Separate the Stator of
Drum Motor.
4) Remove two Screws (S3) and Separate the Rotor of
Drum Motor from the Drum Sub Assembly.
(1) When reassembling Cap FPC, two Holes of Drum FPC
are inserted to the two Bosses of Holder FPC correctly.
(Refer to Fig. B-1)
Fig. A-1
NOTE
(Fig. A-1-1)
(Fig. A-1-1)
(Fig. B-1)
Holder FPC
Drum FPC
Cap FPC
Figure in the opposite direction
DECK MECHANISM DISASSEMBLY
4-4
H1
(A)
(B)
H2
Plate Assembly Top
Arm Assembly F/L
Lever Assembly S/W
Bracket Side (L)
(H5)
H3
Groove
Guide CST
Gear Rack F/L Groove
(For Jog Shuttle Models)
H4
Bracket
Assembly Door
(S4)
(S4)
Arm F/L
Holder Assembly CST
Lever Stopper(R)
Lable End(L)
(Optional part for
NETEE Models)
Lable End(R)
(Optional part for
NETEE Models)
Fig. A-2
(Fig. A-2-1)
(Fig. A-2-2)
(Fig. A-2-6)
(Fig. A-2-7)
(Fig. A-2-5)
(Fig. A-2-3)
(Fig. A-2-4)
DECK MECHANISM DISASSEMBLY
4-5
2. Plate Assembly Top (Fig. A-2-1)
1) Unhook the (H1) and separate the Left Side.
2) Unhook the (H2) and lift up the Plate Assembly Top.
(1) When reassembling, confirm (A),(B) Part of the Plate
Assembly Top is inserted to the (L),(R) Grooves of the
Bracket Side(L) and Bracket Assembly Door.
3. Holder Assembly CST (Fig.A-2-2)
1) Push the Lever Stopper (R) in the direction of the arrows
(A) and move the Holder Assembly CST.
2) Push the Bracket Assembly Door to the right and lift up
the Holder Assembly CSTalong the Guide Groove of the
Bracket Assembly Door.
4. Guide CST (Fig.A-2-3)
1) Unhook(H3) in the direction of the arrow and separate
the left side.
2) Unhook (H4) as above No.1) and disassemble the Guide
CST in the direction of the arrow.
5. Bracket Side(L) (Fig. A-2-4)/
Bracket Assembly Door (Fig.A-2-5)
1) Remove the Screw (S4) and disassemble the Bracket
Side(L) in the front.
2) Remove the Screw (S4) and disassemble the Bracket
Assembly Door in the front.
6. Arm Assembly F/L (Fig. A-2-6)
1) Push the Arm Assembly F/L to the left and lift up it.
(1) When reassembling, confirm that the Gear(A) of the Arm
F/L and the Gear(B) of the Gear Rack F/L are assembled
as below.
7. Lever Assembly S/W (Fig. A-2-7)
1) Hook the Spring Lever S/W on (H5).
2) Lift up the left side of the Lever S/W from the Groove(A)
of the Chassis.
NOTE
Plate Assembly Top
Bracket Side (L)
Bracket Assembly Door
Lever Stopper (R)
Holder Assembly CST
(A)
Bracket Side (L)
Bracket Assembly Door
(H3)
(H4)
NOTE
Gear (B)
Gear (A)
(H5)
Spring
Lever S/W
(H5)
(L)
(A)
(R)
(B)
Bracket Assembly Door
Guide Groove
Holer Assembly CST
DECK MECHANISM DISASSEMBLY
4-6
(1) Place the Spring Lever S/W of the above (No.1) as
original position.
8. Arm Assembly Cleaner(Fig. A-3-1)
1) Break away the (A) part shown above Fig. A-3-1 from the
Embossing of the Chassis in the clockwise direction and
lift up the Arm Assembly Cleaner.
9. Head F/E (Fig. A-3-2)
1) Unhook the two Hooks (H1) on the back side of the
Chassis and lift up the Head F/E.
10. Base Assembly A/C Head (Fig. A-3-3)
1) Remove the Screw (S5) and lift up the Base Assembly
A/C Head.
NOTE
Fig. A-3
(Fig. A-3-1)
(Fig. A-3-3)
(Fig. A-3-2)
Spring
Lever S/W
(H5)
(H5)
(S5)
( H1)
Head F/E
Arm Assembly
Cleaner
(A)
Base Assembly A/C Head
(For Jog Shuttle Models)
DECK MECHANISM DISASSEMBLY
4-7
Fig. A-4
11. Brake Assembly S (Fig. A-4-1)
1) Remove the Spring S Brake.
2) Hold the (A) part shown above Fig. A-4-1 and turn to the
clockwise direction, and then lift up the Brake Assembly S.
(1) When reassembling, be careful not to change the Spring
with below No.12.(Refer to Fig. B-2).
12. Brake Assembly T (Fig. A-4-2)
1) Remove the Spring T Brake.
2) Hold the (B) part shown above Fig. A-4-2 and turn to the
counterclockwise direction, and then lift up the Brake
Assembly T.
(1) When reassembling, be careful not to change the Spring
with above No.11.(Refer to Fig. B-2).
13. Arm Assembly Tension (Fig. A-4-3)
1) Remove the Spring T ension.
2) Hold the (C) part shown above Fig. A-4-3 and turn to the clockwise direction, and then lift up the Arm Assembly Tension.
(1) When reassembling, be careful not to change the Spring
with above No.11,12.(Refer to Fig. B-2).
14. Reel S (Fig. A-4-4) & Reel T (Fig. A-4-5)
1) Lift up the Reel S and Reel T.
(1) When reassembling, be careful not to change the Reel S
and Reel T each other.
(2) Confirm two Slide Washers under the Reel S and Reel T.
NOTE
NOTE
(Difference for Springs)
Color (Black)
Three Holes
Reel S
Reel T
(Fig. B-2)
NOTE
NOTE
(Fig. A-4-1)
(Fig. A-4-5)
(Fig. A-4-3)
(Fig. A-4-4)
(Fig. A-4-2)
Spring S Brake
Brake Assembly S
(A)
Arm Assembly
Tension
Spring Tension
(C)
Band
Assembly
Tension
Reel S
Reel T
Spring T Brake
B
(For Jog Shuttle Models)
Brake Assembly T
Spring T Brake
Spring S Brake
Spring Tension
DECK MECHANISM DISASSEMBLY
4-8
(D)
(C)
Opener Lid
Arm Assembly T/up
Base Assembly P4
Support CST
Arm
Assembly
Pinch
(B)
(A)
Fig. A-5
15. Support CST (Fig. A-5-1)
1) Break away the (A) part shown above Fig. A-5-1 from the
Embossing of the Chassis in the clockwise direction, and
lift up the Support CST.
16. Base Assembly P4 (Fig. A-5-2)
1) Break away the (B) part shown above Fig. A-5-2 from the
Embossing of the Chassis in the counterclockwise direction and lift up the Base Assembly P4.
17. Opener Lid (Fig. A-5-3)
1) Break away the (C) Part of the Opener Lid from the
Embossing of the Chassis in the Clockwise direction and
lift up the Opener Lid.
18. Arm Assembly T/up (Fig. A-5-4)
1) Just lift up the Arm Assembly T/UP.
(1) When reassembling, confirm the opener lid is placed on
the Hook(H1) of the Arm Assembly T/UP as below figure.
19. Arm Assembly Pinch (Fig. A-5-5)
1) Lift up the Arm Assembly Pinch.
NOTE
Opener Lid
Arm Assembly T/up
(Fig. A-5-3)
(Fig. A-5-4)
(Fig. A-5-1)
(Fig. A-5-2)
(Fig. A-5-5)
(H1)
DECK MECHANISM DISASSEMBLY
4-9
Belt Capstan
Motor Capstan
Washer(W1)
Washer(W2 )
Optional Parts
Gear H-Up/D-K
(For Hi-Rewind Models) (For Normal Models)
or Gear Up/D-K
Spring Up/D
Lever F/R
Hook(H1)
Brake Assembly Capstan
(For 4HD Models)
(C)
( A')
(B ')
(S6)
Clutch Assembly D33-K
(A)
(B)
(For Jog Shuttle Models)
(For Jog Shuttle Models)
Fig. A-6
20. Belt Capstan (Fig. A-6-1)/
Motor Capstan (Fig. A-6-2)
1) Remove the Belt Capstan.
2) Remove three Screws(S6) on the back side of the
Chassis and lift up the Motor Capstan.
(1) When reassembling, Confirm the (A), (B) parts of Motor
Capstan is located to the (A'), (B') of the Chassis.
21. Clutch Assembly D33-K (Fig. A-6-3)
1) Remove the Washer(W1) and lift up the Clutch Assembly
D33-K.
22. Lever F/R (Fig. A-6-4)
1) Unhook the (H1) shown above Fig. A-6-4 and lift up the
Lever F/R.
(1) When reassembling, move the (C) part of the Lever F/R up
and down, then confirm if it is returned to original position.
23. Gear H-Up/D-K or Gear Up/D-K
(Fig. A-6-5)
1) Remove the Washer(W2) and lift up the Gear H-up/D-K.
2) Remove the Spring Up/D.
(1) Gear H-Up/D-K is for Hi-Rewind Models.
(2) Gear Up/D-K is for Normal Models except Hi-Rewind Models.
NOTE
NOTE
(Fig. A-6-1)
(Fig. A-6-2)
(Fig. A-6-3)
(Fig. A-6-5)
(Fig. A-6-4)
NOTE
DECK MECHANISM DISASSEMBLY
4-10
Brake
Fig. A-7
24. Bracket Assembly Jog (Fig. A-7-1)
(Jog shuttle model option)
1) Remove the Screw(S4) and lift up the Bracket Assembly
Jog.
25. Guide Rack F/L (Fig. A-7-2)/
Gear Rack F/L (Fig. A-7-3)
1) Remove the Screw(S4) and lift up the Guide Rack F/L.
2) Lift up the Gear Rack F/L.
26. Brake Assembly Capstan (Fig. A-7-4)
(4HD model option)
1) Hook the Spring Capstan on the Hook(H1).
2) Unhook the Hook(H2) and lift up the Brake Assembly
Capstan.(Refer to Fig. to the right)
(1) When reassembling, confirm that the Hole(A) of the
Brake Assembly Capstan is aligned to the Hole(B) of the
Gear Cam.
(Refer to above Fig. A-7-4).
NOTE
(Fig. A-7-4)
(Fig. A-7-1)
(Fig. A-7-2)
(Fig. A-7-3)
Hole (A)+(B)
Gear Cam
Guide Rack F/L
(S4)
Gear Rack F/L
Assembly Capstan
(H2)
Hole (A)
(H1)
Barke
Assembly Capstan
(For 4HD Models)
Spring Capstan
(S4)
Barke Assembly Jog
(For Jog Shuttle Models)
Hole (B)
Gear Cam
(For Jog Shuttle Models)
Hook(H2)
Hook(H2)
DECK MECHANISM DISASSEMBLY
4-11
Washer (W1)
Gear Drive
Gear Cam
Gear Connector
Hole (A)
Hole (B')
Hole (B')+(B)
Chassis
Hole (A')+(A)
Gear Cam
Gear Connector
Brake Assembly Capstan
(For 4HD Models)
Hole (A')
Bracket Assembly
L/D Motor
H1
H2
Hole (B)
Fig. A-8
27. Gear Drive (Fig. A-8-1)/
Gear Cam (Fig. A-8-2)/
Gear Connector (Fig. A-8-3)
1) Remove the Washer(W1) and lift up the Gear Drive.
2) Lift up the Gear Cam.
3) Lift up the Gear Connector.
(1) When reassembling, confirm that the Hole (A) of the
Gear Connector is aligned to the Hole (A') of the Chassis
(Fig. A-8-3).
(2) When reassembling, confirm that the Hole (B) of the
Gear Cam is aligned to the Hole (B') of the Chassis (Fig.
A-8-2).
(3) When reassembling, confirm that the (C) part of the Gear
Cam is aligned to the (D) part of the Gear Drive as shown
Fig. B-3
28. Bracket Assembly L/D Motor (Fig. A-8-4)
1) Unhook the three Hooks(H1),(H2) and push down the
Bracket Assembly L/D Motor.
NOTE
Gear Cam (C)
Gear Drive (D)
Hook (H1), (H2)
Chassis
(Fig. B-3)
(Fig. A-8-1)
(Fig. A-8-2)
(Fig. A-8-3)
(Fig. A-8-4)
DECK MECHANISM DISASSEMBLY
4-12
(For Jog Shuttle Models)
Washer
Gear Sector
Plate Slider
Lever Tension
(A)
Base Tension
(W1)
(S4)
Fig. A-9
29. Gear Sector (Fig. A-9-1)
1) Remove the Washer(W1) and lift up the Gear Sector.
30. Base Tension (Fig. A-9-2)/
Plate Slider (Fig. A-9-3)/
Lever Tension (Fig. A-9-4)
1) Remove the Screw(S4) and lift up the Base Tension.
2) Lift up the Plate Slider.
3) Hold the (A) Part of the Lever Tension and turn to the
counterclockwise direction, and then lift up the Lever
Tension.
(1) When reassembling, turn the Lever Tension to the clock-
wise direction in maximum.
(2) Push the plate slide right side to be guided by the shaft.
NOTE
(Fig. A-9-1)
(Fig. A-9-2)
(Fig. A-9-4)
(Fig. A-9-3)
DECK MECHANISM DISASSEMBLY
4-13
Fig. A-10
31. Gear Assembly P3 (Fig. A-10-1)/
Gear Assembly P2 (Fig. A-10-2)
1) Unhook the two Hooks(H1) and lift up the Gear Assembly
P3.
2) Unhook the two Hooks(H2) and lift up the Gear Assembly
P2.
32. Base Assembly P3 (Fig. A-10-3)/
Base Assembly P2 (Fig. A-10-4)
1) Move the Base Assembly P3 in the direction of the arrow of
the Chassis Hole(A) and push down the Base Assembly P3.
2) Move the Base Assembly P2 in the direction of the arrow of
the Chassis Hole(B) and push down the Base Assembly P2.
33. Arm Assembly Idler or Arm Assembly
Idler Jog(Fig. A-10-5)
1) Unhook the Hook(H3) and push down the Arm Assembly
Idler Jog.
1) Arm Assembly Idler is for Normal Models.
2) Arm Assembly Idler Jog is for Jog Shuttle Models.
1) When reassembling, confirm that the (A) Part of the Gear
Assembly P3 is aligned to the (B) Part of the Gear Assembly
P2 as shown below.
NOTE
NOTE
(Fig. A-10-1)
(Fig. A-10-2)
(Fig. A-10-4)
(Fig. A-10-3)
(Fig. A-10-5)
(Unloading Condition)
Gear Assembly P3
H1
Gear Assembly P3
Optional Parts
Arm Assembly Idler
(For Normal Models) (
(A)
(B)
Gear Assembly P2
Arm Assembly Idler Jogor
For Jog Shuttle Models)
H2
Gear Assembly P2
(A)
(B)
Chassis
Base Assembly P2
(H3)
Base Assembly P3
Gear Assembly P3
(A)
(B)
Gear Assembly P2
DECK MECHANISM DISASSEMBLY
4-14
• Tools and Fixfures for Service
1. Cassette Torque meter
1. SRK-VHT-303(Not SVC part)
1. Parts No: D00-D006
4. Torque gauge adaptor
Parts No:D09-R001
5. Post height adjusting driver
Parts No:DTL-0005
6. + Type driver (ø 5)
2. Alignment tape
Parts No NTSC: DTN-001
PAL:DTN-0002
3. Torque gauge
3. 600g.Cm ATG
3. Parts No:D00-D002
SRK
VIDEO
CASSETTE
TORQUE
METER
VHT-303
S
R
K
-
V
H
T
-
S
S
R
K
-
V
H
T
-
T
300
250
200
150
50
0
300
250
200
150
50
0
100
DECK MECHANISM ADJUSTMENT(FOR NORMAL MODELS)
4-15
Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected.
1.Mechanism Alignment Position Check
1) Turn the Power S/W on and eject the Cassette by pressing the Eject Button.
2) Remove the Top Cover and Plate Assembly Top, visually check if the Gear Cam Hole is aligned with the
Chassis Hole as below Fig. C-2.
3) IF not, rotate the Shaft of the Loading Motor to either
Clockwise or Counterclockwise until the Alignment is
as below Fig. C-2.
4) Remove the Screw which fixes the Deck Mechanism and
Main Frame and confirm if the Gear Cam is aligned with
the Gear Drive as below Fig. C-1(A).
5) Confirm if the Mode S/W on the Main P.C.Board is
aligned as below Fig. C-1(B).
6) Remount the Deck Mechanism on the Main P.C.Board
and check each operation.
Mode S/W
Gear Cam
Gear Drive
(A)
(B)
L/D Motor Assembly
Gear Cam Hole
Gear Cam
Chassis Hole
Test Equipment/ Fixture
• Blank tape
Test Conditions (Mechanism
Condition)
• Eject Mode (with Cassette ejected)
Check Point
• Mechanism and Mode Switch Position
Fig. C-1
Fig. C-2
CHECK DIAGRAM
BOTTOM VIEW
TOP VIEW
Gear Cam (o) and Gear Drive (o) groove alignment
DECK MECHANISM ADJUSTMENT(FOR JOG SHUTTLE MODELS)
4-16
Purpose:To determine if the Mechanism is in the correct position, when a Tape is ejected.
1.Mechanism Alignment Position Check
1) Turn the Power S/W on and eject the Cassette by pressing the Eject Button.
2) Remove the Top Cover and Plate Assembly Top, visually check if the Gear Cam Hole is aligned with the
Chassis Hole as below Fig. C-2.
3) IF not, rotate the Shaft of the Loading Motor to either
Clockwise or Counterclockwise until the Alignment is
as below Fig. C-2.
4) Remove the Screw which fixes the Deck Mechanism and
Main Frame and confirm if the Gear Cam is aligned with
the Gear Drive as below Fig. C-1(A).
5) Confirm if the Mode S/W on the Main P.C.Board is
aligned as below Fig. C-1(B).
6) Remount the Deck Mechanism on the Main P.C.Board
and check each operation.
Mode S/W
Gear Cam
Gear Drive
(A)
(B)
L/D Motor Assembly
Gear Cam Hole
Gear Cam
Chassis Hole
Test Equipment/ Fixture
• Blank tape
Test Conditions (Mechanism
Condition)
• Eject Mode (with Cassette ejected)
Check Point
• Mechanism and Mode Switch Position
Fig. C-1
Fig. C-2
CHECK DIAGRAM
BOTTOM VIEW
TOP VIEW
Gear Cam (o) and Gear Drive (o) groove alignment
DECK MECHANISM ADJUSTMENT
4-17
Purpose: To insure smooth Transport of the Tape during each Mode of Operation.
If the Tape Transport is abnormal, then check the Torque as indicated by the chart below.
2. Preparation for Adjustment (To set the
Deck Mechanism to the Loading state
without inserting a Cassette Tape).
1) Unplug the Power Cord from the AC Outlet.
2) Disassemble the Top Cover and Plate Assembly Top.
3) Plug the Power Cord into the AC Outlet.
4) Turn the Power S/W on and push the Lever Stopper
(L),(R) of the Holder Assembly CST to the back for
Loading the Cassette without Tape.
Cover the Holes of the End Sensors at the both sides of
the Bracket Side(L) and Bracket Assembly Door to prevent a light leak.
Then The Deck Mechanism drives to the Stop Mode.
In this case, The Deck Mechanism can accept inputs of
each mode, however the Rewind and Review Operation
can not be performed for more than a few seconds
because the Take-up Reel Table is in the Stop State
and can not be detected the Reel Pulses.
3. Checking Torque
The Values are measured by using a Torque Gauge and
Torque Gauge Adaptor with the Torque Gauge affixed.
The Torque reading to measure occurs when the Tape
abruptly changes direction from Fast Forward of Rewind
Mode, when quick bracking is applied to both Reels.
SRK
VIDEO
CASSETTE
TORQUE
METER
VHT-303
S
R
K
-
V
H
T
-
S
S
R
K
-
V
H
T
-
T
300
250
200
150
50
0
300
250
200
150
50
0
100
Test Equipment/ Fixture
• Torque Gauge(600g/cm ATG)
• Torque Gauge Adaptor
• Cassette Torque Meter
SRK-VHT-303
Checking Method
• Perform each Deck Mechanism Mode without
inserting a Cassette Tape(Refer to above No.2
Preparation for Adjustment).
• Read the Measurement of the Take-up or Supply
Reels on the Cassette Torque Meter(Fig. C-3-2).
• Attach the Torque Gauge Adaptor to the Torque
Gauge and then read the Value of it(Fig. C-3-1).
NOTE:
Fig. C-3-2
Fig. C-3-1
Torque Gauge
Torque Gauge
Adaptor
Reel Table
Item
Fast Forward Torque
Rewind Torque
Play Take-Up Torque
Review Torque
Mode
Fast Forward
Rewind
Play
Review
Test Equipment
Cassette Torque Gauge
Cassette Torque Gauge
Cassette Torque Meter
Cassette Torque Meter
Measurement Reel
Take-Up Reel
Supply Reel
Take-Up Reel
Supply Reel
Measurement Values
More than 400g/cm
More than 400g/cm
70~120g/cm
130~210g/m
Test Conditions
(Mechanism Condition)
• Play (FF) or Review (REW) Mode
NOTE:
• Cassette Torque Meter (SRK-VHT-303)
• Torque Gauge (600g.cm ATG)
DECK MECHANISM ADJUSTMENT
4-18
4.Guide Roller Height Adjustment
Adjustment Procedure
1) Confirm if the Tape runs along the Tape Guide Line of the
Lower Drum.
2) If the Tape runs the Bottom of the Guide Line, turn the Guide
Roller Height Adjustment Screw to Clockwise direction.
3) If it runs the Top, turn to Counterclockwise direction.
4) Adjust the Height of the Guide Roller to be guided to the
Guide Line of the Lower Drum from the Starting and Ending
Point of the Drum.
Purpose: To regulate the Height of the Tape so that the Bottom of the Tape runs along the
Tape Guide Line on the Lower Drum.
Test Equipment/ Fixture
• Post Height Adjusting Driver
Test Conditions (Mechanism Condition)
• Play or Review Mode
Adjustment Point
• Guide Roller Height Adjustment
screws on the Supply and Take-Up
Guide Rollers.
Fig. C-4-1
Upper Flange
Guide Roller
Retaining Screw
Guide Roller Height
Adjustment screw
ADJUSTMENT DIAGRAM
Test Equipment/Fixture
• Oscilloscope
• Alignment Tape
• Post Height Adjusting
Driver
Test Equipment Connection Points
• CH-1:PB RF Envelope
• CH-2:NTSC: SW 30Hz
PAL: SW 25Hz
• Head Switching Output
Point
• RF Envelope Output
Point
Test Conditions VCR(VCP) State
• Play an Alignment Tape
Adjustment Point
• Guide Roller Height
Adjustment Screws
Fig. C-4-2
Fig. C-4-3
P3 POST
ADJUSTMENT
P2 POST
ADJUSTMENT
Turn the Roller Guide Height
Adjustment Screw slightly
to flatten the waveform.
Tracking control at center
RF ENVELOPE OUTPUT TEST POINT
OSCILLOSCOPE
HEAD SWITCHING OUTPUT TEST
POINT
Turn(Move) the tracking
control to both directions
4-1. Preliminary Adjustment
4-2. Precise Adjustment
Adjustment Procedure
1) Play an Alignment Tape after connecting the Probe of the
Oscilloscope to the RF Envelope Output Test Point and
Head Switching Output Test Point.
2) Tracking Control(in PB Mode) : Center Position(When
this Adjustment is performed after the Drum Assembly
has been replaced, set the Tracking Control so that the
RF Output is Maximum).
3) Height Adjustment Screw : Flatten the RF Waveform.
(Fig. C-4-2)
4) Turn(Move) the Tracking Control(in PB Mode)
Clockwise and Counterclockwise.(Fig. C-4-3)
5) Check that any Drop of RF Output is uniform at the
Start and End of the Waveform.
If the adjustment is excessive or insufficient the tape
will jam or fold.
NOTE
Waveform Diagrams
Connection Diagram
DECK MECHANISM ADJUSTMENT
4-19
5. Audio/Control (A/C) Head Adjustment
10.9
Purpose: To insure that the Tape passes accurately over the Audio and Control Tracks in
exact Alignment in both the Record and Playback Modes.
Test Equipment/ Fixture
• Blank Tape
• Screw Driver(+) Type 5mm
• Play the blank tape
Test Conditions (Mechanism Condition)
Adjustment Point
• Tilt Adjustment Screw(C)
• Height Adjustment Screw(B)
• Azimuth Adjustment Screw(A)
Fig. C-5-1
A/C Head Base
Fig. C-5-2
Height Adjustment
Screw(B)
Tilt Adjustment
Screw(C)
Azimuth Adjustment
Screw(A)
X-Value Adjustment
Hole
Fixed Screw
Fig. C-5-3
A/C Head
Tape
Tape
0.2~0.25mm
P4
5-1. Preliminary Adjustment (Height and Tilt Adjustment)
Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape.
1) Initially adjust the Base Assembly A/C Head as shown
Fig. C-5-1 by using the Height Adjustment Screw(B).
2) Play a Blank Tape and observe if the Tape passes accurately over the A/C Head without Tape Curling or Folding.
3) If Folding or Curling is occured then adjust the Tilt
Adjustment Screw(C) while the Tape is running to resemble Fig. C-5-3.
4) Reconfirm the Tape Path after Playback about 4~5 seconds.
Ideal A/C head height occurs, when the tape runs
between 0.2~0.25mm above the bottom edge of the A/C
head core.
NOTE
Adjustment Procedure/Diagrams
A/C Head Assembly
DECK MECHANISM ADJUSTMENT
4-20
Purpose: To obtain compatibility with other VCR(VCP) Models.
5-2. Confirm that the Tape passes smoothly
between the Take-up Guide and Pinch
Roller(using a Mirror or the naked eye).
1) After completing Step 5-1.(Preliminary Adjustment),
check that the Tape passes around the Take-up Guide
and Pinch Roller without Folding or Curling at the Top or
Bottom.
(1) If Folding or Curling is observed at the Bottom of
the Take-up Guide then slowly turn the Tilt
Adjustment Screw(C) in the Clockwise direction.
(2) If Folding or Curling is observed at the Top of it then
slowly turn the Tilt Adjustment Screw(C) in the
Counterclockwise direction.
Check the RF Envelope after adjusting the A/C Head, if
the RF Waveform differs from Fig. C-5-4, performs
Precise Adjustment to flat the RF Waveform.
Test Equipment/ Fixture
• Oscilloscope
• Alignment Tape(SP)
• Screw Driver(+) Type 5mm
Connection Point
• Audio output jack
Test Conditions
(Mechanism Condition)
• Play an Alignment Tape
1KHz, 7KHz Sections
Adjustment Point
• Azimuth Adjustment Screw(A)
• Height Adjustment Screw(B)
1) Connect the Probe of the Oscilloscope to Audio Output
Jack.
2) Alternately adjust the Azimuth Adjustment Screw(A) and
the Tilt Adjustment Screw(C) for Maximum Output of the
1Khz and 7Khz segments, while maintaining the flattest
Envelope differential between the two Frequencies.
Adjustment Procedure
5-3. Precise Adjustment (Azimuth adjustment)
6. X-Value Adjustment
Fig. C-5-4
1KHZ
• Oscilloscope
• Alignment tape(SP only)
• Screw Driver(+) Type 5mm
• CH-1: PB RF Envelope
• CH-2: NTSC: SW 30Hz
PAL: SW 25Hz
• Head Switching Output
Test Point
• RF Envelope Output Test
Point
Test Conditions
(Mechanism Condition)
• Play an Alignment Tape
Adjustment PointConnection PointTest Equipment/ Fixture
Adjustment Procedure
1) Release the Automatic Tracking to run long enough for
Tracking to complete it’s Cycle.
2) Loosen the Fixed Mounting Screw and move the Base
Assembly A/C Head in the direction as shown in the
Diagram to find the center of the peak that allows for the
maximum Waveform Envelope.
This method should allow the 31um Head to be centrally
located over the 58um Tape Track.
3) Tighten the Base Assembly A/C Head mounting Screw.
7KHZ
A:Maximum
B:Maximum
Left
Right
Groove at the
Base A/C
Height Adjustment Screw(B)
Tilt Adjustment Screw(C)
Azimuth Adjustment
Screw(A)
X-Value Adjustment Hole
Fixed Screw
RF ENVELOPE OUTPUT TEST POINT
OSCILLOSCOPE
HEAD SWITCHING OUTPUT TEST POINT
Connection Diagram
Adjustment Diagram
NOTE:
CH-1
CH-2
DECK MECHANISM ADJUSTMENT
4-21
Purpose: To correct for shift in the Roller Guide and X value after replacing the Drum.
8-2.Check for tape curling or jamming
Test Equipment/ Fixture
• T-160 Tape
• T-120 Tape
Specification
• Be sure there is no tape jamming or curling at
the begining, middle or end of the tape.
VCR(VCP) State
•
Run the CUE, REV play mode at the
beginning and the end of the tape.
Test Conditions (Mechanism Condition)
1) Confirm that the tape runs smoothly around the roller
guides, drum and A/C head assemblies while abruptly
changing operating modes from Play to CUE or REV.
This is to be checked at the begining, middle and end
sections of the cassette.
2) Confirm that the tape passes over the A/C head assembly as indicated by proper audio reproduction and proper tape counter performance.
Checking Procedure
7. Adjustment after Replacing Drum Assembly (Video Heads)
Test Equipment/ Fixture
• Oscilloscope
• Alignment tapes
• Blank Tape
• Post Height Adjusting Driver
• Screw Driver(+) Type 5mm
Connection Point
• CH-1: PB RF Envelope
• CH-2: NTSC: SW 30Hz
PAL: SW 25Hz
• Head Switching Output
Test Point
• RF Envelope Output Test Point
Test Conditions
(Mechanism Condition)
• Play the blank tape
• Play an alignment tape
Adjustment Points
• Guide Roller Precise
Adjustment
• Switching Point
• Tracking Preset
• X-Value
Checking/Adjustment Procedure
Play a blank tape and check for tape curling or creasing around
the roller guide. If there is a problem then follow the procedure
4. "Guide Roller Height" and 5. "Audio Control(A/C) Head
Adjustment".
RF ENVELOPE OUTPUT TEST POINT
OSCILLOSCOPE
HEAD SWITCHING OUTPUT TEST
POINT
Connection Diagram
Waveform
V1/V MAX EE0.7
V2/V MAX EE0.8
RF ENVELOPE OUTPUT
Fig. C-7
8. Check the Tape Travel after Reassembling Deck Assembly.
8-1.Check Audio and RF Locking Time during playback and after CUE or REV (FF/REW)
Test Equipment/ Fixture
• Oscilloscope
• Alignment tapes(with 6H
3kHz Color Bar Signal)
• Stop Watch
Specification
• RF Locking Time: Less than 5
sec.
• Audio Locking Time:Less than
10sec
Test Equipment
Connection Points
• CH-1: PB RF Envelope
• CH-2: Audio Output
• RF Envelope Output Point
• Audio Output Jack
Test Conditions
(Mechanism Condition)
• Play an alignment tape
(with 6H 3kHz Color Bar
Signal)
Checking Procedure
Play an alignment tape then change the operating mode to
CUE or REV and confirm if the unit meets the above listed
specifications.
1) CUE is fast forward mode (FF)
2) REV is the rewind mode (REW)
3) Referenced to the Play mode
NOTES:
V1
V
V2
CH1 CH2
Connection Points
4-22
MAINTENANCE/INSPECTION PROCEDURE(FOR NORMAL MODELS)
(4) F/E Head
(3) P1 Post
(6) Drum Assembly
(Video Head)
(5) Base
Assembly P2
(2) Tension Post
(1) Supply Reel
(7) Base Assembly P3
The following faults can be remedied by cleaning and oiling. Check the needed lubrication and the conditions of
cleanliness in the unit.
Check with the customer to find out how often the unit is
used, and then determine that the unit is ready for inspection and maintenance. Check the following parts.
1 Check before starting repairs
Phenomenon Inspection
Replace-
ment
Color beats Dirt on full-erase head
o
Poor S/N, no color
Dirt on video head
Vertical or
Horizontal jitter
Dirt on Audio/control head
Dirt on pinch roller
If locations marked with o do not operate normally after
cleaning, check for wear and replace.
See the EXPLODED VIEWS at the end of this manual as
well as the above illustrations See the Greasing (Page 4-22)
for the sections to be lubricated and greased.
NOTE
o
o
o
o
Dirt on video head
Dirt on tape transport system
Low volume,
Sound distorted
Tape does not run.
Tape is slack
o
In Review and
Unloading (off mode),
the Tape is rolled up
loosely.
Clutch Assembly D33K
Torque reduced
Cleaning Drum and
transport system
Fig. C-9-3
(8) A/C Head
(9) P4 Post
(11) Pinch Roller
(12) Take-up Guide Post
(10) Capstan Shaft
(13) Take-up Reel
* No. (1)~(13) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel.
Fig. C-9-1 Top VIEW
Fig. C-9-2 BOTTOM VIEW
F/E Head
Video Head
A/C Head
Pinch Roller
Belt Capston
Clutch
Assembly D33K
Fig. C-9-3 Tape Transport System
MAINTENANCE/INSPECTION PROCEDURE(FOR JOG SHUTTLE MODELS)
4-23
(4) F/E Head
(3) P1 Post
(6) Drum Assembly
(Video Head)
(5) Base
Assembly P2
(2) Tension Post
(1) Supply Reel
(7) Base Assembly P3
The following faults can be remedied by cleaning and oiling. Check the needed lubrication and the conditions of
cleanliness in the unit.
Check with the customer to find out how often the unit is
used, and then determine that the unit is ready for inspection and maintenance. Check the following parts.
1 Check before starting repairs
Phenomenon Inspection
Replace-
ment
Color beats Dirt on full-erase head
o
Poor S/N, no color
Dirt on video head
Vertical or
Horizontal jitter
Dirt on Audio/control head
Dirt on pinch roller
If locations marked with o do not operate normally after
cleaning, check for wear and replace.
See the EXPLODED VIEWS at the end of this manual as
well as the above illustrations See the Greasing (Page 4-22)
for the sections to be lubricated and greased.
NOTE
o
o
o
o
Dirt on video head
Dirt on tape transport system
Low volume,
Sound distorted
Tape does not run.
Tape is slack
o
In Review and
Unloading (off mode),
the Tape is rolled up
loosely.
Clutch Assembly D33K
Torque reduced
Cleaning Drum and
transport system
Fig. C-9-3
(8) A/C Head
(9) P4 Post
(11) Pinch Roller
(12) Take-up Guide Post
(10) Capstan Shaft
(13) Take-up Reel
* No. (1)~(13) Indicates the Tape Path to be traveled from Supply Reel to Take-up Reel.
Fig. C-9-1 Top VIEW
Fig. C-9-2 BOTTOM VIEW
F/E Head
Video Head
A/C Head
Pinch Roller
Belt Capston
Clutch
Assembly D33K
Fig. C-9-3 Tape Transport System
MAINTENANCE/INSPECTION PROCEDURE
4-24
The recording density of a VCR(VCP) is much higher than
that of an audio tape recorder. VCR(VCP) components must
be very precise, at tolerances of 1/1000mm, to ensure compatiblity with other VCRs. If any of these components are
worn or dirty, the symptoms will be the same as if the part is
defective. To ensure a good picture, periodic inspection and
maintenance, including replacement of worn out parts and
lubrication, is necessary.
Schedules for maintenance and inspection are not fixed
because they vary greatly according to the way in which the
customer uses the VCR(VCP), and the environment in which
the VCR(VCP) is used.
But, in general home use, a good picture will be maintained
if inspection and maintenance is made every 1,000 hours.
The table below shows the relation between time used and
inspection period.
Table 1
(1) Grease : Kanto G-311G (Blue) or equivalent
(2) Isopropyl Alcohol or equivalent
(3) Cleaning Patches
(4) Grease : Kanto G-381(Yellow) : Used only for Reel S and
Reel T
(1) Cleaning video head
First use a cleaning tape. If the dirt on the head is too
stubborn to remove by tape, use the cleaning patch. Coat
the cleaning patch with Isopropyl Alcohol. Touch the
cleaning patch to the head tip and gently turn the
head(rotating cylinder) right and left.
(Do not move the cleaning patch vertically. Make sure
that only the buckskin on the cleaning patch comes into
contact with the head. Otherwise, the head may be damaged.)
Thoroughly dry the head. Then run the test tape. If lsopropyl Alcohol remains on the video head, the tape may
be damaged when it comes into contact with the head
surface.
(2) Clean the tape transport system and drive system, etc,
by wiping with a cleaning patch wetted with Isporopyl
Alcohol.
1 It is the tape transport system which comes into contact
with the running tape. The drive system consists of those
parts which moves the tape.
2 Make sure that during cleaning you do not touch the tape
transport system with the tip of a screw driver and no that
force is that would cause deforming or damage applied to
the system.
2.Required Maintenance
3.Scheduled Maintenance
5) Maintenance Procedure
5-1) Cleaning
NOTES:
About 1
year
One hour
Two hours
Three hours
When
inspection is
necessary
Average
hours used
per day
About 18
months
About 3
years
4.Supplies Required for Inspection and
Maintence
Fig. C-9-4
Drum
(Rotating Cylinder)
Head Tip
Coat With Isopropyl Alcohol
Touch this section of cleaning
patch to the head tip and gently
turn the Drum (Rotating Cylinder)
Cleaning Patch
MAINTENANCE/INSPECTION PROCEDURE
4-25
(1) Greasing guidelines
Apply grease, with a cleaning patch. Do not use excess
grease. It may come into contact with the tape transport
or drive system. Wipe any excess and clean with clean
ing patch wetted in Isopropyl Alcohol.
(2) Periodic greasing
Grease specified locations every 5,000 hours.
5-2) Greasing
NOTE:Greasing Points
1)Loading Path Inside & Top side
2)Base Tension Boss inside Hole
3)Arm Assembly F/L"U" Groove
4)Arm Take-up Rubbing Section
5)L/D Motor Worm Wheel Part
6)Shaft
7)Arm Assembly F/L of Buming
Inside Hole
8)Reel S, T Shaft (G381:Yellow)
9)Brake T Groove
Gear Assembly Up/D
Gear Drive
Gear Sector
Gear Cam
Press
Cam Part
Cam Part
Gear Part
Stopper Part
Bracket Side (L)
Bracket Assembly Door
1) Loading Path Inside & Top side
2) Shaft
3) Gear Rack F/L Moving Section
4) Shaft
5) Lever Tension Groove
6) Clutch Assembly D33 Shaft
7) Brake "S" Rubbing Section
Chassis (Top)
Chassis (Bottom)
Guide Rack F/L Gear Rack F/L
Side
Bottom
inside
Bottom
Cam &
Gear Part
Cam Part
Cam Part
Gear Part
1
2
3
8
4
5
6
9
7
2
3
1
4
5
76
Guide Rail
Plate Slider (Top)
Plate Slider (Bottom)
MECHANISM TROUBLESHOOTING GUIDE
4-26
Auto REW doesn't work.
Is the output of END sensor
of supply side "H"?
“H”: more than 3.5V
“L”: less than 0.7V~1V
Is the voltage across IR LED
between 0.8~1.5V?
Replace LED.
Is the Vcc. voltage of End
sensor 5V?
Check the syscon power.
Replace End sensor.
Check syscon circuit.
NO
YES
YES
YES
NO
NO
NO
1.Deck Mechanism
A.
NO
NO
NO
No F/R modes.
Is the present mode,
F/R Mode?
Is the mode SW assembled
correctly (refer to Pages 4-14.)
Is the normal voltage supplied to
the Capstan Motor Vcc1, Vcc2.?
Does terminal voltage(Vctl) of
Capstan Motor supply side
more than 4V?
Check Servo, Power Circuits.
Replace the Capstan Motor.
Does the Capstan Motor rotate?
Do the T/Up, Supply Reel
rotate?
Check syscon circuit.
YES
YES
YES
YES
YES
YES
B.
MECHANISM TROUBLESHOOTING GUIDE
4-27
AUTO STOP.
(PLAY/CUE/REV)
Are there T/up and supply reel
pulses.
In Play/Cue/Rev is the pinch
roller in contact with the capstan
shaft.
Replace Reel Sensor.
Is the output of DFG, DPG OK?
Check aligment positions (page 4-
14) Check spring Pinch.
Replace Drum Motor.
Check Servo, Syscon.
Check the Syscon, µ-COM.
No cassette loading.
Insert the cassette.
Check Cassette Carry Assembly.
Is there variation for F/L S/W
Output?
(In Tape with REC Tab
“L”→“H”→“L”)
(In Tape without REC Tab
“L”→“H”→“L”→“H”)
Does the F/L S/W work normally?
Does the lever S/W work
normally.
Check Syscon Circuit.
Check Syscon Circuit.
Replace F/L S/W.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
C.
D.
MECHANISM TROUBLESHOOTING GUIDE
4-28
In PB mode Tape Presence
not sensed.
Is the Pinch Roller attached
to the Capstan Motor Shaft?
Check Alignment positions
(page 4-14)
Does the T/Up
Reel turn?
Replace the Belt.
Is the Belt ok?
Does the Drum
Motor turn?
Are there DPG,
DFG Pulses?
Are the T/Up Supply Reel Sensors
ok?
Check Syscon,
Circuit.
Check Syscon,
Circuit.
Check Servo, Syscon.
Does the Capstan Motor turn?
Is the terminal voltage of the
Drum Motor more than 2.3V?
Replace the
Drum Motor.
Is the Vcc voltage of the Drum
Motor normal?
Check the clutch and the Idler
Assembly.
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Is the terminal voltage of Capstan
Motor supplied more than 4V?
Replace the
Capstan Motor.
Is the Voltage supplied to the
Capstan Motor Vcc1,Vcc2 each?
YES
YES
YES
Check Servo,
Power.
NO
NO
NO
E.
MECHANISM TROUBLESHOOTING GUIDE
4-29
Cassette cannot be inserted.
Does the Lever Switch work?
Is the Lever Switch Spring
damaged or omitted?
Does the F/L switch work
normally?
Replace or add the
Lever Switch Spring.
Is the Vcc of Main P.C.Board
5V?
YES
YES
Check syscon circuit.
YES
Check power circuit.
NO
Is the voltage between cassette
switch and GND on Main
P.C.Board 5V??
YES
Is there a short circuit between cassette
switch and GND on main P.C.Board?
Remove the short circuit part or
Replace the main P.C.Board.
NO
Check Mode switch location and
syscon circuit.
Replace F/L Switch.
YES
NO
YES
NO
NO
Replace F/L Switch.
NO
NO
Cassette will not eject.
Does the L/D motor rotate in reverse?
Check L/D Motor or Drive IC.
Replace lever Switch.
Does the Lever Switch work?
YES
NO
NO
Does the Arm Assembly F/L work normally?
YES
NO
Does the Opener Door work?
YES
Replace Arm Assembly F/L.
Replace the Opener Door.
2. Front Loading Mechanism
A.
B.
MECHANISM TROUBLESHOOTING GUIDE
4-30
Cassette will not load.
Does the CST insert?
Does the opener Lid work?
Is the opener Door assembled correctly?
Replace the Opener Lid.
Replace the Arm Assembly F/L.
Check the power of L/D Motor.
Is the Holder Assembly Cassette
assembled correctly?
Replace the Rear Rack F/L.
Does the Gear Rack F/L work?
Does the Opener Door work?
Does the Arm Assembly F/L work?
Does the L/D Motor work?
Does the Holder Assembly Cassette
move the Arm Assembly F/L?
Replace the Front Loading
Mechanism Assembly.
YES
YES
YES
YES
NO
NO
NO
YES
NO
YES
NO
YES
NO
C.
EXPLODED VIEWS
4-31
1. Front Loading Mechanism Section
A24
(Only for NETEE Models)
Optional Parts
118
101
426
116
115
112
113
114
110
104
105
106
107
103
117
A21
100
032
A23
109
108
A22
(Only for NETEE Models)
111
Optional Parts
426
EXPLODED VIEWS
4-32
2. Moving Mechanism Section(1)
031
Optional Parts
406
024
(For Normal Models)
024
(Only for Jog-shuttle Models)
504
019
017
003
(Only for 2HD Models)
018
023
011
012
022
003
(Only for 4HD Mono Models)
014
Optional Parts
003
(Only for 4HD Hi-Fi Models)
004
Optional Parts
(Only for VCR Models)
001
016
409
401
401
002
401
A01
A03
406
406
032
504
028
021
020
009
015
027
013
007
006
029
025
A04
026
EXPLODED VIEWS
4-33
3. Moving Mechanism Section(2)
060
054
053
426
410
032
(Only for
Hi-Rewind Models)
Optional Parts
063
Nomal Models)
062
(Only for
519
062
056
077
061
055
517
057
518
518
064
058
066
059
067
052
051
(Only for 4HD Models)
A14
Optional Parts
078
079
075
426
074
076
072
071
070
(Only for Jog-Shuttle Models)
426
Optional Parts
A13
069
065
A11
068
A12
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