Page 1
1-2
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
LG L316
Page 2
1-3
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.
9. The internal wiring is secured so as not to approach the heating parts and high voltage parts by its shape.
So, these wires must be restored to its former state.
IMPORTANT SAFETY PRECAUTIONS
Fig. 1
Power code
Page 3
1-4
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.
Chassis
d
a
Primary circuit terminals
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 A peak
i E 2m A DC
i E 0.7m A peak
i E 2m A DC
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
Exposed
accessible
part
Load
Z
Earth Ground,
Power cord plug prongs
B
AC Voltmeter
Page 4
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
Page 5
1-6
PREDICTED ERRORS OF MODULATOR & HOW TO COPE WITH THEM
CONTENT
Handle RF OUT CH by each region
For G : 30 ~ 40 ch
For I : 30 ~ 40 ch
30 ~ 40 ch
For G/K : 30 ~ 40 ch (G-initial for Australia)
30 ~ 40 ch (K-initial for CIS)
30 ~ 40 ch (G-initial for Southeast asia)
PREDICTED ERRORS
1. In RF Inteference, it is impossible to control from the outside.
2. After forwarding models with G/K system for G/K, it is difficult to change system.
HOW TO HANDLE
1. To subdivide CH according to model and region.
2. To adjust CH or System after open the top case.
Page 6
1-8
SPECIFICATIONS
General
Power.................................... AC110~240V, 50/60Hz
Power consumption .............. Approx. 10 Watts
Dimensions (W x H x D) ....... 360 x 94 x 230 mm
Weight................................... Approx. 3.0 Kg.
Operating temperature.......... 5 ~ 35°C
Operating humidity................ Less than 80%
Video
Television system.................. CCIR standard (625 lines, 50 fields), PAL/SECAM colour signal
Recording format .................. PAL/MESECAM/NTSC3.58/NTSC4.43
RF OUT................................. PAL/SECAM(G or K)
Input level.............................. 1.0Vp-p, 75 Ohm, unbalanced
Output level .......................... 1.0Vp-p, 75 Ohm, unbalanced
RF modulator ........................ UHF channels 32~40 (adjustable)
Audio
Input level.............................. -6 dBm, more than 47 kOhms
Output level........................... -6 dBm, less than 1.5 kOhms
Audio track ........................... Mono track
Audio frequency response .... 100 Hz ~ 10kHz(-6/+3 dBm)
• Design and specifications are subject to change without notice.
Page 7
2-1
SECTION2 CABINET & MAIN FRAME
Fig.2-1
SERVICE METHOD
(1) Disassembly Flow
(Positioned Upside Down)
(2) Re-assembly Flow for service like Fig. 2-1
(3) To check and replace Electrical parts
1 Disassemble the unit according to
No.1) Disassembly Flow.
2 Re-assemble the unit according to
No.2) Re-assembly Flow.
3 Place the unit like Fig. 2-1
4 Check and replace Electrical parts.
NOTE :
1 Insert Video Cassette Tape inversely like Fig. 2-1
to check and replace defective parts.
2 In disassembling and reassembling, be careful not
to damaged CST switch.
Top Case
Bottom Cover
Front Panel
Housing & Deck
Assembly
Main C.B.A
LED C.B.A
LED C.B.A
Main C.B.A
Housing & Deck
Assembly
Housing y Mecanismo
Cassette Tape
(Upside Down)
C.B.A Princioal
Page 8
2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
283
280
284
261
260
457
A00
464
462
462
250
300
A43
330
452
457
320
A46
A42
A49
A
5
4
3
2
1
BCD
NOTE) Refer to “SECTION 5 REPLACEMENT
PARTS LIST” in order to look for the
part number of each part.
_ OPTIONAL PARTS
Page 9
2-4
2. Packing Accessory Section
• Packing Accessory Section Part List
801
808
INSTRUCTION ASS'Y
BATTERY
810
CABLE SET ASS'Y
803
PACKING ASS'Y
804
SHEET CUSHION
802
BOX CARTON
(Optional Parts)
900
REMOCON
Page 10
3-13-1
Hi-Fi
AVCP
U-COM
S
M
P
S
SYSTEM
A/V
DECK CNT.
A/V JACK
M
O
D
U
L
A
T
O
R
MODULATOR
SMPS
DISP
KEY
BOARD(L)
KEY
BOARD(R)
: Measurement point
: Adjustment point
SECTION 3 ELECTRICAL
ELECTRICAL ADJUSTMENT POINTS ARRANGEMENT
Page 11
3-23-2
Fig. 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
SP TAPE PLAY
• Adjustment Procedure and Caution
a) Insert the PAL SP Test Tape and play.
Note - Adjust the distance of X, pressing SET REC KEY and “OK” on RCU simultaneously. (3SEC
HOLD). In ININTIAL MODE, LED of POWER/CST IN/LP/EP/STANDBY is on .(TRK PRESET
MODE)
b) In TRK PRESET MODE,Pressing SET REC KEY and “OK” on RCU same, and then PG is adjusted
automatically. (LED of PLAY/REC is off.)
c) Connect the CH1 of the oscilloscope to the H/SW(W373, W374) and CH2 to the Video Out for the VCR.
d) Trigger the mixed Video Signal of CH2 to the CH1 H/SW(W373, W374), and then check the distance
(time difference), which is from the selected A(B) Head point of the H/SW(W373, W374) signal to the
starting point of the vertical synchronized signal, to 416 µsec ± 32 µsec.
• WAVEFORM
• CONNECTION
V.Out Jack
H/SW(W373, W374)
AUTO
PAL PG : 416 ± 32usec
NTSC : 412 ± 32usec
MEASUREMENT POINT ADJUSTMENT POINT SPECIFICATION
t=416 µ sec ± 32 µ sec
VIDEO
OUT
CH-1 CH-2
W373/W374
Page 12
3-33-3
• Caution and Refrence
1. PG Adjustment is operated when SERVO SYSTEM is in LOCKING, maximum of RF LEVEL.
2. Distance difference of A/B HEAD is within ± 32usec.
3. Difference of Adjustment Requirement and Test is within ± 32usec.
H/SW
Composite
VIDEO
6.5H(416usec±32usec)
Page 13
3-4
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power Circuit(SMPS)
(1) No 5.3VA.
No 5.3VA.
Is the F101 normal?
Is the BD101 normal?
Is the R101 normal?
Does the oscillation waveform appear at
the IC101 Pin 7?
Is there DC voltage at the IC101 Pin 3?
Is there about 2.5V at the IC103 Vref ?
Is the D106 normal?
Check the Main PCB 5.3VA/5.0V
Line short?
Replace the F101
(Use the same Fuse).
Replace the BD101.
Replace the R101.
Is Vcc(about 15~19V) permittable at the
IC101 Pin 3?
Check or Replace the D103.
Replace the IC102.
Replace the IC103.
Replace the D106.
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Page 14
3-5
Is the D109 normal?
Replace the D109.
Check 13VA/12VA Line of the
Main PCB short.
YES
YES
No 13VA.
Does 5.3VA work normally? Check whether 5.3VA is out of order.
YES
NO
NO
Is the D152 normal? Replace the D152.
Check or Replace the Motor Vcc.
YES
YES
No 12VA.
Does 13VA work normally? Check whether 13VA is out of order.
YES
NO
NO
7. Power Circuit(SMPS)
(2) No 13VA.
(3) No 12VA.
Page 15
3-6
1 Check the 13VA Line.
2 Check the Peripheral
Is about 5.5V put into the
Q155/Q157 Base?
Does the 13VA Line work normally?
Check or Replace the Q155/Q157.
YES
YES
NO
No 5V.
Is the Q156 Base “H”?
Is 5.3VA put into the Q155/Q157
collector?
Check the Power Control.
YES
YES
NO
NO
7. Power Circuit(SMPS)
(4) No 5V.
Page 16
3-7
2. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change
periodically?
Do the CTL pulses appear
at the IC501 Pin 58?
Is adjusting the height of
the CTL Head accurate?
Readjust the height of the
CTL Head.
Replace the IC501.
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Does the CFG waveform
appear at the IC501
Pin 49?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at the
IC501 Pin 62?
Replace the IC501.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
(2) When the Drum Motor
(2) doesn’t run.
Do the DPG/DFG Pulses
appear at the PMC01
Pin 11?
Check the Drum Motor
Ass’y.
Aren’t the foil patterns and
the Components between
IC501 Pin 47 and PMC01
Pin 12 short?
Replace the IC501.
Check Power.
Do the Drum PWM Pulses
appear at the IC501
Pin 29?
Aren’t the foil patterns and
the Components between
IC501 Pin 29 and PMC01
Pin 12 short?
Do the DPG/FG Pulses
appear at the IC501
Pin 47?
Do the Drum PWM Pulses
appear at the IC501
Pin 29?
Aren’t the connecting patterns and the Components
between IC501 Pin 29 and PMC01 Pin 12 short?
When the Drum Motor
doesn’t run,
Does 12VA appear at the
PMC01 Pin8?
Does DPG/DFG appear at
the PMC01 Pin 11?
Check the connector and
the Drum Motor Ass’y.
NO
YES
NO
NO
NO
NO
NO
YES
Page 17
3-8
Does the CFG signal appear at the
PMC01 Pin 1?
Does the PWM signal appear at the
IC501 Pin 28?
Does 2.8V appear at the PMC01 Pin 9?
Check the PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
the IC501 Pin 28?
Aren’t the foil patterns and Components
between IC501 Pin 28 and PMC01
Pin 9 short?
Does the CFG signal come into the
IC501 Pin 49?
Aren’t the foil patterns and Components
between IC501 Pin 28 and PMC01
Pin 9 short?
2. SERVO CIRCUIT
(3) When the Capstan Motor doesn’t run,
NO
NO
NO
YES
YES
YES
YES
When the Capstan Motor doesn’t run,
Does 12VA appear at the PMC01?
Replace the IC501.
YES
NO
NO
YES
Refer to “SMPS(CAPSTAN/12Volt)
Trouble Shooting”.
Aren’t the foil patterns and component
between IC501 Pin 49 and PMC01 Pin 1
short?
Check the Capstan Motor Ass’y.
NO
Page 18
3-9
3. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the Video Input
Jack.
(Line In Jack)
Does the Video signal
appear at the IC301 Pin 15?
Is 5V applied to the IC301
Pins 22, 47, 60, 84, 92?
Does the Video signal
appear at the IC301 Pin 29?
Does the Video signal
appear at the Emitter
terminal of the Q501?
Check the 5V Line.
(Power Circuit)
Is I2C BUS signal applied to
the IC301 Pins 73, 74?
Check C327. (AGC)
Replace the IC301.
Is there 5V on the Emitter
of Q501?
Replace the Q501.
Check the 5V Line.
(Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Page 19
3-10
3. Y/C CIRCUIT
(2) When the Y(Luminance) signal doesn’t appear on the screen in PB Mode,
Is 5V applied to the IC301
Pins 22, 47, 60, 84, 92?
Is the I2C Bus siganl applied
to the IC301 Pins 73, 74?
Does the normal RF signal
appear at the IC301 Pin 76?
Check the line of the 5.3V
Line. (Power Circuit)
Check the System Circuit.
(IC501 Pin 18)
Check the V.H.S/W level.
Replace the IC301.
Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’.
Is the V.H.S/W signal
applied to the IC301 Pin80?
Is V.H.S/W “H” about 4.5V
at the IC301 Pin 80?
Clean the Drum.
Check the path of the
Y(Luminance) RF signal.
Check the path of the
Y(Luminance) RF signal.
Does the Y(Luminance) RF
signal appear at the IC301
Pin 33?
Is the Y(Luminance) Video
waveform showed up at the
IC301 Pin 49?
Replace the IC301.
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Page 20
3-11
3. Y/C CIRCUIT
(3) When the C(Color) signal doesn’t appear on the screen in PB Mode,
Is 5V applied to the IC301
Pins 22, 47, 60, 84, 92?
Does the oscillation signal
appear at the IC301
Pin 67, 71 ?
Check the line of the 5.3V
Line. (Power Circuit)
Replace the X301 or
the X302.
Check the Color Pass.
(Check the C347)
Replace the IC301.
Does the X301(3.58MHZ)
or X302(4.43MHZ) oscillate?
Check the circuit of the
IC301 Pins 55, 46, 45.
Does the Color signal
appear at the IC301 Pin42?
Replace the IC301.
NO
YES
YES
NO
NO
NO
YES
Page 21
3-12
3. Y/C CIRCUIT
(4) When the Video signal doesn’t appear on the screen in REC Mode,
Is the EE signal normal?
Is 5V applied to the IC301
Pins 22, 47, 60, 84, 92?
Does the RF signal appear
at the IC301 Pin 86?
Check EE Mode.
Check the System of REC
‘H’. (Q303 Base/IC501
Pin 22)
Replace the IC301.
Check the line of the 5.3V
Line.(Power Circuit)
Check PB Mode.
Is the REC ‘H’ signal
(about 4V) applied to the
Q303 Base?
Check the circuit of the
IC301 Pins 85, 86, 87.
Check REC Luminance
Pass & Color Pass.
Does PB Mdoe operate
normally?
Does the REC RF signal
appear at the IC301
Pins 86 ?
Check the Drum &
Drum Connector
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
Page 22
3-13
4. AUDIO CIRCUIT
(1) No sound in EE Mode
No sound in EE Mode.
No sound.
Is 5V applied to the IC301 Pin 92?
Is the Audio signal applied to the
IC301 Pin 4?
Does the Audio signal appear at the
IC301 Pin 6?
Check the connection of the Audio
out Jack.
Does the CLK/Data signal(I2C)
appear at the IC301 Pins 73, 74?
Replace the IC301.
Check the line of the 5V Line.
(Power Circuit)
Check the path of LINE/AUDIO.
Is the Audio Mute “High” signal applied
to the IC301 Pin 79?
Check the IC501 Pin 10.
(Audio Mute “H”.)
Check the circuit line of the 5V Line.
(Power Circuit)
Check the IC501 Pin 13 (CLK),
12 (Data) Line.
Check the connecting state between the
P3D02 Pin 6 and A/C Head.
Is the Audio Mute “H” applied to the
IC301 Pin 79?
Check the IC501 Pin 10.
YES
YES
YES
YES
YES YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
(2) No sound in PB MODE
No sound in PB Mode.
No sound.
Is 5V applied to the IC301 Pin 92?
Does the CLK/Data signal(I2C) appear at
the IC301 Pins 73, 74?
Does the Audio signal appear at the
IC301 Pin 95?
Does the Audio signal appear at the
IC301 Pin 6?
Replace the IC301.
NO
Check the IC501 Pin 13(CLK),
12(Data) Line.
NO
NO
NO
NO
NO
NO
NO
Page 23
3-14
3. Y/C CIRCUIT
(3) No sound in REC Mode,
No sound in REC Mode,
Sound is not recorded.
Is the Audio signal applied
to the IC301 Pin 4?
Refer to “No sound in PB
Mode,”.
Check the CLK/Date line
and replace the IC301
Check the path of Line
Audio.
Is the “High” signal applied
to the IC301 Pin 79?
Check the IC501 Pin 10
(Audio Mute “H”).
Replace the FL301 or the
Q301.
Check the line of the 5V
Power Circuit.
Check the Audio R/P/E
connector and Head.
Is Playback O.K.?
Does the Audio waveform
appear at the IC301 Pin 98?
Is 5V applied to the FL301
Pin 2 ?
Is 3.0~4.5V applied to the
Collector of the Q301 ?
Does the Erase signal
appear at the FL301 Pin 5?
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
Page 24
3-15
5. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
(2) The unstable loading of a Cassette tape
Auto Stop
Does the SW30 waveform
appear at the IC501
Pin 18?
Do the T-UP Reel Pulses
appear at the IC501 Pin 3?
Is 12V applied to the
PMC01 Pin 8?
Check the Drum Motor
signal.
Does 5.0V appear at the
RS501?
Check the Q157 Power
Circuit.
Refer to “SMPS CAPSTAN
12 Volt Trouble Shooting”.
Is 5.3V applied to the
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
Check the IC501
Pins 66, 67, 60, 69.
Do T/UP Reel Pulses
appear at the Q514
Base terminal ?
Replace the T/UP Reel
Sensor (RS501).
Check the CST SW and
the peripheral circuitry.
Replace the IC501.
The unstable loading of a
Cassette tape
Does the “H” signal appear
at the IC501 Pin 27 during
inserting the CST ?
Does the “H” signal appear
at the IC501 Pin 14 during
inserting the CST?
Check the Deck
Mechanism.
Caution :
Auto stop can occur because Grease or Oil is dried up
YES
YES
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO NO
YES
YES
YES
Page 25
3-16
KEY doesn’t working.
Is 5VA applied to the IC501
Pin 55?
Does OSD display change
when a function button is
pressed?
Refer to “SMPS 5.3VA
Trouble Shooting”.
Replace the defective
switches.
YES
NO
NO
(3) KEY doesn’t working
Page 26
3-17 3-18
BLOCK & CIRCUIT DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM
R101
C103
D151
J152
(MONO OPTION)
+
TO SYS
12VA(Cap)
D152
NOTES : Symbol denotes AC ground.
Symbol denotes DC chassis ground.
F101
R107
!
!
C112C113
HOT GND
!
!
!
4
3
2
6
4
7
9
8
10
11
3
1
2
IC102
IC103
!
BK
(BR)
WH
(BL)
PW101
!
TO SYS
13VA(DRUM)
TO Hi-Fi BUFFER
13VA
TO AVCP, OSD
5.1V
TO SENSOR MOD
5.1V
TO SYS, MOD
5.3VA
FROM SYS
P.CTL "H"
BD101
LINE FILTER
BLOCK
(C101, L102, C102)
DRIVE & S/W
BLOCK
(IC101, C109, D103, R103, C129,
R109, R125, R126, C135, BC101)
RECTIFIER &
SMOOTHING
(C116, D106,
L103, C117)
5V S/W
BLOCK
(Q155, R156, R157)
5V S/W
BLOCK
(Q157, R170, R171)
PWR CTL
BLOCK
(Q156, R161)
FEED-BACK
BLOCK
(R116, R117, R118,
R119, R120, R121,
C114)
RECTIFIER &
SMOOTHING
(D109, C120,
L104, C121)
12 REG BLOCK
(Q152, ZD152, C155,
Q162, C152, R152)
SNUBBER
BLOCK
(D102, R104,
C105, C106)
T101
TRANSFORMER
HOT CIRCUIT
Hi-Fi
OPTION
Page 27
3-19 3-20
2. Power(SMPS) Circuit Diagram
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.
F101 is defective.
Power dead.
IC101 is defective.
Switching dead.
IC102, IC103 are
defective.
Switching error
D105 is defective.
36VA Power dead.
D109 is defective.
12VA Power dead.
D106 is defective.
5.4VA Power dead.
BD101,R101 are
defective.
Power dead.
NOTES) Symbol denotes AC ground.
NOTES) Symbol denotes DC chassis ground.
NOTES) Warning
NOTES) Parts that are shaded are critical
NOTES) With respect to risk of fire or
NOTES) electricial shock.
Page 28
3-21 3-22
3. MODULATOR CIRCUIT DIAGRAM
Page 29
3-23 3-24
4. AUDIO BLOCK DIAGRAM(MONO MODEL ONLY) 5. Y/C BLOCK DIAGRAM
1) PB Mode
2) REC Mode
1) PB Mode
2) REC Mode
IC301
HA118717
VCA
DET
AMP
PB EQ
AMP
6
96
R/P HEAD
AUDIO OUT
V.H/SW30
System
(FROM u-COM)
V.ENV
(TO u-COM)
SP CH1
SP CH2
EP CH1
EP CH2
80
83
85
REC-AMP
86
REC-AMP
87
89
REC-AMP
90
REC-AMP
91
SP CH2
SP CH1
EP CH2
EP CH1
IC301
HA118725
76 77
System
System
X301 X302
67 69
X-tal
VCO/OSC
ACC
2M LPF
TRAP
629K
C LPF DEALY
FM AGC P.EQ G.EQ D LIM Y LPF
10
CTL Trap
fh Trap
HIFI Trap
DATA
(FROM u-COM)
Serial Cont
interface
CLOCK
(FROM u-COM)
73 6574
DEMO
S LPF
57 45 43 4271 46
C-CCD
6dB
AMP
CLOCK Drive
C-
SQUELCH
CLAMP
APC/ACC
DET
BDBPF
YNR NC
LPF
LPF
C.K
SYNC SEP
Sharpness
CONTROL
3640383733 35
+
+
VCA
Main
De-Empf
CCD LPF
98
L- DET
Main
Conv2
Main
Conv1
NL
De-eMPH
CLAMP
Y-CCD
MIX
AMP
SQUEL CH
CLEAR
SYNC
FBC
Video ALC
55
53
49
51
V. OUT
29
(TO u-COM)
28
(FROM u-COM)
31
30
32
D-V SYNC
System
System
(From REAR Jack)
A.IN
System
System
DATA
CLOCK
(FROM u-COM)
REC
AMP
VCA
AMP
4
DET
IC301
HA118717
98
6
R/P HEAD
AUDIO OUT
System
System
V. OUT
(TO u-COM)
D-V SYNC
(TO u-COM)
46
SQUEL CH
CLEAR
SYNC
FBC
Video ALC
VIDEO
AGC
ATT
-10dB
IC301
HA118725
HPF
AGC DET
LPF
APC/ACC
DET
SPFACC
CLAMP
D.E.
CLAMP
C-CCD
55
CLOCK Drive
53
49
Y-CCD
51
6dB
29
AMP
28
30
32
ATT
ATT
-10dB
-10dB
19
15 17 18 36 40 38 37 23 26 14 9 8 11
+
+
++
LINE 1
VIDEO IN
YNR
Main
Conv2
Main
Conv2
C-LPF 1
NL Emph
SYNC
SEP
57
45 7365 74 6967
JCA
(-4dB)
C-LPF 2
L-DET
CCD
LPF
FBC
Main
ALC
Emph
(FROM u-COM)
Serial Cont
interface
f0=1.68M
REC
MIX
B.E
C.K
FM
MOD
f/0DEV
Adjst
ATT
REC FILTER
Trap
X-tal
VCO/OSC
LPF
629K
TRAP
71
V.H/SW30
System
80
85
REC-AMP
SP CH2
86
REC-AMP
SP CH1
87
VCA
89
REC-AMP
EP CH2
90
REC-AMP
91
EP CH1
(FROM u-COM)
SP CH1
SP CH2
EP CH1
EP CH2
Page 30
3-25 3-26
6. A/V CIRCUIT DIAGRAM
1
2
4
7
3
6
3
3
9
12
13
8
59
10
11
WAVEFORM
Y. (REC)
C. (REC)
Y(PB)
Y/PB
C/PB
Y+C (PB)
C(PB)
Y+C (REC)
H/SW Level is defective..
Video Noise.
R333, C357, C358 are defective.
No Color.
L307, C349 are defective.
No Color.
R329 is defective.
No Color.
C332 is defective.
Video output level unstable
R322, R323, R324,
C320 are defective.
VIDEO Distortion
Page 31
3-27 3-28
22
25
PB FM
28
AMP
AMP
AMP
TO µ-COM
A.ENV
LINE OUT (R)
LINE OUT (L)
MOD. OUT
IC801
LA72634M
AGC
DET
R CH
BPF
L CH
BPF
SW.N.C
OUT
PUT
SELEC
TOR
AMP
ENV.
DET.
19
17
56
57
58
PNR
SW.N.C PNR
LIMIT
VCO
LPF
LINEI A.R
LINEI A.L
IC801
LA72634M
52
61
PNR/
AGC
LIMIT
VCO
LPF
PNR/
AGC
NORMAL A. OUT
TO IC301
Hi-Fi
HEAD
INPUT SELECTOR
26
53
7. Hi-Fi BLOCK DIAGRAM (Hi-Fi MODEL ONLY)
(PB MODE) (REC MODE)
Page 32
3-29 3-30
8. Hi-Fi CIRCUIT DIAGRAM (Hi-Fi MODEL ONLY)
Page 33
3-31 3-32
9. SYSTEM BLOCK DIAGRAM
Page 34
3-33 3-34
10. SYSTEM CIRCUIT DIAGRAM
WAVEFORM
VR501 is defective.
PB, PG will not operate.
RS501, RS502, Q514,
Q515 are defective.
Auto stop occurs.
R517 is defective.
OSD will not operate.
C576 is defective.
OSD will not operate.
C517 is defective.
OSD will not operate.
C512 is defective.
OSD is unstable.
R567 is defective.
OSD is unstable.
X501 is defective.
µ-COM will not operate.
Q501, Q503, L505 are
defective.
µ-COM is unstable.
ES501, ES502, LD501 are defective.
Tape mode not working.
(Taperemaing on reels)
Auto REW not working.
DOT MODEL
ONLY
Page 35
3-35 3-36
• WAVEFORMS
* IC301 Waveform Photographs
IC301 Pin 9
100mV/10msec DIV
VV/EE
(Main De-Emphasis out)
IC301 Pin 12
100mV/10msec DIV
PB
(Main De-Emphais
Peacking)
IC301 Pins 33, 36, 37
100mV/10msec DIV
VV/EE
Clamp Drive IN Pin 33
Y-out(to 1H CCD) Pin 36
Y-out(from 1H CCD) Pin 37
IC301 Pin 15
200mV/10msec DIV
EE
(VIDEO IN)
IC301 53 Pin
100mV/0.2msec DIV
REC/PB
(2fsc)
IC301 31 Pin
1.0V/20msec DIV
VV/EE
(C-SYNC OUT)
IC301 29 Pin
500mV/10msecDIV
VV/EE
(VIDEO OUT)
IC301 Pin 43
200mV/20msec DIV
PB
(C.OUT)
* IC501 Waveform Photographs
IC501 PIN 18
REC/PB MODE
1V/1msec
(V.H/SW)
IC501 PIN 19
QUE/REV MODE
1V/5msec
(DV.SYNC)
IC501 PIN 56
REC MODE
1V/5msec
(CTL+)
IC501 PIN 57
REC MODE
1V/5msec
(CTL-)
IC501 PIN 47
REC/PB MODE
1V/5msec
(DPFG)
IC501 PIN 49
REC/PB MODE
1V/2msec
(CFG)
IC501 PIN 40
EE/PB MODE
500mV/10usec
(CVin)
IC501 PIN 38
EE/PB MODE
500mV/10usec
(CVout)
IC301 Pins 46, 57
200mV/20msec DIV
VV/EE
from 1H CCD Pin 46
to 1H CCD Pin 57
IC301 Pin 67
100mV/0.2msec DIV
PB/REC
(3.58MHz X-TAL IN)
IC301 Pin 77
100mV/5msec DIV
PB
(PB RF out)
IC301 Pin 86
500mV/2msec DIV
SP REC
(REC RF)
IC301 Pin 90
500mV/2msec DIV
EP REC
(REC RF)
Page 36
• VOLTAGE SHEET
3-37 3-38
REC PB
MODE
PIN NO.
0.06
0.06
0.06
0.35
2.35
2.58
2.83
1.84
1.84
2.41
2.61
1.60
0.00
2.80
2.80
0.18
2.79
1.76
2.80
0.02
2.80
5.08
2.32
0.18
2.12
3.00
0.18
0.15
2.48
2.80
0.37
2.31
2.09
1.76
3.03
2.32
3.03
2.15
1.42
2.08
3.01
1.98
2.05
0.00
3.13
3.13
5.03
0.14
3.17
5.03
2.05
5.03
2.62
0.00
0.06
0.06
0.06
0.37
2.09
2.55
2.83
1.24
1.23
1.89
3.00
0.56
0.00
2.26
2.38
1.91
2.80
1.91
2.80
0.00
2.80
5.12
2.34
0.57
2.12
2.80
0.45
0.15
2.46
2.91
0.37
2.79
2.13
1.85
3.07
2.35
3.06
2.20
1.45
2.12
2.55
1.97
2.05
0.00
3.15
3.15
5.07
0.14
3.19
5.07
2.07
5.07
2.64
0.00
REC PB
MODE
PIN NO.
2.07
0.00
2.18
2.34
4.94
4.94
0.02
2.28
2.23
2.94
2.26
2.95
2.19
1.28
1.96
2.71
2.19
0.14
5.20
5.20
2.76
2.25
2.84
0.02
0.00
2.54
4.85
4.15
0.00
5.07
2.46
2.54
2.45
0.00
2.48
2.52
2.48
5.08
0.52
2.53
2.53
2.53
0.01
2.27
0.00
2.58
0.5
PULSE
PULSE
0
4.8
0.5
0.5
0.5
2.09
0.00
2.18
2.34
4.97
4.97
0.02
2.21
2.23
2.95
2.26
2.96
2.18
1.24
1.96
1.42
2.19
0.14
5.21
5.21
2.79
2.17
2.84
0.03
0.00
2.53
4.84
4.15
2.53
5.10
2.30
2.30
2.30
0.00
2.30
2.30
2.30
5.11
0.51
2.54
2.52
2.50
0.01
2.55
0.00
2.55
0.5
PULSE
PULSE
0
4.8
0.5
0.5
0.5
IC501
REC PB
MODE
PIN NO.
0
0
0
PULSE
PULSE
2.5
5.1
0
4.9
PULSE
0.1
5.1
PULSE
4.5
0
0
0
0
0
2.7
2.6
0
5.1
2.5(OSC)
2.3(OSC)
0
0.4(OSC)
0.4(OSC)
0
2.0(VIDEO)
0
2.0(VIDEO)
2.5(VIDEO)
5.0
2.9
2.5
0.9
0
PULSE
0.4
PULSE
0.6
2.5
2.5
0
2.5
5.1
PULSE
PULSE
2.5
5.1
5.1
0
0
0
0
0
0
PULSE
PULSE
2.5
5.0
0
4.9
PULSE
0.1
5.1
PULSE
0
0
0
0
0
5.0
2.7
2.6
0
5.1
2.5(OSC)
2.3(OSC)
0
0.5(OSC)
0.5(OSC)
0
2.0(VIDEO)
0
2.0(VIDEO)
2.5(VIDEO)
5.0
2.9
2.5
2.5
2.1
PULSE
0.4
PULSE
0.4
2.6
2.6
0
2.6
5.1
2.6
2.6
2.6
5.1
5.1
0
TAPE
REC PB
MODE
PIN NO.
0
0
5.2
5.2
5.2
0
0
0
0
5.1
0
5.1
5.1
0.6
0.5
0.5
0.37
0
2.48
1.96
2.48
0
0
0
0.22
2.48
2.5
2.49
2.52
5.03
2.51
2.49
0
4
4
4.87
0.23
4.09
0
2.45
4.09
4.02
2.35
0
2.52
5.03
5.18
5.18
0
0
2.54
5.03
2.51
0
0.1
5.2
5.2
5.2
0
0
0
0
0
5.1
5.1
5.1
0.6
0.5
0.5
0.37
0
2.5
2.5
2.5
0
0
0
0.17
2.47
2.48
2.48
2.52
5.06
2.48
2.47
5.11
2.77
2.77
4.98
1.3
2.03
0
0
2.03
2.03
0
0.24
2.57
5.07
5.18
5.18
0
0
2.54
5.06
2.43
IC801
REC PB
MODE
PIN NO.
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
2.51
2.51
2.52
2.51
0.21
0
0
2.49
1.97
2.48
0
0
2.48
5.04
0
1.52
2.48
0
4.31
4.46
4.31
0
9.15
0
9.15
0
2.48
2.42
2.44
2.45
2.44
0.73
0
0
2.51
2.43
2.5
0
0
2.5
5.07
0
1.66
2.5
0
4.34
4.48
4.32
0
9.14
0
9.14
0
2.5
IC301
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
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
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
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
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
REC REC REC
EMITTER COLLECTOR BASE
PB PB PB
Location
No.
Q5P1
Q5P2
Q5P3
Q5P4
Q5P5
Q5P6
Q505
Q501
Q502
Q5V1
Q514
Q515
Q503
0
0
0
0
0
0
0
3.0(VIDEO)
2.9(VIDEO)
0.3(VIDEO)
0
0
0
0.1
0.1
0.1
3.9
3.9
3.7
2.9
0
0
2.3(VIDEO)
PULSE
PULSE
3.0(VIDEO)
5.1
5.1
5.1
0
0
0
0.7
2.4(VIDEO)
2.4(VIDEO)
0
PULSE
PULSE
0
0
0
0
0
0
0
0
3.0(VIDEO)
2.9(VIDEO)
0.3(VIDEO)
0
0
0
0.1
0.1
3.9
0.1
3.9
3.7
2.9
0
0
2.3(VIDEO)
PULSE
PULSE
3.0(VIDEO)
5.1
5.1
0
5.1
0
0
0.7
2.4(VIDEO)
2.4(VIDEO)
0
PULSE
PULSE
0
MONO:0,
HIFI:TAPE
SP:0 ,LP/EP: 5.1
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