a. Unscrew the 2 screw holding the F/L.
b. Separate the F/L ASS`Y from the MAIN BASE settling
down point by lifting the rear part of F/L(Screw hole).
3.2 Disassembly of FRONT LOADING Ass’y
(FIg. 3.2~3.5)
a. Remove the one WASHER for holding the door opener
and separtate F/L Assembly by moving the DOOR
OPENER in the direction of arrow.
b. Remove the 2 screw holding the TOP PLATE and sepa-
rate the CASSETT HOLDER ASS`Y by moving the
FL BRKT L and FL BRKT R in the direction of arrow
(Fig. 3.2)
3. DISASSEMBLY AND REPLACEMENT
NOTE:
REMOVE THE FRONT LOADING ASS`Y IN EJECT
MODE
Fig. 3.1 Diassembly of the FRONT LOADING ASS`Y
Fig. 3.2 Diassembly of the FRONT LOADING ASS`Y
c. Separate the LOADING LEVER ASS`Y by pressing
the connection point from the CASSETTE HOLDER
ASS`Y.(Fig. 3.3)
d. Remove the SAFETY SPRING connecting the SAFETY
LEVER and CASSETTE HOLDER PLATE.(Fig. 3.3)
e. Remove the RELEASE SPRING connecting the
RELEASE LEVER and SAFETY LEVER.(Fig3.3)
3. 3 Disassembly of DRUM Ass’y (Fig. 3.5)
a. Turn over the DECK MECHANISM and holding the
DRUM TOTAL ASS`Y @ with hands , remove the 3
screw holding the drum total assembly with main base.
b. Separatet the DRUM TOTAL ASS`Y from the deck pay-
ing attention there is no damage on the surface of VIDEO
HEAD and DRUM.
c. Assembly step is the reverse way of diassembly.
DISASSEMBLY AND REPLACEMENT (CONTINUED)
CAUTION:
Assemble the FRONT LOADING ASS`Y in the reverse
step of diassembly. Confirm that two bosses on the left
side of the CASSETTE HOLDER ASS`Y are inserted in
the groove on the left side of the top plate. Insert two
bosses on the right side of the CASSETTE HOLDER
ASS`Y into the groove of the F/L BRACKET R.(Fig. 3.4)
FIg. 3.3 Disassembly of the CASSETTE HOLDER Ass’y
FIg. 3.4 Assembly of the FL Ass’y
CAUTION:
• After the assembly of the DRUM TOTAL ASS`Y,
check out if DECK mecahnism operate smoothly and
adjustment of tape transmission section is OK.
FIg. 3.5 Diassembly of DRUM ASS`Y
3. 4. Disassembly of LOADING RACK, LOADING
ASS’Y, S/T SLANT POLE ASS’Y (Fig. 3.6, 3.7)
a. Turn out the DECK MECHANISM and remove the
LOADING RACK @ after unscrewing the SCREW .
b. Disintegrate the R LOADING AS # and L LOADING
AS $ .
c. Disintegrate the S SLANT POLE AS % and T SLANT
POLE AS ^ by moving those part in arrow dircetion.
3. 5. Disassembly of the A/C HEAD ASS’Y (Fig. 3.8)
a. Remove the CONNECTOR @ from the AC HEAD
ASS`Y, Watch out that there is no damage in the HEAD
connecting PIN.
b. Separate the AC HEAD ASS`Y ! after unscrewing the-
screw #
DISASSEMBLY AND REPLACEMENT (CONTINUED)
CAUTION:
• Take care GUIDE ROLLER of S/T SLANT POLE AS
and SLANT POLE not to be stained with grease during
assembly.
• Refer to Fig. 3.7 in assembly.
FIg. 3.6 Disassembly of the LOADING RACK, LOADING
ASS’Y and the SLANT POLE ASS’Y
FIg. 3.7 Assembly of the L/R LOADING AS and the
LOADING RACK
CAUTION:
• After the assembly, adjust the tape transmissionsection by refering to the chapter 5.
• After the adjustment of the tape transmission section,
paint the 3 adjustment screw with locking paint.
FIg. 3.8 Disassembly of the AC HEAD ASS’Y
3. 6. Disassembly of the LC BRKT ASS’Y, PINCH
LEVER TOTAL ASS’Y (Fig. 3.9)
a. Separate the LC BRKT Ass’y @ after removing the 3
screws !.
b. Separate the LC BRKT Ass’y @ from the DECK
MECHANISM.
c. Disintegrate the PINCH LEVER TOTAL Ass’y #.
3. 7. Disassembly of the CAM GEAR, RELAY
LEVER, FL RACK (Fig. 3.9)
a. Separate the CAM GEAR % from the MAINBASE.
b. Separate the RELAY LEVER ^ from the MAINBASE.
c. Separate the FL RACK & from MAINBASE by moving
to the arrow direction.
DISASSEMBLY AND REPLACEMENT (CONTINUED)
CAUTION:
• After the assembly of the PINCH LEVER TOTAL
Ass’y, adjust the tape transmission section by refering to
the chapter 5.
• There should be no pollution on the surface of
PINCH ROLLER $ with grease or other foreign
material.
• Make sure if the end of the PINCH SPRINGPINCH
“A” is located at the end of trajectory of CAM GEAR
“B” in assembly (Refer to Fig. 4.3)
CAUTION:
• When reassembling, refer to Fig. 3.10, Fig. 3.11 and
chapter 4.
FIg. 3.9 Disassembly of the LC BRACKET ASS’Y from
the PINCH LEVER TOTAL ASS’Y
FIg. 3.10 Assembly of the CAM GEAR, RELAY LEVER
FIg. 3.11 Assembly of the CAM GEAR, FL RACK
3. 8 Disassembly of the S/T BRAKE ASS’Y(Fig. 3.12)
a. Unhook the S BRAKE SPRING # from the MAIN-
BASE HOOK !.
b. Remove the S BRAKE Ass’y @ from the mainbase.
c. Remove the T BRAKE SPRING ^ from the MAIN-
BASE HOOK $.
d. Remove the T BRAKE Ass’y %.
3. 9 Disassembly of the TENSION BAND ASS’Y
(Fig. 3.13)
a. Unhook the TENSION SPRING @ from the MAIN-
BASE HOOK !.
b. Unhook the MAINBASE HOOK “A” and remove the
TENSION BAND Ass’y # from the mainbase.
3. 10 Disassembly of the Capstan Motor (Fig. 3.13)
a. Separate the CAPSTAN MOTOR % after the removal of
3 screws $ holding the capstan motor.
3.11 Disassembly of the FE HEAD (Fig. 3.13)
a. Remove the screw ^ and separate the FE HEAD & from
the MAINBASE.
DISASSEMBLY AND REPLACEMENT (CONTINUED)
CAUTION:
• After the assembly of TENSION BAND Ass’y on the
mainbase, adjust the TENSION POLE location as
shown in Fig. 3.14.
• Avoid getting Grease, Oil or Foreign substance on the
FELT of the BAND BRAKE.
• Take care not to deform the MAINBASE HOOK “A”
when separating the TENSION BAND Ass’y #.
FIg. 3.12 Disassembly of the S/T BRAKE ASS’Y
FIg. 3.13 Disassembly of the TENSION BAND ASS’Y,
CAPSTAN MOTOR and the FE HEAD
FIg. 3.14 Adjustment of the TENSION POLE POSITION
3.12 Disassembly of the REEL T ABLE, IDLER
PLA TE T OTAL ASS’Y (Fig. 3.15)
a. Remove the POLY WASHER ! and separate the
IDLER PLATE TOTAL Ass’y @ from the mainbase.
b. Remove the REEL TABLE $ from the REEL TABLE
POST # of the MAINBASE.
3.13 Disassembly of the REEL BRKT TOTAL
ASS’Y, CONNECT PLATE (Fig. 3.16)
a. Turn over the DECK MECHANISM and remove 2
screws !.
b. Remove the REEL BRKT TOTAL Ass’y @ from the
MAINBASE.
c. Separate the CONNECT PLATE # from the MAIN-
BASE by pushing to the direction of the arrow.
DISASSEMBLY AND REPLACEMENT (CONTINUED)
CAUTION:
• Take care not to deform the IDLER PLATE TOTAL
Ass’y @ when assembling and disassembling.
CAUTION:
• In diassembly of the REEL BRKT TOTAL ASS`Y,
take care REEL BELT and REEL FELT not to be
stained with GREASE, OIL, or foreign substance.
• diassembly of the IDLER ASS`Y should be precede
the diassembly of the REEL BRKT TOTAL ASSY.
• Check the operation of the REEL BRKT TOTAL
ASSY before assembly.
• Check the operation of FF/REW, PLAY, CUE, and
REVIEW work well and existence of noise during
the mode operation..
FIg. 3.15 Disassembly of the REEL TABLE and the IDLER
PLATE TOTAL ASS’Y
FIg. 3.16 Disassembly of the REEL BRKT TOTAL ASS’Y
and the CONNECT PLATE
6.1 Exploded view of DECK Ass’y ( Top View)
6. EXPLODED VIEW
6. 2 Exploded view of DECK Ass’y ( Bottom View)
EXPLODED VIEW (CONTINUED)
6.3 Exploded view of FL Ass’y
EXPLODED VIEW (CONTINUED)
D0040
D0040
D0020
D0050
D0010
D0060
D0070
2.1.Assembly diagram
2.1.1.DECK Assembly diagram
A. Upper View
2. ASSEMBLY DIAGRAM AND A/S
1MAIN BASE ASS’Y
2 DRUM ASS’Y
3 FE HEAD
4 S SLANT POLE ASS’Y
5 TENSION BAND ASS’Y
6 S BRAKE ASS’Y
7 REEL TABLE
8 REEL BRKT TOTAL ASS’Y
9 IDLER PLATE TOTAL ASS’Y
10 T BRAKE ASS’Y
11 FL RACK
12 RELAY LEVER
13 CAPSTAN MOTOR
14 LC BRKT ASS’Y
15 PINCH LEVER TOTAL ASS’Y
16 CAM GEAR
17 AC HEAD ASS’Y
18 T SLANT POLE ASS’Y
19 LOADING RACK
20 L LOADING ASS’Y
21 R LOADING ASS’Y
22 CONNECT PLATE
23 REEL BELT
24 CABLE FFC
ASSEMBLY DIAGRAM AND A/S(CONTINUED)
B. Lower V iew
1MAIN BASE ASS’Y
2 DRUM ASS’Y
3 FE HEAD
4 S SLANT POLE ASS’Y
5 TENSION BAND ASS’Y
6 S BRAKE ASS’Y
7 REEL TABLE
8 REEL BRKT TOTAL ASS’Y
9 IDLER PLATE TOTAL ASS’Y
10 T BRAKE ASS’Y
11 FL RACK
12 RELAY LEVER
13 CAPSTAN MOTOR
14 LC BRKT ASS’Y
15 PINCH LEVER TOTAL ASS’Y
16 CAM GEAR
17 AC HEAD ASS’Y
18 T SLANT POLE ASS’Y
19 LOADING RACK
20 L LOADING ASS’Y
21 R LOADING ASS’Y
22 CONNECT PLATE
23 REEL BELT
24 CABLE FFC
ASSEMBLY DIAGRAM AND A/S(CONTINUED)
2.1.2.FRONT LOADING Assembly diagram
1 FL BRKT L
2 TOP PLATE
3 SAFETY LEVER
4 LOADING LEVER AS4
5 CST HOLDER AS
6 DOOR OPENER
7 SAFETY LEVER R
8 FL BRKT R
Fig.2
4. 1 Mechanical Adjustment (Fig. 4.1~4.4)
In case of diassembly and reassembly for fixing the mecanical
problem, check the following check point.
a. Make sure that the DATUM HOLE of the CAM GEAR is
aligned wth the DATUM HOLE in the MAINBASE in
the EJECT mode as shown in Fig. 4-1.
b. Make sure that the ending part “A” of the RELAY
LEVER assembled on the CONNECT PLATE is aligned
with the reference hole “B” of the MAINBASE as shown
in Fig. 4.2.
c. The end point “A” of PINCH SPRING PIN of the
LEVER TOTAL ASS`Y should be located within the
trajectory “B” of the CAM GEAR. (Fig. 4.3)
4. MECHANICAL ADJUSTMENT
FIg. 4.1 Assembly reference between the FL RACK and the
CAM GEAR
TURN TO THE END
ALIGN
FIg. 4.2 Assembly reference between the RELAY LEVER
and the CAM GEAR
FIg. 4.3 Assembly reference of the PINCH LEVER TOTAL
ASS’Ywith the CAM GEAR
d. Make sure that the triangular mark “A” of the L LOAD-
ING Ass’y is aligned with the mark “b” of the R LOADING Ass’y. (Fig. 4.4)
e. Reference hole “C” of the LOADING RACK should be
aligned with the reference hole of the R LOADING Ass’y
to make the teeth of the LOADING RACK is aligned as
shown in Fig. 4.4.
4. 2 Adjustment and measurement of the BACK
TENSION (Fig. 4.5, 4.6)
a. Check that the location of the TENSION POLE is in the
right position. if not, adjust that by refering to the “4.4
Adjustment of the TENSION POLE position”.
b. Play back the T-120 TAPE in S-MAX for 20
seconds.(Generally tape transporting section is settled
down in 20 seconds)
c. Measure the BACK TENSION by using the TENTELO
METER (Refer Fig 4.5) The result should be within the
range of 20g ~ 30g.
d. If the BACK TENSION is out of the range, change the
position of the TENSION SPRING of repeat the
process of “4.4 Adjustment of the TENSION POLE
position”.(Fig. 4.6)
MECHANICAL ADJUSTMENT (CONTINUED)
FIg. 4.4 Assembly reference between the LOADING RACK
and the LOADING LEVER ASS’Y
CAUTION:
• If the measurement result greater than the upper limit,
change the hook point of the spring to position “A”
• Confirm that all of the three probes of TENTELO
METER are in contect with the tape.
• During measuring, don`t touch any other parts of the
MECHANISM(i.e. MAINBASE). It is recommended that this measurment be repeated at least three
times for an accurate reading.
FIg. 4.5 Measurement of the BACK TENSION
4. 3 Mechanical Mode (Operate without a cassette
tape)
a. Remove the FRONT LOADING MECHANISM from the
DECK MECHANISM
b. Cap the IR LED and pull the FL RACK. This has the same
effect with cassette loading to the deck.
c. If the S,T POLE BASE is loaded, PLAY MODE starts
automatically. If you want other function, press the corresponding button.
d. Turn off the power when the Mechanism is in the desired
position.
4. 4 Adjustment of the position of the TENSION
POLE (Fig. 4.6)
a. Place the MECHANICAL MODE in the PLAY MODE.
Refer to the above section “4.3 MECHANICAL MODE”
b. Confirm that the TENSION LEVER is aligned with the
datum hole of the MAINBASE.
c. If the requirement “b” is not satisfied. turn the BAND
BRAKE ADJUST CAP clockwise or counterclockwise
until the two datum holes aligns with each other.
MECHANICAL ADJUSTMENT (CONTINUED)
FIg. 4.6 Adjustment of the TENSION POLE POSITION
5. ADJUSTMENT OF THE TAPE TRANSPORT SECTION.
Generally, tape transporting section has been precisely adjusted in the factory and does not require the ordinary readjustment.
But there is the case that tape noise or impact on the deck mechanism, tape transporting section readjustment is required. In
adjustment of the tape transmission section consut the following flow chart.
If any components shown in Fig. 5.1, tape transport section are changed. To readjust the tape transporting section.
FIg.5.1 A schematic diagram of the tape transport ing section.
S/T GUIDE ROLLER HEIGHT
ADJUSTMENT
•DRUM TOTAL AS
•A/C HEAD AS
•PINCH LEVER TOTAL
AS
S/T GUIDE ROLLER FLUNGE
A/C HEAD AS ADJUSTMENT (TILT ADJUSTMENT)
CLEANING
AUDIO AZIMUTH ADJUSTMENT
A/C HEAD ADJUSTMENT
X-POSITION ADJUSTMENT
PLAYBACK PHASE ADJUSTMENT
LINEARITY ADJUSTMENT
DRUM ENTRANCE/EXIT ENVELOPE FINE TUNING
REVIEWPLAY CHANGING OPERATION CHECK
AUDIO AZIMUTH ADJUSTMENT
AUDIO OUTPUT CHECK (A/C HEAD HEIGHT& TILT ADJUSTMENT)
X-POSITION ADJUSTMENT
TRACKING
•S SLANT PLOE AS
•T SLANT POLE AS
•TENSION BAND AS
Table.1 Adjustment Flow Diagram of the Tape Transporting System
A. Adjustment of the S/T GUIDE ROLLER
A. Adjustment of the S/T GUIDE ROLLER
a. Check the Playing back with a T-120 TAPE.
b. Make sure that excessive tape wrinkle does not occure
ateatch S, T GUIDE ROLLER.
c. If tape wrinkle is observed at the S/T GUIDE ROLLER,
turn the guide roller screw until there is not tape wrinkle.
B.Adjustment of the AC HEAD ASS’Y(TILT)
a. Play back a T-120 TAPE and check the running status of
lower side of GUIDE POST.
b. If there is any problem, Turn the AC HEAD TILT
SCREW until the running status improved. (Fig. 5.2)
C.Adjustment of the AC HEAD Height(Fig. 5.3)
a. Play back a T-120 TAPE..
b. Make sure that the gap between the lower end of TAPE
and the AC head is 0.25m.
c. If the measurement of the gap is different from the refer-
ence value 0.25mm, turn the screw ! , # until the
desired gap is obtained.
D.Adjustment of the AUDIO AZIMUTH(Fig. 5.4)
a. Play back the ALIGNMENT TAPE
(DN2 : SP, NTSC,7KHz)
b. Check the AUDIO output with a AUDIO LEVEL
METER.
c. Turn the AC HEAD AZIMUTH SCREW @ until the
maximum AUDIO output(-9dBm ~ -3dBm)is obtained.
E.Adjustment of the X-POSITION(Fig. 5.4 5.5)
a. Connect the PATH ADJ. FIXTURE to the PT01 on the
MAIN CIRCUIT BOARD.
b. Play back the ALIGNMENT TAPE (DN2 : SP MONO-
SCOPE).
c. Connect the S/W pin and ENVE pin of the PATH ADJ.
FIXTURE with the SCOPE PROBE.
d. Insert the adjustment bar in the AC HEAD ADJUST hole
$ and adjust the X-POSITION of the AC HEAD
ASS`Y until the ENVE is maximum when the VR is on
the CENTER.
• There is the possibility that an another TRACKING CENTER can be occur when the AC HEAD ASS`Y turned
completely in the counterclockwise direction, Hence adjust
the X-position with AC HEAD ASS’Y adhering closely
to the right side until the maximum ENVE is obtained.
e. The adjustment of the X-POSITION finished, check
if the AUDIO LEVEL is degraded, then readjustment
of the AUDIO AZIMUTH is required.
ADJUSTMENT OF THE TAPE TRANSPORT SECTION. (CONTINUED)
FIg.5.2 Adjustment of the AC HEAD ASS’Y
FIg.5.3 Adjustment of AC HEAD Height
FIg.5.4 Adjustment of AUDIO AZIMUTH, X-POSITION
S/W PULSE TEST PINPATH ADJ. FIXTURE
ENVELOPE TEST PINPATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROLPATH ADJ.FIXTURE
AC HEAD ADJUST HOLEADJUSTMENT BAR
Test Point
Adjustment
F. PLAYBACK PHASE ADJUSTMENT(Fig. 5.6)
PHASE GENERATOR(PG) SHIFTER determine the
VIDEO HEAD SWITCHING POINT when the TAPE is
played back. If an adjustment of the PHASE GENERATOR(PG) SHIFTER is not done precisely, There can be a
HEAD SWITCHING NOISE or a VERTICAL JITTER
problem, vibration of the picture on the screen, not good
quality of picture in special play back.
a. Connect the PT01 on the MAIN CIRCUIT BOARD with
a PATH ADJ. FIXTURE.
b.
Play back an ALIGNMENT TAPE(DN-2 : MON-SCOPE signal)
c. Connect the S/W PULSE TEST PIN on the PATH ADJ.
FIXTURE with a CHANNEL-1 SCOPE PROBE.
d. Connect the VIDEO OUT on the MAIN CIRCUIT
BOARD with a CHANNEL-2 SCOPE PROBE (1V/div).
e. Control the PG VOLUME until the time interval
between the SWITCHING PULSE and the V-SYNC
SIGNAL is within the 6.5H±0.5H as shown in Fig. 5.6.
G.Adjustment of the LINEARITY(Fig. 5.7)
a. Connect the PT01 on the MAIN CIRCUIT BOARD with
a PATH ADJ. FIXTURE.
b. Play back an ALIGNMENT TAPE(DN-2 : MONO-
SCOPE Signal).
c. Connect the FIXTURE S/W PULSE TEST PIN on the
PATH ADJ. CHANNEL-1 SCOPE PROBE.
d. Connect the VIDEO OUT on the MAIN CIRCUIT
BOARD with a CHANNEL-2 SCOPE PROBE (1V/div).
e. Adjust the VR CONTROL on the ADJ. FIXTURE until
the ENVELOPE signal is maximum while play back the
ALIGNMENET TAPE.
f. Adjust the S/T GUIDE ROLLER until the envelope signal
waveforms of the entrance and exit sides are as shown in
Fig. 5-7.
ADJUSTMENT OF THE TAPE TRANSPORT SECTION. (CONTINUED)
FIg.5.5 Adjustment of the X-POSITION
S/W PULSE TEST PINPATH ADJ. FIXTURE
ENVELOPE TEST PINPATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROLPATH ADJ.FIXTURE
S/T GUIDE ROLLERTAPE TRANSPORT SECTION
Test Point
Adjustment
a: Max Output of Envelope
b: Min Output of Envelope
FIg.5.7 Adjustment of Linearity
Fig.5.6 Playback Phase Adjustment
S/W PULSE TEST PINMAIN CIRCUT BOARD
ENVELOPE TEST PINMAIN CIRCUT BOARD
Measurement Equipment OSILLOSCOPE
VR 595(PG SHIFTER)MAIN CIRCUT BOARD
Test Point
Adjustment
H. Adjustment of the wave form of DRUM Entrance
/ Exit (Fig. 5.8)
a. Connect the PT01 on the MAIN CIRCUIT BOARD with
a PATH ADJ.FIXTURE.
b. Play back an ALIGNMENT TAPE(DN-2 : MONO-
SCOPE signal)
c. Connect the S/W PULSE TEST PIN on the PATH ADJ.
FIXTURE with a CHANNEL-1 SCOPE PROBE.
d. Connect the VIDEO OUT on the MAIN CIRCUIT
BOARD with a CHANNEL-2 SCOPE PROBE(1V/div).
e. Turn the VR CONTROL on the PATH ADJ.FIXTURE
clockwise or counterclockwise until the signal shape of
ENVELOPE has the constant thickness.(Fig.5.8)
f. Adjust the S/T GUIDE ROLLER if the thickness of the
ENVELOPE signal is not uniform.
I. REVIEW PLAY(Fig. 5.9)
a. Connect the PT01 on the MAIN CIRCUIT BOARD with
a PATH ADJ.FIXTURE.
b. Play back an ALIGNMENT TAPE(DN-2 : MONO-
SCOPE signal)
c. Connect the S/W PULSE TEST PIN on the PATH ADJ.
FIXTURE with a CHANNEL-1 SCOPE PROBE.
d. Connect the VIDEO OUT on the MAIN CIRCUIT-
BOARD with a CHANNEL-2 SCOPE PROBE (1V/div).
e. Make the VR CONTROL on the PATH ADJ. FIXTURE
to the center to maximize the ENVELOPE signal.
f. Play back the REVIEW mode about 15 second and alter
the mode to PLAY MODE.
g. Check whether the ENVELOPE waveform restore to its
original form within 3 second when the REVIEW mode is
changed to PLAY mode.
h. If the requirement of “g” is not satisfied, Check the run-
ning status of tape on the lower part of T GUIDE POST
and adjust the S/T GUIDE ROLLER precisely
.
J.Checking AUDIO output waveform (Adjustment
of AC HEAD TILT & Height)
a. Connect the AUDIO output jack with an AUDIO LEVEL
METER.
b. Playback an Alignment Tape (DN-1:Color Bar 1KHz
Signal)
c. Check if the AUDIO output signal level is over -9~-
3dBm.
d. If the requirement of “c” is not satisfied, readjust the AC
HEAD TILT and the HEIGHT until the AUDIO output is
maximized. (Fig. 5.2, 5.3)
ADJUSTMENT OF THE TAPE TRANSPORT SECTION. (CONTINUED)
S/W PULSE TEST PINPATH ADJ. FIXTURE
ENVELOPE TEST PINPATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROLPATH ADJ.FIXTURE
S/T GUIDE ROLLERTAPE TRANSPORT SECTION
Test Point
Adjustment
FIg.5.8 Fine adjustment of the ENVELOPE at the DRUM
ENTRANCE/EXIT
S/W PULSE TEST PINPATH ADJ. FIXTURE
ENVELOPE TEST PINPATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROLPATH ADJ.FIXTURE
S/T GUIDE ROLLERTAPE TRANSPORT SECTION
Test Point
Adjustment
FIg.5.9 Waveform change when the modealtered
(REVIEW ↔PLAY)
AUDIO OUTPUTAUDIO OUTPUT JACK
AUDIO LEVEL METER
Test Point
Measurement Equipment
K.Adjustment of the AUDIO AZIMUTH
a. Connect the AUDIO output JACK with an AUDIO
LEVEL METER.
b. Play back the ALIGNMENT TAPE(DN-2:MONO-
SCOPE 7KHz Signal).
c. Check if the AUDIO output signal level is over : -9 ~-
3dBm.
d. If the requirement of “c” is not satisfied, readjust the
AZIMUTH SCREW of the AC HEAD until the AUDIO
output is maximum.(Fig. 5.4)
e. Repeat the process of “Adjustment of the wave form of
DRUM Entrance/Exit”
L.X-POSITION
a. Connect the PT01 on the MAIN CIRCUIT BOARD with
a PATH ADJ. FIXTURE.
b. Play back an ALIGNMENT TAPE(DN-2 : MONO-
SCOPE Signal).
c. Connect the S/W PULSE TEST PIN on the PATH ADJ.
FIXTURE with a CHANNEL-1 SCOPE PROBE.
d. Connect the VIDEO OUT on the MAIN CIRCUIT
BOARD with a CHANNEL-2 SCOPE PROBE (1V/div).
e. Check if the ENVELOPE is maximum when the VR
CONTROL on the PATH ADJ. FIXTURE is in CENTER
f. If the requirement “e” is not satisfied, readjust the X-POSI-
TION by referring to subitem “E”(Adjustment of the XPOSITION).
g. Repeat the process of subitem “F”(PLAYBACK PHASE
ADJUSTMENT).
ADJUSTMENT OF THE TAPE TRANSPORT SECTION. (CONTINUED)
AUDIO OUTPUTAUDIO OUTPUT JACK
AUDIO LEVEL METER
Test Point
Measurement Equipment
S/W PULSE TEST PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROLPATH ADJ.FIXTURE
S/T GUIDE ROLLER
TAPE TRANSMISSION T SECTION
Test Point
Adjustment
ELECTRICAL ADJUSTMENT
Fig. 1 Main board test point/control location guide(component)
RTD300
ELECTRICAL ADJUSTMENT
PG (Pulse Generator) Shifter Adjustment (Fig. 3)
Test Points: PT01 PIN #Main
Video Out JackRear Panel
Adjust:REC SWITCHMain
The Pulse Generator (PG) Shifter determines the video head
switching point during playback. Misadjustment of the PG
Shifter may cause head switching noise in the picture and/or vertical jitter.
1. Load the instrument with an alignment tape and play back
the color bar signal or monoscope signal.
2. Connect Path Fixture to PT01.
3. Connect channel-1 scope probe (1V/div.: 50µ sec/div.) to
PT01 PIN #. Trigger the scope on channel-1.
4. Connect channel-2 scope probe (1V/div.) to the Video Out
Jack.
5. Set the scope to (-) slope and press the REC SW, the alignment is performed automatically. Confirm that the trailing
edge of the SW 30Hz pulse is placed 6.5H±0.5H (horizontal)
lines before the start of vertical sync pulse.
SWITCHING
SW30Hz
PULSE
VIDEO
OUTPUT
V. SYNC
6.5H–0.5
Fig. 3 - Automatic PG Shifter Adjustment
Fig. 1 - Legs Removal
Fig. 2 Top Cover Removal
INSTRUMENT DISASSEMBLY
Perform all disassembly procedures in the order presented. When reassembling, use the reverse procedure. Make sure that all
leads/wiring are routed correctly when reassembling.
PRT_CSYS_DEFyyDEFAULT
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Fig. 3 . Panel Front Removal
INSTRUMENT DISASSEMBLY (Continued)
Fig. 5 . DECK & LOADER,POWER BOARD Removal
Fig. 4 . LOGIC PCB Removal
INSTRUMENT DISASSEMBLY (Continued)
Fig. 6. Main Board Removal
Fig. 7. Chassis Main Removal
INSTRUMENT DISASSEMBLY (Continued)
ABBREVIATIONS
AA or AUD: Audio
A.E.: Audio Erase
AC: Alternating current
ACC: Automatic Color Control
ACS: Auto Clock Set
AFC: Automatic Frequency Control
AFT: Automatic Fine Tuning
AGC: Automatic Gain Control
ALC: Automatic Level Control
AM: Amplitude Modulation
AMP: Amplifier
ANT: Antenna
APC: Automatic phase control
ASS'Y or AS: Assembly
AUTO: Automatic
AV or A/V: Audio/Video
BB: Base, Burst
BAL: Balance
BGP: Burst Gate Pulse
BPF: Bandpass Filter
BW or B/W: Black and White
CC: Capacitor, Chroma, Collector
C Rotary: Color Rotary
C-Sync: Composite Synchronization
CA: Commercial Advance
CAP: Capstan
CAR: Carrier
CATV: Cable Television
CBC: Cable Box Control
CCD: Charge Coupled Devices
CFG: Capstan Frequency Generator
CH: Channel
CHAR: Character
CHROMA: Chrominance
CLK: Clock
CNR: Color Noise Reduction
COMB: Comb Filter
COMP: Comparator, Composite, Compensation
CONV: Converter
CST: Cassette
CTL: Control
CUR: Current
CV: Composite Video
DD: Drum, Digital, Diode, Drain
DC: Direct Current
DD: DC-DC Convert
DEEM or DEEMPH
PIC: Picture
PIF: Picture Intermediate Frequency
PLL: Phase Locked Loop
PS: Phase Shift
PWM: Pulse Width Modulator
PWR: Power
QQ: Transistor
QV: Quasi Vertical
RR: Resistor, Right
REC: Recording
REF: Reference
REG: Regulated, Regulator
REMOCON: Remote Control (Unit)
REV: Reverse
REW: Rewind
RF: Radio Frequency
ROT: Rotary
SSEP: Separation
SHARP: Sharpness
SI or S IN: Serial Input
SO or S OUT: Serial Output
SP: Standard Play
STB: Strobe
SVC: Service
SW or S/W: Switch or Switching Pulse
SYNC: Synchronization
SYSCON: System Control
V-SYNC: Vertical Synchronization
VCA: Voltage Controlled Adjustor
VCO: Voltage Controlled Oscillator
VCR: Video Cassette Recorder
VD: Vertical Drive
VERT: Vertical
VGC: Voltage Gain Control
VHF: Very High Frequency
VR: Variable Resistor or Volume
W W: Watt
W/D: White and Dark
WF: Wave Form
WHT: White
XX-TAL: Crystal
YY FM: Luminance FM Signal
Y Y/C: Luminance/Chrominance
SPECIFICATIONS
Cleaning and Lubrication
A. Cleaning the Tape Transport System
The following parts should be cleaned after every 500 hours
of use.
• TENSION POLE
• S-GUIDE POST
• FE HEAD
• S GUIDE ROLLER
• S-SLANT POLE
• VIDEO HEAD/DRUM
• T-SLANT POLE
• T-GUIDE ROLLER
• AC HEAD/AE HEAD
• T-GUIDE POST
• CAPSTAN SHAFT
• PINCH ROLLER
Note: After cleaning with alcohol, allow the parts to dry thor-
oughly before using a cassette tape.
B. Cleaning the Drive System
The following parts should be cleaned after every 500 hours
of use.
• REEL TABLE
• T MAIN BRAKE
• S MAIN BRAKE
• T MAIN BRAKE
• CAPSTAN FLYWHEEL/PULLEY
• REEL PULLEY
C. Lubrication points
The following parts should be cleaned and lubricated after
every 500 hours of use. Apply one (1) or two (2) drops of oil.
Refer to the "Replacement Parts List" for the stock number of
the recommended oil.
• S REEL TABLE POST
• T REEL TABLE POST
• IDLER PULLEY
Power Input:120 Volts AC 60Hzaudio Input:-8.8dBm
Power Consumption:95Watts Audio output (common
Operating Temperature :5 degree C to 35 degree Cuse of DVD and VCR): Audio output terminal (2 kinds):
(41 degree F to 95 degree F)-8.8dBm(VCR), 2.0Vrms(DVD)
Storage Temperature: -30 degree C to 65 degree CAudio output (DVD only) : Analogue Audio output(2CH):2.0Vrms
(-22 degree F to 149 degree F)
Installation condition:Horizontal / Relative humidity Audio Input Impedance: More than 47k ohm
under 80%Audio Output Impedance : Less than 1.5k ohm
Weight: 6.45 kg (NET) VHF output: 3 or 4 CH
Playable tape: Very high dense tapes with VHS marks
Dimensions: 430mm Wide X 91mm HighPlayable disc: DVD,VIDEO-CD,CD(12mm)
X 355.5mm DeepCD(8mm),MP3,CD-R,CD-RW
Tape Speed: SP: 33.35mm/sec.
Recording SystemSLP: 11.12mm/sec.
4-head Hi Fi: Four video record/playbackMaximum Recording Time: T-60: 3 hours/SLP mode
headsT120: 6 hours/SLP mode
Rotary helical scan/luma: FMFast Forward/Rewind Time: <130sec (T-120 tape)
recording/chroma: convertedTuning System: Auto Program/Cable
subcarrier phase shifted recordingCompatible/Frequency
Two audio record/playbackSynthesis (FS)
headsClock display: 12 hrs AM/PM
Rotary helical scan, 2 channelsTime Recording: 8 programs a year
FM recordingPersistence in power
Received channels:VHF: 2-13 CH / UHF: 14-69 CHfailure: 1 min
/ Cable: 1-125Video S/N (VCR): Over 45dB(Standard recording)
Video Signal: EIA standard; NTSC colorResolution (VCR): Over 220 lines (Standard recording)
Antenna: 75 ohm input impedanceResolution (DVD): Over 500 lines (DVD Disc PLAY)
Video Signal Level: 1Vp-p (140 IRE standard)Audio (VCR): Over 68dB(Hi-Fi),over 40dB(Mono)
Video output (common use of DVD and VCR):Audio (DVD): 100dB
VIDEO output terminal,Audio dynamic range: 70dB
1Vp-p (140 IRE standard)
Video output (DVD only):S-VIDEO output
(75 ohm In load Y: 1Vp-p, C:0.286Vp-p)
COMPONENT Progressive output
(75 ohm In load Y:1Vp-p, Pb:0.7Vp-p Pr:0.7Vp-p)
Note: Specifications are subject to change without notice.
CLEANING AND LUBRICATION
FIXTURE ITEMDESCRIPTION
Path Adj FixtureUse for X-position adjust/Tape path alignment
Special DriverUse for X-position adjust/Tape path alignment
THE SERVICE FIXTURE
Path Adj FixtureSpecial Driver
AC Millivolt Meter
Sensitivity: 1.0mVAC–400VAC
Dual-Trace Triggered Oscilloscope–with Lo
–Cap (X10)
and Direct Probes.
Response: DC–20MHz
Sensitivity: 5mV/div.
Max. Sweep Rate: 0.1µsec./div.
Frequency Counter–7 digits
Sensitivity: 25mV-5V
Range: 50Hz–100MHz
DVM
Range: 0.1VDC–1000VD
Accuracy: 0.5%
NTSC Video Signal Generator–Must provide 1V p-p negative
sync video across a 75 ohm load and produce standard NTSC
75% saturated color bars with a 100% white window.
DC Power Supply
Range: 0-50V, 2A well filtered.
Temperature Controlled Soldering Station–Grounded tip
(Tip temperature: 500°F-600°F).
Note: 500 °F Maximum for leadless components.
AC Variac–Continuously variable.
TEST EQUIPMENT REQUIREMENTS
1. Preparation for replacement
a. Soldering Iron
Use a pencil-type soldering iron that uses less than 30
watts.
b. Solder
Eutectic solder (Tin 63%, Lead 37%) is recommended.
c. Soldering time
Do not apply heat more than 4 seconds.
d. Preheating
Leadless capacitor must be preheated before installation.
(130°C~150°C, for about two minutes).
2. Removing the leadless component (Resistors, Capacitors)
Grasp the leadless component body with tweezers and alternately apply heat to both electrodes. When the solder on both
electrodes is melted, remove leadless component with a twisting motion.
LEADLESS (CHIP) COMPONENT REMOVAL INSTRUCTION
Note:
a. Leadless component must not be reused after removal.
b. Excessive mechanical stress and rubbing of the compo-
nent electrode must be avoided.
Note:
a. Do not attempt to lift the component off the board until
the component is completely disconnected from the
board by a twisting action.
b. Take care not to break the copper foil on printed board.
• The following procedures are recommended for the replacement of the leadless components used in this unit.
Chip
Tweezers
Soldering lron
PA TH FIXTURE CONNECTION/TEST POINT IDENTIFICATION
Refer to the adjustment of the tape transporting system.
Connect to PT01
!pin-^pin of the
MAIN CIRCUIT BOARD.
CTL pulse test point
GND
S/W pulse test point
ENVE pulse test point
!
^
3. Installing the Leadless (chip) Component
a. Presolder the contact points of the circuit board.
b. Press the part downward with tweezers and solder both
electrodes as shown below.
4.Removing of Flat ICs (Recommended procedure)
a. For removing solder chips from IC's pins, use a solder
remover or a wiry solder absorber.
b. Heat the IC's tips evenly by moving the chip IC replacing
tool around them, and detach the IC's leads with a tool in
the way of using a lever.
c. Do not reuse ICs removed once (Discard them)
Note:
Do not glue the replacement leadless component to the
circuit board.
Soldering lron
Presolder
Tweezers
Soldering lron
Chip IC replacing tool
Solder
LEADLESS (CHIP) COMPONENT IDENTIFICATION
1. Check the followings before S.M.D Troubleshooting
• Cracked or Chipped Component Body
• Cracked or Separated Solder Joints
• Peeling end Terminations or Fractured Leads
2. S. M. D (Surface Mounted Devices) Identification
a. Chip Resistor Identification
* Standard Chip Resistor Code
b. Chip Capacitor Identification
There is no identification of chip capacitor
REMARK Leadless (CHIP) Components are identified on
schematic by means of "(C)" adjacent to symbol
numbers.
• Rejection of Solder from Copper Pads or Component
• Foreign Matter on Copper Pads
• Solder Bridges
= 12x10
3
(1000) = 12000Ω
= 12KΩ
= 47x10° (1) = 47Ω
XXX
123
470
MULTIPLIER (0-9)
2nd SIG. DIGIT (0-9)
1st SIG. DIGIT (1-9)
Examples
1.1 Characteristic of T6-DECK MECHANISM
1) T6-MECHA follows the VHS and the NTSC standard.
3) T6-MECHA uses L/C Motor to drive FRONT LOADING.
4) T6-MECHA uses 4-BIT MODE signal to recognize each MODE.
This 4-BIT MODE signal is generated from the cam switch driven by the L/C MOTOR.
5) T6-MECHA has 7MODES (EJECT/INITIAL/REV/IDLE/PLAY,STOP,SLOW/BRAKE/FF&REW) operation.
6) T6-MECHA deduce the MODE changing time by adopting the full loading system which maintains the
tape winding the drum circumference.
7) T6-MECHA can be separated from the main pcb, and be assembled with B-B type connector . This B-B type
connectioning means that CAPSTAN MOTOR, LC MOTOR, AC HEAD, FE HEAD, DRUM are connected
directly without using connector cable.
SW712229720SWITCHFRONT PANEL ASSEMBLYRTD3005S50101Z90
SW713229720SWITCHFRONT PANEL ASSEMBLYRTD3005S50101Z90
SW714229720SWITCHFRONT PANEL ASSEMBLYRTD3005S50101Z90
U001N/S/PPCB MAIN 330X246X1.6TMAIN BOARD ASSYRTD30097P65336MA
U001N/S/PPCB AMP 280X220X1.6T/2POWER AMP ASSEMBLYRTD30097P65336AA
UL01N/S/PPCB UNION 330X246X1.6T/3FRONT PANEL ASSEMBLYRTD30097P65336UA
X220265597CRYSTAL, 12MHZPOWER AMP ASSEMBLYRTD3005XE12R000E
X301238832CRYSTALMAIN BOARD ASSYRTD3005XE3R579TB
Z001N/S/PPCB MAIN AS DR-C9A21N-BSVCR ASSEMBLYRTD300PVMPMSN669
Z0011N/S/PMAIN CHIP MOUNT A DR-C9A21N-BSMAIN BOARD ASSYRTD300PVMPJ1N669
Z0012N/S/PMAIN RADIAL AUTO AS DR-C9A21N-BSMAIN BOARD ASSYRTD300PVMPJRN669
Z0013N/S/PMAIN AXIAL AUTO AS DR-C9A21N-BSMAIN BOARD ASSYRTD300PVMPJAN669
Z0014N/S/PPCB MAIN JUMP ONLY AS DR-C9A21N-BSMAIN BOARD ASSYRTD300PVMPJVN669
Z003N/S/PPCB LOGIC MANUAL AS DR-C9A21N-BSFRONT PANEL ASSEMBLYRTD300PVLAMSN669
Z0031N/S/PPCB LOGIC CHIP AS DR-C9A21N-BSFRONT PANEL ASSEMBLYRTD300PVLAJ1N669
Z0032N/S/PPCB LOGIC RADIAL AS DR-C9A21N-BSFRONT PANEL ASSEMBLYRTD300PVLAJRN669
Z0033N/S/PPCB LOGIC AXIAL AS DR-C9A21N-BSFRONT PANEL ASSEMBLYRTD300PVLAJAN669
Z010N/S/PPCB AMP MANUAL AS DR-C9A21N-BSPOWER AMP ASSEMBLYRTD300PVAMMSN669
Z0101N/S/PPCB AMP CHIP AS DR-C9A21N-BS(DWE0908A)POWER AMP ASSEMBLYRTD300PVAMJ1N669
Z0102N/S/PPCB AMP RADIAL AS DR-C9A21N-BSPOWER AMP ASSEMBLYRTD300PVAMJRN669
Page 19 of 19
2.2 PERIODIC MAINTENANCE AND SERVICE SCHEDULE
2.2.1) Periodic maintenance and Service
Schedule
A. In order to effectively maintain the excellent performance
and fully utilize the features of this apperatus and to
lengthen the life of mechanism and tapes, we strongly
urge you to perform the periodic maintenance and
inspection as described below.
• Following should be done after the substition of parts of
deck or correction of deck failure.
B. Cleaning of the DRUM TOTAL ASS`Y
- Slowly turnning DRUM TOTAL ASS`Y, wipe the drum
surface with clean cloth soaked in alchol. (Don’t connect
the power when turnning the UPPER DRUM)
- Don’t wipe the Head-Tip vertically with cleaning cloths.
C. Tape transporting section cleaning
- Clean the tape transporting section with clean cloth
soaked in alchol.
D. Driving section cleaning
- Clean the driving section with clean cloth soaked in
alchol.
E. Everyday inspection
- Perform the maintenance and inspection periodically
according to the number of use.
- Refer to the table 2.2.3.
2.2.2) Cleaning and Lubrication
2.2.2) Cleaning and Lubrication
A. Cleaning of Tape Transporting section and driving section
a. Cleaning of Tape Transporting section
- The following parts shoule be cleaned after every 500
hours of use.
• TENSION POLE • S SLANT POLE
• AC HEAD/AE HEAD• GUIDE POST
• VIDEOHEAD / DRUM• T GUIDE POST
• FE HEAD• T SLANT POLE
• CAPSTASN SHAFT• S GUIDE ROLLER
• T GUIDE ROLLER• PINCH ROLLER
- Because the above part contact with video tape, they
tend to be stained with dusts and foreign substances
which make the bad effect on the picture and sometimes lead to the tape damage.
- Be sure to check the remained alchol during cleaning
evaporated thoroughly before using a tape.
b. Cleaning of the driving section
• REEL TABLE
• CAPSTAN FLYWHEEL/PULLEY
• REEL PULLEY
B. Lubrication
• REEL GEAR POST : After the cleaning the parts with
alchol, lubricate them with one or twol drops of ool
• S/T REEL TABLE POST : After the cleaning the parts
with alchol, lubricate them with grease.
2.2.3) Service Sechedule for each parts
Following parts should be checked according to the recommanded intervals
: Check and replace if necessary.: Replace
Period Service (Hours)
PART Name10002000300040005000
DRUM TOTAL ASS’Y
CAPSTAN MOTOR
L/C BRKT TOTAL ASS’Y
REEL BELT
IDLER PLATE TOTAL ASS’Y
REEL TABLE
T BRAKE ASS’Y
TENSION BAND ASS’Y
PINCH ROLLER ASS’Y
AC HEAD ASS’Y
FE HEAD
REEL BRKT TOTAL ASS’Y
NOTE:
Independant of the above service shedule, Cleaning and lubrication and replacement of the belt sould be undertaken
every 2 years.
2.3 JIGS AND TOOLS
2.1 List of Jigs and Tools
FIG.
NOITEMSMODEL
N O
REMARKS
NTSC: SP MONOSCOPE 7KHzCHECKING OF THE
1ALIGNMENT TAPESP COLOR BAR 1KHz!T APE TRANSPORTING
(EP MONOSCOPE)SECTION
2
CLEANING T APE
DHC-602V@
CHECKING OF THE T APE
(DAEWOO)TRANSPORTING SECTION
3
CASSETTE T APE TORQUEKT-300NV
#
MEASUREMENT OF THE
METER(KOKUSAI)KT-300RVREEL TORQUE
4
VHS SPINDLE
TSH-V4$
MEASUREMENT OF
HEIGHT GAUGEREEL T ABLE HEIGHT
5
TENTELO METER
T2-H7-UM%
MEASUREMENT OF
(TENTELO)THE BACK TENSION
FAN TYPEMEASUREMENT OF THE
6TENSION METER
<
3KG^PRESSING FORCE FOR
THE PINCH ROLLER
7DENTAL MIRROR&
CHECKING OF THE T APE
TRANSPORTING SECTION
8
+
DRIVER*-1ASSEMBLY,
DISASSEMBLY
ADJUSTMENT DR IVER*-2AND ADJUSTMENT
2.3.2 A SKECTCH OF JIGS AND TOOLS
!
#
%
&
@
$
^
*
ALIGNMENT TAPE
CLEANING TAPE
30
20
VHS SPINDLE
10
30
0
20
10
HEIGHT GAUGE
30
20
10
30
0
10
20
TROUBLESHOOTING GUIDES
POWER CIRCUIT
Check IC601, IC701.
No power
POWER cord is ok?
Is 120~200V voltage
obtained at C801+?
Output voltage of 2
nd
parts is abnormal?
Check
rectifier diode of 2
nd
parts ;
D901,D903,D904,D905,D906,
D907,D908,D909,R921.
Switching
pulse of Q801 drain, Q701
drain is normal?
OK
Exchange POWER CORD
Check D801, TH801,
F801,LX801, LX802.
Exchange rectifier diode of
2
nd
parts ;
D901,D903,D904,D905,D906,
D907,D908,D909,R921.
Check IC801, Q801, IC701, Q701.
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
◆ Caution: When checking the primary circuit, be sure to use an isolation transformer.
SYSTEM CIRCUIT
No VFD display.
Is 5V obtained at IC701 pin#13?
Is -24V obtained at IC701
pin#30?
Oscillation at IC701 pin #8?
Is -24V, +20V obtained
at F-, F+?
Specific GRID/SEG doesn’t
function.
Check D721.
Check POWER circuit at -24V.
Check IC701.
Check IC 701 pin #31~42.
Check IC 701 pin #14~29.
NO
YES
YES
YES
YES
NO
NO
NO
NO
GRID output at PORT of
IC701?
YES
SEG output at PORT of IC701?
Check POWER circuit at F-, F+.
Exchange IC601.
YES
A. VFD DISPLAY
NO
TROUBLESHOOTING GUIDES (Continued)
TROUBLESHOOTING GUIDES (Continued)
No power compensation.
Voltage of power fail (IC601
pin#100) at micom is 0.7V over?
More than 3.2V is maintained
for 1 minutes at IC601 pin#37
during Power Cord Open.
Check R625.
NO
YES
B. No power compensation.
YES
Check RESET circuit.
NO
Exchange IC601.
Noise appears on the
playback screen.
Is noise diminished by tracking
adjustment.
Noise band is trembled up and
down?
Re-adjust PATH.
Is the height of CTL HEAD normal?
No dust?
Is there problem in CTL Input
circuit and amplifier.
YES
NO
NO
NO
Is there CTL pulse at IC601
pin#97?
Check IC601.
Noise appears on the screen
even though changing tape.
Re-adjust the height of AC
HEAD. Remove the dust.
Check C651, C652, R651~R653
IC601 pin #91, 92, 98.
NO
Re-adjust PATH.
C-1. Bad playback quality (1)
YES
YES
YES
YES
TROUBLESHOOTING GUIDES (Continued)
Noise appears on the Full
playback screen.
Are SW pulse and HA SW
normal?
Recheck step C-1 (Bad
playback quallty (1)).
Check HEAD AMP connector
and HEAD.
YES
YES
NO
NO
ENVE Wave at PT01 pin #4?
Check VIDEO circuit.
Are there SW, HA SW pulse at
IC601 pin #16, 18?
Check PCB Pattern.
Check IC601.
C-2. Bad playback quality (2)
No broadcasting signal
received
Is the output at IC601 pin#
71(CLK), 72 (DATA) normal?
Is SIF,Video output at
TMI(RF101) pin#18,20 normal?
Check IC 601.
Check IC301.
Check IC601.
YES
YES
NO
NO
NO
Is Video Signal input at IC601
pin#50?
Is there Video output at IC601
pin#52?
Check TMI (RF101) Block.
NO
Check Video Buffer Q101
D. No broadcasting signal received
YES
YES
NO
YES
YES
YES
TROUBLESHOOTING GUIDES (Continued)
Cassette tape isn’t
inserted.
Is 5V voltage obtained at
Loading parts IC601 pin#82?
Is 13V voltage obtained at
Capstan Motor pin#8?
Check at Power Circuit 14V.
Check (D905, D906).
Connect Capstan and Loading Motor.
Check connector and Capstan Motor.
YES
NO
NO
NO
Is 12V voltage obtained at Each
parts of Loading Motor?
Replace Loading Motor.
Check D851 (Main circuit).
E. No CASSETTE Loading
YES
YES
F. AUTO STOP in Playback mode
VCR stops automatically
in playback mode.
Check R656,C659 and P603 pin#11
Check P502 connector.
Check S603, S604 REEL Sensor.
Is D.PG/FG pulse at IC601
pin#90 normal ?
Is C. FG pulse at IC601
pin#87 normal ?
Is there REEL Pulse at IC601
pin#79, 80?
Check and replace IC601.
NO
YES
YES
YES
NO
Check C.FG(R665, C660)
and P603 pin#1.
NO
TROUBLESHOOTING GUIDES (Continued)
G. DRUM Motor stops
H. CAPSTAN doesn’t rotate
CAPSTAN doesn’t rotate.
Is 14V voltage obtained
at P603 pin#2?
YES
NO
NO
NO
YES
YES
Is Capstan PWM fit to
IC 601 pin#77?
Is 3.2V voltage obtained
at P603 pin#5?
Is 2~3V voltage obtained
at P603 pin#9?
Check P603 Connector and
Capstan Motor.
Check 14V.
(D905, C906)
Check Capstan FG
(IC 601 87).
Check R665, R664, R663,
R666, C665.
Check R661, R667, C664.
DRUM Motor stops.
Is 13V voltage obtained at
P603 pin#8?
YES
NO
NO
NO
YES
YES
Is DRUM PWM fit to IC 601
pin#76?
Is 1.2V voltage obtained at
P603 pin#12?
Check Capstan Motor and
DRUM Motor.
Check 14V
(P601 #9).
Check DRUM PG/FG(IC 601 90).
Check R657, R658,C661,C668.
NO
A. EE screen doesn’t appear
EE screen doesn’t appear.
Is video signal input at
IC301 pin#28, 30, 32?
Is 5V obtained at IC301
pin#23, 44, 45, 52, 68?
Is C.S, DATA, CLOCK signal
input IC301 pin#53,54,55?
Is video signal output at
IC601 pin#52?
Check IC401, LINE JACK and
IF circuit.
Check power circiut.
Check IC pin#61, 71, 72.
NO
YES
YES
YES
NO
NO
NO
Is 5V obtained at IC601
pin#53, 98, 99?
YES
Is signal input at IC401
pin#2?
YES
NO
Check PCB pattern.
Is video signal output at
IC301 pin#26?
YES
NO
Check IC301 pin#24 QV-sync.
Is signal input at IC601
pin#50?
YES
NO
Is 12V obtained at IC401
pin#16?
Is C-sync signal input at
IC601 pin#58?
YES
NO
Check IC301 pin#25 and
PCB pattern.
YES
Check RF Output.
Check Line JACK output.
Check IC 601
YES
VIDEO CIRCUIT
TROUBLESHOOTING GUIDES (Continued)
NO
Check power circuit.
Check PCB pattern and replace
IC401
YES
NO
Check power circuit.
TROUBLESHOOTING GUIDES (Continued)
B. Playback picture doesn’t appear
YES
YES
Is Y signal output at IC301
pin#35?
Is Y signal input at IC301
pin#39?
Check and Replace IC301.
Playback picture doesn’t
appear.
Is C.S, DATA, CLOCK signal
input IC301 pin#53,54,55?
NO
NO
YES
Check EE mode
and OSD circuit
Check IC pin#61, 71, 72.
Is 5V obtained at IC301 pin#91?
Is 5V obtained at IC301
pin#23,44,45,68?
Check power circuit.
Clean or Replace HEAD.
Check power circuit.
YES
NO
Does X301(3.58MHz) oscillate?
Check Pattern.
NO
NO
YES
NO
YES
YES
YES
Replace X301.
Is Video signal output at IC301
pin#26?
Replace IC301.
NO
YES
Is SW Pulse input at IC301
pin#57?
Is envelope output at IC301
pin#14?
YES
YES
Check IC601 pin#18.
NO
Replace IC301.
NO
TROUBLESHOOTING GUIDES (Continued)
Is 5V obtained at IC301
pin#68?
NO
NO
YES
YES
Is VIDEO SW Pulse input at
IC301 pin#57?
Is REC signal input at IC301
pin#66,73?
EP MODE: Pin #73
SP MODE: Pin #66
Check video HEAD and
Connector.
Is signal input at IC301 pin#
28, 30,32?
Check POWER circuit.
Check IC601 pin#18.
No recording.
Check EE MODE.
YES
Is FM signal output at IC301
pin#14?
Replace IC301.
NO
NO
YES
C. No recording
TROUBLESHOOTING GUIDES (Continued)
NO
Is power_on_H signal output at
PJ601 pin#11.
Change video mode.
No Logo display. Do not open
tray
Is video mode-S-Video
mode?
Is power supplied CN2?
(In DVD loader PCB)
NO
D. No OSD(On Screen Display) appears
YES
YES
Check IC 601 pin#29 and PCB
pattern.
Is video signal input IC401
pin#1?
Is video signal output at P101
pin#1,3,5,7,8,9?
NO
NO
Check POWER circuit.
YES
NO
Check DVD loader.
Check DVD video buffer (Q103,
Q104,Q105,Q106,Q107)and DVD
output jack(JK103, JK104)
Check PCB pattern.
Check IC401 and EE mode.
YES
YES
YES
1. RCA
A. No sound in E-E mode
TROUBLESHOOTING GUIDES (Continued)
AUDIO CIRCUIT
No sound in RF E-E
mode
Check Output JACK.
A-1. TV E-E
NO
Check IC601.
Is Audio signal output at IC251
pin#53, 57?
Are CLK and DATA obtained
at IC251 pin#42,43?
NO
Is 5V obtained at IC251
pin#40?
Is there SIF signal at IC251
pin#48 in RF mode?
Check RF101.
NO
Replace IC251.
YES
YES
YES
Is 12V obtained at IC251
pin#58?
NO
YES
Check POWER circuit.
YES
YES
Is there MUTE(H) at IC251
pin#36?
YES
TROUBLESHOOTING GUIDES (Continued)
IC 12V
obtained at
IC252 pin #16?
YES
Check Output JACK.
YES
NO
Check IC601.
No sound in LINE1 E-E
mode.
Is 12V obtained at IC251
pin#58?
NO
Is 5V obtained at IC251
pin#40?
Check POWER circuit.
YES
NO
Are CLK and DATA obtained at
IC251 pin#42,43?
Check Input LINE1
JACK
Replace IC251
YES
Is Audio signal output at IC251
pin#53, 57?
Is Audio signal at IC251
pin#10,15?
YES
Is there MUTE(H)
at IC251 pin#36?
NO
A-2. LINE1 E-E
Are there H, H
at IC252 #9,
#10?
Are there at
signal IC252
#3, #13?
NO
YES
NO
Replace IC 252
YES
YES
NO
NO
YES
YES
YES
TROUBLESHOOTING GUIDES (Continued)
IC 12V
obtained at
IC252 pin #16?
YES
Check Output JACK.
YES
NO
Check IC601.
No sound in LINE2 E-E
mode.
Is 12V obtained at IC251
pin#58?
NO
Is 5V obtained at IC251
pin#40?
Check POWER circuit.
YES
YES
NO
Are CLK and DATA obtained at
IC251 pin#42,43?
Check Input LINE2
JACK
Replace IC251
YES
Is Audio signal output at IC251
pin#53, 57?
Is Audio signal at IC251
pin#10, #15?
YES
Is there MUTE(H)
at IC251 pin#36?
NO
A-3. LINE2 E-E
Are there H, H
at IC252 #9,
#10?
Are there at
signal IC252
#3, #13?
NO
YES
NO
Replace IC 252
YES
YES
NO
YES
YES
NO
TROUBLESHOOTING GUIDES (Continued)
IC 12V
obtained at
IC252 pin #16?
YES
Check Output JACK.
YES
NO
Check IC601.
No sound in
LINE3(FRONT) E-E mode.
Is 12V obtained at IC251
pin#58?
NO
Is 5V obtained at IC251
pin#40?
Check POWER circuit.
YES
NO
Are CLK and DATA obtained at
IC251 pin#42,43?
Check Input LINE3
JACK
Replace IC251
YES
Is Audio signal output at IC251
pin#53, 57?
Is Audio signal at IC251
pin#10,#15?
YES
Is there MUTE(H)
at IC251 pin#36?
NO
A-4. LINE3 (FRONT) E-E
Are there H, H
at IC252 #9,
#10?
Are there at
signal IC252
#3,#13?
NO
YES
NO
Replace IC 252
YES
YES
NO
YES
YES
YES
NO
TROUBLESHOOTING GUIDES (Continued)
A-5. DVD E-E
Is there reset at ICD01 #14?
NO
NO
YES
YES
Is 12V obtained at ICD02 #8?
Are there signal at ICD02 #1, #7?
Is 12V obtained at IC251 #58?
Check DVD Board.
Check signal flow circuit.
NO sound DVD EE mode.
Are there voltage at ICD01
#8(5V), #9(3.3V), #21(5V)?
YES
Are there clocks at ICD01 #5(BCLK),
#6(LRCLK), #10(MCLK)?
Check ICD02
NO
YES
NO
Check POWER circuit.
YES
Is 5V obtained at IC251 #40?
YES
Is audio signal at IC251,
#1,#2,#3, #4?
YES
Check output JACK.
Is audio signal output at IC251,
#53, #57?
YES
NO
Check IC601.
Are CLK and DATA obtained at
IC251 pin#42,43?
Replace IC251
YES
YES
Is there MUTE(H)
at IC251 pin#36?
NO
YES
NO
YES
NO
TROUBLESHOOTING GUIDES (Continued)
A-6. SUBWOOFER PRE-OUT E-E
Are there clocks at ICD01 #5(BCLK),
#6(LRCLK), #10(MCLK)?
NO
NO
YES
YES
Is there reset(H) at ICD01
#14?
Is 12V obtained at ICD03 #8?
Are there signals at ICD03 #1?
Check Power circuit.
Check DVD Board.
NO sound Subwoofer pre-
out EE mode.
Is Speaker setup default or
configuration1?
YES
Are there voltages at ICD01 #8(5V),
#9(3.3V), #21(5V)?
Check signal flow circuit.
NO
YES
NO
Subwoofer output is only in the
default or configuration1.
YES
Check output JACK.
YES
Check ICD02.
NO
YES
TROUBLESHOOTING GUIDES (Continued)
Is there playback Audio signal
at IC251 pin#53, 57?
Are CLK and DATA obtained
at IC251 pin#42, 43?
NO
Is thereMUTE(H) at IC251
pin#36?
Check IC601.
YES
Is A.SW Signal input at IC251
pin #27?
Check DRUM connector and
DRUM.
NO
Check A.SW at IC601
pin#19.
NO
Replace IC251.
YES
NO
Is 12V obtained at IC251
pin#58?
Check Output JACK.
YES
YES
YES
B. No Hi-Fi playback audio (PLAY MODE)
Is there Hi-Fi(H) at IC251
pin#28?
Check POWER circuit.
NO
Is 5V obtained at IC251
pin#40?
NO
YES
YES
TROUBLESHOOTING GUIDES (Continued)
Are there Audio signal
at IC251 pin#9,14
#10, 15
#2,4?
Is there REC(H)
at IC251 pin#29, 30?
Check input LINE1 JACK.
Check input LINE2 JACK.
Check input LINE3(Front)
JACK.
Replace IC251
YES
NO
NO
NO
Is FM OSC signal at IC251
pin#21?
Is FM OSC signal at P301
pin#2?
Check IC601 pin#22
c. No Hi-Fi playback in record/playback mode(REC MODE)
YES
YES
Replace DRUM
NO
HEAD CLEANING.
YES
TROUBLESHOOTING GUIDES (Continued)
D. No NORMAL AUDIO playback (PLAY MODE)
Is Playback Audio signal at
IC301 pin#10?
Replace IC251.
YES
NO
NO
Is there Playback Normal Audio
signal at IC251 pin#53,57?
Check A/C HEAD and IC301
YES
Check Output JACK.
YES
Is there normal Audio signal
at IC251 pin#53, 57?
NO
Check power circuit.
NO
Voltage at IC251 pin#58 is
12V? Voltage at IC251 pin#40
and at IC301 pin#77 is 5V?
TROUBLESHOOTING GUIDES (Continued)
E. No NORMAL AUDIO playback in record/playback mode(Check in REC mode)
No Normal Audio playback in
record/playback mode
Are there Audio signal at
IC251 pin#9,14
#10,15
#2,4?
Is there recording signal at
IC251 pin#61?
Check Input LINE1 JACK.
Check Input LINE2 JACK.
Check input LINE3(Front)
JACK.
Check signal flow circuit.
YES
NO
NO
NO
Signal at IC251 pin#61 is
transferred to IC301 pin#76,78,80?
Collect signal at Q203 is
about 70Vp-p at 70KHz?
Check IC251.
YES
YES
Check Q202.
NO
Check P202 pin#2, 4, 8 and
A/C HEAD.
YES
REC (H) BASE voltage at
Q206 is 5V?
Check IC601 pin#22.
NO
YES
2. HEADPHONE
TROUBLESHOOTING GUIDES (Continued)
Is there reset(H) at ICD01 #14?
NO
NO
YES
YES
Is 12V obtained at ICD03 #8?
Are there signals at ICD04
#1, #7?
Check DVD Board.
Check signal flow circuit.
NO sound in DVD or
EXTERNAL mode.
Are there voltages at ICD01 #8(5V),
#9(3.3V), #21(5V)?
YES
Are there clocks at ICD01 #5(BCLK),
#6(LRCLK), #10(MCLK)?
NO
YES
NO
Check Power circuit.
YES
Check output JACK.
Check ICD02.
NO
YES
TROUBLESHOOTING GUIDES (Continued)
Is+3.3V obtained at IC200
VDD_3.3?
Is+2.5V obtained at IC200
VDD_2.5?
Is+3.3V obtained at the IBIAS
of IC301,IC330,IC360?
Check power circuit.
YES
NO
Is+32.5V obtained at the Vcc of
IC301,IC330,IC360?
YES
YES
Check IC220
NO
Is there ¡fiH¡flat IC200
#64(PWDN)?
Is There ‘H’ output of
IC222 #3?
NO
Is+3.3V obtained at PWRDN
of IC301IC330,IC360?
YES
No sound in the DVD MODE.
Is there ¡fiH¡flat IC220 #25?
Check Q201, Q202
Check IC301, IC330, IC360
and signal Flow circuit and
replace inferior device.