THOMSON RCA RTD300 Schematic
3.1 Removal of the FRONT LOADING Ass’y
(Fig. 3.1)
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
REVIEW PLAY 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 PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROL PATH ADJ.FIXTURE
AC HEAD ADJUST HOLE ADJUSTMENT 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 PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROL PATH ADJ.FIXTURE
S/T GUIDE ROLLER TAPE 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 PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROL PATH ADJ.FIXTURE
S/T GUIDE ROLLER TAPE TRANSPORT SECTION
Test Point
Adjustment
FIg.5.8 Fine adjustment of the ENVELOPE at the DRUM
ENTRANCE/EXIT
S/W PULSE TEST PIN PATH ADJ. FIXTURE
ENVELOPE TEST PIN PATH ADJ.FIXTURE
Measurement Equipment OSILLOSCOPE
VR CONTROL PATH ADJ.FIXTURE
S/T GUIDE ROLLER TAPE TRANSPORT SECTION
Test Point
Adjustment
FIg.5.9 Waveform change when the modealtered
(REVIEW ↔PLAY)
AUDIO OUTPUT AUDIO 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 OUTPUT AUDIO 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 CONTROL PATH 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 Jack Rear Panel
Adjust: REC SWITCH Main
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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xx
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
A A 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
B B : Base, Burst
BAL : Balance
BGP : Burst Gate Pulse
BPF : Bandpass Filter
BW or B/W : Black and White
C C : 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
D D : Drum, Digital, Diode, Drain
DC : Direct Current
DD : DC-DC Convert
DEEM or DEEMPH
: Deemphasis
DEMOD : Demodulator
DET : Dectector
DEV : Deviation
DFG : Drum Frequency Generator
DOC : Dropout Compensator
DS : Drain and Source
DSSC : Digital Satellite Set Control
dB : Decibel
E EDS : Extended Data System
ENVE : Envelope
E/V : Envelope/Vertical Sync
G GEN : Generator
GND : Ground
H H : High, Horizontal
HA or HEAD AMP
: Head Amplifier (PreAmp)
HD : Horizontal Drive, Head
HOR : Horizontal
HZ : Hertz
I I/O : Input/Output
IC : Intergrated Circuit
IF : Intermediate Frequency
INS : Insertion
IR : Infrar Red
K KIL : Killer
L L : Low, Left, Coil
LIM : Limit
LM : Loading Motor
LP : Long Play
LPF : Low Pass Filter
M MA : Movie Advance
MAX : Maximum
MIN : Minimum
MIX : Mixer, Mixing
MMV : Monostable Multivibrator
MOD : Modulation, Modulator
MPX : Multiplex
M/T or MTR : Motor
N NC : None Connection
NC or NOICAN : Noise Canceller
NL : None linear
NR : Noise Reduction
O OSC : Oscillator, Oscillation
OSD : On Screen Display
OSP : On Screen Program
OTR : One Touch Record
P P-P : Peak-to-Peak
PB : Playback
PC : Photo Coupler
PCB : Printed Circuit Board
PG : Phase Generator
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