JVC TD-X102 User manual

MODEL
TD-X102
A/B/C/E/G/U/V
This
model
TD-X102
is
a
version
of
the
model
KD-X1.
When
servicing
the
model
TD-X102,
refer
to
the
Service
Manual
for
the
mode!
KD-X1
(No.
4243)
Comparison Table
A\
parts
are
safety
assurance
parts.
VSEA
When
replacing
those
parts,
make
sure
to
use
the
specified
one.
, please.
]
+
.
Parts
No.
“|
A\|
Ref.
No.
+
Parts
Name
Remarks
O'ty
L
TD-X102
KD-X14
|
Enclosure
Assembly
Parts
List
[
10
|
VJC2171-009
VJC2171-001
Rear
Panel
A/B/C/E
version
~
1
i
ee
-010
vt
-002
a
U
version
1
ue
a
-011
a
-003
G/V
version
1
11
SDST3006M
SDST3006N
Screw
for
Rear
Pane!
2
12
SDSP3008M
SDSP3006N
=
U
version,
for
V.
Selector
2
VAN
14
QMP7380-200
QMP7600-200
Power
Cord
U
version
1
“AN
16
VTP52G2-021B VTP54N2-021B
Power
Transformer
U
version
1
22
SDSF3008M
SDSF3008N
Screw
for Pin
Jack
1
24
VJC1418-002
VJC1418-007
Front
Plate
1
|
26
VJC1417-013
VJC1417-011
Front
Panel
except
J
version
Zz
29
VXP3131-002
VXP3131-001
Power
Knob
1
33
E72968-001 E70913-001
Mark
1
45
VJD4895-008
VJD4895-001
Plate
1
51
VXP3129-013
VXP3129-008
Push
Button
for
Play
1
52
a
-014
ie
-009
ss
|
for
REW
1]
[
53
of
-015
-
-010
i
for
FF
1
54
i
-016
me
-011
"
for
Stop/Eject
1
55
i
-017
fd
-012
7
for
Pause
1
61
VJC2175-005
VJC2175-002
Top
Cover
1
64
VYN2200-003PA
|
VYN2176-003PA
|
Name
Plate
A
version
L714
ie ie
-002PA
"
-002PA
ue
B
version
1
as
4
-004PV
e
-004PV
ne
C
version
1
He of
-O05PA
ae
-OO5PA
uf
E
version
1
a
-
-007PA
=
-007PA
u
U
version
1
ss fe
-008PA
us
-O08PA
me
G
version
1
“““009PA
|”
—-OO9PA
”
V
version
1
|
33,34,
ag|
ZCTDX1020-FBK|
ZCTDXIG-FBK
|
Front
Panel
Ass’y
1
L_
43,45-47
|
ZCTDX1020-CH
|
ZCTDX10-CH
Cassette
Holder
Ass’y
re
a
No.
4277
March
1987
§wOe#

-X102A/B/C/E/G/U/V
A Parts are safety assurance parts.
When
replacing
those
parts,
make
sure
to
use
the
specified
one.
VNN2200-211
VNNO157-301
Instruction
Book
B/E/G
version
VNN2201-621
ae
-901
a
A/C/U
version
VNN2200-901
V
version
VPC2200-002
VPC2141-002
B
version
-
-003
te
-003
A
version
-004
tf
-004
C
version
es
-005
sd
-005
E
version
as
-007
om
-007
U
version
G version
V version
VICTOR
COMPANY
OF
JAPAN,
LIMITED.
AUDIO
PRODUCTS
DIVISION
MAEBASHI
PLANT
10-1,
1-chome,
Ohwatari-cho,
Maebashi-city
371,
Japan
(No.
4277)
Printed
in
Japan
—6203-—-S—

KD-X1 A/B/C/E/G/J/
JVC
SERVICE MANUAL
moo.
KD-
qe
Contents
Safety Precautions .. 1... 0.0.0.0. eee eee 2 Wiring Connections .......... 00.00.2000 eee 12
Spacifications.. 0.0... 3 Enclosure Assembly Parts List ............... 13
Location of Main Parts .................00005. 3 Exploded View of Enclosure Assembly........... 15
Removal of Main Parts............ 000000000 ae 4 Exploded View of Mechanism Assembly ......... 16
Main Adjustment .°........0..0.0.00.0 20000000005 6 Mechanism Assembly Parts List ............. 17
Standard Schematic Diagram................05. 9 ACCe@SSOFIES) yo hei fe te, ae ee ee oa Be Blea 19
P. C. Board Parts and Parts List ............... 10 Packing and packing Parts List
No. 4243
December 1984

KD-X1 A/B/C/E/G/J/U |
Safety Precaution
1. The design of this product contains special hardware.
Many circuits and components specially for safety
purposes.
For continued protection, no changes should be made to
the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be per-
formed by qualified personnel only.
2. Alterations of the design or circuitry of the product
should not be made. Any design alterations or additions
will void the manufacturer’s warranty and will further
relieve the manufacturer of responsibility for personal
injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the product
have special safety-related characteristics. These charac-
teristics are often not evident from visual inspection
nor can the protection afforded by then necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by ( Z\) on the
schematics and parts list in Service manual. The use of
a substitutue replacement which does not have the same
safety characterisitics as the recommended replacement
part shown in the parts list in Service manual may
create shock, fire, or other hazards.
4. The leads in the products are routed and dressed with
ties, clamps, tubings barriers and/or the like to be
separated from live parts, high temperature part, mov-
ing parts and/or sharp edges for the prevention of elec-
tric shock and fire hazard.
When service is required, the original lead routing and
dress should be observed, and they should be confirmed
to be returned to normal, after re-assembling.
2 (No. 4243)
5, Leakage current check
(Safety for electrical shock hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the Pro-
ducts (antenna terminals, knobs, metal cabinet, screw
heads, earphone jack, control shafts, etc.) to be sure the
product is safe to operate without danger of electrical
shock.
Do not use a line isolation transformer during this check.
e Plug the AC line cord directly into the AC outlet. Us-
ing a “Leakage Current Tester’, measure the leakage
current from each exposed metal part of the cabinet,
particularly any exposed metal part having a return
path to the chassis, to a known good earth ground
(water pipe, etc,). Any leakage current must not ex-
ceed 0.5 mA AC (r.m.s.).
e Alternate check method.
Plug the AC line cord directly into the AC outlet. Use
an AC voltmeter having 1,000 ohms per volt or mroe
sesitivity in the following manner. Connect a 1500 Q
10 W resistor paralleled by a 0.15 wF AC-type capaci-
tor between an exposed metal part and a known good
earth ground (water pipe, etc.).
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a
return path to the chassis, and measure the AC volt-
age across the resistor. Now, reverse the plug in the
AC outlet and repeat each measurement. Any voltage
measured musy not exceed 0.75 V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
AC VOLTMETER
(HAVING 1000 2/V OR
MORE SENSITIVITY)
0.15 pF AC- TYPE
1500. 10W PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
GOOD EARTH GROUND

Specifications
Type
Track system
Tape speed
Frequency response:
Note: “1...
bi ee
3
*
S/N ratio
Wow and flutter
Crosstalk
: Stereo cassette deck
: 4-track, 2-channel
: 1-7/8 inch/sec (4.8 cm/sec)
(0 dB recording)
Metal tape *1;
40—11,000 Hz (+ 3 dB)
Chrome tape *2;
40—8,000 Hz (+ 3 dB)
Normal tape *3;
40—8,000 Hz (+ 3 dB)
(—20 dB recording)
Metal tape *1;
30 — 16,000 Hz
40 — 15,000 Hz (+3dB)
Chrome tape, *2:
30 — 16,000 Hz
40 — 15,000 Hz (+3dB)
Normal tape; *3;
30 —15,000 Hz
40 — 14,000 Hz (+3dB)
JVC ME or Equivalent
TDK SA or Equivalent
MAXELL UD or Equivalent
: 58dB (S=1kHz, K3 = 3%,
N = A-Weight, Metal tape)
The S/N is improved by 5 dB at 1 kHz
and by 10 dB above 5 kHz with ANRS/
DOLBY B NR on.
: 0.08 % (WRMS),
0.20 % (DIN 45 500)
: 60 dB (1 kHz)
Location of Main Parts
Rec/PB Switch
Main P.C. Board Ass’y
Power Switch
Fig. 1
KD-X1 A/B/C/E/G/J/U
Harmonic distortion: K3; 0.5%, THD; 1.0 %
(metal tape, 1 kHz O dB)
Heads : METAPERM head for recording/play-
back,
2-gap ferrite head for erasure
Motor : Electronic governed DC motor
Fast forward / Approx. 100 sec. with C-60 cassette
Rewind time
Input terminals
Mic jack x 2 : Max. sensitivity; 0.4mV (—68 dBV)
Matching impedance; 600 2 — 10 kQ
Input jack x 2. : Min. input level; 50 mV
Input impedance; 100 k22
Output terminals
Output jack x 2 : Output level; 300 mV
Output impedance; 5 kQ
Power requirement : AC 240 V, 50/60 Hz (KD-V120 A)
AC 120 V, 60 Hz (KD-V120 C/J)
AC 240/220/110 V, 50/60 Hz
(KD-V120 U)
Power consumption: With power on; 10 W
With power switch off; 0.8 W
Dimensions : 17-1/8" (435 mm) W
4-9/16” (115mm)H
9-3/8” (237 mm)D
Weight : 7.7 lbs (3.5 kg)
Accessories : Pin plug cord...2
Design and specifications are subject to change without notic
Power Transformer
Fuse Power Cord
Mechanism Ass‘y
Rec Safety
Lever
(No. 4243) 3

KD-X1 A/B/C/E/G/J/U |
Removal of Main Parts
Enclosure Section
Removal of Top Cover
1. Remove six screws retaining the both sides of the top
cover.
2. Remove the screw retaining the back side of the top
cover.
Removal of Bottom Cover
1. Remove three screws retaining the front side of the
bottom cover.
2. Remove three screws retaining the rear side of the
bottom cover.
Removal of Rear Panel
1. Remove three screws retaining the jack and chassis
to the rear panel.
Removal of Front Panel
1. Remove the screw @) retaining the left side of the
front panel.
2. Remove the screw (2) retaining the bottom side of
the front panel.
3. Remove the screw (G3) retaining the earth wire with
the mechanism ass’y.
4. Pull out two knobs.
Removal of Mechanism Ass’y
1. Remove the counter belt.
2. Remove three screws (4) retaining the mechanism
ass‘y.
3. Open the cassette door and remove the mechanism
ass’y.
Removal of Tape Counter
1. Remove two screws 6).
Removal of Damper
1. Remove the screw (6).
Removal of Power Switch (See Fig.5)
1. Push the switch knob outward to remove it.
2. Push the switch ass’y in the direction of the arrow to
remove it.
Note: When reinstalling the switch ass’y:
1) Set the switch to its ON position.
2) Fix it as shown in the right figure.
3) Set the knob to the switch.
LED Indicator
Remove
five
pawis
@)
retaining
the
indicator
board
ass‘y.
4 (No. 4243)
Amp.
Board Ass'y
Removal figure
reinstement figure
Fig. 5

Mechanism Section
Mechanical parts
© Rec./PB head
1) Remove 2 screws 3) for the button assembly.
2) Remove a screw 82)
3) Loosen a screw @3) for adjustment.
@ Erase head
1) Remove a screw :
2) Remove a screw for adjustment.
@ Pinch roller arm assembly
1) Remove a stopper holding its assembly, and
pull it off from the shaft.
@ Supply reel disc assembly
1) Pull out the reel disc stopper 67) and remove its
disc from the shaft.
@ Take-up reel disc
1) Pull out the reel disc stopper and remove it
from the shaft.
Note: Remove the reel disc stoppers with a piece of sheet
metal inserted between the reel disc and stopper,
when assembling the reel disc, the stopper needs a
new parts (the stopper cannot be used again).
@ Motor
1) Remove 3 screws ; and fastening the
FM bracket. (When removing the FM bracket 42) F
remove with the main belt and the RF belt
)
2) Remove 3 screws 45) fastening the motor.
3) Pull out the motor pulley from the motor shaft.
Note: Be careful not to stain the main belt and RF belt.
(When assembling the motor pulley, adjust the
pulley position as next figure.)
10.5mm
MOTOR Fig. 6
KD-X1 A/B/C/E/G/J/U
Fig. 8
@ Flywheel assembly
Pull out the flywheel from the capstan metal.
How to assemble the FM bracket and belts
1) Assemble full auto belt and RF belt as next figure.
2) Fasten 3 screws, to assemble the FM bracket.
Full autobelt Main belt FM bracket
RF beit
Flywheel Motor
Fig. 9
(No. 4243) 5

KD-X1 A/B/C/E/G/J/U |
Main Adjustment
[1]
Equipment
and
measuring
instruments
used
for
5)
Reference
tapes
for
playback
(JVC
Test
Tape)
adjustment
VTT703 LL
(for
head
azimuth
adj.)
VTT712
(for
motor
speed,
wow
flutter
adj.)
1.
Electrical
adjustment
V11739
(for
playback
frequency
response}
1)
Electronic
voltmeter
6)
Resistor
600
22
(for
attenuator
matching)
2)
Audio
frequency
oscillator
(range:
30—20
kHz
and
output
0
dB
with
impedance
600
22)
2.
Mechanical
adjustment
3) Attenuator
1)
Torque
testing
cassette
gauge,
CTG-N.
4) Standard tapes for REC/PB
Maxell UD — Norom (SF) tape. . .
TDK SA —Chrome (SA) tape... . — or equivalent
JVC ME — Metal tape.........
[11] Mechanical adjustment
(Adjust the mechanism or confirm that it is in normal operating condition prior to the adjustment of the electrical circuit.)
Item Adjustment Adjusting | Standard Remarks |
point value
Adjusting 1. Connect an electronic voltmeter to Screw (A) Maximum} If the head is worn, disconnected or
record/play back the LINE OUT terminals. exceedingly magnetized so as not to
. Play back the VTT7O3L test tape.
. Adjust the head angle with the
screw @) until the reading of the
electronic voltmeter becomes maxi-
mum for both channels.
4. After adjusting, set the screw with
screw bond.
head position provide the necessary characteristics,
replace it with a new one.
After replacement, the head position
adjustment as well as the playback
level adjustment, the bias current ad-
justment and the recording level ad-
justment are all necessary.
If the output difference between the
left and right channels exceeds 3 —
4 dB, the head is defective. Replace it
with a new one.
WR
Adjustment erase
head height
. Turn the adjusting screw for align-
ing the erase head until it stops.
Then, turn the screw in the reverse
direction by 180° {a % revolution).
2. Employ a special cassette (C-120)
from which parts of the casing,
where the erase head, record/play-
es @) back head and capstan engage, has
| been cut away. Perform tape trans-
© 0) port with the cassette tape. Adjust
the screw until the tape runs in
| the center of the erase head tape
Be sure to perform this adjustment
after replacing the erase head.
Correct Incorrect
4 Tape guide
- Tape guide ~Tape
ae
Tape guide
[=
Semi- 3000 Hz | If the speed meter functions as a wow
fixed and flutter meter, also, connect the
resistor deck to the INPUT terminals of the
in the meter.
motor
guide.
-
Adjusting motor | Connect a speed meter (an electronic
speed counter) to the LINE OUT terminals.
Play back the VTT712 test tape.
Adjust the semi-fixed resistor in the
motor until the reading of the speed
meter is 3000 Hz.
-
4
+
+
+~
SS
Checking
wow
Connect
a
wow
and
flutter
meter
to
0.08%
If
the
reading
becomes
moving
value
and
flutter
LINE
OUT
terminals.
(WRMS)
|
even
if
conforming
to
the
standard,
a
Play
back
the
VTT712
test
tape.
0.2%
re-claim
may
be
raised.
Repaits
are
‘lps
to
see
if
the
reading
of
the
(DIN45500)
|
necessary.
meter
is
within
0.08%
(WRMS).
|
T
Checking
play-
Employ
a
torque
testing
cassette
tape
40-70
If
the
standard
torque
is
not
obtained,
back
torque
for
the
checking,
or
remove
the
cas-
gr-cm
replace
the
take-up
disc
assembly.
| sete
cover
and
use
a
torque
gauge.
ee
6 (No. 4243)

| KD-X1 A/B/C/E/J/G/U
Adjustment Adjusting | Standard Remarks |
point value
Checking fast Measure the torque in the fast forward More than] If the standard torque is not obtained,
forward torque mode in the same manner as in the 70 gr-cm | perform the following.
above. 1. Clean the capstan belt, the idler cir-
cumference, the motor pulley, the
take-up reel disc circumference, the
flywheel circumference, etc.
2. Repiace the belt and idler.
a. SS
Checking rewind | Measure the torque in the rewind mode More than}; If the standard torque is not obtained,
torque in the same manner as in the above. 70gr-cm} clean the capstan belt, idler, motor
pulley, flywheel circumference, rewind-
ing idler circumference, left reel disc
circumference, etc.
[Ml] Electrical adjustments location
Main Amp. P.W. Board (parts assembly side view)
(Turning in the direction of the arrow increases the level.)
MIC JACK
L901
BIAS
Siri
SS) FREQUENCY ch REC CANN SO R142
ears hd
= 57 eee)
= 8104 (15)
5) @1.5) 3)
Lch BIAS ADJ
6ezu!
272)
(72 Ur.
Rch BIAS ADJ
oo i ne Se On
ome) [omeeoemneee |
ss
Po
a
AD)
B20!
Biol
ich
PB. EQ.
ADJ
REC/PB SWITCH
Fig. 10
[IV] Electrical circuit adjustment procedure
In the steps marked by an asterisk (*), adjustment should Adjustment should be performed in the order of steps 1, 2,
be performed, however, only checking is sufficient with Riera Perform this adjustment with the NR SYSTEM
steps other than those. switch set to OFF.
Standard
value
Reference | NR SYSTEM: OFF
Adjusting
point
B100,
Adjustment
Play back Playback test tape VTT739 (1 kHz,
frequency 10 kHz) for following adjustment. 101 frequency:| TAPE SELECT: NORM
response 1. Connect/Disconnect B100 or B101| 8g200, 1 kHz
and B200 or 201 so that 10 kHz 201 O0+2dB
signal and 1 kHz signal gains become at 10kHz
flat response.
(No. 4243) 7

KD-X1
A/B/C/E/G/E/J/
|
Checking
record/
play back
distortion
play back the recorded part,
and check so that Line out ter-
minal level become O + 2.5 dB.
2. If the standard value cannot be
obtained, adjust the recording
level using R139, 140, 141 and
142 in combination (for L-ch),
and R239, 240, 241 and 242
(R-ch), respectively.
. Record a 1kHz, —8dB signal to
LINE IN terminals and perform
recording with the multi-peak
becomes to 0.
2. Play back the recorded part. Check
the output with a distortion meter
to see if the value conforms to the
standard value.
NORM
Item
Adjustment
mes
Ray
Remarks
Checking
Record
1
kHz,
50
Hz
and
12.5
kHz
|
For
Reference
This
checking
should
be
performed
record/
signals
at
an
input
level
of
0
dB
to
|
NORM
frequency;
for
normal
tapes
and
for
both
right
playback
—20
dB.
tape;
1
kHz
and
left
channels.
frequency
Play
back
the
tape.
Lch
B102
1.
Bias
current
adjustment
for
a
response
Check
to
see
that
the
50
Hz
and
B103
cassette
deck
should
generally
be
12.5
kHz
signal
output
deviations
fall
B104
0+3dBat
performed
referring
to
the
record/
within
the
standard
range,
using
the
|
Reh
ee
50
Hz
playback
frequency
response.
1
kHz
signal
output
as
a
reference.
B204
|
0+3dBat
This
is
Sai
the
ein!
i
eas
:
12.5
kHz
sponse
of
a
cassette
deck
depends
i
are
eara
7.
more
greatly
upon
the
bias
cur
=
rent
than
does
that
of
an
open
a
ix
reel
deck.
3
;
2.
If
the
bias
current
is
not
proper-
5
Sven
cea
ete
ly
adjusted,
the
record
and
play-
z
Decrease
in
high
frequencies
back
characteristics
become
as
a
(with
a
larger
bias
current)
shown
left.
50
Hz
1
kHz
12.5
kHz
Frequency
(Hz)
|
——.
3
|
Checking
1.
Apply
a
1
kHz
-23
+3
dBV
Sig-
O+2.5dB
|The
level
difference
between
left
recording
nal
to
the
LINE.
in
terminals,
and
right
channels
for
SF/NORM
level
tape
and
chrome
tape
should
be
less
than 3 dB. Perform the adjustment
using a normal tape, level difference
between recording and playback for
SA/CrO2 and metal tapes, should
be less than 3 dB, and that between
left and right channels should also
be less than 3 dB.
tape; Less
Less than 3%
Metal tape;
Less than 2%
(THD)
following bias current and record-
than
2.0%
ing
level
checking.
CrO2 tape;
Be sure to perform this checking
5 | Checking
signal to
noise ratio
playback
in recording/
2. Play back the recorded part.
1. Record a1 kHz, 0 dB signal.
Stop the input by disconnecting
from the terminal to perform non-
signal recording.
Measure the O dB recording output
and the non-signal recording output
for comparison using an electronic
voltmeter.
Check to see if the value conforms
to the standard value.
NORM,
CrO2 and
Metal tapes; ||
More than
42 dB
Apply an output (—72 dBs) to the
MIC terminals with the recording
evel controls set to maximum so
that the multi-peak indicator be-
comes 0 dB.
Checking
erasing
coefficient
8 (No. 4243)
+
1. Apply a 1 kHz signal to the LINE
2. Perform recording with the signal
3. Erase a part of the recording.
4. Measure the output difference be-
IN terminals. Adjust the recording
level controls until the multi-peak
indicator becomes 0 dB.
enhanced by 20 cB.
tween the erased part and non-
erased part to compare with an
electronic voltmeter.
Ll
More than
65 dB
For the measuring, connect a band
pass filter between the deck and the
electronic voltmeter.
Tape deck
(recording,
erasing)
Input i
(1 kHz OdB
+ 20 dB)
Electronic
voltmeter
Band pass
filter
(1kHz)
: