JVC TM-41 EG User manual

JVG
Service
Manual
COLOUR VIDEO MONITOR
more.
TM-41
EG/EK
VICTOR
COMPANY
OF
JAPAN,
LIMITED.

JVC Service Manual
move. TM-41 EG/EK
VICTOR COMPANY OF JAPAN, LIMITED.

TABLE OF CONTENTS
1. GENERAL DESCRIPTION
1 INTRODUCTION
2 FEATURES
3. SPECIFICATIONS - i
4 PRECAUTIONS...........
.8 HANDLING
6
7
8
9
CONTROLS AND CONNECTORS ..
POWER SUPPLY .........
RECHARGING THE PBP-1 BATTERY PACK .
CONNECTIONS
2, DISASSEMBLY
.1 TOPCOVER...... wt
.2 POWER CORD ASSEMBL
3 FRONTPANEL....
CRT a sjagts stay etind hte stot
5
6
7 VIDEO/AUDIO BOARD-1.
-8 VIDEO/AUDIO BOARD-2
NRNVNANNYONNN
3. ALIGNMENT PROCEDURE
Bt VOLTAGE (10.5Vj ............0..
PAL COLOR CIRCUIT ADJUSTMENT ..
SECAM COLOR CIRCUIT ADJUSTMENT
PURITY ...... ate
CONVERGENCE ... ae
WHITE BALANCE ...............-4,
SUB-CONTRAST AND SUB-BRIGHTNESS .
SUB-COLOR
WOWKKWYAWWYW
Loamrnoarwon
4.
5. EXPLODED VIEWS AND PARTS LIST
5.1 SAFETY PRECAUTION
5,2 GENERAL RULER FOR NUMBERING METHOD OF SCREW/WASHER/E-RING . .
5.3) GENERAL: ASSEMBLY © 22:2. .0e°sfese eis 2 aoma ie nqiestin a bd: ogo abe ade a to ates ergeS gostei a
6. . DIAGRAMS-AND. CIRCUIT BOARDS
6.1 BLOCK DIAGRAM ............ Sea becers) fe eee oD ieae Wg we die S SOE a ase SMT aE 6-1

7.
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waVNonhwnu
ELECTRICAL PARTS LIST
MAIN P.W.B. ASSEMBLY
PAL/SECAM PB P.W.B. ASSEMBLY
POWER P.W.B. ASSEMBLY
VIDEO/AUDIO BOARD-1 . toate
VIBDEO/AUDIO BOARD-2........
POWER SWITCH P.W.B, ASSEMBLY
VOLUME P.W.B, ASSEMBLY .....
CRT SOCKET P.W.B. ASSEMBLY ..
COLOR SYSTEM P.B.W. ASSEMBLY
10 L.E.D. P.W.B. ASSEMBLY ......,-.-0-05
.11 JACK P.W,B, ASSEMBLY ... 0.2.0... 2 eee ee
W

SECTION 1
GENERAL DESCRIPTION
1.1. INTRODUCTION
This manual provides service information for the JVC
TM-41EG/EK Color Video Monitor. The manual de-
scribes the instruction and adjustment of electrical
operation. Service procedures given herein cover only
field maintenance services.
Adjustments which require high-level instruments, jigs
and techniques are excluded, since they should be per-
formed at the factory.
Due to design modifications, the service procedures and
data given in this manual are subject to posssible change
without prior notice.
WARNING:
TO PREVENT FIRE OR SHOCK HAZARD, DO
NOT EXPOSE THIS UNIT TO RAIN OR
MOISTURE.
POWER SYSTEM
The operating voltage of this set is preset to 220 V
~(EK-version: 240 V~\} at the factory.
Before connectiong to mains, check that the vol-
tage selector on the rear panel is set to the same
voltages as your local mains supply.
Adapting to local power line
This set operates on either 110, 127, 220 or
240 Vv. The voltage selector can be reset as
follows. Turn the voltage selector using a screw-
driver until the proper voltage appears at the
cutout.
r
IMPORTANT {In the United Kingdom)
Mains Supply (AC 240 Vv, 50 Hz only)
IMPORTANT
Do not make any connection to the Larger Ter-
minal coded E or Green, The wires in the mains
lead are coloured in accordance with following
code:
[ees Blue to N {Neutral} oF Black
_ = Brown to L (Live) or Red
If these colours do not correspond with the
terminal identifications of your plug, connect as
follows:
Blue wire to terminal coded N (Neutral) or
coloured Black. Brown wire to terminal coded L
(Live) or coloured Red.
Connection to the mains suppiy |
MAINS POWER SWITCH
The mains power switch is located on the rear
connector panel, Setting this switch to OFF
removes all applied power from the unit.
1.2 FEATURES
® PAL/SECAM switchable colour system with a three-
position switch for PAL, AUTO and SECAM.
@ Compact, lightweight and handy to use.
®@ A G-inch (13-cm viewing area) in-line black stripe
picture tube capable. of accurate, well-defined
colour reproduction.
@ Flexible AC/DC power supply — household AC or
built-in exclusive rechargeable battery pack —
enabling both indoor or outdoor use.
@ Built-in speaker enabling simultaneous audio and
video monitoring.
@ Dual circuits provided for audio and video signals.
® An LED indicator to warn of jow battery power.
® Recharging of the exclusive battery pack PBP-1
(optional) is possible with the AA-PATEG/EK/S AC
Power Adapter (optional).

1.3. SPECIFICATIONS
: Colour video monitor
: PAL/SECAM switchable
+6” (13-cm viewing area)
2 110/427/220/240 V AC, 50 Hz
12 V DC {exclusive battery
pack PBP-1}
: 26 W (AC)
14 W (DC) {about 1.5 hours
with a fully charged battery
pack)
11 Vp-p (2 circuits}
Input impedance — OPEN/75
ohms selectable
1 Vp-p, 75 ohms
—6 dBs (more than 50 k ohms)
1-6 dBs
: 77 mm dia, (16 ohms)
+ 500 mW
110° C to +40° C
: 10° C to 70° C
: 22.0(W) x 13.5(H) x34.5(D) cm
r4..kg
: Hood, Power cord, Earphone
Auilio cable, Video cable
Type
Colour system
Picture tube
Power requirement
Power consumption
Video input
Video output
Audio input
Audio output
Built-in speaker
Speaker output
Operating temperature
Storage temperature
Dimensions
Weight
Accessories
Design and speciticarians subject to change without notice,
1.4 PRECAUTIONS
vent inflammables, water and metallic objects
: entering the unit.
® Do not remodel or disassemble the unit. As the unit
incorporates circuitry generating high voltage,
physical danger and malfunctioning of the unit itself
may result.
@ Remove the AC power cord from the AC outlet when
you are not using the unit for a long period.
@ Do not damage the power cord, This could result in
electric shock,
1:5 HANDLING
® Do not apply shocks or vibrations. Malfunctioning of
the unit is likely to result,
@ Do not place the unit near appliances generating
strong electric or magnetic fields.
Noisy or unstable pictures are likely to result.
® Do not use it in extremely hot places. Exposed to the
direct sunlight for a !ong period of time or placed
near a heater, the cabinet could become deformed, or
1-2
the performance of the internal components may
deteriorate. Special attention is required in summer.
Inside a closed car the temperature can climb to as
high as 80° C in the summer sun.
@ Keep the monitor clean by wiping the cabinet and the
CRT screen with a piece of soft cloth. Do not apply
thinner or benzine. These chemicals can damage the
surface finish and cause printed letters to be erased
Ciean excessive soiling with a diluted neutral cleanser,
then wipe away the cleanser with a dry cloth.
® Do not block the ventilation slots.
For outdoor usage
Apply a screen hood (provided) outdoors to eliminate
reflections
The monitor can be inclined by erecting the stands on
the bottom,
Fig. 1-7
1.6 CONTROLS AND CONNECTORS
1. BRIGHTness control knob
Tur counterclockwise to darken the picture and
clockwise to illumine it.
2. CONTRAST control knob
Tum counterclockwise to soften contrast anc
clockwise to sharpen.
3. COLOUR control knob
Turn clockwise to deepen the colour tone and vice
versa.
4. TINT control knob
Turn counterclockwise to emphasize reds and
clockwise to emphasize greens, Normally set this
knob to its center click-stop position.
5, EARPHONE jack.
Plug in the provided earphone; audio monitoring is
possible.
6. BATT ALARM indicator
This iamp lights green while the unit is being
operated on AC power. If this lamp lights red
during battery operation, it indicates that the
battery pack installed in the unit is nearing the end
of its power. Immediately recharge the battery
pack or replace it with @ fresh one.

Fig. 1-2 {a}
13°14
15 16
Fig. 1-2 (b)
INPUT SELECT “VTR™ switch
Push this switch to monitor audio and video
signals from a unit connected to the VTR input
terminals of the rear panel.
INPUT SELECT “LINE” switch
Push this switch to monitor audio and video
signals from a unit connected to the LINE input
connectors B and @4) on the rear panel.
OFF/VOLUME control knob
Turn this switch clockwise dill it clicks for power-
ing the TM-44EG/EK. By turing the knob further
you can adjust the volume of the audio. Turn the
knob fuliy counterclockwise to remove power
from the.unit. Make it a rude to put this switch in
the OFF position after operating the unit and
before recharging the installed battery pack.
10.
Ww.
12,
13.
7
Battery compartment
Install the exclusive PBP-1 battery pack (optional)
here.
MAINS POWER switch
Switching ON applies mains power to the set. To
switch off the set completely, set the power switch
to OFF,
AC IN © socket
Using the provided AC power cord, connect the
AC IN terminal of the monitor to an AC outlet.
When this terminal is being used, the installed
battery cannot be employed. Make it a rule to
unplug the power cord from this terminal when
employing the exclusive battery pack.
VOLTAGE SELECTOR
To reset the operating voltage, see “POWER
SYSTEM” page 1-1.

15.
16.
17,
18,
19,
20.
24.
22,
23.
24.
25.
26,
27,
DC IN 12 V/CHARGE socket
Recharging the installed battery pack is possible
by connecting the DC output plug of the AA-
P41EG/EK/S AC Power Adapter to this terminal.
H. HOLD control
Turn counterclockwise when the picture is slanting
to the right and clockwise when slanting to the
left.
V.HOLD control
Turn in either direction to stop vertical rolling of
the picture.
HEIGHT control
Turn in either direction to adjust the picture if
it's too narrow or elongated, using a screwdriver,
VTR (8-pin) connector
Connect the monitor to the video/audio monitor
terminal of a VTR or other video sources.
VTR 75 22 termination switch
Set this switch to 75 Q to terminate the input
signals of the VTR connected to the 8-pin
connector (8) or set it to OPEN to make these
signals available at the VTR AUDIO and VIDEO
inpuvVoutput connectors @Q and QD .
VTR AUDIO input/output DIN socket
VTR VIDEO input/output connector
Connect the audio and video outputs from a video
tape recorder or other video sources to these two
connectors. Or use these connectors to produce
signals bridged from the VTR connected to the
8-pin connector B
PAL/AUTO/SECAM colour system select switch
PAL: — Set to this position when the input signal
conforms to PAL.
AUTO: The circuit is automatically switched
either for PAL or SECAM depending on
the input signal. This position is sufficient
for most purposes.
SECAM: Set to this position when the input signal
conforms to SECAM,
VIDEO LINE IN
AUDIO LINE IN DIN connector
Connect the audio and video outputs from a video
tape recorder or other video sources to be
monitored to these two connectors.
OUTPUT VIDEO connector
OUTPUT AUDIO DIN socket
Use these connectors to produce audio and video
signals being monitored with the front panel input
select switches or bridged from the LINE
connectors @3 and @3) .
75 Q termination/OUTPUT select switch
Set this switch to 75 82 to terminate the input
signals connected to the LINE VIDEO IN and
AUDIO IN connectors @3 and @4) . Or set this
switch to OPEN BRIDGE OUT when you wish to
make avilabie at the OUTPUT VIDEO and AUDIO.
connectors @5 and @6) signals connected to the
LINE connectors @3 and @4) .
(“Fe smionitor etgnals applied to the &-pin VTR
connector’
(8
or
the
audio
and
video
inpury
|
output connectors @Q and @}) , push the front
penel INPUT SELECT “VTR” switch,
|
To
monitor
signals
applied
to
the
video
and
|
audio
LINE
connectors
@3
and
@4
,
push
the
!
front panel INPUT SELECT “LINE” switch.
1.7 POWER SUPPLY
Using an AC outlet
Plug the provided power cord into an AC outlet.
Fig. 1-3
The monitor cannot be powered from the battery ]
pack if the power cord is plugged into the |
Monitor. Make sure the power cord is discon- |
nected from the monitor before the battery pack |
is used.
i 7 J
Installing the exclusive PBP-1 battery pack:
1.
Loosen
the
screw
of
the
battery
compartment
cover
on
the
rear
panel
of
the
unit
and
remove
the
cover.

2. Insert the battery pack with its cord outward and Power Adapter can recharge two PBP-1. battery packs
the blue ribbon on top of the battery pack. simultaneously; one installed inside the monitor and the
other separate from the unit — a spare battery.
ee : 1. Plug the provided power cord into the AC IN
terminal of the AA-P41EG/EK/S. Connect the AC
Power adapter to an AC power supply.
2. When the battery pack installed within the
monitor is to be recharged, connect the DC output
cable of the adapter to the DC IN 12 V/CHARGE
connector,
3. The monitor should be set to OFF. The battery
cannot be recharged unless the OFF/VOLUME
Fig,
1-5
control
knob
is
positioned
at
OF
F.
3. Plug the battery cord into the socket near the
opening and replace the cover,
Fig. 1-8
4, When a spare battery pack is to be recharged
simultaneously, connect the PBP-1 battery pack to
the EXT BATTERY terminal of the adapter,
— ca
If the BATT ALARM indicator should tight red
after installing the battery pack, recharge or
replace the battery pack with a fresh one, A
battery pack running out of power should be
recharged immediately.
Fig. 1-9
1.8 RECHARGING THE PBP-1 BATTERY PACK 5. Set the adapter’s power switch to ON. Recharging
will begin.
The AA-P4TEG/EK/S AC Power Adapter is required to 6. Check the charging condition with the meter
rechange the exclusive PBP-1. The AA-P41EG/EK/S AC provided on the adapter.
Fig. 1-7

Meter select switch
VCR BATTERY:
to check the charging condition of the battery pack
installed in the monitor.
EXT BATTERY:
to check the charging condition of the battery pack
directly connected to the AC power adapter.
NOTE:
® About 8 hours are required to fully charge the
5 battery pack, However, it is recommendable to con-
How to check the charging condition tinue charging a little longer fabout 10—12 hours).
1. The meter needle deflects to the right when
charging
starts.
Exclusive
PBP-1
battery
pack
® Do not short-circuit the outer rim of the piug to ‘ts
centre pin.
@ Even when you are not using the battery pack for a
long period of time, recharge it from time to time
This is because the battery pack will gradually dis-
Fig.1-11 charge by itself.
e @ Ajways recharge the battery pack after use and store
2. The meter needle deflects towards the left as it 100% charged.
charging proceeds. @ Once the battery pack is fully discharged, it becomes
unusable.
@ The PBP-1 is a lead/acid battery. Therefore, when it is
used at temperatures below 5° C (41° F), its capacity
may be reduced as much as half.
Fig. 1-12 aft
3. When the meter: needle points to FULL, the
battery has been fully charged,
on
Plug 1
1.9 CONNECTIONS
Using in combination with a JVC VHS recorder
The TM-41EG/EK is most convenient when you use it in
combination with a portable recorder and camera to
Fig. 1-14 monitor camera work when operating outdoors.
Meter select switch