Hitachi 32UX01S, Руководство по обслуживанию

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Figure A
C945
R949
Q908
R985
To D938
100k
액
1/8W Resistor
R973 R948
+ -
(2) Immediately after checking, disconnect the TV
set power cord.
(3) Discharge C905 as follows.
2~10k
액
more than 15W
(wire would resistor)
R906
C905
+
-
2~10k
액
more than 15W
(wire would resistor)
R906
C905
+
-
3. LOAD SHORT PROTECTION CIRCUIT
OPERATION CHECK.
Adjustment Procedure
(1) Receive circle pattern signal.
(2) Set “CONTRAST” to maximum and
“BRIGHTNESS” to center.
(3) Check the Cathode voltage of D939, D952, and
D953. Confirm the voltage should be more than
1.5V.
(4) Short-circuit both ends of R961 and check that
the picture disappears within 2~3 sec.
(5) Disconnect short-circuit of R961 and the TV set
power cord.
(6) Discharge C905 as follows.
4. WEAK ELECTRIC FIELD CHECK
Adjustment Preparation
(1) Connect one side of the 300 ohm feeder to 75
ohm ~ 300 ohm antenna adapter. Connect the
antenna adapter to the VHF antenna terminal
board as shown below.
(2) Turn to no signal condition.
Adjustment Procedure
(1) Check that the phenomena such as oscillation
and abnormal beat, etc. do not occur in all the
channel.
Antenna Terminal board
75 ohm - 300 ohm adaptor
VHF/UHF
Vl. REMO-CON OPERATION CHECK
1. DIRECT CHANNEL SELECTION
Adjustment Procedure
(1) Input 2 or 3 digits of channel number with the
buttons of the Remo-con “0-9.” Check that the
input number and the on-screen display number
are the same. (At 100CH selection, press “1” and
after 2 seconds, press “0” two times.
1 1
After
2 seconds
2. LST-CH (LAST CHANNEL RECALL)
Adjustment Procedure
(1) Check that the set receiver alternates between
the channel which is being received and the
channel which was previously received with each
press of the “LST-CH” button of the Remo-con.
3. MUTE
Adjustment Procedure
(1) Check that the sound alternates between SOFT
MUTE, MUTE and MUTE OFF by every pressing
of “MUTE” button on the Remo-con. At this time,
check the MUTE indication:
MUTE off
Yellow
SOFT MUTE Magenta
MUTE Magenta
(2) Check that sound level goes to 1/2 level at SOFT
MUTE.
(3) Check that sound level goes to 0 at MUTE mode.
4. RECALL
Adjustment Procedure
(1) Check that on-screen channel no. indication
appears by pressing the “RECALL” button of the
Remo-con.
5. P IN P (36UX01S/32UX01S only)
Adjustment Preparation
(1) Connect signal to ANT A and receive it.
(2) Connect signal to VIDEO: 1 Input.
Adjustment Procedure
(1) Check that with each press of the “PIP” button of
Remo-con, sub-picture alternates between On
and Off. When sub-picture is On, check that the
channel numbers are displayed as below.
ANT A 10
PIP VIDEO: 1
V1