Hitachi 32UX01S, Service Manual

Page: 32 / 92

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Adjustment Procedure
(4) Check that all sound setting modes return to
delivery settings by pressing
왘
button.
AUDIO MENU
M E N U T O M E N U B A R T O Q U I T E X I T
72%
50%
SET UP CUSTOM VIDEO AUDIO THEATER
F A V
I D
B A S S
T R E B L E
B A L A N C E
R E S E T
A D V A N C E D
S E T T I N G S
V O L U M E
C O R R E C T I O N
Adjustment Preparation
(6) a. Input stereo sound signal to VIDEO: 1
terminals, and set “VIDEO: 1” by Input button.
b. Set to SURROUND menu (THEATER menu):
Adjustment Procedure
(6) Check that sound becomes louder when set
to on mode by
왖
,
왔
button.
THEATER MENU
M E N U T O M E N U B A R T O Q U I T E X I T
SET UP CUSTOM VIDEO AUDIO THEATER
F A V
I D
S U R R O U N D O N
V. DEFLECTION CIRCUIT PICTURE ADJUSTMENT
OPERATION CHECK
1. HIGH VOLTAGE LIMITER CIRCUIT OPERATION
CHECK AND OVER VOLTAGE PROTECTION
CIRCUIT OPERATION CHECK.
Adjustment Preparation
(1) Connect a high voltage voltmeter between CPT
anode terminal (Anode cap side) and the ground
as below.
(2) Set AC input voltage to 120
앐
3V.
(3) Receive circle pattern and set “BRIGHTNESS”
and “CONTRAST” to max.
Adjust Screen VR so that beam current is
I
B
앐
0.1mA. (The voltage of ABL terminal-C747
both ends should by 12V or less.)
Adjustment Procedure
(1 ) Check that the normal high voltage and +B volt-
age as below.
CHASSIS EHT
앧
1KV 1
B
앧
0.1mA +B
36UX01S/36GX01B 30.0
앧
1KV 1.7
앧
0.1mA 140
앧
0.3V
32UX01S/32UX01B 29.0
앧
1KV 1.5
앧
0.1mA 140
앧
0.3V
Use the voltmeter of input impedance 10M
Ω
or more
with indication to the first decimal place.
Digital Voltmeter
High Voltage Voltmeter
(DC Voltage Divider)
CPT GND WIRE
CPT
Anode
CPT
(2) Connect a 2.2k
액
1/8W Resistor to both ends of
D703 and check that power is turned off.
2.2k
액
1/8W Resistor
R704 D703
To D704
Resistor
+56V
(3) Disconnect the AC plug and remove 2.2k
액
1/8W
Resistor.
2. FBT PROTECTION CIRCUIT OPERATION CHECK
Adjustment Preparation
(1) Set “CONTRAST” to maximum, “BRIGHTNESS”
to center.
Adjustment Procedure
(1) Connect a 100k
액
1/8W Resistor between Q908
base and ground, check that picture disappears.
See figure A.