Sharp 25WG3, Руководство по обслуживанию

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3
25WG3
ADJUSTMENT PRECA
UTIONS
This model’
s setting are adjusted in tw
o diff
erent w
a
ys:
through the I
2
C b
u
s
control and in the con
v
entional analog manner
.
The adjustments via the I
2
C b
u
s
control include preset-only items and v
a
riab
le data.
1.
Calling the ser
vice mode b
y
the micr
opr
ocessor
.
(1)
Set the s
witch S1006 to the ser
vice mode position, and the microprocessor is
put ser
vice mode
. (Adjustment through the I
2
C b
us control)
(2)
Press the CH UP k
e
y
on the remote controller to get ready to select the mode
one b
y
one
.
(3)
Press the CH DO
WN k
e
y on the remote controller to select the modes re
v
ersely
one b
y
one
.
(4)
Using the
V
OLUME UP/
V
OLUME DO
WN k
e
y on the remote controller
, the
data can be modified.
(5)
Set the s
witch S1006 to the nor
mal mode (OFF) position, and the microproc-
essor is put out of the ser
vice mode
.
2.
F
actor
y Presettings.
(1)
Set the s
witch S1006 to the ser
vice mode position and tur
n on the main po
w
e
r
s
witch.
Initial v
alues are automatically preset only when a ne
w E
2
PR
OM is
used (judgement with the first 4 b
ytes).
(2)
The initial data are preset as listed in page 5~6.
(3)
Mak
e sure the data need modify or not (Initial data).
IMPOR
T
ANT
Note:
Once the chassis has been put together and ready to be PO
WER ON f
or the
FIRST
TIME, mak
e sure to set the s
witch S1006 to the ser
vice mode position
first and then tur
n on the main po
w
er s
witch (See 2-(1) abo
v
e).
IMPOR
T
ANT SER
VICE NO
TES
Maintenance and repair of this receiver should be done b
y
quali-
fied ser
vice per
sonnel onl
y
.
SER
VICING OF HIGH
V
O
L
T
A
GE SYSTEM AND PICTURE
TUBE
When ser
vicing the high v
oltage system, remo
v
e
static charge from it b
y
con-
necting a 10k ohm Resistor in ser
ies with an insulated wire (such as a test
probe) betw
een picture tube dag and 2nd anode lead.
(A
C line cord should be
disconnected from A
C
outlet.)
1.
Picture tube in this receiv
er emplo
ys integ
ral implosion protection.
2.
Replace with tube of the same type n
umber f
or contin
ued saf
ety
.
3.
Do not lift picture tube b
y
the nec
k.
4.
Handle the picture tube only when w
ear
ing shatter
proof goggles and after
discharging the high v
oltage completely
.
X-RA
Y
This receiv
er is designed so that an
y X-Ra
y r
adiation is k
ept to an absolute
minimum.
Since cer
tain malfunctions or ser
vicing man
y produce potentially
hazardous r
adiation with prolonged e
xposure at close r
ange
, the f
ollo
wing pre-
cautions should be obser
v
ed:
1.
When repair
ing the circuit, be sure not to increase the high v
oltage to more
than 32.0 kV (at beam 0
µ
A) f
or the set.
2.
T
o
k
eep the set in a nor
mal oper
ation, be sure to mak
e it function on 29.0
±
1.5kV (at beam 1300
µ
A) in the case of the set.
The set has been f
actor
y-
Adjusted to the abo
v
e
mentioned high v
oltage.
3
.
Do not substitute a picture tube with unauthoriz
ed types and/or brands which
ma
y cause e
xcess X-Ra
y r
adiation.
BEFORE RETURNING
THE RECEIVER
Bef
ore retur
ning the receiv
er to the user
, perf
or
m the f
ollo
wing saf
ety
chec
ks
.
1.
Inspect all lead dress to mak
e cer
tain that the leads are not pinched or that
hardw
are is not lodged betw
een the chassis and other metal par
ts in the
receiv
er
.
2.
Inspect all protectiv
e de
vice such as non-metallic control knobs
, insulating
fishpapers
,
cabinet bac
ks
, adjustment and compar
tment co
v
ers or
shields
, isolation resistor- capacity netw
or
ks
, mechanical insulators etc.