ViewSonic PJ870 Service Manual - Page 79

Inspection, Procedure

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1VIINVIAT aDIMHS P7870 8-4 Inspection Procedure 1) Hi-Pot Test: Hi-Pot Specification : 1.5KVAC, 10mA, 2 second. 2) Noise Test: Incline 30° to the left and right to check whether there is strange noise. 3) Function Test I : (a). Connect PC, Video, S-Vi deo, Audio signal and extension speaker with PJ870. (b). Press source button to switch to PC signal. + Make sure the image is normal. (c). Press Pip button on the remote controller. 4. Make sure the video signal appears on PC signal. (d). Press Pip button to cancel Pip function. (e). Press source button to switch to Video signal. + Make sure the image is normal. (f). Press source button to switch to S-Video signal. + Make sure the image is normal. (g). Press Menu button for 4 times to enter Audio Function OSD. + Select Volume function and make sure the function works normally. 4. Select Mute function and make sure the function works normally. + Select Stereo/Mono function and make sure the function works normally. (h). Disconnect the extension speaker. + Make sure the internal speaker works normally. 4) Function Test II : (a). Connect PC signal with PJ870. *7 Fine Line Morie Pattern : - Make sure the noise can be eliminated by Tracking function. - If there is line bar appearing, make sure it can be eliminated by Frequency function. ViewSonic Corporation [ 8-5 ] Confidential - Do Not Copy

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P7870
8-4
Inspection
Procedure
1)
Hi
-Pot
Test:
Hi
-Pot
Specification
:
1.5KVAC,
10mA,
2
second.
2)
Noise
Test:
Incline
30°
to
the
left
and
right
to
check
whether
there
is
strange
noise.
3)
Function
Test
I
:
(a).
Connect
PC,
Video,
S
-Vi
deo,
Audio
signal
and
extension
speaker
with
PJ870.
(b).
Press
source
button
to
switch
to
PC
signal.
+
Make
sure
the
image
is
normal.
(c).
Press
Pip
button
on
the
remote
controller.
4.
Make
sure
the
video
signal
appears
on
PC
signal.
(d).
Press
Pip
button
to
cancel
Pip
function.
(e).
Press
source
button
to
switch
to
Video
signal.
+
Make
sure
the
image
is
normal.
(f).
Press
source
button
to
switch
to
S
-Video
signal.
+
Make
sure
the
image
is
normal.
(g).
Press
Menu
button
for
4
times
to
enter
Audio
Function
OSD.
+
Select
Volume
function
and
make
sure
the
function
works
normally.
4.
Select
Mute
function
and
make
sure
the
function
works
normally.
+
Select
Stereo/Mono
function
and
make
sure
the
function
works
normally.
(h).
Disconnect
the
extension
speaker.
+
Make
sure
the
internal
speaker
works
normally.
4)
Function
Test
II
:
(a).
Connect
PC
signal
with
PJ870.
*
7
Fine
Line
Morie
Pattern
:
-
Make
sure
the
noise
can
be
eliminated
by
Tracking
function.
-
If
there
is
line
bar
appearing,
make
sure
it
can
be
eliminated
by
Frequency
function.
1VIINVIAT
aDIMHS
[
8-5
]
ViewSonic
Corporation
Confidential
-
Do
Not
Copy