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DM-1 TROUBLESHOOTING SYMPTOMS, and ACTIONS
(See
dewing Page 02-061
SYMPTOM
Suspected failure of DM-1.
(Power L.E.D. does not blink
twice when AC Power is ap-
@ied.)
"
M-l
boots up OK but TV doe:
ot turn on. (Power
LED blinks
twice when AC Power is ap-
plied).
Chassis powers on, OSD pre-
sent but no video.
powers on, but no
LED blinks twice
hen AC Power is applied,
:
ideo from
ATSC/BSS
plays
OK, but RF NTSC does not
lay.
ACTION
COMMENTS
PWR-FAIL
must be
1
>20vdc. Check all pow
supplies (+5, +3.3, -5,
+I2 & +33VDC) from
PTV to DM-1.
(See drawing)
PMQ-2,
.er
ower
L.E.D.
blinks
when
AC
Pwr.
oots up properly.
PMQ-3
Check communications
activity between
DM-1.
& M-l turns on PTV
PTV on PMS-2
(See drawing for pin #Is).
1. Check signal sources.
2. Apply
ATSC/BSS
signal, check for
"Link Locked
LED"
(inside DM-1).
3. If Link LED is on (Link
Locked), check
2H-Y, H&V at PMZ.
'unctional DM- 1 will
generate OSD with-
xrt a signal source
attached.
functional DM-1
Check 2H-Y, H&V at
ill always make
PMZ (See
drawing).
If
SD if chassis is OK,
signals OK, trouble-
i
ust press button
shoot
PTV
chasssis.
n remote to see
OSD.
1. Check
RF NTSC
signal
source.
2. Check
NTSC
composite video at
PMT- I (See drawing)
3.
Check Sync, Y, R-Y &
B-Y at PMS-2
I
1
.
PAGE 02-07
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