Lack Of Synchronization; Horizontal - NEC MultiSync 3D JC-1404HME Service Manual

3. LACK OF STABLE SYNCHRONIZATION
(3-1)
HORIZONTA L
NG +5V, +12V REG FAILURE
I
-
REFER TO ITEM (2-2-1
I
CHECK +5V, +12V
l
OK
,
CHECK H. SYNC MEASURE THE DC VOLTAGE OF CN-M 3 PIN
(TTL POSITIVE PULSE)
ON THE SUB UNIT, "0.22~0.36VDC"
NG
I
CHECK INPUT H. SYNC TTL: MEASURE CN-A 11 pin
ANALOG: MEASURE CN-A 12 pin
ANALOG SYNCONG: CN-A 4 pin
OK SUB UNIT
-
FAILURE
NG SIGNAL CABLE FAILURE
OK
-
SIGNAL GENERATOR FAILURE
,.
CHECK +18V, -12V
I NG
+18V REG, -12V line FAILURE
-
-
SEE ITEM (2-2-1)
,, OK
CHECK INPUT H. TRIGGER
MEASURE THE VOLTAGE WAVEFORM OF TP501
OF IC401
NG
-
H. PHASE CIRCUIT FAILURE
-
(0501, 502, IC501, IC502, etc.)
DIGITAL CONTROL CIRCUIT FAILURE
REFER TO ITEM
(4-1)
OK
DIGITAL CONTROL CIRCUIT FAILURE
-
(IC151 ~156, etc) -
H-F/V CIRCUIT FAILURE
REFER TO ITEM (4-1
I
-33-
•1: ..
,\··f
-. 1
'n
•+-
-1. ~• ,,.