Teac MV1421, Service Manual

Page: 56 / 130

5 4
10. TROUBLE SHOOTING CHARTS
10-1. NO RASTER
10-2. NO OSD DISPLAY
CHECK MAIN B+ ( 123V LINE )
NG.
I806 6Vout ?
Q803 BASE = H ?
CHECK HEAT VOLTAGE,
16.5V, 45V, 190V LINE
SW08,P803 SOLDER ?
TOP210 PIN VOLT ?
D825~D828,F801,R803 ?
PA805 VCR H = H ?
XN01,XN02,X701 OSC ?
RN46,47,48'S PULSE ?
IN01,I701 RESET = H ?
I701 EXCHANGE
5V VCC VOLT ?
PATTERN SHORT ?
IN01,I701 EXCHANGE ?
PA406 MON. ON = H ?
DECK SEPERATION
CHECK T801 SECONDARY
VOLTAGE 8.5V,14V,13.5V ?
CHECK H DRIVE PULSE
AT PIN3 OF PA406
CHECK H.VCC AT
PIN 37 OF I501
X501,X502 OSC OK ?
CHECK Q401,Q402,T401,C418
R401,R402,R407,R409
I301,D301,D302
CHECK DATA,CLOCK AT
PIN 7,8 OF I501.
CHECK PULSE AT PIN 6,13,38
OF I501.
CHECK PULSE R,G,B,FB AT
PIN 18,19,20,21 OF I501
CHECK CONNNECTOR PA904
P401,PA408
DECK EXCHANGE
CHECK I801 #9 VOLT
I801 #7, #1 VOLT
CHECK R817,D801~D804
EXCHANGE I801
CHECK D811 ~ D815
CHECK I802,804,805
OK
NG.
NG.
NG.
NG.
NG
NG
NG
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
OK
CHECK H,V SYNC SIGNAL
AT PIN 45,46 OF I701
CHECK V SYNC
OF P405.
CHECK H SYNC
(SC) OF PA405
CHECK OSD OSC
PULSE.
CHECK I301 AND
ADJACENT CIRCUIT.
CHECK D501
CHECK CONNECTOR
(PA406) AND PATTERN
CHECK L,C or I701 CHECK 23,24,25,26
PULSE AND VOLT
CHECK BRIGHT,CONTRAST
CONTROL = MINIMUM ?
NG NG
NG NG NG
NG
OK
OK