F770D Technical Service Manual
Trouble Shooting
1. Introduction
This trouble shooting guide is arranged by fault conditions. Following each fault condition is
a check for a signal on condition to be answered YES or NO.
For NO answer proceed to the right and continue until the fault is located.
For a YES answer continue in the left column to the next numbered check.
Again followed this procedure until the fault is located.
2. Trouble shooting procedure
When Troubleshooting this monitor, some precaution should be observed.
Use a high quality isolation tranformer is capable of providing 3 Amps or more.
Never connect primary ground and secondary ground together including use with an
isolation transformer.
Measure high voltage with respect to chassing ground only, and with a high impedance
prove of 1000 mega-ohm or higher and rated for 30KV DC or higher Measure QH09
collector pulse with a high quality 100:1 probe rated for 1500 volts or higher.
3. Troubleshooting procedure
SymptomCheck(YES)Action(NO)
1) Check for Vsync at pin 41 of ICM01
a) Image isCheck 15 pin D-sub connector, cable,
scrollingZDM02.
.2) Check for positive going Vsync at
Check ICM01, ICH01
pin 2 of ICH01.
3) Will V-oscillator is locked with inputCheck CH01, CH02
signal?
(pin 22 of ICH01)
4) Check V-ramp at pin 23 of ICH01.
Replace ICH01.
5) Check V-out at pin 5 of ICV01.
Check B+ at pin 2,4 of ICV01.
b) Image is1) Check for Hsync at pin 40 of ICM01Check 15 pin D-sub connector, cable,
unstable.ZDM01.
2) Check for positive going Hsync at Check ICM01 , ICH01
pin 1 of ICH01.
3) Will H-oscillator is locked Check CH06, RH06
with input signal?
(pin 6 of ICH01)
4) Check H-out at pin 26 of ICH01Replace ICH01
5) Check for flyback pulse at pin 12 of Check RH10
ICH01.
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ACEC
HYUNDAI
