Service manual

Wells-Garnder Color Vector Monitor Guide
Page 31 of 73
• Q905 (reversed or collector wire broken)
• IC901 (defective, reversed, or unseated pins)
• T901 (pins unseated or primary winding shorted)
• Broken wire at R913
• Broken wire at R919
• Broken wire at base or collector of Q905
• Broken wires or pins at P900
• White wire disconnected at Q900
• Red wire disconnected at Q906
Symptom: If You Are Also Blowing Any Fuses, Check:
• C910 (reversed)
• R907 (open)
• R913 (shorted)
• D902 (wrong value)
• Red and white wires interchanged at Q906
Symptom: F600 Blows Immediately On Powerup
• Replace R612 if open.
Symptom: ZD902 Keeps Failing
The two pins of R918 (HV adjustment), which are in series with R910, must be set between 5K-
6K volts. Otherwise, ZD902 will keep blowing.