Service manual

Wells-Garnder Color Vector Monitor Guide
Page 28 of 73
Symptom: Top of Q901 Blowing Off
• R902 (open)
• Q900 (inserted or wired wrong; if emitter shorted to base then Q901, Q902, and ZD901
get fried)
• Q901 (shorted)
• Q902 (shorted)
• ZD901 (shorted)
Symptom: Top of Q902 Blowing Off
• Q901 (reversed)
Symptom: R901 and R907 are Smoking
• Q902 (shorted)
• Q906 (red and white leads interchanged)
Symptom: Only R901 Smokes
• Q906 (inserted wrong)
• Q900 (missing spacer or black lead open)
Symptom: R903 Smokes
• Q900 (shorted; will short ZD901, Q901, and Q902, too)
Symptom: R904 Smokes
• Q902 (shorted)
Symptom: R907 Smokes
• C902 (reversed)
• broken wire near R902