Service manual

Wells-Garnder Color Vector Monitor Guide
Page 24 of 73
NECK (CRT) BOARD PROBLEMS
Symptom: Colors Drop In and Out (ZD500 open on neck board) or Display is too bright
On neck board:
• R515 (broken wire to R531)
• C503 (reversed; may toast R527)
Symptom: No Red
On neck board:
• R500 (open)
• R502 (shorted to nearby component)
• R510 (open)
• R511 (open or wrong value)
• R520 (open; red color can be seen but is very weak)
• R529 (open or wrong value)
• broken wire at R517 control
Symptom: Only Red
On deflection board:
• D802 (reversed)
Symptom: Red Too Bright
On neck board:
• R501 (wired wrong)
• R504 (open)
• Q500 (collector shorted to base)
Symptom: Red does not turn off when dimmed all the way
On neck board:
• Q500 (reversed or broken wire)
• R513 (shorted to C500)
• R519 (open)
• R529 (open)