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Mode (Khz) TP2 Voltage
VGA(31.5KHz) 70V
S.VGA(37.8KHz) 87V
VESA S.VGA(48KHz) 108V
XGA(56KHz) 119V
Hf=64KHz 140V
68.7KHz 151V
  NEI Nationwide Electronics Inc.
Tech Tip of The Week
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SERVICE BULLETIN: DELL

Models:

CMC-1509B

Symptom(s):
Trouble in Horizontal output circuit (no raster)
   |
Is B+ line volate normal?
Trouble in power supply unit.
   
Is Q500 base waveform normal? Trouble in FBT
   
Is Q503 Gate waeform normal? Trouble in Q503, T501
If the holddown circuit stops the horizontal oscillator during the check, turn off the power then turn on again about 10 seconds later.
   
Is IC501 21 pin H.OSC waeform normal? Q503 and its ambient circuit
   
Is IC501 pin 18 voltage about 12V? Trouble in power supply circuit
   
Is the input H.Sync cirrect? Trouble in H.Sync
   
Trouble in IC501.