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5 Troubleshooting
5-1 Parts Level Troubleshooting
Notes: 1. If a picture does not appear, fully rotate the brightness and contrast controls clockwise and reinspect.
2. Check the following circuits.
• No raster appears: Power circuit, Horizontal output circuit.
• High voltage develops but no raster appears: Video output circuits.
• High voltage does not develop: Horizontal output circuits.
5-1-1 No Power Supply
Check and replace D601, FH1
Chirping noise exists?
No
Repeating start?
No
IC601 Pin 1 waveform is right?
1
Yes
C622 Voltage is 13 V ± 0.5V?
Yes
Normal operation
Yes
Verify voltages.
Yes
Done.
TP17LT
Yes
Check and replace IC601.
Yes
Check and replace D606.
No
Check and replace D614, IC601,
Q602, ZD601.
No
Check and replace IC201, IC301,
IC401, Q402, Q404.
No
Replace Main board.
WAVEFORMS
1
100 V (IC601, #1)
CH1 P-P = 100 V
CH1 RMS = 350.2 V
5-1
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Table of Contents
Troubleshooting
