
PN15VT/VO
PN15HT/HO
5-1
5 Troubleshooting
5-1 Parts Level Troubleshooting
Notes:
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
Chirping noise exists?
Check and replace IC601.
Check and replace D601 and FH1
Done.
No
Yes
Repeating start?
Check and replace D606.
No
Yes
IC601 Pin 1 waveform is right?
Check and replace D614, IC601,
Q602 and ZD601.
Yes
No
C622 Voltage is 13 V ± 0.5V?
Check and replace IC201, IC301,
IC401, Q402, Q404,
IC603, Q609,and Q611.
Yes
No
Operate normally?
Replace Main board.
Yes
Verify voltages.
No
WAVEFORMS
1
1
100 V (IC601, #1)
CH1 P-P = 100 V
CH1 RMS = 350.2 V
Summary of Contents for PN15HO
Page 7: ...2 Product Specifications 2 4 PN15VT VO PN15HT HO Memo ...
Page 17: ...Memo 4 Alignment and Adjustments 4 8 PN15VT VO PN15HT HO ...
Page 36: ...PN15VT VO PN15HT HO 6 1 6 Exploded View and Parts List 6 1 PN15VT HT ...
Page 37: ...6 2 PN15VO HO 6 Exploded View Parts List 6 2 PN15VT VO PN15HT HO ...
Page 38: ...6 Exploded View and Parts List 6 1 1 Front Cover CRT Ass y PN15VT HT PN15VT VO PN15HT HO 6 3 ...
Page 39: ...6 1 2 Chassis Stand Ass y PN15VT HT 6 Exploded View Parts List 6 4 PN15VT VO PN15HT HO ...
Page 40: ...6 1 3 Rear Cover Ass y PN15VT HT 6 Exploded View Parts List PN15VT VO PN15HT HO 6 5 ...
Page 41: ...6 Exploded View Parts List 6 6 PN15VT VO PN15HT HO 6 2 1 Front Cover CRT Ass y PN15VO HO ...
Page 42: ...6 2 2 Chassis Stand Ass y PN15VO HO 6 Exploded View Parts List PN15VT VO PN15HT HO 6 7 ...
Page 43: ...6 2 3 Rear Cover Ass y PN15VO HO 6 Exploded View Parts List 6 8 PN15VT VO PN15HT HO ...
Page 72: ...PN15VT VO PN15HT HO 9 1 15 PIN D SUB refer to pin assignment of product spec 9 Wiring Diagram ...
Page 73: ...Memo 9 Wiring Diagrams 9 2 PN15VT VO PN15HT HO ...