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RICHARDSON'S BLUEBOOK OF PROJECTION
To Determine the Cause and Correction of NO POWER OUTPUT FROM RECTIFIER
NOTE A: Whenever steps 5, 7, 12, 14 or 17 prove necessary, check for high line voltage as possibly being the basic cause of the difficulty.
NOTE B: Whenever steps 5 or I 7 prove necessary, fuse the new transformer temporarily (if permanent fusing is not provided) to protect it in case an undiscovered short circuit still remains.
THE TROUBLE TESTS I. Inspect tubes
2. Inspect plate circuit fuses
3. Check plate transformer voltages
4. Check for open between transformer and power source
5. Replace plate transformer
6. Check for open between transformer and reck'Jicr output
7. Replace burnt out fuse
8. Disconnect load, again replace fuse
9. Check load and connecting lines for short circuit
10. Open power switch, discharge all condensers with insulated screw driver, feel all parts for over-heating, sign of short circuit
11. Check or replace condensers one by one
THE CONDITION FOUND
• Tubes lit Tubes out
Tubes lit, no blue glow (gas tubes only)
Fuses good
Fuses out
No plate circuit fuses
No input or output voltage Input voltage normal, no
output voltage Voltages normal
TROUBLE FOUND
TROUBLE CURED TROUBLE FOUND
Fuse doesn't hold TROUBLE CURED
Fuse holds
Fuse doesn't hold
TROUBLE FOUND
TROUBLE FOUND No short circuit found
NEXT TEST
• Test No. 2 Test No. 12 Test No. 2
Test No. 3
Test No. 7
Test No. 3
Test No. 4
Test No. 5
Test No. 6
TROUBLE CURED
Test No. 8
Test No. 9 Test No. 10
Test No. 1 1