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SOUND TROUBLE-SHOOTING CHARTS
665
To Determine the Cause and Correction of DISTORTION, FAULT LOCATION UNKNOWN
THE TROUBLE TESTS
•
Check all installed meters, all signal lamps, brightness of all filaments (including exciter) and all switch and control settings
2. Check faulty unit per Charts Nos. 10, 13, 17 or 19
3. Correct faulty setting
4. Check if distortion is present with other projector working
5. Proceed per Chart No. 10
6. Listen to determine if distortion is type attributable to improper volume distribution between h.f. and l.f. speakers
7. Check field excitation to l.f. and h.f. speaker banks
8. Check field supply rectifier per Charts Nos. 4, 5 or 12
9. Using ohm meter, check l.f.h.f. filter network wiring and parts, changing condensers if condenser tester is not available
10. Using headphones, check sound at output of each amplifier
I I. Proceed per Chart No. 17
12. Proceed per Chart No. 19
THE CONDITION FOUND
•
All indications normal
Meter reading wrong
Tube filament too bright (or too dim)
Exciter filament too bright or too dim
Signal lamp indication wrong
Control setting found incorrect
TROUBLE FOUND
TROUBLE CURED
Distortion in one projector only
Distortion same, either proprojector
TROUBLE FOUND
L.f.-h.f. volume distribution
faulty L.f.-h.f. volume distribution
not involved No separate l.f.-h.f. speaker
systems
Field excitation values wrong No fault, field excitation
TROUBLE CURED
TROUBLE FOUND
No fault in filter network
Faulty amplifier located
No fault in amplifying system
TROUBLE FOUND TROUBLE FOUND
NEXT TEST
•
No. No. No.
4 2 2
No.
5
No. No.
3
3
No. 5 No. 6
No.
7
No.
10
No.
10
No. No.
8 9
No. 10
No. M No. 12