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SOUND TROUBLESHOOTING CHARTS
659
1
To Determine the Cause and Correction of NO SOUND, FAULT LOCATION UNKNOWN
NOTE: Because of the wide variety of monitoring circuits used today, this chart does not provide for faster trouble-shooting by comparing monitor speaker output with stage speaker output. Such provisions, suited to individual projection room conditions, may profitably be added by fho reader.
THE TROUBLE TESTS
• Check all signal lamps, switch positions, exciter and tube filaments, and all meter positions that can be observed without delay or switching
2. Change to emergency channel
3. Read all permanently installed meters
4. Change to (or make click test on) other projector
5. Run on good projector; check faulty projector output with headphones
6. Beginning with terminals at both ends, check line from head output to changeover switch, using ohm meter
7. Check projector changeover switch for faulty operation, dirty contact, open or short
8. Proceed per Chart No. 8
9. Proceed (in order given) per Tests 6, 7 and 8, above
10. Check with headphones at output line to speakers
11. Check speaker field excitation
THE CONDITION FOUND NEXT TEST
All indications normal Signal lamp not lighted Switch in wrong position Exciter or tube not lighted Meter reading wrong
No emergency channel
Sound restored
No sound either channel
All readings normal Meter reading abnormal
Sound from other projector
normal No sound, either projector
Sound heard in headphones No sound heard in phones Level at head output too low for phones
TROUBLE FOUND No trouble found
TROUBLE FOUND
TROUBLE FOUND TROUBLE FOUND
Sound heard No sound heard
Excitation normal Excitation low or zero
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No.
2
No.
35
No.
36
No.
37
No.
34
No.
3
No.
26
No.
28
No.
4
No.
34
No.
5
No.
10
No.
6
No.
8
No.
9
No. 7
No. II No. 14
No. 12 No. 13