JBL SG520 - Top View

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FIGURE 4-1 TOP VIEW
D. Test tone is OK, but 1. Interchange program audio between each of the low-level (PH1,
program audio is dead. PH2, or MIC).
if all inputs are dead, trouble is in the low-level (Q101-Q103) portion
of the amplifier board (or the TAPE MONITOR switch is on).
2. Program audio is dead. Check for faulty connections to phono-
graph pickup, bad cartridge, or faulty tape read head.
E. Test tone not heard. 1. Faulty test oscillator. To make sure, set TEST TONE switch ON
and connect headphones (or a small loudspeaker) to either of the
front panel OUT TO RECORDER jacks.. Then press the TEST and S$
buttons at the same time. If the test oscillator is operating, the tone
should be heard.
F. No stereo effect 1. Slide BALANCE control to either extreme. If one channel is not
(MODE switch S operating, refer to B and C above.
button is depressed).
2. If both channels are operating, check for any condition which
could cause channel’ mixing. such as defective system cabling,
cartridge, multiplex tuner, or tape deck.
‘RES
mS
TO
GP
CI
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