Troubleshooting - Radio Shack MPA 31 Owner's Manual

TROUBLESHOOTING
Your N^A-31 Ampfifier ^KuJd require vay fittte maintenaiiue. If yoj do have prob-
lans, refer to ttis chat for posatde adutiars. If yoi csffnot soto the probton, cot-
tact your locd Radto Shack ^ore tor assstance.
Nottwig works
No signal from
an audio mpiA
source
Hum from PHONO
Hum trom other inputs
Feedtiack "squeate"
Ampfifier
ovwheats
Weak spe^a-
r^xjnse
If you are ifiing AC pcmer.
- Qeck tiie AC tase (an tte track peffei). ff t t s fuse is btanm.
r^idace it witii a 2-An^, 2S0-ydi t e e ( a e T^qafBcgrg the
Ampfifier's Fuse' on Page 10).
- CtTBck to rreisaatsethBAc auflet hee pouKr.
- Ctitsjk ttm powoi!) conneaians to tne rest ot atn s^saenx (ttim-
tatte, QD pdaya-, tur^, ete.)
If you are usng vehide ballery povra:
- Qieck ttce DC cahlR's fii-frie ftos. If tte fuse B tiOiai, replace
it \ASBi a 4-Mnp, 1S-Vatt fuse ( s e Ttupauny Um DC Cauu s
Fise" on P a ^ 10).
- Cteck to rr^ce sue the velide boUuy IBS pa!t&.
- QitHjK to n'QKe sure tre u u aoapier e > picqjuiiy cwuviaBU.
Make sure nane af tte s p m k g vmr\Q, iiiiuupImB cables, or
ultier cuiiiiticuiiy ijiiiinfi am oeiective.
Qieck the corrtrol setting.
Check trie coiviectKuis between Die ampfier and Ihe ffiput
source.
Make sure a microphone is not ddectrve.
Connect ttie tumtabte's grourwl wire (usirfy tibck or green) to
one of ttie (2*03 screws on ttie tack of tiie ampfifier.
Make sure ttiere are no tow level infxils connectal to tt«
PHONO/AUX.a3 jack.
Move trie nucroptione furtrisr a>«ay from trie output qaeakers or
useadrecttoral iniaophone.
Adjust Uiti TONE cuiitfuls if necessary.
Be suie you Imve puviued arlRfpHlB vaitdauon tu ttie aiiipSfiei.
Be sure you ccrrectiy cakaj^ted ttie total spe^et mipedanui.
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