
Symptom Causa/Remad
VHF Lo (Mid) band does not opecate. but Aircraft,
t.
Detective
Dl,
02, T1, T2 tuning circuit andJor
06,
07
VCO
VHF Hl, UHF Lo, and UHF Hi bands operate. circuit Rëplace thc detective components.
aDe/ectlve
014
and/or esseetatee circuit: Reptace the detective
components.
Aircralt band does not operate. but VHF Lo, VHF tnetecnve
08.
T3, T5, and/or essodeted drcult: Replace the
Hi, UHF
to.
and UHF Hl bands eperats. oetectfve components.
,Defective AM IF Amp., including
024
and
025:
Replace fhe
detective components.
aDefective
014
in band switch circuit: Replace the cetecnve
cemponem\$.
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______
0_- ----
VHF Hi band does not eperere out VHF Lo. Air- 1. oetecnve
03,
09, T4, T6, end/or aesocieteo circuit: Raplace
cratt, UHF Lo, and UHF Hl bands eperato. the defective components.
2_
Detective
013
in band switch circuit: Replace the defective
cemponen\8.
UHF Lo band does net Opefale, but VHF Lo, 1. Detective
04, 05.
and/or assocteted circuit: Replace
ue
de-
Alrcratt, VHF Hl, end UHF Hl bands cpcrate. feoflve components.
,Deteofive Q12 in band switch circuit: Replaoe the defeotive
componenls.
...
UHF Hi band does not operate, but VHF Lo, tDetective
015-17,
020,
,mdlor eeecceiee circuit: Replace
Alrcratt, VHF Hl, and UHF Lo bands cperate. the detective corroonents.
2. oerecnve
018,
019
vea
circuit:
neeace
the defeotive cem-
ponents.
3. Deleclive
012
end/or assodated circuit: Replace fhe de/eotlve
components.
"Zeromatic" does notoperale or holds on a drifted 1. Defective IC3. IC4. and
027
In Zeromalic circuit Raplaca tha
fraquancy during Baareh operalion. dalective componenta.
,Diacriminator coil is out ol edjustment: TP6 sren have ap-
proximately
2_0
V in normal receiving mode. Raler to "ReI-
erenee Frequency
oac
Alignmenl" on Page 9.
Nole:
Puises generat6'Ó while checking circuits and/or certain combinations
ol
kay eperation may eaus.. ;mproper eoerenen.
To clear mejtuncücns, rë-Inltlallza tne
epu:
Push Ihe RESET switoh while pressing CLEAR, and thën release the
RESET switch. All ehannela (100 eh) will be
cesree
and the trequency Ind[oator displays 000.0000. (Be sure tha
power is on while
ra-initiali~ing
the
epu.)
--17-