UNIT WILL NOT TURN ON. DOES NOT TRANSMIT,
1. Blown fuse 1 . Defective microphone jack.
2. Defective power switch. 2. Defective PTT switch on microphone.
3. Defect in power suppLy circuitry. 3. l-Jnlocked PLL circuitry of improper alignment.
DOES NOT RECEIVE SOUND. NO TX MODULATION.
1. Defective external speaker jack. 1. Defective micfophone and/or clrcu try.
2. Bad PTT switch in the microphone. 2. Defect in nrodu ation circLr try.
3. Un ocked PLL circuitry or improper a ignment.
4. Defect in squelch clrcuilry.
5. Defective Tone squelch switch.
ADDITIONAL HINTS
DOES NOT TRANSIM IT.
A. Connect the current meter ln series with power cable and check the current reading lor transrnlt mode.
lf the current reads more than 0.8A (but less than 24) t rneans the t nal o!tput transisto. is OK, so
check for bad contacts or short circults P.C. Board and Antenna Connector. lf the current reads less
than 0.5A, it lndicates there is no drive to fina t.ansistor,socheckdriveorcarlyRFstage
B. Defective PLL?
Check if voltage at the emitter ot TR'11 is less than 4V. f less than 4V, then PLL sunlocked or TF11
is defectlve. lf more than 4V, then PLL ls OK.
C. Short CircLrlt ln Transmltter Clrcuitry?
Voltage at the collector of TR30 should be rnore than 7V (TX mode)
lf voltage reading is less than 7V al the co lector of T830, check D21 or mlcrophone circuitry.
D. lf vo tage is more than 0.5V at the ernitter of TB 14, preceedlng stages are corTect.
DOES NOT RECEIVE,
Before troLrbleshooting, be sure that the squelch control is set ful y counterclockwise and the tone squelch
A. To determine whether PLL is oK, check fo lowings:
1) A frequency ln the range of 150 N4Hz sho!ld be present at TP2 (l.5Vp p or more)
2) The frequencles shown on Frequency Chart should be correct when the channel seLector switch is
changed from CHl through CH40.
B. lf PLL is OK, then check the 2nd loca oscillation (21.855 MHz) at the emitt€r of TR3 (0 5Vp p or
more).
C- lf 1st ocal (VCO) and 2nd local is OK, then check circuitrY throLrgh TR5, TR4, TR3, TF2, TRl and
c1.
D. Defective Audio Power lC?
lf vo tage.eading at the pin 6 o{ lC4 is 7V lVCC/2), 1C4 sho!ld be a I rlght
E. Squelch is on al lhe time
TR16 and/or TRlT are defective if voltage at the base of TRlT is less than 0 5V. li r€ading is more
than 0.6V, check voltage at pln B of 1C3. lf voltage readlng is more than 2V, check lC3 c rcuit.v and/or
squechcontrol volume. lfnoisesqu€lchcircuitisOK,checkD'lTandthetonesquelchswltch
It
