Help notes on the FT101Z/FT101ZD
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** IT SHOULD BE NOTED THAT THERE ARE SEVERAL VERSIONS OF THE FT101Z+ZD, AND
SOME OF THESE FAULTS DO NOT NECCESSARILY APPLY TO ALL VERSIONS.

BLOWING MAINS I/P FUSE : Disconnect PA anode clips to see if one of the PA
valves is S/C. If not, then some of the diodes in the main bridge rectifier
are probably S/C.

INTERMITTENT BLOWING OF MAINS I/P FUSE : If the fuse blows every now and
again, then suspect that one of the PA valves is flashing over once in a
while.

FLUCTUATIONS IN POWER OUTPUT : Check the PA valves. Check the PA anode choke.

SIZZLING/ARCING FROM PA : Check the PA anode choke.

LOW POWER O/P ON SOME BANDS : Check the PA anode choke and also the coupling
capacitor from the PA to the output tank circuitry.

PA UNSTABLE ON HIGHER FREQUENCY BANDS : If the neutralisation is OK, then
check if the 12BY7A driver is glowing blue on transmit - replace if it is.

LOW SENSITIVITY RX : If the marker can be received at the normal level then
suspect the aerial fuse. If the marker signal is low as well then suspect the
PA driver 12BY7A - this shares a signal frequency tuned circuit with the RF
stage. Q8 on the IF board also causes this problem sometimes.

PA TUNING INCORRECT : If the PA won't tune correctly on some of the bands
then check for short circuits on the output tank coil and the nearby wiring.

NO RX : Check the width control is not set at one end (surprisingly common).

NO TX AND NO BIAS : Check accessory plug is in octal socket at back. Check
the PA screen grid voltage - if it is missing check D1002, D1012, and R1006
on Rect.B unit.

NO CW TX : Check Q1003 on Rect.B unit (possibly Q1001 and Q1002 as well). I
have had failure of the CW carrier osc xtal on a couple of occasions.

NO TX 28-30MHz ONLY : Check R8 which is mounted on the band switch assembly
near the driver.

RF FEEDBACK ON 21/28MHz : Some units had a four way tag strip near the mic.
i/p socket - the two centre earth connections should be connected together.

INCORRECT FREQ DISPLAY ON ONE BAND ONLY : Suspect the local osc xtal for that
band.

POOR TX/RX ON ONE BAND ONLY : Local osc xtal as above.

11M RECONVERSION : These rigs were sometimes converted for illegal CB use.
This usually involved replacing 28.5-30 MHz with 26.5 to 28 MHz. A few rigs
are still around in this state, and will require re-converting back to 10
metres. This will require the replacement of the local oscillator crystals,
and re-alignment. Re-alignment should not be omitted, as the rigs may
intermittently fail to operate correctly if it is. Change required local osc
xtals for the original types and the local osc MUST be re-aligned to ensure
continued reliable operation.

HUM ON RX WHEN VOL CONTROL AT MIN : This is usually caused by a hum loop. If
there are two earth braids connected to the v/c then cut one of these.

HUM ON TX : Same as above but on mic gain control.

ONE SEGMENT OF DISPLAY DOES NOT LIGHT : LED U/S. Note these are usually in
sockets and are easily swapped for checking.

INCORRECT SEGMENT ILLUMINATION ON ONE DIGIT : Digit driver IC U/S.

INTERMITTENT INCORRECT FREQUENCY DISPLAY : If on one band only, suspect the
local osc xtal on that band - check alignment of osc before ordering crystal,
especially if fault is on 10m (because it may have beeen used for illegal CB
and not realigned). If on all bands suspect Q04 or Q05 in the counter (later
models) - note that Q04 must be the S version.

INTERMITTENT ROLLING FREQUENCY/PANEL LIGHTS DIM : Suspect a dry joint on the
LT smoothing cap. Also suspect the cap itself.

LUMPY VFO : This is caused by wear of the VFO tuning mechanism. I have tried
a number of times to repair and lubricate this, but always without success,
although it may last a short while.

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