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G8MNY > TECH 01.10.23 10:32l 64 Lines 2843 Bytes #999 (0) @ WW
BID : 57268_GB7CIP
Read: GUEST
Subj: IC 735 Lamps Mod
Path: IW8PGT<I3XTY<IZ3LSV<IW0QNL<IQ0FO<GB7COW<KE0GB<W9GM<WA2UET<K5DAT<
KD4WLE<N3BYR<WE1H<KA1VSC<GB7CIP
Sent: 231001/0818Z @:GB7CIP.#32.GBR.EURO #:57268 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Mar 223)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
________________________________________________________
³ ÚÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ == == == ³
³ ßßßß == ³ \ ³ ³ Rx 14.273.5 vfo A 12³ _ _ ³
³ /~\ ÀÄÄÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ (_) (_) ³
³ \_/ ____ IC-735 ³
³ ßßß ~~~~~~""""""~~~ /' `\ ßßß /"~"\ [] ³
³ 0 ÜÜÜ |(~) | ÜÜÜ | | ³
³ Þ Þ Þ Þ Þ Þ ³ ~ ³ \._./ [] ³
³ /~~\ ßßß Þ Þ Þ Þ Þ Þ | | ßßß == == == ³
³ \__/ ÜÜÜ # # # # # # [] \.____./ ÜÜÜ [___] [___]³
ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
I now have 3 of these old triple convertion HF PLL rigs, a heavily used one for
/P use, club events, & training courses etc. a spare one, and a cleaner one in
the shack.
SYMPTOMS
There are 4 of these lamps illuminating the meter & the LCD panel. So the odd
blown lamp it is not to bad to use the rig. The lamps are grain of wheat 12V
wire ended & run on about 10V. They have a green cover over each bulb. Unlike
LEDs the light goes 360deg around to illuminate large areas.
PREPING REPLACEMENTS
Having a box of tiny screw 6V SMD white lamps, I set about using them as
replacements....
oÄÄ¿
:~ ~:6 They needed a series 68R so they did not blow up,
: :8 which is soldered from the tip & lead wired towards
____: :R +10V the bulb & then bent sideways. The earth wire is
Gnd øÄÄÄ´ÀÄÄÄ soldered to the case solder point.
³³ ³³Green
Glass³³ ³³Cover
Bulb \\_//
~~~
FIXING IT
Access is fairly straight forward, but a few screws!
1/ Remove power lead, remove top and bottom covers, including the 4 anti
rattle screws around the LS.
2/ Unscrew the 2 front panel Locking screws, and tilt the panel down to access
the wire ended lamps (in PCB holes) and unsolder the blown ones.
3/ If needed for more access, unscrew the 4 screws for PA unit, remove
external Phono Rx patch lead, release the LS lead, RF drive lead from
underside PCB & 2 other connectors to the upper PA unit.
4/ Carefully remove the dud lamps green covers, and put them on the new bulbs.
5/ Cut the new lamp wires to length & tin them. Solder in with the lamps case
on the earth side if possible.
6/ Now put everything on its side, and make power safe, power up the rig and
check for correct lamp function.
7/ Power down and reassemble.
Also see tech buls "IC 735 No RF Output Fault", "IC 735 No PA Bias Fault",
"PA instability in ICOM IC735", "Autocaller with old Maplin kit" & "CW/SSB Rig
Frequency".
Why don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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