28 Nov
2007
28 Nov
'07
11:56 p.m.
Hi Tony and all
Can I confirm that just the CRT -- the 'glass bottle' was swapped. The
point is that some people use 'CRT' to mean 'monitor. I doubt a service
engineer would do that, but I am, after all, hearing this second- or
third- hand.
What is the observed synmptom? Nothing on the screen at all? do you have
a seervice manual/schematic.
Normally CRT faults are quite easy to diagnose. The main ones are :
Open-circuit heater (check with an ohmmeter betwen the heater pins with
the basee connector unplugged
Inter-electrode shorts or leakage (look for crazy electrode voltages only
when the CRT is connected).
Cracked.broekn glass letting the vacuum out.
Why do you suspect that the CRT has failed? Have
yoy actually tested it
(e.g is the heater open-circuit?)
K, here's the story. The machine is about a thousand km from here. It was
sent to the Motorola agents (1600 km from here :) where the technician
diagnosed a faulty CRT. He also swapped his test CRT in, proving that the
problem is with the CRT, but he's not prepared to part with the CRT he has. Is it more like
TV CRT ot a 'socpe one?
That's what I meant :)
OK, so I have
CRT is marked with the following numbers :
P/N95-P09122T001
P/N96/80396A98
AEG396512
D/14/390GH it could also be D/14/390GHB
(None of these pop up on google).
The size of the CRT is as follows;
L: 360mm
W: 100mm
H: 125mm
A length of 360 yells "oscilloscope" to me... no? I'm thinking that if it's a 'scope tube
almost anything will work?
Actually, no. TV-type CRTs are much more generic than 'cope CRTs. The
latter seem to be different for every device (only semi-joking).
A scheamtic of the unit, or at least the display section, would be a
great help. At least we could see if the CRT has anything really
unconventional about it.
-tony