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6-4
6.2.6.
Replacing the cathode ray tube (CRT)
WARNING:
Handle the CRT carefully. Rough handling or scratching can cause the CRT to implode.
In particular be very careful with the side connections of the CRT. If these pins are bent the CRT
is likely to develop a loss of vacuum.
- Remove the five side connections from the CRT.
- Unscrew the bracelet that secures the CRT in i t s rubber socket.
- Unplug the EHT-cable from the CRT.
WARNING:
The EHT-cable is unbreakely connected to the EHT multiplier unit. The cable can be
disconnected from the CRT. When the EHT-cable i s disconnected from the CRT the end of the
cable must be discharged immediately by shorting
-
Unplug the trace rotation cable from the X/Z final amplifier unit (3-pole connector).
- Remove the top support of the CRT screen that carries the graticule illumination lamps.
- Remove the screen bezel and contrast filter as indicated in section 5.3. of the operating manual.
Remove the CRT socket.
-
-
Carefully pull the CRT from the instrument through the front profiie.
- After removing the two star screws that secure the rubber CRT support to the rear panel, remove the CRT shield.
IMPORTANT:
When remounting the CRT shield, the rubber CRT support or the CRT itself follow the
procedure in reversed sequence and take care that the CRT i s pushed properly against the
contrast filter in the front profile before fixing the bracelet.
Components:
R3
R4
R5 and R6
27 K
R7
1 K8
R8 and R9
3 K3
1 K5
Fig. 6.2a. Dummy load
4w
4w
4w
WR0617
CR68
4w
4w
4w
7w
for
power supply.
to the instruments earth.
it
- 7 Y
- l o o v
ONLY FOR
4822 1 12 21 074
4822 1 12 21 061
4822 1 12 21 056
4822 110 23145
4822 11221114
4822 11221121
4822 11221112
4822 11241103
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