CVM 2037
CVM 2051
ADJUSTMENTS
For authorized personnel only
Test equipment required
Digital voltmeter.
Dual trace oscilloscope.
Video sweep generator (up to 10 MHz).
Video test generator.
EHT voltmeter.
Extension board (order number V5627200).
ADJUSTMENT PROCEDURE
Preliminary
WARNING
Read the Service Safety Precautions
at the front of this manual
before starting the adjustments.
Check for correct mains voltage.
Remove the rear and top covers from the monitor.
1 Switched Mode Power Supply
Insert the Switched Mode Power Supply into the extension board.
Connect a digital voltmeter to pin 2 of connector DIGITAL CON. and adjust P2 for 120 Vdc.
Earth connection of the digital voltmeter is at pin 9,10,11 or 12 of connector ANALOG CON. or
at TP3.
Connect a digital voltmeter to pin 1 of connector DIGITAL CON. and adjust P1 for 5.2 Vdc.
2
Deflection and EHT board
2.1 High Voltage adjustment
Set all presets P1 , P2 , and P3 fully anticlockwise.
Connect an EHT meter to the anode of the CRT.
Adjust P2 (EHT adjust) for 27.5 kV.
Adjust P3 (EHT limit) so that the EHT Hold Down activates.
Adjust again P2 (EHT adjust) for 24.5 kV (nominal EHT).
Seal P3.
2.2 Beam Current Limit adjustment
X RADIATION WARNING
AFTER ANY SERVICE INTERVENTION. THE
CORRECT OPERATION OF THE HOLD DOWN
CIRCUIT MUST BE CHECKED.
SEE ADJUSTMENT PROCEDURE ITEM 2.1
Set the contrast level to maximum.
For CVM2037/51 PIL & CVM37 IH : adjust P1 (Beam Current Limit) for a light output of 200 nit.
For the other versions : adjust P1 for a light output of 170 nit.
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