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Black and White Observation system
VM6
Service
Service
OP04
98.05
Service
NORTH-AMERICAN MODELS:
Service Manual: 8109 Sup. 2
Herewith a possible symptom is given with its solution which can take place :
=» Due to tolerances of components it can occur - in some cases - that the system power supply will not start-up or will start-up after
about 2 to 10 minutes, regardless the amount of camera's that is attached to the system. It mostly will occur at low mains voltages.
When the control IC (7110) of the SOPS draws almost 1mA of input current at pin 7 the threshold of about 17V5 will not be
reached and the power supply will not start-up.
The solution for this problem is to exchange D6121 (20 volt Zener) with a Zener diode of 24 volt (4822 130 34398).
Remark : \t is advised to exchange the Zener diode precautionary when the monitor comes for a repair at the repair centre.
=» In the Service Manual of the VM6 family with code number 4822 727 21404 there are on page 25 (Spare Parts list) two different
types of transistors mentioned for 7130. It is adviced to use for 7130 the MTP3N60 type with code number 4822 130 10166.
Published by EvO
9866 VCM Service Department
Printed in The Netherlands
Copyright reserved
Subject to modification
4822 727 21413
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See
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EE fet CNA
PCS 97 100 GB
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