ViewSonic P95f+-1 Service Manual page 5

1-3 SERVICE NOTES
1. When replacing parts or circuit boards, clamp the lead wires around terminals before soldering.
2. When replacing a high wattage resistor (more than 1/2W of metal oxide film resistor) in circuit
board, keep the resistor about 10mm (1/2 in) away from circuit board.
3. Keep wires away from high voltage or high temperature components.
4. Keep wires in their original position so as to reduce interference.
1-4 HIGH VOLTAGE WARNING
Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard.
Work on this model should only be performed by those who are thoroughly familiar with
precautions necessary when working on high voltage equipment.
Exercise care when servicing this chassis with power applied. Many B plus and high voltage
terminals are exposed which, if carelessly contacted, can cause serious shock or result in
damage to the chassis. Maintain interconnecting ground lead connections between chassis and
picture tube dag when operating chassis.
Certain HV failures can increase X-ray radiation. Monitor should not be operated with HV levels
exceeding the specified rating for the chassis type. The maximum operating HV specified for the
chassis used in this monitor is
25.0KV ± 0.3KV
with a line voltage of 100/240 VAC. Higher voltage may also increase possibility of failure in HV
supply.
It is important to maintain specified values of all components in the horizontal and high voltage
circuits and anywhere else in the monitor that could cause a rise in high voltage or operating
supply voltages. No changes should be made to the original design of the monitor. Components
shown in the shaded areas on the schematic should be replaced with exact factory replacement
parts. The use of unauthorized substitute parts may create a shock, fire or other hazard.
To determine the presence of high voltage, use an accurate, high impedance, HV meter
connected between second anode lead and CRT dag grounding device. When servicing the High
Voltage System, remove static charge from it by connecting a 10K ohm resistor in series with an
insulated wire (such as a test probe) between picture tube dag and 2nd anode lead.(AC line cord
disconnected from AC power outlet.)
The picture tube used in this monitor employs integral implosion protection. Replace with tube of
the same type number for continue safety. Do not lift picture tube by the neck. Handle the picture
tube only after discharging the high voltage completely.
ViewSonic Corporation
2
Confidential – Do Not Copy
P95f+/B-1