Compaq CRT Monitor s7500 Service Guide - Page 5

Servicing Precautions, 3 Hi-Pot Test - user manual

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HP S7500/MV7500/CV7500 1-1-3 Product Safety Notices Many electrical and mechanical parts in this chassis have special safety-related characteristics which are often not evident from visual inspection, the protection afforded by them may not be obtained by replacing them with components rated for higher voltage, wattage, etc. Before replacing any of these components, consult the Recommended Spare Parts List given at the end of this manual. Any of the replacements that do not provide the same safety characteristics may result in shock, fire, X-ray emission or other hazards. 1-2 Servicing Precautions Warning: An electrolytic capacitor installed with the wrongpolarity might explode. Caution: Beforeperforming servicingcovered by thisservice manual, readand followthe SafetyPrecautions section ofthis manual. Note: If unforeseen conflict between the following servicing precautions and any of the safety precautions, always follow the safety precautions 1. Follow closely the servicing precautions printed on the monitor cabinet and chassis. 2. Alwaysunplug theAC powercord fromthe AC power source before removingor installingany component or assembly, disconnecting PCB plugs or connectors and connecting a test component in parallel with a capacitor. 3. When replacing parts or circuit boards, clamp the lead wires around the component before soldering. 4. When replacing a high wattage resistor (>0.5W metal oxide film resistor) in the circuit board, keep the resistor about 1 cm (1/2 inch) away from the circuit board. 5. Keep wires away from the high voltage or high temperature components. 6. Keep wires in their original positions so as to minimize interference. 7. Always connect a test instrument's ground lead to the instrument chassis ground before connecting the positive lead;always remove the instrument'sground lead last. After putting the rear cover back and make sure the monitor is working properly, the Hi-Pot & Ground Continuity tests MUST BE performed before the monitor is returned to user. 1-3 Hi-Pot Test 1. TestEquipment Puncturetest model PM5530 ADTorKIKUSU TOS-8750voltagetester orequivalent approvedequipment. Note : The test equipment must be calibrated in regular period. 2. Test Setup a) Apply voltage : DC 2100 VDC b) Test duration : 3 seconds c) Cutoff current should be set to 3 mA 3. Test Procedure a) Unplug power cord from AC source. b) Put the power switch of the monitor in the "ON" position. c) Leave signalcable un-connected. Page 3

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Page 3
HP S7500/MV7500/CV7500
1-1-3 Product Safety Notices
Many electrical and mechanical parts in this chassis have special safety-related characteristics which are
often not evident from visual inspection, the protection afforded by them may not be obtained by replacing
them with components rated for higher voltage, wattage, etc. Before replacing any of these components,
consult the Recommended Spare Parts List given at the end of this manual. Any of the replacements that do
not provide the same safety characteristics may result in shock, fire, X-ray emission or other hazards.
1-2
Servicing Precautions
Warning:
An electrolytic capacitor installed with the wrong polarity might explode.
Caution:
Before performing servicing covered by this service manual, read and follow the Safety Precautions
section of this manual.
Note:
If unforeseen conflict between the following servicing precautions and any of the safety
precautions, always follow the safety precautions
1.
Follow closely the servicing precautions printed on the monitor cabinet and chassis.
2.
Always unplug the AC power cord from the AC power source before removing or installing any component
or assembly, disconnecting PCB plugs or connectors and connecting a test component in parallel with a
capacitor.
3.
When replacing parts or circuit boards, clamp the lead wires around the component before soldering.
4.
When replacing a high wattage resistor (>0.5W metal oxide film resistor) in the circuit board, keep the
resistor about 1 cm (1/2 inch) away from the circuit board.
5.
Keep wires away from the high voltage or high temperature components.
6.
Keep wires in their original positions so as to minimize interference.
7.
Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the
positive lead; always remove the instrument’s ground lead last.
After putting the rear cover back and make sure the monitor is working properly, the Hi-Pot &
Ground Continuity tests
MUST BE
performed before the monitor is returned to user.
1-3 Hi-Pot Test
1.
Test Equipment
Puncture test model PM5530 ADT or KIKUSU TOS-8750 voltage tester or equivalent approved equipment.
Note : The test equipment must be calibrated in regular period.
2.
Test Setup
a)
Apply voltage : DC 2100 VDC
b)
Test duration : 3 seconds
c)
Cutoff current should be set to 3 mA
3.
Test Procedure
a)
Unplug power cord from AC source.
b)
Put the power switch of the monitor in the “ON” position.
c)
Leave signal cable un-connected.