ViewSonic P90F Service Manual page 6

1.8
Voltage Breakdown Test
Connent the live and neutral connections together. Switch the monitor on/off switch to on Apply
1500VAC RMS or 2250VDC, 50Hz for one minute between live and neutral shorted together and
earth. Ensure no voltage breakdown occurs.
1.9
Earth Resistance/Continuity Test
Measure the resistance between the signal cable metal shell and the earth pin in the A.C. socket.
At a current of 25 amperes the resistance should be less than 100m.
NOTE:A portable appliance tester (PAT) is a suitable instrument to use for the above safety tests.
1.10
H.V. Over Voltage Portection (Required for X-Radiation Safety)
Adjust R176 slowly anti-clockwise until the over voltage protection circuit is activated, and the high
voltage must be less than 33KV at this moment. After test, R176 should be adjusted back to
normal(=26.2KV)
CAPACITOR:
C850 400V
C851 400V
C135 250V
C139 100V
RESISTOR
R827
SEMICONDUCTORS
I101, I803 UC3842N
I301 (RA) TDA9116 SDIP32
I301 (RB) TDA9113 SDTP-32
I310 TDA8172 7P
IA01 NT68F62U
Q801 2SK2648-01
Q433 2SC5587AS
Q121 2SK2843
D807 RD20EB2-T1
D827 HZ5C1
OTHERS
SR801 OSA-SS-212DM5
F801 250V/3.15A
T801 TPW-697
T101 TFB-280L
V901 (CA) M46QDG423X04
ViewSonic Corporation
4700PFM CAPACITOR.CERAMIC
4700PFM CAPACITOR.CERAMIC
33UFM CAPACITOR.ELECTROLYTIC 5214433012
330UFM CAPACITOR.ELECTROLYTIC 5214019612
1K RESISTOR.VS
IC LINEAR
IC.LINEAR A.S.D.C.
IC.LINEAR A.S.D.C.
IC.LINEAR
IC.LSI MCU FLASH MTP
TR FET MOS
TR NPN HF
TR FET MOS
TR PNP HF.
DIODE ZENER
RELAY
FUSE
POWER TRANSFORMER
TRAQNS.FLYBACK COLOR
CCRT/DY
2
5230105501
5230105501
5162161020
6644063111
6644076308
6644076305
6644076000
6647008204
6626003208
6621040405
6626003203
6615011831
6615007834
5054613402
5054431539
5061369700
5062628032
5051286325
Confidential – Do Not Copy
P90f-1