ViewSonic A90f+-1 VCDTS23307-2R Service Manual page 5

1.8
Voltage Breakdown Test
Connent the live pin and neutral pin together. Switch the monitor on/off switch to on. Apply 1500VAC
RMS or 2250VDC, 50Hz for one minute between this connection point(live and neutral pin short) 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 500mohm.
NOTE: A portable appliance tester (PAT) is a suitable instrument to use for the above safety tests.
1.10
H.V. Over Voltage Protection (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 just before the activation. After test, R176 should be adjusted back to
normal(=25.9KV)
CAPACITOR:
C850 400V
C851 400V
C135 250V
C139 100V
RESISTOR
R827 1/4w
SEMICONDUCTORS
I803 UC3842N
I301 TDA9116 SDTP-32
I310 TDA8172 7P
I101 UC3842N
IA01 NT68F62U SDIP-42
Q121 2SK2843
Q433 BU4525AX
Q801 2SK2648
D827 HZ5C1
OTHERS
SR801 CSA-SS-212DM5
F801 250V/3.15A
T801 TPW-697
T101 (RA) TFB-280T
T101 (RB) TFB-280L
V901 (RA) M46QCK761X123 (TCO
MDT)
ViewSonic Corporation
4700PFM CAPACITOR.CERAMIC
4700PFM CAPACITOR.CERAMIC
33UFM CAPACITOR.ELECTROLYTIC
330UFM CAPACITOR.ELECTROLYTIC
2K ohm RESISTOR.VR
IC LINEAR
IC.LINEAR A.S.D.C.
IC.LINEAR
IC.LINEAR
IC.LSI MCU
TR FET MOS
TR NPN
TR FET MOS.
DIODE ZENER
RELAY
FUSE
POWER TRANSFORMER
TRAQNS.FLYBACK COLOR
TRAQNS.FLYBACK COLOR
CCRT/DY
2
5230105501
5230105501
5214433012
5214019612
5162161220
6644063111
6644076308
6644076000
6644063111
6647008204
6626003202
6621002801
6626003208
6615007834
5054613402
5054431539
5061369700
5062628031
5062628032
5051286346
Confidential – Do Not Copy
A90f+-1