Circuit Board Diagrams; Main Cba Top View - Hitachi VTFX340EUK Service Manual

5 CIRCUIT BOARD DIAGRAMS

5-1 Main CBA Top View & Sensor CBA Top View
CAUTION !
For continued protection against fire hazard,
replace only with the same type fuse.
NOTE :
The voltage for parts in hot circuit is measured
using hot GND as a common terminal.
WF1
J23
V-OUT
VR501
SW-P
WF2
TP502
RF-SW
CAUTION !
Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F1001) is blown, check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
BECAUSE A HOT CHASSIS GROUND IS PRESENT IN THE POWER
SUPPLY CIRCUIT , AN ISOLATION TRANSFORMER MUST BE USED.
ALSO , IN ORDER TO HAVE THE ABILITY TO INCREASE THE INPUT
SLOWLY , WHEN TROUBLESHOOTING THIS TYPE POWER SUPPLY
CIRCUIT , A VARIABLE ISOLATION TRANSFORMER IS REQUIRED.
Sensor CBA Top View
TP507
S-INH
TP501
CTL
WF3
TP301
C-PB
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