Y-SUSTAIN FLOATING GROUND [FG15V] AND [FG5V] CHECK
TIP: Some Circuit components are on the back of the board. To Test these
voltages, remove the board completely, supply Ground and any 5V supply to M5V
fuse FS201. Ground OE Jumper J393.
Floating
Ground checks must be made from Floating Ground. Use far left hand top 4 screws
of the Y-SUS.
Source FG5V (Floating Ground 5V). D509 cathode.
Source FG15V (Floating Ground 15V). D508 cathode.
Location:
Back Side of Board.
Y-SUSTAIN 18V GENERATION CHECK
Voltage Measurements for the Y-SUS Board
18V Test Point Used in the Y-SUS for Waveform Creation and Leaves the
Y-SUS board on P101 pins 1~3 to the Control Board. Checked at Cathode Side
D506.
Run: 18.24V Standby: 0V Diode Check: 1.14V
Y-SUSTAIN FUSE INFORMATION: There are 3 fuses on this board.
FS201 (M5V) 4V/125V
FS201 Protects M5V
Used for 18V, (D506), FG5V and FG15V Creation (D508 and D509). Also, M5V leaves
the Y-SUS on P101 for the Control board and for the Z-SUS.
Diode Check 1.19V
With Board Disconnected. 0.65V with board connected.
FS202 (VS) 4V/250V; protects [VS]. Diode Check Open With Board Disconnected or Connected.
FS203 (VA) 10A/125V. FS203 Protects VA which leaves the Y-SUS on
P203. Diode Check Open With Board Disconnected or Connected.
