Description of boards 27
9.4.2) SECONDARY POWER UNIT G 200 TLH (fig. 25)
This unit handles secondary power rectifying.
WARNING!: Before commencing the measurements described, make sure the HF board is disconnected from the bus
board!
Power source / Mode
Test point
Value
OFF
V 1 2
+0.3 Vdc
OFF
V 3 2
+0.3 Vdc
ON / MMA
V out
+52 Vdc
- V 1 2 and V 3 2 must be measured once connector CN1 is discon-
nected from output filter board 15.14.238
REMEMBER TO RECONNECT CN1 ONCE YOU HAVE TAKEN THE MEASURE-
MENT!
- Vout = power source's open circuit voltage OCV
Unless otherwise specified, all measurements sholud be taken with the boards in their slots and connected accordingly
WARNING!
1) Components sensitive to electrostatic discharges.
2) Torque wrench settings:
FASTENING ON HEAT SINK = MAX 1.5 Nx m / 13 lb x in
BOARD FASTENING
= MAX 1.5 Nx m / 13 lb x in
3) Use layer of thermal grease
