Service manual

ALIGNMENT AND TEST PROCEDURES
7-23
Month 2000
Part No. 001-2004-601
8. Decrease Vs1 until:
the relay disengages
the LED lights
no voltage is present at the active load.
This voltage will be 19V DC ±0.5V.
9. With the enable line OFF measure current Is, it
should be less than 20 mA.
10.Reverse the polarity of Vs1
Set to 26.5V DC
BBM Enable ON
Reverse Battery LED will light and Is should be less
than 50 mA.
11.Disconnect the test setup.
7.8 BATTERY CHARGER SECTION
1. Connect Battery Backup Module as shown in Figure
7-22.
2. Set the active load to 0A and set Vs2 to 40V at 3A.
3. Adjust R140 so the voltage at the active load reads
27.55V DC ±0.1V.
NOTE: The temperature sensor LM335 has to be at
22°C (room temperature).
4. Increase the active load current to 1.8A and verify
voltage at the load is greater than 26V.
NOTE: The fan control line will stay at 0V until the
heat sink is above 50°C.
5. Set the active load current to zero, shut off Vs2 and
disconnect the BBM. Glyptol R140.
Figure 7-22 BATTERY CHARGER TEST SETUP
LM335
Vs2
0-40V @ 3A
POWER SUPPLY
B+
B-
023-2000-830
BASIC BOARD MODULE
TEMP
FAN CONTROL
ENABLE
ON
OFF
ACTIVE
LOAD
(+)
(-)
V
CHGR
1k