D IN THE OPERATING
INSTRUCTIONS UNLESS YOU ARE QUALIFIED TO DO
SO. REFER ALL SERVICING TO QUALIFIED SERVICE
PERSONNEL.
WARNING
:
TO PREVENT FIRE OR ELECTRIC SHOCK HAZARD,
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
CAUTION:
TO PREVENT ELECTRIC SHOCK DO NOT USE THIS
(POLARIZED) PLUG WITH AN EXTENSION CORD. RECEPTACLE OR
OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO
PREVENT BLADE EXPOSURE.
Maintenance Manual LBI-38893
TABLE OF CONTENTS
SPECIFICATIONS* .................................................................................................................................................. 3
GENERAL ............................................................................................................................................................ 3
ELECTRICAL....................................................................................................................................................... 3
IMPORTANT SAFETY INFORMATION ................................................................................................................. 4
DESCRIPTION.......................................................................................................................................................... 6
CIRCUIT ANALYSIS ............................................................................................................................................... 6
LINE FILTER BOARD.......................................................................................................................................... 6
POWER SUPPLY BOARD.................................................................................................................................... 6
AC Input, Rectifier, And Input Filter Capacitors ................................................................................................. 6
Turn-On Surge Protection Relay Control And VCC Source ................................................................................. 6
SWITCHING REGULATOR CIRCUIT................................................................................................................. 6
SHUTDOWN CIRCUITS ...................................................................................................................................... 7
TROUBLESHOOTING.............................................................................................................................................. 8
INITIAL CHECKS ................................................................................................................................................ 8
SYMPTOM/CAUSE TROUBLESHOOTING STEPS ............................................................................................ 8
Fuse F2 Blows Again After Replacement............................................................................................................. 8
Turn-On Surge Protection Relay Does Not Energize............................................................................................ 9
Poor Output Regulation Or No DC Output .......................................................................................................... 9
Shutdown Circuit Problem ................................................................................................................................ 10
THERMAL SHUTDOWN AFTER EXTENDED OPERATION........................................................................... 11
PARTS LIST ........................................................................................................................................................... 12
OUTLINE DIAGRAMS:
LINE FILTER BOARD........................................................................................................................................ 15
POWER SUPPLY BOARD.................................................................................................................................. 16
SCHEMATIC DIAGRAMS:
LINE FILTER BOARD........................................................................................................................................ 17
POWER SUPPLY BOARD.................................................................................................................................. 18
Figures
Figure 1 - 30 Amp Power Supply Block Diagram....................................................................................................... 5
Figure 2 - 30 Amp Power Supply Interconnection Diagram...................................................................................... 11
Copyright © September 1993, Ericsson GE Mobile Communications Inc.
2 LBI-38893
SPECIFICATIONS*
GENERAL
Size (H x W x D)
115 x 121 x 270 mm (2.92 x 3.07 x 6.86 inches)
Weight
2693 grams (95.0 ounces)
Operating Temperature Range
-40
°
C to +60
°
C
Cooling
free air convection (no fan)
ELECTRICAL
Input Voltage Ranges
Low Range (120 Vac nominal)
90 - 135 Vac
High Range (240 Vac nominal)
180 - 270 Vac
Input Voltage Range
selectable with internal jumper
Input Current
7A maximum at 100 Vac
4A maximum at 200 Vac
Input Power Fuse
10A time delay
Input AC Frequency
50 - 65 Hz
Output Voltage
13.8 Vdc
Output Voltage Stability
better than ±1%
Output Voltage Adjustable Range
±5% with internal potentiometer
Output Current Capability
Continuous
15 A
Intermittent
30 A
Output Current Duty Cycle at 30 A
20% (one minute on, four minutes off or five minutes on, fifteen
minutes off)
WARNING
This unit contains dangerous voltage levels. It is strongly recommended that defective units be returned to the
manufacturer for repairs.
If field repair is necessary, remove the input power and then use a load resistor to manually discharge each capacitor
before servicing.
3 LBI-38893
IMPORTANT SAFETY
INFORMATION
c.
That the wire size is large enough for the AC
ampere rating of unit.
10. DO NOT operate unit with a damaged cord or plug -
replace them immediately.
1.
SAVE THIS MANUAL
·- It contains important safety
and operating instructions.
11. Do not operate unit if it has received a sharp blow,
been dropped, or otherwise damaged in any way.
Return to a qualified service shop.
2.
Before using the product, please follow and adhere to
all warnings, safety and operating
instructions
located on the product and in this manual.
12. Do not disassemble unit. Return to a qualified service
shop when service or repair is required. Incorrect
reassembly may result in a risk of electrical shock or
fire.
3.
Do not use auxiliary equipment not recommended or
sold by the manufacturer. To do so may result in a
risk of fire, electrical shock or injury to personnel.
4.
DO NOT expose product to rain, snow or other type of
moisture.
13. DO NOT operate this product in an explosive
atmosphere unless it has been specifically certified
for such operation.
5.
Care should be taken so objects do not fall or liquids
do not spill into the product.
14. To reduce risk of electric shock, unplug unit from
outlet before attempting any maintenance or
cleaning.
6.
DO NOT expose product to extreme temperatures.
7.
To reduce risk of damage to electrical cord, pull by
plug rather than cord when disconnecting unit.
15. DO NOT operate this product with covers or panels
removed. This unit does not contain any user
serviceable components.
8.
Make sure the cord is located so it will not be stepped
on, tripped over or otherwise subjected to damage or
stress.
16. Use only fuses of the correct type, voltage rating and
current rating as specified in the parts list. Failure to
do so can result in fire hazard.
9.
An extension cord should not be used unless
absolutely necessary. Use of an improper extension
cord could result in a risk of fire and electric shock.
If an extension cord must be used, make sure:
17. GROUNDING AND AC POWER CORD
CONNECTION
- To reduce risk of electrical shock
use only a properly grounded outlet. The unit is
equipped with an electric cord having an equipment -
grounding conductor and a grounding plug. Be sure
the outlet is properly installed and grounded in
accordance with all local codes and ordinances.
a.
That pins on the plug of the extension cord are
the same number, size and shape as those of the
plug on the power supply.
b.
That the extension cord is properly wired in
good condition, and
18. DANGER - Never alter the AC cord or plug. Plug
into an outlet properly wired by a qualified electrician.
Improper connection or loss of ground connection can
result in risk of an electrical shock
4 LBI-38893
Figure 1 - 30 Amp Power Supply Block Diagram
5 LBI-38893
DESCRIPTION
NOTE
If the supply is configured for a 120 Vac nominal
input, terminals TB5 and TB7 are jumpered. If it is
configured for a 240 Vac nominal input, terminals TB7
and TB8 are jumpered.
Power Supply 19B801020P4 is a 13.8-Volt 30-ampere
power supply used in the Ericsson GE desk-top stations. It
features pulse-width modulated switching regulator
technology and MOSFET (Metal-Oxide Semiconductor
Field Effect Transistor) driver transistors to produce a
compact and efficient design. Application of the
MOSFET drivers eliminates the need for large external
heat sinks that are normally required with high-current
regulated DC power supplies. The supply can be
configured for a nominal AC input voltage of 120 Vac or
240 Vac. Voltage selection is accomplished with an
internal jumper located on the Power Supply Board. See
the Block Diagram in Figure 1.
Turn-On Surge Protection Relay Control And
VCC Source
Transformer T1, transistors Q1, Q3, and associated
components form an aux converter circuit