User manual

MULTI-OUTPUT POWER SUPPLY
USER MANUAL
20
6. MAINTENANCE
WARNING
The following instructions are for use by qualified personnel only. To avoid
electrical shock, do no perform any servicing other than the operation instruction of
the manual unless you are qualified to do so.
6-1. Fuse Replacement
If the fuse blows, the CV or CC indicators will not light and the power supply
will not operate. The fuse should not normally open unless a problem has
developed in the unit. Try to determine and correct the cause of the blown fuse,
then replace only with a fuse of the correct rating and type. The fuse is located
on the rear panel (see Fig.4-2 & Table 2-1).
WARNING: For continued fire protection, replace fuse only
with 250V fuse of the specified type and rating, and disconnect
power cord before replacing fuse.
AVERTISS: Pour une protection contre les risques d’incendie,
remplacer le fusible exclusivement par un modèle aux
caractéristiques équivalentes.
6-2. Line Voltage Conversion
The primary winding of the power transformer is tapped to permit operation
from 100, 120, 220, or 230VAC, 50/60Hz line voltage. Conversion from one
line voltage to another is done by change AC selects switch as shown in
Fig. 4-2.
The rear panel identifies the line voltage to which the unit was factory set. To
convert to a different line voltage, perform the following procedure:
(1) Make sure the power cord is unplugged.
(2) Change the AC selects switch to the desired line voltage position.
(3) A change in line voltage may also require a corresponding change of fuse
value. Install the correct fuse value as listed on rear panel.
MULTI-OUTPUT POWER SUPPLY
USER MANUAL
21
6-3. Adjustments
This unit was accurately adjusted at the factory before shipment. Readjustment
is recommended only if repairs have been made in a circuit affecting
adjustment accuracy or if you have a reason to believe the unit is out of
adjustment. The recommended calibration device is a multimeter with an
accuracy of ±0.1% DCV or better (GOOD WILL model GDM-8145 or
equivalent).
If readjustment is required, use the following procedure. The location of the
adjustments is shown in Fig. 6-1.
(1) Independent Adjustment
A. Disengage both Tracking mode switches (both switches out) so that the
power supply is in the independent operating mode.
B. Connect a 4-1/2 digital multimeter with an accuracy of ±0.1% DCV to
measure the DC voltage at the output terminals of the CH1 (CH2)
supply.
C. Set the CH1 (CH2) VOLTAGE control to maximum (fully clockwise).
D. Adjust trimmer potentiometer (VR101 CH1,VR301 CH2) on the circuit
board (located on the right side of the supply) for a reading as close to
rating voltage ×1.05 (on the multimeter) as possible.
E. Set output on by adjusting the trimmer potentiometer (VR801 CH2,
VR201 CH1) from the CH1 (CH2) voltage indicator circuit board
(located on the meter or A/D converter board) for a reading of rate
voltage ×1.05 on the CH1 (CH2).
F. Set output off by adjusting trimmer potentiometer (VR802 CH2, VR202
CH1) from the CH1 (CH2) voltage indicator circuit board (located on
the meter or A/D converter board) for a reading of rate voltage on the
CH1 (CH2)(invalid for GPS-2303)
G. Connect the external multimeter across the CH1 (CH2) SUPPLY output
terminals to read the output current (so that the meter causes a short
circuit across the terminals) and adjust the CH1 (CH2) CURRENT
control so that rating amps is read on the multimeter.
H. Set output on by adjusting the trimmer potentiometer (VR901 CH2,
VR701 CH1) so that the CH1(CH2) meter also reads rating amps.
I. Rotate the CH1(CH2) current control fully clockwise (maximum).
J. Adjust VR103 on the CH1 (VR303 CH2)supply circuit board (located
on the right side of the supply) to obtain an output current of rating amps
×1.05 (read on the meter or LED display).