Instruction manual
2
Power Supply 012-01568C
Maintenance
There is no routine maintenance required for the ES-
9049A Power Supply. However, power line surges can
blow the protective fuse without damaging the instru-
ment. Therefore, should the instrument fail to operate and
the fuse is blown, replace it with a new fuse of the appro-
priate value. If the instrument subsequently works prop-
erly, no further action is necessary. If the fuse blows
again (it may take 15 seconds), refer to the ‘Repairs’ sec-
tion in this manual.
Repairs
Should the ES-9049A Power Supply require repair, it is
strongly recommended that the unit be returned to
PASCO scientific. Because PASCO is thoroughly famil-
iar with the instrument and maintains a complete stock of
replacement parts, repairs can be made quickly and at low
cost.
If field repair is desired, a schematic and parts list are in-
cluded in the following section. A brief list of malfunc-
tions and their probable causes are also given.
Troubleshooting Tips
➀
No output on any range:
Fuse blown
➁
Low output on 1000 VDC range:
Defective capacitor C2, C3, C4, or C5.
➂
N
o output on 30 VDC range but other range is all right:
Defective zener diode CR5 or power transistor Q1.
➃
Proper output, but no meter readings:
Defective meter M1.
Limited Warranty
PASCO scientific warrants this product to be free from
defects in materials and workmanship for a period of one
year from the date of shipment to the customer. PASCO
will repair or replace, at its option, any part of the product
which is deemed to be defective in material or workman-
ship. This warranty does not cover damage to the product
caused by abuse or improper use. Determination of
whether a product failure is the result of a manufacturing
defect or improper use by the customer shall be made
solely by PASCO scientific. Responsibility for the return
of equipment for warranty repair belongs to the customer.
Equipment must be properly packed to prevent damage
and shipped postage or freight prepaid. (Damage caused
by improper packing of the equipment for return ship-
ment will not be covered by the warranty.) Shipping
costs for returning the equipment, after repair, will be
paid by PASCO scientific.
Equipment Return
Should this product have to be returned to PASCO scien-
tific, for whatever reason, notify PASCO scientific by
letter or phone BEFORE returning the product. Upon
notification, the return authorization and shipping instruc-
tions will be promptly issued.
➤NOTE: NO EQUIPMENT WILL BE
ACCEPTED FOR RETURN WITHOUT AN
AUTHORIZATION.
When returning equipment for repair, the units must be
packed properly. Carriers will not accept responsibility
for damage caused by improper packing.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION:
TO PREVENT THE RISK OF ELECTRIC SHOCK, DO
NOT REMOVE COVER ON UNIT. NO USER SERVICE-
ABLE PARTS INSIDE. REFER SERVICING TO QUALI-
FIED SERVICE PERSONNEL.
The lightning flash with arrowhead, within
an equilateral triangle, is intended to alert
the user of the presence of uninsulated
“dangerous voltage” within the product’s
enclosure that may be of sufficient magni-
tude to constitute a risk of electric shock to
persons.
The exclamation point within an equi-
lateral triangle is intended to alert the
user of the presence of important oper-
ating and maintenance (servicing) in-
structions in the literature accompany-
ing the appliance.