PDi PDI-772HE User manual

PDI-772HE
10 Tap AC Hospital-grade
Central Power Supply
Document Number:PD196-038R2

Better Solutions Are Within ReachTM
MODEL NUMBER: PDI-772HE
Document Number:
PD196-038R2
10 Tap AC Central Power Supply
Page 1 of 4
PDi Communication Systems, Inc. 40 Greenwood Lane Springboro, Ohio 45066 USA PH 1-800-628-9870 FX 937-743-5664
Graphical Symbols
This lightning flash with arrowhead symbol, within an equilateral is intended to alert the user of
the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user of the
presence of important operating and maintenance (servicing) instructions in the literature
accompanying the appliance.
This service manual contains various CAUTIONS and WARNINGS indicated by triangular warning
symbols, which should be read and understood in order to minimize the risk of personal injury to service
personnel and customers. The possibility exits that improper service methods may damage the
equipment or result in property damage or user injury. It also is important to understand that these
CAUTIONS and WARNINGS are not exhaustive. PDI could not possibly know, evaluate and advise the
service industry of all conceivable methods in which service might be done or of the possible hazardous
consequences
of each method. Accordingly, a servicer who uses a service procedure or tool which is not recommended
by PDI must first satisfy themselves thoroughly that neither their safety nor the safe operation of the
equipment will be compromised by the service method selected.
Product Safety Servicing Precautions
1. MODIFICATIONS Do not attempt to modify this product in any way without written authorization from
PDI. Unauthorized modifications will not only void the warranty, but may lead to your being liable for
any resulting property damage or user injury.
2. POWER This unit supplies a NEC Class 2 level power voltage suitable to power a CSA Certified / UL
Approved Hospital Grade Television. This supply provides an AC output voltage only and is not
suitable for DC powered televisions.
3. REPAIRS Due to the specialized nature of this power supply, field servicing is not recommended.
The power supply must be removed and returned to the manufacturer for servicing.
Input
Voltage
Current
115
VAC
10 Amps
Maximum
Output
Voltage
Current
28 VAC
3 Amps
Maximum

Better Solutions Are Within ReachTM
MODEL NUMBER: PDI-772HE
Document Number:
PD196-038R2
10 Tap AC Central Power Supply
Page 2 of 4
PDi Communication Systems, Inc. 40 Greenwood Lane Springboro, Ohio 45066 USA PH 1-800-628-9870 FX 937-743-5664
CAUTION 28
VAC is present
on the coax cable
during this
measurement.
Field Troubleshooting
Troubleshooting involves determining the fault and then taking corrective
action. The fault is either external to the supply or a fault inside the supply.
If the fault is internal (inside) the supply, remove from service and replace
with a know good working central power supply.
FAULT
CORRECTIVE ACTION
All TVs are dead.
1. Verify AC line voltage to the supply.
2. Power supply main circuit breaker tripped.
Reset. NOTE: A tripped main breaker indicates
an overload condition and may require removing
the power supply from service for further bench
troubleshooting.
3. Verify AC output voltage (28 VAC) at each “F”
output fitting at the central power supply. If an
“F” output fitting is dead. Reset the
corresponding output circuit breaker if tripped. If
resetting the output circuit breaker does not clear
the fault, remove the central power supply from
service. An internal fault has occurred that
requires bench repair.
Individual TV
dead.
1. At the TV, open the cover on the support arm.
Slide the rubber boot and expose the “F” barrel
connection. Disconnect the “arm side” coax and
verify AC voltage present on the supply side of
the coax. If AC power supply voltage (28 VAC)
is present, a fault has occurred in the TV.
Replace the TV.
2. At the central, check the corresponding output
circuit breaker. If tripped, reset the output circuit
breaker. NOTE: A tripped output circuit breaker
may indicate either a TV or coax cable fault.
Main circuit
breaker will not
reset.
1. Remove from service and replace with a know
good working central power supply.
Output circuit
breaker will not
reset.
1. Disconnect the coax cable from the suspect ”F”
output connector. Reset the output circuit
breaker. If the circuit breaker holds, a coax
wiring or TV fault has occurred.
2. With the coax cable disconnected, reset the
output circuit breaker. If the circuit breaker trips
an internal fault has occurred that requires bench
repair. Remove from service and replace with a
know good working central power supply.

Better Solutions Are Within ReachTM
MODEL NUMBER: PDI-772HE
Document Number:
PD196-038R2
10 Tap AC Central Power Supply
Page 3 of 4
PDi Communication Systems, Inc. 40 Greenwood Lane Springboro, Ohio 45066 USA PH 1-800-628-9870 FX 937-743-5664
FAULT
CORRECTIVE ACTION
TV picture noisy
on all TVs.
1. At the central power supply, remove the
input RF cable and check the signal level.
The central power supply requires a
minimum RF level of +20 dbmv for a
healthy RF signal level at each TV.
2. At the central power supply, remove the
output coax and check the signal level at
each “F” output. With a know RF input
signal level to the central power supply “RF
IN”, check for an insertion loss of 14 dbmv
at each “F” output. Any insertion loss
greater than 14 dbmv indicates a fault.
Remove from service and replace with a
know good working central power supply.
TV picture noisy
on one TV.
1. At the TV, open the cover on the support
arm. Slide the rubber boot and expose the
“F” barrel connection. Disconnect the “arm
side” coax and verify an RF signal level
equal to or greater than 0 dbmv. Caution
AC voltage is present on the coax during
this measurement. If the signal level is less
than specified check for coax wiring faults.
2. If the signal level is greater than 0 dbmv,
replace the “F-61” barrel connector and
check the TV’s picture.
3. If the TV’s picture is noisy, replace the TV.

Better Solutions Are Within ReachTM
MODEL NUMBER: PDI-772HE
Document Number:
PD196-038R2
10 Tap AC Central Power Supply
Page 4 of 4
PDi Communication Systems, Inc. 40 Greenwood Lane Springboro, Ohio 45066 USA PH 1-800-628-9870 FX 937-743-5664
All non-warranty
repairs require a
purchase order.
All returned items
must be insured.
Field Replacement
The PDI-772HE is a specialized, high-efficiency power supply that
incorporates very high bandwidth RF circuitry. Unique to the design, a
diplexed RF circuit that provides RF CATV signal and 28 VAC power to
10 discrete outputs rather than the 8 binary style outputs found
commonly in passive RF distribution networks.
Due to the specialized nature of this power supply, in-field servicing is
not recommended. The power supply must be removed and returned to
the manufacturer for servicing.
REMOVAL
1. Disconnect the AC line cord.
2. Remove four screws from the access cover.
3. Disconnect all RF output coax cables. Close access cover and
secure with screws.
4. Loosen and remove the four power supply mounting bolts.
5. Remove the supply.
REPLACEMENT
1. Position the supply over the mounting holes. Install and tighten
the four mounting bolts.
2. Remove four screws from the access cover. Connect the
output coax cables.
3. Connect the RF input coax cable.
4. Close access cover and secure with screws.
5. Connect the AC line cord to power the supply.
Factory Service
To obtain factory service for the central power supply:
1. Call 1-800-628-9870 X223 and request a “Return Authorization”
form. The form is faxed or emailed immediately.
2. All form information must be completed in order to be assigned
a Return Authorization number.
3. Fax the completed “Return Authorization “ form to
513-743-5664.
4. Package the supply in its original shipping box. All returned
items must be insured. Please include a copy of the “Return
Authorization” form with all shipments and reference the RA#
on the shipping label or box.