Panasonic PV-20DF25-K, Service Manual

Page: 14 / 87

5.1.10. HOW TO RESET ALL
COMBINATION TV/DVD MEMORY
FUNCTIONS
To reset (clear) the select language, channel auto set and set
clock functions to their initial power on condition, hold down the
PLAY and SKIP- buttons of operation panel on the unit together
for more than 5 seconds.
Power will shut off.
5.1.11. HOW TO CONFIRM AUTO CLOCK
SET FEATURE
1. Connect an RF cable from the output of one unit to the input
of the test unit.
2. Select corresponding RF channels.
3. Playback a recording of P.B.S. channel including clock set
data and confirm this feature.
5.1.12. VARIABLE VOLTAGE ISOLATION
TRANSFORMER
An Isolation Transformer should always be used during the
servicing of Combination TV/DVD whose chassis is not isolated
from the AC power line. Use a transformer of adequate power
rating as this protects the technician from accidents resulting in
personal injury from electrical shocks. It will also protect
Combination TV/DVD from being damaged by accidental
shorting that may occur during servicing.
Also, when troubleshooting the above type of Power Supply
Circuit, a variable isolation transformer is required in order to
increase the input voltage slowly.
5.1.13. SPECIAL NOTE
All integrated circuits and many other semiconductor devices
are electrostatically sensitive and therefore require the special
handling
techniques described under the
"ELECTROSTATICALLY SENSITIVE (ES) DEVICES" section
of this service manual.
5.1.14. MODEL NO. IDENTIFICATION
MARK
Use Marks shown in the chart below to distinguish the different
models included in this Service Manual.
14
PV-20DF25 / PV-27DF25 / PV-27DF5 / PV-20DF25-K / PV-27DF25- K