Panasonic AG520VDH - COMB. DVD/VCR/TV, Service Manual

Page: 17 / 100

5.1.15. HOW TO SET TRACKING TO THE
NEUTRAL POSITION
Ejecting the cassette tape and then reinserting it will reset the
tracking to the Neutral position.
5.1.16. BLACK SCREWS ON THE
CHASSIS
Black Screws are used on the Mechanism Chassis to identify
screws that require adjustment.
5.1.17. HOW TO RESET ALL
COMBINATION DVD VCR MEMORY
FUNCTIONS
To reset (clear) the select language, channel auto set and set
clock functions to their initial power on condition (power on, no
cassette inserted), hold down the PLAY and FF buttons of VCR
operation panel on the unit together for more than 5 seconds.
Power will shut off.
5.1.18. 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.
5.1.19. VARIABLE VOLTAGE ISOLATION
TRANSFORMER
An Isolation Transformer should always be used during the
servicing of Combination DVD VCR 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 DVD VCR 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.
5.1.20. 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.
17
AG-520VDH