Panasonic PV-V4525S, Service Manual

Page: 11 / 46

4.11. 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.
4.12. BLACK SCREWS ON THE
CHASSIS
Black Screws are used on the Mechanism Chassis to identify
screws that require adjustment.
4.13. VARIABLE VOLTAGE
ISOLATION TRANSFORMER
An Isolation Transformer should always be used during the
servicing of 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 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.
4.14. 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.
4.15. MODEL NO. IDENTIFICATION
MARK
Use Marks shown in the chart below to distinguish the different
models included in this Service Manual.
Note:
Refer to Item 3 of Schematic Diagram Notes of Schematic
Diagram Notes, for mark “PT.”
11
PV-V4525S / PV-V4535S-K / PV-455S-K