Panasonic SA-XR55E, Service Manual, Page: 52 / 130

(All schematic diagrams may be modified at any time with
the development of new technology)
Note :
S901 Power switch
S902 Speaker A switch
S903 Band switch
S904 Preset switch
S906 Speaker B switch
S907 Tune Down switch
S908 Tune Up switch
S909 Multi Control switch
S910 Enter switch
VR901 Volume
VR902 Input Selector
·
The voltage value and waveforms are the reference voltage
of this unit measured by DC electronic voltmeter (high
impedance) and oscilloscope on the basis of chassis.
Accordingly, there may arise some error in voltage values
and waveforms depending upon the internal impedance of
the tester or the measuring unit.
· Importance safety notice :
Components identified by mark have special
characteristics important for safety. Furthermore, special
parts which have purposes of fire-retardant (resistors), high-
quality sound (capacitors), low-noise (resistors), etc. are
used. When replacing any of components, be sure to use
only manufacturer´s specified parts shown in the parts list.
Caution !
IC, LSI and VLSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care during
repair.
· Cover the parts boxes made of plastics with aluminium foil.
· Put a conductive mat on the work table.
· Ground the soldering iron.
· Do not touch the pins of IC, LSI or VLSI with fingers directly.
12 Notes of Schematic Diagram
52
SA-XR55E / SA-XR55EB / SA-XR55EG