How To Find A Good Earth Ground; Handling The Flexible Flat Cable (Ffc) - Sony RB1G Service Manual

Safety Notes

1-5. How to Find a Good Earth Ground

1) A cold-water pipe is a guaranteed earth ground; the cover-plate retaining
screw on most AC outlet boxes is also at earth ground.
2) If the retaining screw is to be used as your earth ground, verify that it is at
ground by measuring the resistance between it and a cold-water pipe with an
ohmmeter. The reading should be zero ohms.
3) If a cold-water pipe is not accessible, connect a 60- to 100-watt trouble-
light (not a neon lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate the hot side on the line;
the lamp should light at normal brilliance if the screw is at ground potential
(see Figure 3).
Figure 3. Checking for earth ground.
1-6. Lead Free Information
The circuit boards used in these models have been processed using Lead
Free Solder. The boards are identified by the LF logo located close to the
board designation.
Figure 4: LF Logo
The servicing of these boards requires special precautions. It is strongly
recommended to use Lead Free Solder material in order to guarantee optimal
quality of new solder joints.
Figure 5: LF logo on circuit board

1-7. Handling the FLEXIBLE FLAT CABLE (FFC)

 When you insert / pull out FFC, please grasp a reinforcement board and main body of
FFC.
Please hold reinforcement board and
plunge it to depths.
Main Board
< Insertion>
RB1G CHASSIS
W600A/ W603A/ W605A/ W607A/ W650A/ W651A/ W653A/
W654A/ W655A/ W656A/W657A/ W658A/ W670A/ W674A
Please pull out FFC while pushing the
button of both ends at the same time.
Main Board
<Pull out>
7