Sony TC-RX55 - Safety and Front Panel; Safety Check-out and Leakage Testing; Front Panel Controls and Indicators

SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety check before releasing
the set to the customer:
Check the antenna terminals, metal trim, ‘“‘metallized”’
knobs, screws, and all other exposed metal parts for
AC leakage. Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these instru-
ments.
i)
A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The “limit” indication is 0.75V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
To Exposed Metal
Parts on Set
AC
voltmeter
{0.75 V)
= Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SECTION 1
GENERAL
IDENTIFICATION OF FRONT PANEL PARTS
& (eject) button
| 2 | DIRECTION indicators
Tape operation buttons
44 (leftward fast winding) button
PP (rightward fast winding) button
® (forward play) button
“@ (reverse play) button
m@ (stop) button
il (pause) button
© REC MUTE (record muting) button
@ REC (record) button
|4
|
Tape
transport
mode
indicators
(REC,
PAUSE)
5 | MICROPHONE jacks (phone jacks)
| 6 | HEADPHONES jack (stereo phone jack)
REC LEVEL (recording level) controls
|8 | DOLBY NR switches
9 DIRECTION MODE selector (TC-RX410)
MPX
FILTER
switch
(TC-RX55/RX55ES)
Remote control sensor
You can remotely control this cassette deck with:
—A remote commander that has an mark
and comes with a Sony amplifier or receiver
and which can be used to control a cassette
deck.
—-An optional Sony remote commander that has
an mark.
DIRECTION MODE selector (TC-RX55/R X55ES)
PEAK LEVEL METER and DIGITAL COUNTER
(TC-RX55/R X55ES)
13] TAPE TYPE indicators (TC-RX55/R X55ES)
COUNTER RESET and MEMORY buttons
(TC-RX55/R X55ES)
[15] Cassette holder
POWER switch
TIMER switch (TC-RX55/RX55ES)