Sony tc wr 701 es service manual

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features;

For higher quality recording/playback

- The Dolby HX PRO system which improves the linearity ol the
tapes high-range response during recording.

- B, C and 3 type Dolby NR systems which reduce tape noise.

- Automatic calibration on each deck which ensures optimum
recording conditions to bring out the best in every tape.

For your convenience

- Automatic tape type detection during playback and recording.

- The Multi-AMS and Memory Play tunctions which provide easy
access to a desired selection.

- A relay function lor long recording and playback.

~ Auto play function which automatically starts playback alter tape
rewinding to start.

~ Synchronized dubbing at normal or high speed

~ Simultaneous Recording tunction tor the simultaneous recording
oi the same source to cassettes in both decks.

For easier operation

0 Twin easy-to-read linear counters which show the elapsed
recording or playing time on each deck.

- An optional remote commander which allows the remote control
of various operations.

' Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories Licensing
Corporation. HX Pro originated by Bang & Olutsen.

"DOLBY", the double-D symbol DU and HX PRO are trademarks
ol Dolby Laboratories Licensing Corporation.

MODEL IDENTIFICATION
(Specification Label)

TC»WR701ES
TC-WR7353

SONY MODEL no. 22 m,

STEREO CASSETTE DECK

V/////////////////////////A

US, Canadian model: AC 120V 60Hz 33W
AEP, German model : AC 220-230V~50/60Hz 33W
Australian model : AC 240V~50l60Hz

SAFETY CHECK-OUT (US Model)

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 0.5 rnA (500 microampers). Leakage
current can be measured by any one of three
methods.

1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers instructions to use these instru-
merits.

to

A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.

3. Measming the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The limit" indication is 0.75 V, 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
Paris on Set

AC
0.15uF glint voltmeter
(0.75 V}

5' Earth Ground

F ig. A. Using an AC voltmeter to check AC leakage.