Section 4. Electrical Adjustments - Sony TC-KA6ES Service Manual

SECTION 4
ELECTRICAL ADJUSTMENTS
* Note
1. Perform adjustment in the order listed below. (As a rule,
adjust the record system after adjustment of playback system
has been completed.)
Adjust and measure both channels otherwise specified.
To perform simultaneous record and playback, select
recording mode, and set MONITOR switch to TAPE, then
play back immediately the recorded signal to take out from
LINE OUT.
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* Switch position
DOLBY NE ii sicissassutscapresecetoadianeee tes tetes OFF
MPX FILTER ssvstpcssssnivesceactaceucsvascdesatalyesoeet's OFF
TVET, sedis ttiensiessdien enemies OFF
MONTTOR ssiccstsdiste carstaanetaiicanaedevannaoveevtents TAPE
CALIBRATION 'aicsptesivenscitirecumacans OFF
BISS. coeur ataeavedan CENTER CLICK
REC LEVEL «.:iscivstecegarchesnvenss CENTER CLICK
REC EO ©. cocnsvs cotacaeresectiusease CENTER CLICK
* Standard Record
Adjust the REC LEVEL (RV501) controls so that the I/O
signal levels specified below can be attained.
Record Mode
AF OSC
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Attenuator 10kQ 47ka. |Z]
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6002 VINE IN LINE OUT
OdB=0.775V
Standard Input Level
Signal source impedance 10kQ
Input signal level 0.5V (-3.8dB)
Standard Output Level
Load impedance 47kQ
output signal level 0.5V (-3.8dB)
Test Tape
3kHz, 0dB Tape speed/WOW check
10kHz, —10dB Azimuth adjustment
P-4-L300 315Hz, 0dB PB level adjustment
Tape Speed/WOW check
Procedure:
Test tape
Frequency counter
WS-48B (3kHz, 0dB) & WOW meter
47kQ.
Se
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LINE OUT
L-CH or R-CH
1. Play back the top of test tape to measure its output
frequency and WOW value.
2. Invert test tape and perform same measurement, then check
for difference between top and end of tape.
Specification :
Tape speed deviation : within 2,990 to 3,010Hz
Tape speed fluctuation : within 2,990 to 3,010Hz
WOW (WRMS) : 0.047% less
MPX Filter Check
Condition :
DOLBY NR switch : OFF
MPX FILTER switch : OFF
REC LEVEL control : Standard record
MONITOR switch : SOURCE
Procedure :
1. Mode : stop
AF OSC
VTVM
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LINE OUT
LINE IN
315Hz, 0.5V (-3.8dB)
2. Applying 19kHz, 0.5V (—3.8dB) signal, measure the LINE
OUT level.
Specification :
DOLBY NR switch : Either B, C or S
MPX FILTER switch : ON, LINE OUT level must be,
315Hz : within 0.44 to 0.56V (within —4.8 to —2.8dB)
19kHz : 15.8mV (—33.8dB) or less