Sanyo RD 30 - Electrical Adjustments Overview; Required Equipment for Electrical Adjustments; Head Azimuth Adjustment; Tape Speed Adjustment

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ELECTRICAL ADJUSTMENTS
QUIRED EQUIPMENTS
VTVM (2 Sets)
Frequency Counter
Audio Signal Generator
Attenuator
Dummy Load (47k-ohm)
Dualtrace Synchroscope
Test Tapes
* 3kHz test tape (Example: TEAC MTT-111) for Tape
Speed Adjustment
* 10kHz test tape (Example: TEAC MTT-114) for Head
Azimuth Adjustment
* Test Tape for Dolby Level Calibration (Example: TEAC
MTT-150 in Playback Gain Adjustment
Test Tapes for recording and playback operations
* Normal Tape (Example: TDK AC-220)
* Ferrichromium Tape (Example: SONY DUAD C-60)
* Chromium Dioxide Tape (Example: TDK AC-511)
Alignment Too!
Prior to the Electrical Adjustments, set the unit and
the measuring instruments as follows:
TA
I:
2:
Bias Switch, ....2s sic. % oS Pee acs gon vk 6 NORM
EQ Switch: &. 2 icecGr2 Dche OS eH ee dle he ee NORM
Input Select Switch ........ 0... 00. c eee eee LINE
Dolby NR Switch .. 1... 0... 0.0002 ee eee OFF
Record Mute Switch. ....... 0.000 cee eee eee OFF
Input LevelControl .............-.2050- Maximum
Audio Signal Generator output........ 1kHz0dB,1V
NOTE:
The Electrical Adjustments should be preformed in the
order as below.
PE SPEED ADJUSTMENT
Remove the Cover from the unit and connect a frequency
counter to the left or right channel LINE OUT as illustrated.
Then, insert a 3kHz test tape (Example: TEAC MTT-111)
into the cassette compartment.
Frequency Counter
3kHz (41%)
LINE OUT
PLAYBACK
47k-ohm
Dummy Load
HEAD AZIMUTH ADJUSTMENT
1,
Remove the cassette compartment lid from the Unit and
connect a dualtrace synchroscope and two VTVM to the
both channel LINE OUT as illustrated. Then, set the
synchroscope as follows:
* MODE
* SOURCE
* SWEEP MODE
dirt d Mate ctel Be etd 88 og SMe lB CHOP (chopped)
INT {internal}, CH1 or CH2
AUTO (automatic)
NOTE:
Adjust the field on the synchroscope with the VOLT. ADJ.
and TIME ADJ.
Dualtrace Synchroscope
VTVM (Max.)
LINE OUT
PLAYBACK
2. Insert a 10kHz test tape (Example: TEAC MTT-114} into
the cassette compartment and check to see that the phase
difference of the Right and Left channels on the
synchroscope while the test tape is being played back.
3. Then, turn the azimuth adjusting screw until the wave forms
of the Right and Left channels are superimposed and set to
optimum at maximum reading of the VT VM.
Adjustment
Sie
R/P Head
Adjustment Screw
S
While the test tape is being played back, adjust the
potentiometer inside the Motor by turning it until the 4.
frequency counter reads 3 kHz (+1%).
After the adjustment, secure the azimuth adjusting screw
with paint or glue.
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