JVC RC-XC3BK

6. Main Adjustment
Mi Test Instruments reqired for adjustment
1. Low frequency oscillator
(oscillation frequency: 50Hz to 20kHz)
( Output : 0 dBs with 60 {2 terminator)
2. Attenuator( Impedance : 600 {2 )
3. Test Tapes
VTT712 srrcrereresccsecsscens For tape speed,wow and
flutter measurement
VTT724 treceerereeeeeeeenees For play back output level
Vat Acie Ree For playback frequency
response check
VT T7038 trrssetereeees For head azimuth measurement
4, Electronic voitmeter, Distortion meter
5. Resistor...600 2 for attenuator matching
6. Torque gaugersss+sss+ Cassette type for CTG-N
mechanism adjustment
7. Wow and Flutter meter , Frequency counter
8. Blank tape:::-- Normal :AC- 225,Chrome : AC- 514
9, Extension Cord ssssrsrrresesrereceseeeeees EXTXC1 - JIG
@ Measuring conditions (Amplifier section)
Supply Voltage vorsrerssseesseeeeeeeeeees ***AC230V (60Hz)
Reference output : Speaker +++-*- 0 dBs (0.775V) /4 Q2
(Volume range 28 — 29)
: Headphone : — 27 dBs (0.775V)/ 32 Q
(Volume range ;Maximum)
@ Standard position of functionswitches
FUNCTION SWitCh ccctere cee ee teeter eee tent eee e cece eeeeee TAPE
SUraund SWitche ssrrerereeeceeee eect eeeeeeeeeeeeeeeeeees OFF
P, SOUNd serrrccerececccecesseccresccccssessevees Flat position
Super DASS tere er reese cess cesccensesscsssnssnssssesscnens OFF
Main volume adjust srrressrstressee ee 0 dBs Vol28 — 29)
@ Test remarks
1. Negative side of the input and output on the testing
set, that ought to be separately to each other, and
then bear in mind there connection the testing set with
2 channeles Electronic voltmeter, the negative side
never connect commonly.
RC — XC3BK B/E/EN/G/GI
2. Replaced output load with a dummy and that lead
wire to be used as big as posible.
3. Attach top cover when measuring and connect filter
shown below Fig. 1 to V. meter.
li Measuring condition (Radio section)
Refer to rating SOUrCE **s+t tet teteer ees Tuner+B : DC 5.7V
Reference output --::-- Speaker : 20mMW(0.245 V)/3 Q
Headphone : (0.07V)/ 32 (2
AM frequency srrsrrrereeeeeeeeeeee A00Hz modulation 30%
FM frequency srrcreereeeeeeeeteeeeesees 400Hz modulation
frequency deviation 22.5kHz
@ Standard position of switches and controllers
FUnGHOTs des ses nexeemenssea ds coteues s Gevve rates fee RADIO
@ Careful points for adjustment
1. Connect 30 pF capacitor and 33 k Q resistor to the
output side of the IF sweeper in series while 0.082 u
F capacitor and 100k {2 resistor to the input side in
series.
2.Set output level of the IF sweeper as minimum as
adjustable.
3. RF Alignment order
Procedure of the steps of tracking should be kept.
(No. 1991) 41