Main Adjustment - JVC KS-RT70 B Service Manual

S — RT70.B/E/G/GE/GI |
[3] Main Adjustment
gw Equipment and measuring instruments used
for adjustment
@ Electronic voltmetor
@ Audio frequency oscillator
(range:50~20kHz and output 0 dB with impedance of
600 Q )
@ Attenuator(impedance;600 2 )}
@ Frequebcy counter
@ AM Standard signal generator
@ FM Standard signal generator
@ Wow flutter mater
@ Torqu testing cassette gauge
CTG — N (mechanical adjusting)
TW — 2111A (FWD play)
TW — 2121A (REV play)
@ Standard tape
VTT704(head azimuth adj.)
VTT712(tape speed, wow&flutter adj.)
VTT724(reference level )
VTT736(playback frequency response )
VTT721 (output level)
SCC — 1659 (mirrer tape)
MTT — 942SP (azimuth)
Hi Location of Adjustment
@ SUB Board
@ MAIN Board
[]ere
VR301
VR740
[C701 f
7C701 S
[ler
[ow
18 (No.49178)
@ Condition for measurement
'@ Power Supply --- +s er ees e eee eee eee eee es DC14.4V
(Reduced Voltage:10.5V)
@ LOA 1s reece ee eee eee eee ee 42
(Tow speaker connection)
@ BASS/TRE, FADER «++ sere rere eee eee eee Center
@ Main volume---------::- Position with an output level
of 1.4V during VTT724 playback
Wi Tuner section
@ [FM);400Hz, 22.5kHz deviation
@ [FMIJSTEREO ;1kHz, 67.5kHz deviation,
pilotsignal 7.5kHz
@ [AM);400Hz, 30% modulation
@ Output impedance ;50 Q
Bm Dummy antenna
Plug to fit
antenna jack
ial
SSG Level Soon ekg
6608» f fogs N
—
ra
GOR; input Level
i 1 .
t " 6OpF Metal shield
AM SSG 502 1 pial ~must be attached to plug
AM DUMMY ANTENNA
@ Preset memory Initialization
Preset Memory
| Band m1 | M2 | m3 | M4 | M5 | M6
FM(MHz) | 87.5 | 89.9 | 97.9 | 105.9| 108 | 875.
AM(kHz) | 144 | 153 | 522 | 603 | 1404 | 1690
@ Manual Tuning Up/Down Frequency
FM) ;50kHz Step —
(AM) ;9kHz Step
130[O] (C/J) (E/6)
'tome SS pad
CJ904 C3905
(C/} 3PIN)
(E/G SPIN)