4-3-29. Hi-Fi AUDIO HEAD
SWITCHING SHIFTER ADJ.
BOARD
AUDIO C.B.A.
TP
TP4501 (C-1), TP4502(C-1)
ADJ
VR4507
(D-1
)
TAPE
VFM8180HADH
PORTION: 2
INPUT
MODE
PLAY
M.EQ
OSCILLOSCOPE
SPEC
SEE FIGURE
E28
1.
Connect the oscilloscope to TP4502 (FM H.SW)
for
CH
1 and TP4501
(FM
ENV) for CH2.
2.
Playback the alignment tape
(VFMB1BOHAOH)
portion
1.
3.
Adjust VR4507
so
that there
is
no drop-out while
push the Tracking buttons
("+"
or
"_")
as shown
in
Figure
E2B.
TP4502
(FM
HEAD
SW)
TP450_'
1
_______
1
______
t NO DROP-OUT t
Figure
E2B
4-3-30. Hi-Fi AUDIO CARRIER
FREQUENCY ADJ.
BOARD
FM
AUDIO
TP
Pin25iCHll,
Pin2'!(CH~
of
FM
AUDIO PACK
ADJ
VR4405
(CH1
)(F-2) , VR4402 (CH2)(E-4)
TAPE
INPUT
NO SIGNAL
MODE
STOP
M.EQ FREQUENCY COUNTER
SPEC
1.4MHz±1 OKHziCH111.8MHz±1 OKHz(CH2)
[SET UP]
HI-FI
REC:
ON
(OSO)
1.
Ground the Audio Inputs (CH1, CH2).
2.
Counect a counter to pin2S of
FM
Audio Pack.
3.
Adjust VR440S (CH1)
so
that the frequency
becomes 1.4MHz
± 10KHz.
4.
Connect a counter to pin24 of
FM
Audio Pack.
5.
Adjust VR4402 (CH2) so that the frequency
becomes 1.BMHz
± 10KHz.
4-3-31. Hi-Fi AUDIO DEVIATION ADJ.
BOARD
FM
AUDIO
TP
AUDIO OUTPUT
lCH1,
CH2)
ADJ
VR4407.iCHlliE-11
VR44011CH?l<E-4)
TAPE
SELF RECORDED TAPE
INPUT
1 KHz, -8dBv SINEWAVE
MODE
PLAY
M.EQ
V.T.V.M
or
OSCILLOSCOPE
SPEC
-8dBv + O.5dBv
[SET UP]
HI-FI REC
ON
AUDIO OUT Hi-Fi
1.
Set the Hi-Fi audio level control VR (CH1, CH2)
on
the Front Panel to the center click position.
2.
Supply 1 KHz, -BdBv sinewave signal to the audio
inputs (CH1, CH2).
3.
Record it for a few minutes.
4.
Playback the recorded portion.
5.
Connect a scope to the Audio outputs (CH1, CH2).
6.
Adjust VR4407 (CH1) so that the level becomes
-BdBv
±
O.SdBv.
7.
Adjust VR4401 (CH2)
so
that the level becomes
-BdBv
±
O.SdBv.
4-13
~
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