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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)
T P 4 5 0 _ '
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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