Dolby Nb Level Adjustment; Am Adjustment; Fm Adjustment; Wb Adjustment - Pioneer KE-81ZBM-02 Service Manual

KE-B1ZBM-OS
5.
1
DOLBY NR
LEVEL ADJUSTMENT
Na
Cassette Tape Adjusting Point
Adjustment Method
(Switch Position)
1
NCT
-
150 (400Hz
,
200nwb/m)
VR251(Lch).VR252(Rch) mV Meter
(1)
:300mV±
IdB
(300mV=-8.24dBs)
(DOLBY NR Switch:0FF)
5. 2
AM
ADJUSTMENT
Na AM
SSG(400Hz,30%
)
Displayed
Frequency
(kHz)
Adjusting
Point
Adjustment Method
(Switch Position)
Frequency (kHz) Level (dB)
Tun-
ing
Volt
1
1.620
DC V Me
ter:
Less than 8.5V
2
530
DC
V
Me
ter:
More than 0.8V
Tra-
cki-
ng
1
600 20 600
T203.T204.
T206.T207
mV Meter
(2)
:
Maxi mum
2 600
1.000
1.400
35
j
600
1.000
1.400
The difference between the
maximum and minimum output
levels at 600kHz
,
1.000k-
Hz and 1.400kHz must be
6dB or
less.
5.
4
WB
ADJUSTMENT
Na FM
SSG(400Hz.l0O%
)
Displayed
Frequency
(MHz)
Adjusting
Point
Adjustment Method
(Switch Position)
Frequency
(MHz)
Level
(dB)
1
L803 Frequency Counter:
151.775MHz
NOTE: After adjusting L803.
disconnect frequency
counter
2
162.400
60
NB
Volume
control
knob
mV Meter
(2)
:10dBs
3
162.400 60
m
L808
Distortion Meter:Minimum
4
162.400 60
WB L807
Distortion MeteriMinimum
5
Repeat No.
3.
4 alternately so that the
distortion meter indicates minimum.
6
162.475
10-15
WB L801.L802 mV Meter (2) '.Maximum
7 162.475
10-15
WB L804 mV Me ter
(2)
:
Maxi mum
8 If L804 is
adjusted more than one quarter
turn.
repeat No.
1.
9
Repeat
No.
6.
7
alternately so that the mV meter(2) indicates
maximum output.
5. 3
FM
ADJUSTMENT
Stereo MOD.: lkHz,L+R = 90% .Pilot = 10%
Na
FM SSG(400Hz.l00%) Displayed
Frequency
(MHz)
Adj us ting
Point
Adjustment Method
(Switch Position)
Frequency (MHz) Level
(dB)
IF
1
98.1
Unmodulated
60 98.1
T51 Center Meter:0
Tra-
cki-
ng
1
107.9
10
107.9 L3 DC V
Meter:7.0V±0.1V
2
87.9 10 87.9
DC
V
Me
ter:
More than 1.5V
3
90.1 10 90.1
L1.L2 mV Me ter
(2)
:
Maxi mum
98.1 10 98.1
T2 mV Me ter
(2)
:
Maxi mum
MPX
j
1
98.15K 60 98.1
VRIOI mV Meter
(2)
:
Best separation
ARC
1
m.m
35 98.1 VR51
mV Meter
(2)
:
Separation 5dB
6
7