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Tuner Adjustments - Sanyo MCD-Z250F Service Manual

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REPLACEMENT
OF CD MECHANISM
f. Resetting
the pickup to the home position
(1)
The limit switch is switched
ON by the projection
of this rack
gear secured to the relurned pickup, atter which the sled motor
continues to operate
(by the circuit) for approximately
30 msec.
: There
is then again a reverse
operation,
and movement
to
the position at which the switch k swffched
OFF.
(2)
Rotation
continues
during about 30 msec,
after the switch is
switched
OFF.
And then the pickup stops at home position.
cri4
'CM5
C;4
CM5
CONFIRM
OF CD
SECTION
a. Preparation
.
Measuring
instruments
and Test disc.
(1)
Test Disc : YEDS
18 (SONY)
(2)
Oscilloscope:
SS5711
(10 MHz and Dual Phenomenon)
NOTE : CD
section of this unit can not need adjustment,
because
CD P.W.Board
checked at automatic checker.
b. Confirm of general operation
(1)
Set the test disc.
(2)
Press the PLAY button, then confirm the disc ro!aling to clockwise direction.
(3)
Press the SKIP/SEARCH
button, then confirm the most inner music or most outer music accessing at speedy.
(4)
Press the STOP
button.
c. Confirm of eye pattern
+~
(1)
(2)
(3)
(4)
Connect
an oscilloscope
to RF(=IC101
pin41 (H)) and VR
RF
~
(J1315).
Set the test disc, press the PLAY button.
Check to be sure that the "eye" pattern "isat center of waveform
VR
~
and that the diamond
shape is clearly defined.
Press the STOP
button.
TUNER ADJUSTMENTS
. Use a plastic screw driver for adjustments.
. Adjust the intermediate
frequency
of AM and FM to the frequency
of ceramic
filter.
Supply voltage
: DC 12.OV
Phones
impedance
: 32 ohms
Function
switch
: RADIO
a. Parts
Location
TP2 TP3
1P12 1P6
p-y
~
L2102
C20CN
El
L2204
En
XF213
o
@3 L2002
4
J2101
1P 1
b. AM Adjustment
BAND
SELECT
SWITCH
: AM
Step
Adjusting
I
Tuning
Input Connection
I
Output Connection
Adjustment
Circuit
Frequency
Measurement
Input
Measurement
output
Pa7fs
VTVM Oscill
1
AM Sweep
VTVM
TP8
(H)
(45~kHz)
1000 kHz
Generator
'oop 'NT
Oscilloscope
TP7
(E)
XF213
A
(Non-adiuslm
.
2
Tuning
520 kHz
Digital
TP6
(H)
12204
1.o&o.05v
Coverage
3
1710
kHz
Voftme!er
TP12
(E)
_
Confirm 3.8 *0
OSCILLOSCOPE
4
60fJ kHz
AM Signal
VTVM
TPI O(L)
Tracking
L2102
Generator
'oop
'NT
Oscilloscope
TP11 (R)
5
- Maximum
l&O
kHz
TP9
(E)
CT201
DED
b
-6.
c. FM Adjustment
BAND
SELECT
SWITCH
: FM
FM Dummy Antenna :75 ohm unbala
Step
Adjusting
Tuning
Input Connection
Output Connection
Adjustment
Circuit
Frequency
Measurement
Input
Parts
vTVM
Oscill
Measurement
output
n
1
FM Sweep
TP2 (H)
VTVM
(1 O.#MHz)
98.1
MHz
Generator
TP3 (E)
OscilloscO~
2
Tuning
87.9 MHz
Digital
Coverage
3
107.9
MHz
Voltmeter
4
t
90.1 MHz
Tracking
FM
Signal
TP1 (H)
VTVM
5
105.7
MHz
Generator
TP3 (E)
Oscilloscope
-7-

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