Sony ICF-CD855 / ICF-CD855L Service Manual ▷ View online
10
ICF-CD855/CD855L
SECTION 4
TEST MODE
LCD, LED AND KEY TEST MODE
Procedure:
1. Turn the power on while pressing simultaneously three but-
1. Turn the power on while pressing simultaneously three but-
tons of
[RADIO ON/BAND]
,
[CLOCK]
, and
[MODE]
.
2. The microcomputer version will be displayed on the LCD.
3. Press the
3. Press the
SNOOZE•SLEEP OFF
button. (The LCD display
will become as follows)
LCD display
4. BEEP (A) will be output and the display corresponding to a
button is turned off, if a button on the set is pressed. Also,
BEEP (A) is output when the button is released.
BEEP (A) is output when the button is released.
Button Corresponding Table
Button
Segment
CLOCK
AM, PM, : (colon),
ALARM A
ALARM A, AM (ALARM A),
PM (ALARM A), 1 (ALARM A),
2 (ALARM A), 7 segment 1/2/3,
ALARM A LED
PM (ALARM A), 1 (ALARM A),
2 (ALARM A), 7 segment 1/2/3,
ALARM A LED
ALARM B
ALARM B, AM (ALARM B),
PM (ALARM B), 1 (ALARM B),
2 (ALARM B), 7 segment 7/8/9,
ALARM B LED
PM (ALARM B), 1 (ALARM B),
2 (ALARM B), 7 segment 7/8/9,
ALARM B LED
VOL +
– VOL –
VOL –
4e, 4f, 5a, 5d, 5e, 6b, 6e
SLEEP
SLEEP
NAP
NAP
1
1b, 1c
2
2a, 2b, 2d, 2e, 2g
3
4a, 4b, 4c, 4d, 4g
4
5b, 5c, 5f, 5g
5
6a, 6c, 6d, 6f, 6g
TUNE/TIME SET – .
7 segment 11
TUNE/TIME SET + >
7 segment 10
RADIO ON, BAND
RADIO, WEATHER, TV, FM1,
FM2, LW, MW
FM2, LW, MW
OFF x
MHz, kHz
CD u
CD, B, TRACK , WAKE UP
MODE
REP, 1, ALL, SHUFFLE,
FM-MONO
FM-MONO
5. After all buttons on the set were pressed, press
the
SNOOZE•SLEEP OFF
button, and BEEP (B) will be out-
put and the test mode will be terminated.
6. If there is even one button that was not accepted, the set will
n o t be released f r o m test mode eve n t h o u g h
the
the
SNOOZE•SLEEP OFF
button is pressed.
7. The set will return to normal state when the LCD, LED AND
KEY TEST MODE is terminated.
RADIO
SLEEP
WEATHER
FM1FM2
LWTVAM
MWPM
FM MONO
AM
SHUFFLE
REP 1 ALL
REP 1 ALL
WAKE UP
TRACK
VOL
CD
PM
MHz
kHz
ALARM A
ALARM B
NAP
AM
PM
11
ICF-CD855/CD855L
CD TEST MODE
Procedure:
1. Connect 22 k
1. Connect 22 k
Ω and 100 kΩ resistors in parallel to the end of S618 on the LCD board, and short another end of resistors to the GND,
and the CD TEST MODE will be activated.
2. Insert a CD disc.
3. Turn the power on. Press the
3. Turn the power on. Press the
CD
u
button.
4. The following shows the state transition table for each button operation in respective sub modes of CD TEST MODE.
State Transition Table
If each button is pressed in respective sub modes, the mode will transit to the sub modes listed in table.
Mode transits to sub modes listed in table, if a button is pressed in respective sub modes.
5.
Turn the power off to release the CD TEST MODE.
MODE
Explanation
LCD
Button
MAIN
SUB
OFF
CD
–
+
RADIO ON
SLEEP
–
+
Processing
BAND
end
Long pressed
INT
State when TEST MODE is activated.
0
STOP0
FOCUS0
STOP
STOP0
State when a button is pressed once from initial state.
1
FOCUS0
SLDF
SLDF
SLDR
SLDR
EF
ADJ1:11
Normal
STOP0
Automatically adjusted value is held.
2
STOP0
FOCUS0
Normal
FOCUS
FOCUS0
AUTO FOCUS transfer mode
3
STOP
FOCUS
FOCUS
FOCUS SERVO ON state.(CLV-S, TRK/SLED, SERVO OFF)
4
STOP
F.LPC
EF
AUTO
It will be referred to as LPC ON if FOCUS carries out on.
OFF
ADJ2:11
F.LPC OFF
LPC OFF in FOCUS state.
5
STOP
ALSV
FCSF
FCSF
FCSR
FCSR
SCURVE
ALL
ALSV
State where all servo systems are turned on.
7
STOP
LPC OFF
FCSF
FCSR
EF
ADJ3:11
AUTO
SERVO
ALPC OFF
State where all servo systems are turned on.(LPC:OFF)
8
STOP
TGUP
FCSF
FCSR
TGUP
State with TRK GAIN UP in all servo systems are turned on.(LPC:ON)
9
STOP
ALSV
FCSF
FCSR
AUTO
Mode in which automatic adjustment is made at once.
b
SLED
SLDF
SLED is fed outward in STOP state.
c
STOP
STOP
STOP
STOP
STOP
SLDF
SLDR
SLED is fed inward in STOP state.
d
STOP
STOP
STOP
STOP
SLDR
F.SLED
FCSF
SLED is fed outward in FOCUS state.
E
FOCUS
FOCUS
FOCUS
FOCUS
FOCUS
FCSF
FCSR
SLED is fed inward in FOCUS state.
F
FOCUS
FOCUS
STOP
FOCUS
FOCUS
FOCUS
FCDR
.
>
.
>
u
x
12
ICF-CD855/CD855L
CD-JUMP TEST MODE
Procedure:
1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board.
1. Connect the oscilloscope to TP (TE) and TP (VREF) on the CD board.
Connecting Location: CD board (See page 15)
2. Connect 22 k
Ω and 100 kΩ resistors in parallel to the end of S618 on the LCD board, and further connect 47 kΩ and 47 kΩ resistors
respectively and short them to the GND, and the CD-JUMP TEST MODE will be activated.
3. Insert a CD disc.
4. Turn the power on. Press the
4. Turn the power on. Press the
CD
u
button.
5 . If the
[MODE]
button is pressed, you can jump in fast feed or fast reverse direction with the + > or – . button by the jump
amount set in Table 1.
Table 1
LCD
Button
+
>
–
.
REP ALL
TRACK + 1
TRACK - 1
SHUFFLE
TRACK + 10
TRACK - 10
SHUFFLE, REP
TRACK + 100
TRACK - 100
Waveform of TP (TE) and TP (VREF) output in each mode is as follows.
6. Turn the power off to release the CD-JUMP TEST MODE.
REP ALL mode
500
500
µ
s/div
SHUFFLE mode
1 ms/div
1 ms/div
SHUFFLE REP mode
10 ms/div
10 ms/div
13
ICF-CD855/CD855L
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM VCO VOLTAGE ADJUSTMENT (ICF-CD855)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
530 kHz
1.0
±
0.1 V
Confirmation
1,710 kHz
5.3
±
0.7 V
AM TRACKING ADJUSTMENT (ICF-CD855)
Adjust for a maximum reading on level meter
L3
620 kHz
CT3
1,400 kHz
MW VCO VOLTAGE CONFIRMATION (ICF-CD855L)
Frequency Display
Reading on Digital Voltmeter
531 kHz
1.0
±
0.5 V
1,611 kHz
5.2
±
0.6 V
MW TRACKING ADJUSTMENT (ICF-CD855L)
Adjust for a maximum reading on level meter
L3-1
621 kHz
CT3
1,404 kHz
LW VCO VOLTAGE ADJUSTMENT (ICF-CD855L)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
153 kHz
0.6
±
0.3 V
L4
279 kHz
5.0
±
0.1 V
LW TRACKING ADJUSTMENT (ICF-CD855L)
Adjust for a maximum reading on level meter
L3-2
162 kHz
CT5
261 kHz
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
108 MHz
3.0
±
0.2 V
Confirmation
87.5 MHz
1.3
±
0.3 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
Adjustment and Connecting Location:
TUNER and MAIN board (See page 14)
TUNER and MAIN board (See page 14)
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function: RADIO
Band: AM or MW or LW
Function: RADIO
Band: AM or MW or LW
[FM/TV/WEATHER]
Setting:
Function: RADIO
BAND button: FM
Function: RADIO
BAND button: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
• Remove FM antenna in FM adjustment.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
8
Ω
MAIN board
CNP304 pin
CNP304 pin
2
MAIN board
CNP304 pin
CNP304 pin
1
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level:
as low as possible
deviation by 400 Hz
signal
Output level:
as low as possible
+
–
–
level meter
MAIN board
CNP304 pin
CNP304 pin
2
MAIN board
CNP304 pin
CNP304 pin
1
set
8
Ω
0.01
µ
F
TUNER board
TP (GND)
TP (GND)
TUNER board
TP (ANT)
TP (ANT)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
TUNER board
SECTION 5
ELECTRICAL ADJUSTMENTS
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