Read Sony ICF-M88B Service Manual online
8
ICF-M88B
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L1
530 kHz
1.2
± 0.1 V
Confirmation
1,710 kHz
7.2
± 0.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
ANT1
590 kHz
CT1
1,490 kHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
108.0 MHz
8.9
± 1.0 V
Confirmation
87.5 MHz
2.3
± 0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
87.5 MHz
CT2
108.0 MHz
Adjustment Location: MAIN board (See page 9)
0 dB=1
µ
V
[AM]
Setting:
Function: RADIO
BAND: AM
Function: RADIO
BAND: AM
[FM]
Setting:
Function: RADIO
BAND: FM
Function: RADIO
BAND: FM
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
• 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
TP15 (AF GND)
TP15 (AF GND)
MAIN board
TP12 (SP OUT)
TP12 (SP OUT)
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
TP15 (AF GND)
TP15 (AF GND)
MAIN board
TP12 (SP OUT)
TP12 (SP OUT)
set
8
Ω
0.01
µ
F
MAIN board
TP10 (RF GND)
TP10 (RF GND)
MAIN board
TP13 (FM IN)
TP13 (FM IN)
digital voltmeter
TP9 (VT)
TP8 (GND)
100 k
Ω
MAIN board
SECTION 5
ELECTRICAL ADJUSTMENTS
Click on the first or last page to see other ICF-M88B service manuals if exist.