Sony CFM-A50 - Page 9

– 9 – – 11 –– 10 –
TUNER SECTION
AM Section
Function switch : RADIO
Band switch : AM (US model)
MW or LW (AEP, UK model)
Volume : MIN
FM Section
Function switch : RADIO
Band switch : FM
Volume : MIN
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
( ) : AEP, UK only
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1 455kHz
AM (MW) FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 520kHz
CT1 – 2 1,780kHz (1,680kHz)
AM (MW) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6 (L6 – 1) 620kHz
CT1 – 1 1,400kHz
Tape Speed Adjustment
Procedure :
1. Mode : Playback (Normal Speed)
2. Adjust RV103 so becomes the adjustment value below.
3. Set to slow playback switch (S105) ON mode.
Confirm that the become adjustment value as to follows.
Adjustment Value :
Speed checker Digital frequency counter
–1 to +1% 2,970 – 3,030Hz
Frequency difference between the beginning and the end of the tape
should be within 1.5% (45Hz).
Adjustment Location :
set
test tape
WS-48B
(3kHz, 0dB)
32
Ω
speed checker
LFM-30 or
digital frequenc
y
counter
J101 (Earphone jack)
[DECK CONTROL BOARD]
(Component side)
RV103 : Tape speed Adjustmen
t
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
set
32 Ω
J101 (Earphone jack)
level mete
r
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
telescopi
c
antenna
terminal
0.01
µ F
set
32 Ω
J101 (Earphone jack)
level mete
r
r
CIRCUIT BOARDS LOCATION
MAIN board
BATTERY board
DECK CONTROL board
TACT SW board
H/P JACK board
TUN LED board
POWER board
VOLUME board
ISS SW board
(AEP, UK model)
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 86.5MHz (87MHz)
CT1 – 4 109.5MHz (108.30MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 86.5MHz (87MHz)
CT1 – 3 109.5MHz (108.30MHz)
AEP, UK model
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 145kHz
CT6 300kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L6 – 2 145kHz
CT5 300kHz
Adjustment Location : MAIN board (Component side)
[MAIN BOARD] (Component side)
CT1–3 : FM Tracking Adjustment
CT1–1 : MW Tracking Adjustment
CT5 : LW Tracking Adjustment
L6–2: LW Tracking Adjustment
L6–1: MW Tracking Adjustment
T1 : AM IF Alignment
L2 : FM Frequency Coverage Adjustment
CT1–2 : MW Frequency Coverage Adjustment
CT1–4 : FM Frequency
Coverage Adjustment
L3 : MW Frequency Coverage Adjustment
CT6 : LW Frequency
Coverage Adjustment
L4 : LW Frequency
Coverage Adjustment
L1 : FM Tracking Adjustment
[MAIN BOARD] (Component side)
CT1–3 : FM Tracking Adjustment
CT1–1 : AM Tracking Adjustment
L6 : AM Tracking Adjustment
T1 : AM IF Alignment
L2 : FM Frequency Coverage Adjustment
CT1–2 : AM Frequency Coverage Adjustment
CT1–4 : FM Frequency
Coverage Adjustment
L3 : AM Frequency Coverage Adjustment
L1 : FM Tracking Adjustment
AEP, UK model
US model
SECTION 5
DIAGRAMS