Sony DNS313F - S2 Sports CD Walkman, Service Manual

Page: 6 / 30

6
D-NS313F
SECTION 4
ELECTRICAL ADJUSTMENTS
[TUNER SECTION]
CLOCK SHIFT ADJUSTMENT
Connection:
Adjusting Procedure:
1. Connect the frequency counter to TP471 (SIFT) and TP005
(RFGND (A)) or TP003 (RFGND (B)) on the MAIN board.
2. Set the AM 621 kHz (9kHz step model) or AM 620 kHz
(10kHz step model)
3. Adjust the RV471 so that the reading of frequency counter is
180
±
1 kHz.
0 dB=1
µ
V
[AM]
Setting:
Function: RADIO
Band: AM
AVLS: OFF
[FM]
Setting:
Function: RADIO
Band: FM
AVLS: OFF
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
+
–
frequency counter
TP471 (SIFT)
TP005 (RFGND (A)) or
TP003 (RFGND (B))
MAIN board
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
32
Ω
MAIN board
TP005 (RFGND (A)) or
TP003 (RFGND (B))
MAIN board
TP012 (TU_L) or
TP014 (TU_R)
FM RF signal
generator
33.75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
level meter
set
32
Ω
0.01
µ
F
MAIN board
TP002 (RF (A)) or
TP001 (RF (B))
MAIN board
TP005 (RFGND (A)) or
TP003 (RFGND (B))
MAIN board
TP005 (RFGND (A)) or
TP003 (RFGND (B))
MAIN board
TP012 (TU_L) or
TP014 (TU_R)
digital voltmeter
TP006 (VT)
TP005 (RFGND (A)) or
TP003 (RFGND (B))
100 k
Ω
MAIN board
( ): 9kHz step model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T002 620 (621) kHz
( ): 9kHz step model
AM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part Frequency Display Reading in Digital Voltmeter
Confirmation 530 (531) kHz 0.8
±
0.5 V
Confirmation 1,710 (1,602) kHz 7.2 (6.8)
±
1.0 V
( ): 9kHz step model
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
T001 620 (621) kHz
CT001 1,400 (1,404) kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading in Digital Voltmeter
Confirmation 87.5 MHz 2.8
±
1.0 V
L004 108 MHz 8.0
±
1.0 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L003 98 MHz
Adjustment and Connecting Location: MAIN board
(See page 7)