Service manual

CD-C449W/K449W
– 14 –
Figure 14 ADJUSTMENT POINTS
Instrument
Connection
• FM RF
Signal generator: 1 kHz, 40 kHz dev, FM modulated
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Band — 87.5 kHz (fL): LT02 *1
Coverage 3.7 ± 0.1 V
RF 98 MHz 98 MHz LT01 *2
10 - 30 dB
*1. Input: Antenna, Output: TP301
*2. Input: Anetnna, Output: Speaker Terminal
• Setting the Test Mode
Keeping the PAUSE button and TUNER button pressed, turn
on POWER. Then, the frequency is initially set in the memory
as shown in Table. Call it with the PRESET button to use it for
adjustment and check of tuner circuit.
Preset
No.
1 87.50 MHz 6 531 kHz 11 3.2 MHz 16 9.5 MHz
2 108.00 MHz 7 1,602 kHz 12 7.3 MHz 17 21.85MHz
3 90.00 MHz 8 603 kHz 13 3.9 MHz 18 11.65 MHz
4 106.00 MHz 9 1,404 kHz 14 7.1 MHz 19 21.45 MHz
5 98.00 MHz 10 990 kHz 15 5.06 MHz 20 15.1 MHz
21 ~ 40
FM Preset
No.
MW
SW2
Preset
No.
SW1
Preset
No.
• FM Detection
Signal generator: 10.7 MHz, FM sweep
Test Stage
Instrument
Connection
Frequency
Frequency
Display
Setting/
Adjusting
Parts
IF 10.7 MHz 98 MHz TT01 *1
(Turn the
core of trans-
former TT01
fully counter-
clock wise)
*1. Input: Antenna, Output: TP301
*2. Input: Anetnna, Output: Speaker Terminal
*1. Adjust so that an output signal appears.
• FM Mute Level
Signal generator: 1kHz, 40 kHz dev., FM modulated
Frequency Adjusting
Parts
Instrument
Connection
Frequency
Display
98.00 MHz 98.00 MHz VR351 *1 Input: Antenna
(25 dBµV) Output: Speaker
Terminal
TUNER PWB
AM IF
T351
VR351
LT02
TT01
T303TC303
T304TC302
T302
T308 TC304
T307 TC305
T306
LT01
MW Band
Coverage
FM Mute
Level
FM Band
Coverage
MW
Tracking
IC303
SW2 Tracking
fH fL
TP302
SW1 Band
Coverage
fL fH
SW1
Tracking
fH fL
SW2
Coverage
fL fH
TP301
R357
FM IF FM RF
SO301
ANTENNA
TERMINAL