Service manual

– 9 –
XL-520W/CP-520
MECHANISM SECTION
• Driving Force Check
Torque Meter
Specified Value
Play: TW-2412 Over 80 g
• Torque Check
Torque Meter
Play: TW-2111 30 to 70 g. cm
Fast forward: TW-2231 50 to 140 g.cm
Rewind: TW-2231 50 to 140 g.cm
Specified
Value
Adjusting
Point
Instrument
Connection
Test Tape
MTT-111 Motor 3,000 ± Headphone
90 Hz Socket
ADJUSTMENT
Specified Value
• Tape Speed
Figure 9-1 ADJUSTMENT POINT
TAPE MECHANISM
M901
Motor
Volume in motor
Figure 9-2 ADJUSTMENT POINTS
SO301
ANTENNA
TERMINAL
MAIN PWB
CNP301
L302
IC301
1
T302
TP301
TP302
T304
FM IF
AM IF
AM
TRACKING fL
T306
AM BAND
COVERAGE fL
FM MUTE
LEVEL
T351
VR351
L303
FM BAND
COVERAGE fL
FM RF
fL: Low-range frequency
fH: High-renge frequency
IF 450 kHz 1,602 kHz T351 *1
Band — 531 kHz (fL): T306 *2
Coverage 1.1 ± 0.1 V
Tracking 990 kHz 990 kHz (fL): T302 *1
Test Stage
Frequency Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
Adjusting
Parts
Instrument
Connection
Display
Frequency
98.00 MHz 98.00 MHz VR351* Input: SO301
(25 dBµV) Output: Speaker
Terminal
TUNER SECTION
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Band — 87.50 MHz (fL): L303 *1
Coverage 3.4 ± 0.1 V
RF 98.00 MHz 98.00 MHz L302 *2
(10-30 dB)
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: TP301
*2. Input: Antenna, Output: Speaker Terminal
• Detection
Signal generator: 10.7 MHz, FM sweep generator
IF 10.7 MHz 98.00 MHz T304(Turn Input: Pin 1 of
the core of IC301
T304 fully Output: TP302
counter-
clockwise.
Test
Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected, Output: TP301
• Setting the Test Mode
Keeping the BAND button and MEMORY button pressed, turn
on POWER. Then, the frequency is initially set in the memory
as shown in Table. Call it with the , button to use it
for adjustment and check of tuner circuit.
Preset No.
FM
Preset No.
AM
1 87.50 MHz 6 531 kHz
2 108.00 MHz 7 1,602 kHz
3 98.00 MHz 8 990 kHz
4 90.00 MHz 9 603 kHz
5 106.00 MHz 10 1,404 kHz
11~40
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
*Adjust so that an output signal appears.
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated