GX-CD30/30C/130/130C
MECHANISM SECTION
• Driving Force Check
PLAY: TW-2412
Tape 1: Over 50 g
Tape 2: Over 100 g
Torque Meter
Specified Value
• Torque Check
Torque Meter
Specified Value
Play: TW-2111
30 to 60 g.cm
30 to 60 g.cm
Fast Forward: TW-2231
80 to 135 g.cm
Rewind: TW-2231
80 to 135 g.cm
Tape 1
Tape 2
• Tape Speed
Nomal
MTT-111
3,000
Speaker
speed
±
30 Hz
terminal
(Load resistance:
6 ohms)
Instrument
Connection
Specified
Value
Test Tape
TAPE SECTION
Position of each switch or control
Volume control
Max
Beat cancel
A
Function/Power switch
Tape/Off
• Bias Oscillation Check
Beat cancel
A: 82 + 10 kHz / -6 kHz
B: -2
±
2 kHz
C: +3
±
2 kHz
Specified Value
• Erase Current Check
Specified Value
Resistor for measurement: 1 ohm
50
±
25 mV
• Playback Amplifier Sensitivity Check
Instrument Connection
Test Tape
MTT-118
1.8 V
±
3 dB
Speaker Terminal
(Load resistance: 6 ohms)
Specified Value
ADJUSTMENT
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• FM IF/RF
IF
T1
Detection
T2
Band Coverage
fL: L2
fH: TC2
Tracking
88.0 MHz: L1
108.0 MHz: TC1
Test Stage
Specified
Value/Adjusting
Point
Instrument
Connection
Input: Pin 1 of IC1
Output: Pin 17 of IC2
Iuput: Antenna
Output: Headphones
Socket (Load
resistance: 32 ohms)
• AM IF/RF
IF
T3
Input: Antenna
Output: Pin 19 of IC2
Band Coverage
fL: L4
Input: Antenna
fH: TC4
Output: Headphones
Tracking
600 kHz: L3
Socket (Load
1,400 kHz: TC3
resistance: 32 ohms)
Test Stage
Specified
Value/Adjusting
Point
Instrument
Connection
• VCO Frequency
Specified
Value
Instrument
Connection
VR1
76 kHz
±
200 Hz
Pin 13, pin 21 and
ground of IC2
Adjusting Point
Note:
After preparing the test circuit shown in Fig. 8-1, connect the
Pin 13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value. At this time, apply a standard unmodulated
signal input and adjust the VCO.
– 8 –
Pin 13 of IC2
Pin 21 of IC2
D
G
S
10 kohm
TO FREQUENCY
COUNTER
FET : 2SK19 or 2SK54
Figure 8-1 VCO FREQUENCY TEST CIRCUIT
AM TRACKING
fH
AM BAND
fH
fL COVERAGE
FM
AM TRACKING fL
AM BARANTENNA
fH
fL
TRACKING
FM BAND
fL
fH COVERAGE
VCO
L4
VR1
TC4
TC3
TC1
1
TC2
L2
L1
L3
T2
T1
T3
FM DET
AM IF
FM IF
FM RF
IC2
IC1
13
1
17
19
21
Figure 8-2 ADJUSTMENT POINTS
Summary of Contents for GX-CD130
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