Sharp GX-CH170X User Manual

GX-CH170X/CH170Z
MTT-118 1.8 V ± 3 dB Speaker Terminal
(Load resistance: 6 ohms)
PLAY: TW-2412 Tape 1: Over 50 g
Tape 2: Over 100 g
MECHANISM SECTION
• Driving Force Check
Torque Meter
Specified Value
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• FM IF/RF
Test Stage
Specified
Value/Adjusting Point
Instrument
Connection
Figure 9-2 ADJUSTMENT POINTS
– 9 –
ADJUSTMENT
• Torque Check
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
Torque Meter
• Tape Speed
Nomal MTT-111 VR391 3,000 Speaker
speed ± 30 Hz terminal
(Load resistance:
6 ohms)
Instrument
Connection
Specified
Value
Test Tape
Adjusting
Parts
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 -4 -9
C: +3 ± 2 kHz 0 +1.5
Specified Value
IF T1
Detection T2
Band Coverage 87.4 MHz (fL): L2
108.2 MHz (fH): TC2
Tracking 88.0 MHz (fL): L1
108.0 MHz (fH): TC1
Input: Pin 1 of IC1
Output: Pin 17 of IC2
Iuput: Antenna
Output: Headphones
Socket (Load
resistance: 32 ohms)
Test Stage
Specified
Value/Adjusting Point
Instrument
Connection
• AM IF/RF
IF T3
AM Band Coverage fL: L4 (510 kHz)
(GX-CH170X) fH: TC4 (1,750 kHz)
MWBand Coverage fL: L5 (510 kHz)
(GX-CH170Z) fH: TC6 (1,650 kHz)
SW1 Band Coverage fL: L4 (2.25 MHz)
(GX-CH170Z) fH:TC4 (7.4 MHz)
SW2 Band Coverage fL: L7 (7.2 MHz)
(GX-CH170Z) fH: TC8 (22.5 MHz)
AM Tracking 600 kHz: L3
(GX-CH170X) 1,400 kHz: TC3
MW Tracking 600 kHz: L3 (MW)
(GX-CH170Z) 1,400 kHz: TC5
SW1 Tracking 2.6 MHz: L3 (SW1)
(GX-CH170Z) 6.0 MHz: TC3
SW2 Tracking 8.5 MHz: L6
(GX-CH170Z) 19 MHz: TC7
Input: Antenna
Output: Pin 19 of IC2
Input: Antenna
Output: Headphones
Socket (Load
resistance: 32 ohms)
• VCO Frequency
VR1 76 kHz ± 200 Hz Pin 13, pin 21 and
ground of IC2
Specified
Value
Instrument
Connection
Adjusting Point
Note:
After preparing the test circuit shown in Fig. 9-1, 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.
Pin 13 of IC2 Pin 21 of IC2
D
G
S
10 kohm
TO FREQUENCY
COUNTER
FET : 2SK19 or 2SK54
Figure 9-1 VCO FREQUENCY TEST CIRCUIT
(GX-CH170X)
(GX-CH170Z)
AM TRACKING
fH
AM BANDfH
fL
COVERAGE
FM
AM TRACKING fL
AM BAR ANTENNA
fH
fL
TRACKING
FM BANDfL
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
TC8
TC6
VR1
T2
L4
L2
TC5
MW/SW1 BAR ANTENNA
TC7
SW1 TRACKING fH
L5
L6
TC3
TC1
TC2
TC4
L1
L3
L7
T3
T1
IC1
IC2
VCO
FM DET
SW1 TRACKING fLMW TRACKING fL
MW TRACKING fH
fH SW2
fL TRACKING
FM fL
TRACKING fH
FM BAND fH
COVERAGE fL
fH SW1 BAND
fL COVERAGE
fL MW BAND
fH COVERAGE
fL SW2 BAND
fH COVERAGE
FM IF
AM IF
1
1
21
13
17
19
XZ
• Erase Current Check
Specified Value
Resistor for measurement: 1 ohm 50 ± 15 mV
• Playback Amplifier Sensitivity Check
Test Tape Specified Value
Instrument Connection

Sharp GX-CH170X Specifications

General

Brand	Sharp
Model	GX-CH170X
Category	Stereo System
Language	English