Sharp SYSTEM-CD130H Service Manual page 16

OO PEMeGCU TUN
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MECHANISM SECTION
- ADJUSTMENT.
¢ Driving Force Check
Torque Meter
PLAY: TW-2412
¢ Torque Check
Specified Value
Tape 1: Over 100 g
Tape 2: Over 100 g
Specified Value
Play: TW-2111 30 to 60 g.cm 30 to 66 g.cm
Fast Forward: TW-2231
Torque Meter
Instrument
a Connection
Speaker »
termina!
(Load resistance:
6 ohms)
. Rewind: TW-2231
* Tape Speed a
NOR Bein
"Specified
_, Value:
TAPE SECTION
Position of each switch or control
Volume contro! 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: 4342 kHz
¢« Erase Current Check
Resistor for measurement: 1 ohm . 50 + 25 mV
* Playback Amplifier Sensitivity Check
[Test Tape | Specified Value | Instrument Connection
MTT-118 1.8V430B Speaker Terminal
(Load resistance: 6 ohms)
LW TRACKING fL
EM ral
TRACKING
FM BAND
COVERAGE | fL|
MW Band
--Goverage fH: TC4
TUNER SECTION
'fL: Low-range frequency
fH: High-range frequency
FM IF/RF
Test Stage _ Specified Instrument.
Value/Adjusting Connection
Point
input: Pin 1 of IC1
Ou Pn 1 7 fc
Band Coverage fL: L2 luput: Antenna
fH: TC2 Output: Headphones
Tracking 88.0MHz:L1 © —_'| Socket (Load
408.0 MHz: TC1 resistance: 32 ohms)
_* AM IF/RF
Specified
Value/Adjusting
Point
T3 Input: Antenna
Output: Pin 19 of 1C2
Input; Antenna
Output: Headphones
Socket (Load
resistance: 32 ohms)
Instrument
Connection
~ Test Stage
LW Band
Coverage
LW Tracking
fL: L5
fH: TC6
170 kHz: L3(LW)
270 kHz: TCS
MW Tracking 600 kHz: L3(MW)
1,400 kHz: TC3
¢ VCO Frequency
Adjusting Point Specified Instrument
'Value Connection
VRi '76kHz+200Hz ( | Pin 18, pin 21 and
j | ground of IC2
Note:
After preparing the test circuit shown in Fig. 16-1, 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.
Pini3 of IC2 Pin 21 of [C2
p | FET: 2SK19 or 25K54
TO FREQUENCY
COUNTER
10 kohm |
Figure 16-1 VCO FREQUENCY TEST CIRCUIT
a LW BAND
COVERAGE
TUNER PWB
Figure 16-2 ADJUSTMENT POINTS
-1
"|