Sharp RG-375H Serviceanleitung Seite 10

G-375H(BK)
SETTING POSITION
• Dolby NR Switch:
OF SWITCH AND
• Tape selector switch: Normal
KNOB
ITEM INPUT
Test tape
PLAYBACK AMPLI-
FIER SENSITIVITY MTT-150
AM (MW/LW) IF/RF ADJUSTMENT
SIGNAL
400 Hz, 30%, AM modulated
GENERATOR
TEST FRE-
STEP
STAGE QUENCY
AM (MW) IF (Set •the band selector switch to AM (MW) position.)
1 452 kHz
AM (MW) RF
2 510 kHz
Band
coverage
3 1,650 kHz
Repeat steps 2, 3 until no further
4
be made.
1,400 kHz
5 Tracking
Repeat step 5 until
6
LW RF (Set the band selector switch to LW position.)
7 145 kHz
Band
coverage 310 kHz
8
Repeat steps 7. 8 until no further
9
10 Tracking 260 kHz
Repeat step 10 until no further
11
Figure 10—4 AM "IF"
CIRCUIT ADJUSTMENT
Off
ADJUSTMENT REMARKS
(CHECK)
POINT
L: VR501 Normal:
R: VR502 580 mV
CIRCUIT ADJUSTMENT
DIAL
ADJUST-
POINTER REMARKS
MENT
SETTING
High T203 Adjust for best
Frequency •'IF"
T205
Lowest
Adjust for
frequency
maximal
TC204
Highest
output.
F requency
improvement
1,400 kHz TC201. Adjust for
TC202 maximal
output.
no further improvement can be made.
RG-375H Only
Lowest T204
Adjust for
frequency
maximal
Highest TC203
output.
frequency
improvement can be made.
260 kHz T201. Adjust for
T202 maximal
output.
improvement can be made.
CURVE
(AUDIO
Record/Playback
Head
Test Tape
MTT.150
Figure 10—1 PLAYBACK
(TUNER
Signal
Generator
Dummy
o
Figure 10—2 AM(MW/LW)
curve.
T 101
S VRIOI
can
0
T201
T20å_a T202
0
VR501
Figure 10—3 ADJUSTMENT POINTS
— 10 —
SECTION)
Electronic
Voltmeter
TP601 or
Playback Mode TP602
unit
GND
SENSITIVITY
SECTION)
To Antenna Socket
R = 80—Z (ohms) Z: Output
impedance of signal generator
65pF
To Chassis GND
R F: T P2
Antenna Socket IF: SpeakerSocket
unit
GND
GND
IF/RF
VR402
TP3
TP2
IC401
LIOI
VR401
TC203
T 204 T205 TC204
MAIN PWB
OT901
TC901
LEFT SIDE VIEW
o
VR502
Oscilloscope
0
0
Electronic
Voltmeter
o
TC201
TP601
ICSOI
G)c623