Sharp HT-M700H, Service Manual

Page: 8 / 112

HT-M700H
2 – 1
HT-M700H
Service Manual
CHAPTER 2.
ADJUSTMENTS
[1] Tuner section
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
NOTE:
1. Description of the “FM IF Adjustment” is not carried on this manual.
It is Because the IF coil in the FM FRONT END section has been
best adjusted in the factory so that its further adjustment is not
needed at the field. When replacing the FM FRONT END assem-
bly, no adjustment is needed either.
2. The parts in the FM FRONT END section are prepared in a com-
plate unit, so you can’t obtain each part individually.
[2] TEST Mode
Before enter TEST MODE, please do ‘PANEL DOOR OPEN POWER
OFF’: hold down ‘PANEL DOOR CLOSE’, then press ‘ON/STAND-BY’
button to turn on the power of unit.
After aboveoperation, panel door will open and enter stand-by mode
automatically.
1. TUNER TEST (“TUNER” + “STOP” + ‘ON/
STANDBY’)
INITIAL SETTINGS:
VOLUME = 20
FUNCTION = FM ST 87.50 MHz (P-01)
P-01: FM ST 87.50 MHz
P-02: FM ST 108.00 MHz
P-03: FM ST 98.00 MHz
P-04: FM ST 90.00 MHz
P-05: FM ST 106.00 MHz
P-06: AM 522 kHz
P-07: AM 1620 kHz
P-08: AM 990 kHz
P-09: AM 603 kHz
P-10: AM 1404 kHz
P-36: FM MONO 106.00 MHz
P-37: FM MONO 90.00 MHz
P-38: FM MONO 98.00 MHz
P-39: FM MONO 108.00 MHz
P-40: FM MONO 87.50 MHz
“STOP” BUTTON: TUNING DOWN
“PLAY” BUTTON: TUNING UP
“SKIP DOWN” BUTTON: TUNER PRESET DOWN
“SKIP UP” BUTTON: TUNER PRESET UP
2. VOLUME TEST (“SKIP DOWN” + “STOP” + ‘ON/
STAND-BY’)
INITIAL SETTINGS:
VOLUME = 23
FUNCTION = AUX DISITAL
FM ST FREQUENCY = 87.50 MHz
FM MONO FREQUENCY = 87.50 MHz
AM FREQUENCY = 522 kHz
VOLUME 0 >> VOLUME 1 >> VOLUME 23 >> VOLUME 40 >> VOL-
UME MAX
3. KEY TEST (“SKIP UP” + “PLAY” + ‘ON/STANDBY’)
Press each button of main unit except “ON/STAND-BY” button, and
then press “ON/STAND-BY” button.
KEY OK: ‘OK’ SHOWN ON VFD
KEY NG: ‘ERROR’ SHOWN OF VFD
Every press of key, VFD will display name of pressed button.
4. VFD TEST (“SKIP UP” + “STOP” + ‘ON/STANDBY’)
Use “SKIP UP” button to change VFD display mode.
Test
Stage
Frequency Frequency
Display
Setting/
Adjusting
Point
Instrument
Connection
AM IF 450 kHz 1,620 kHz T351 *1
AM Band
Coverage – 522 kHz (fL): T306
1.1
±
0.1 V
*2
AM
Tracking 990 kHz 990 kHz (fL): T302 *1
*1. Input: Antenna Output: TP302
*2. Input: Antenna Output: TP301
Figure 1 Adjustment Points
SO302
AM
ANTENNA
TERMINAL
IC301
SO301
FM
ANTENNA
TERMINAL
VR351 T351
T306 T302
TUNER PWB
VCO AM IF
AM BAND
COVERANGE fL AM
TORACKING fL