Sanyo CLT-99 Service Manual page 4

ADJUSTMENT
1. ALIGNMENT FOR HANDSET
NOTE : DURING ALIGNMENT, DESOLDER ANT. WIRE.
1-1. Tx / Rx VCO & Tx Frequency
Test Equipment
•
Digital Voltmeter
•
DC Power Supply (DC 3.8V)
•
Frequency Counter
Unit Condition
a) Disconnect Ni-Cd battery which feeds 3.8V from power supply terminal.
b) Set unit to "TEST" mode by shorting "TEST" point.
c) Feed 3.8V Ni-Cd battery to power supply terminal.
d) Connect frequency counter to ANT test pin. Confirm the current channel is at CH 10.
e) Connect digital voltmeter to Tx/Rx VCO terminal points.
f) Align T253 (Tx) to obtain 2.2V ± 0.1VDC reading from digital voltmeter respectively.
g) Align T153 (Rx) to obtain 1.5V ± 0.1VDC reading from digital voltmeter respectively.
... Confirm the Tx Freq. is 49.9700MHz ± 1.2kHz (CH 10) from Freq. Counter.
h) Tx Frequency
Adjustment
(FIG -1)
IC 301
Ant (H)
Frequency
Counter
Ant (E)
"TEST" Point
(TABLE -1)
STEP CONDITION
1. Tx VCO Tx VCO side
2. Rx VCO Rx VCO side
3. Tx Freq. NONE
1-2. TRANSMITTING
Test Equipment
• RF Electronic Voltmeter
• Linear Detector
• DC Power Supply (DC 3.8V)
CLT-99/SS (S/M) 6 4
(See FIG -1, TABLE -1)
Unit
Tx
Pin 6 Tx VCO
Pin 4 Rx VCO
Rx
GND
CH ADJUST ADJUSTED VALUE
10 T253 2.20V
10 T153 1.50V
10 NONE NONE
(See FIG -2, FIG -2.1, TABLE -2)
• Frequency Counter
• AF Oscillator
• Dummy Load (50 Ω)
-4-
ADJUSTMENT
Unit Condition
a) Push "FLASH" Key. The CH will turn to CH 4. Then Rx MUTE is ON.
b) Tx POWER
c) Tx MODULATION
d) Tx DATA
Adjustment (T-1)
(FIG -2)
"TEST" Point
Adjustment (T-2)
(FIG -2.1)
Digital
Oscillator
Voltmeter
Mod. : 1kHz
MIC: 10mV
(TABLE -2)
STEP
SPECIFICATION 1. Tx LEVEL
2.20V ± 0.1VDC 2. Tx Mod.
1.50V ± 0.1VDC (MIC)
49.970MHz ± 1.2kHz
3. Tx DATA
1-3. RECEIVING
Test Equipment
• FM SSG (50 Ω : OPEN TYPE)
• AC Voltmeter (AFVM)
• DC Power Supply (DC 3.0 ~ 3.8V)
Unit Condition
a) Push 'Redial' key to select Rx CH 6. The Tx frequency is 49.830MHz and Rx one is 30.200MHz.
b) Disconnect linear detector from ANTENNA test pin and connect FM SSG (1kHz Mod., 3.0kHz dev., 30.200MHz, 46dBµV) to
ANTENNA test pin.
c) Connect AFVM and distortion meter in parallel and terminate a 150
12/1/00, 3:17 PM
.... Disconnect frequency counter from ANT pin.
Connect RF electronic voltmeter to ANTENNA test pin. (50 Ω probe)
Confirm that the Tx power level is 25 ~ 65mW at RF voltmeter. (No alignment).
.... Disconnect RF electronic voltmeter from ANT test pin and connect linear detector to ANT test pin.
Inject AF oscillator (1kHz, 10mV) to microphone input.
Align VR651 to obtain 2.5 ± 0.15kHz dev. from Linear detector and check
2.1 ± 0.4kHz dev.
300Hz
3.4 ± 0.6kHz dev.
3kHz
.... After Tx Modulation Alignment. Push "TALK" key.
Check the read of linear detector 5.0 ± 1.0kHz dev.
Unit
ANT (H)
FREQ.
GND
50 Ω Dummy
Unit
ANT (H)
MIC (H)
AF
GND
GND
TEST
CONDITION CH ADJUST ADJUSTED VALUE
CARR side 4 NONE
OSC output: 1kHz 4 VR651 2.5kHz dev.
300Hz 4 NONE
3kHz 4 NONE
Press "TALK" 4 NONE
(See FIG -3, TABLE -3)
• Distortion Meter
• Digital Voltmeter
• Oscilloscope
Ω
dummy load across the speaker terminal.
-5-
RF
R Electronic
Voltmeter
Frequency
Counter
Linear
Detector
SPECIFICATION
NONE 25 ~ 65mW
2.5 ± 0.15kHz dev.
2.1 ± 0.40kHz dev.
NONE
3.4 ± 0.60kHz dev.
NONE
5.0 ± 1.00kHz dev.
NONE