Sanyo CLT-99, Service Manual

Page: 4 / 25

-5-
-4-
1. ALIGNMENT FOR HANDSET
NOTE : DURING ALIGNMENT, DESOLDER ANT. WIRE.
1-1. Tx / Rx VCO & Tx Frequency (See FIG -1, TABLE -1)
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.
h) Tx Frequency ... Confirm the Tx Freq. is 49.9700MHz
±
1.2kHz (CH 10) from Freq. Counter.
Adjustment
(FIG -1)
(TABLE -1)
1-2. TRANSMITTING (See FIG -2, FIG -2.1, TABLE -2)
Test Equipment
• RF Electronic Voltmeter • Frequency Counter
• Linear Detector • AF Oscillator
• DC Power Supply (DC 3.8V) • Dummy Load (50
Ω
)
ADJUSTMENT
Digital
Voltmeter
Frequency
Counter
GND
Pin 6 Tx VCO
Unit
Tx
Rx
Pin 4 Rx VCO
Ant (H)
Ant (E)
“TEST” Point
IC 301
STEP CONDITION CH ADJUST ADJUSTED VALUE SPECIFICATION
1. Tx VCO Tx VCO side 10 T253 2.20V 2.20V
±
0.1VDC
2. Rx VCO Rx VCO side 10 T153 1.50V 1.50V
±
0.1VDC
3. Tx Freq. NONE 10 NONE NONE 49.970MHz
±
1.2kHz
Unit Condition
a) Push “FLASH” Key. The CH will turn to CH 4. Then Rx MUTE is ON.
b) Tx POWER .... 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).
c) Tx MODULATION .... 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
300Hz
➞
2.1
±
0.4kHz dev.
3kHz ➞ 3.4
±
0.6kHz dev.
d) Tx DATA .... After Tx Modulation Alignment. Push “TALK” key.
Check the read of linear detector 5.0
±
1.0kHz dev.
Adjustment (T-1)
(FIG -2)
Adjustment (T-2)
(FIG -2.1)
ADJUSTMENT
STEP CONDITION CH ADJUST ADJUSTED VALUE SPECIFICATION
1. Tx LEVEL CARR side 4 NONE NONE 25 ~ 65mW
2. Tx Mod. OSC output: 1kHz 4 VR651 2.5kHz dev. 2.5
±
0.15kHz dev.
(MIC) 300Hz 4 NONE NONE 2.1
±
0.40kHz dev.
3kHz 4 NONE NONE 3.4
±
0.60kHz dev.
3. Tx DATA Press “TALK” 4 NONE NONE 5.0
±
1.00kHz dev.
RF
Electronic
Voltmeter
Frequency
Counter
GND
Unit
ANT (H)
“TEST” Point
50
Ω
Dummy
R
FREQ.
AF
Oscillator
Unit
TEST
MIC (H)
GND
ANT (H)
GND
Linear
Detector
Mod. : 1kHz
MIC: 10mV
(TABLE -2)
1-3. RECEIVING (See FIG -3, TABLE -3)
Test Equipment
• FM SSG (50
Ω
: OPEN TYPE) • Distortion Meter
• AC Voltmeter (AFVM) • Digital Voltmeter
• DC Power Supply (DC 3.0 ~ 3.8V) • Oscilloscope
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, 46dB
µ
V) to
ANTENNA test pin.
c) Connect AFVM and distortion meter in parallel and terminate a 150
Ω
dummy load across the speaker terminal.
CLT-99/SS (S/M) 6 12/1/00, 3:17 PM 4