Sanyo CLT-99 Service Manual page 6

ADJUSTMENT
TEST POINT LOCATION
(REMOTE CONTROL)
) PIN 4 / PIN 10 ~ PIN 5
: PIN 11 < TP001 / TP002
2. ALIGNMENT FOR BASE STATION
NOTE : DURING ALIGNMENT, DISCONNECT THE ANTENNA WIRE FROM THE SET.
2-1. Tx/Rx VCO & Tx Frequency
Test Equipment
• Digital Voltmeter
• AC Power Supply (DC 12V ... Center Minus)
• Frequency Counter
Unit Condition
a) Set unit to "TEST1" mode by shorting "TEST" point (IC401 36 pin) to ground.
b) Connect the DC power supply.
c) Connect frequency counter to CN101.
d) Set switch S401 to "PULSE" position. Tx power will be ON.
e) Confirm the current channel is at CH 10, reading from the frequency counter is 30.300MHz ± 1.2kHz.
f) Connect digital voltmeter to Tx/Rx VCO test point.
g) Align T201 (Tx) to obtain 2.5 ± 0.1VDC reading from the digital voltmeter respectively.
h) Align T103 (Rx) to obtain 1.5 ± 0.1VDC reading from the digital voltmeter respectively.
Adjustment
(FIG -4)
CN101 (H)
Frequency
Counter
CN101 (E)
CLT-99/SS (S/M) 6 6
+ PIN 6 - PIN 8 = TALK LED
, PIN 7 . PIN 9 ( PIN 36
(See FIG -4, TABLE -4)
Unit
Tx
IC301
6 pin Tx VCO
4 pin Rx
Rx VCO
GND
-8-
ADJUSTMENT
(TABLE -4)
> DIAL LED STEP
1. Tx VCO
2. Rx VCO
3. Tx Freq.
2-2. TRANSMITTING
Test Equipment
• RF Electronic Voltmeter
• Linear Detector
• AC Adaptor (DC 12V ... Centre Minus)
Unit Condition
* TEL line current 50mA at 48V
a) Press " " key, the channel will turn to CH 4. Confirm that the frequency is 30.1500MHz.
b) Slide S401 to "RINGER OFF" & S402 to "PULSE", Rx MUTE will be ON.
Disconnect frequency counter from CN101, and connect RF voltmeter to CN101 (50 Ω probe).
c) Tx POWER
; BATT. LOW LED
d) Tx MODULATION
e) Tx DATA
MODULATION
Adjustment (T-1)
(FIG -5)
Unit
CN101 (H)
CN101 (E)
(TABLE-5)
STEP
1. Tx POWER
Adjustment (T-2)
Output impedance
(FIG -5.1)
600 Ω
AF Oscillator
Freq. : 1kHz
Digital
Voltmeter
12/1/00, 3:17 PM
CONDITION CH ADJUST ADJUSTED VALUE
Tx VCO side 10 T201 2.5V
Rx VCO side 10 T103
FREQ. side 10 NONE 30.300MHz
(See FIG -5, TABLE -5, FIG -5.1, TABLE -5.1)
• Frequency Counter
• AF Oscillator
• Dummy Load (50 Ω)
.... Adjust T203 so that the reading of RF voltmeter is 300 ± 80mW.
T202 is a preset coil so no alignment is needed.
.... Connect linear detector to CN101.
Connect AF oscillator (1kHz, -20dBm) to TEL line.
Align VR601 to obtain 3.0kHz ± 0.15kHz dev. from the read of linear detector. And confirm at the AF
oscillator to TEL line .
300Hz, -20dBm: the read of linear detector is 2.2kHz ± 0.4kHz dev.
3kHz, -20dBm: the read of linear detector is 3.8kHz ± 0.6kHz dev.
.... After Tx modulation alignment, press & hold "REDIAL" key (S493).
While pushing "REDIAL" key, Tx DATA is sent.
Check the read of linear detector is 5.0kHz ± 1.0kHz dev.
RF
Electronic
R
Voltmeter
50 Ω Dummy
CONDITION CH ADJUST ADJUSTED VALUE
CARR side 4 T203 300mW
Loop Simulator
(TEL LINE)
IC301 Pin18
+
Power Supply
48VDC 50mA
-9-
SPECIFICATION
2.5V ± 0.1VDC
1.5V ± 0.1VDC
1.5V
30.300MHz ± 1.2kHz
SPECIFICATION
300mW ± 80mW
Unit
CN101 (H)
Linear
Detector
CN101 (E)
GND
–
220µF/10V