Toshiba FT-7807R Service Manual page 7

RECEIVER
Test Equipment Required and Connections
• SG: RF Signal Generator, 46.770 MHz, 46.610 MHz
• VTVM
• Digital Voltmeter
SG
MOD = 1KHz
DEV = ±3kHz
DC Power Supply
3.6V
Preset
a) Turn Power on while depressing " " and "#" keys. A beep will be heard. Then the TX Mode is entered (CH21).
b) Press "4" key, then the RX ADJ Mode is entered (CH21).
Alignment Procedure
Step Preset to
1
SG: 1 mV
2 (CH21)
MOD OFF
SG: 1 mV
(CH21)
3
1 kHz ±3 kHz dev.
SG: 158 µV
(CH16)
4
1 kHz ±3 kHz dev.
SG: 3 µV
(CH16)
5
1 kHz ±3 kHz dev.
SG: 1 µV
(CH16)
6
1 kHz ±3 kHz dev.
Alignment Point Location on Main (Handset Unit) PCB
L505
L510
SP
Terminal
RF
Test Point
L504
RX VCO
Test Point
Handset Unit
RF Test
-
Point Terminal
+
Batt Terminal
RX VCO /
Discriminator
Test Point
Adjustment
Connect the digital voltmeter to the test point (RX VCO).
L505
Adjust for 1.4 V DC at CH21.
Connect the digital voltmeter to the test point (Discriminator).
L502
Adjust for 1.1 V DC at CH21.
Connect the VTVM to the speaker terminal.
RT501
Adjust for 115 mV on the VTVM (SP. OUT) at CH21.
Press the "CH" twice to change the channel to CH16.
L510
Adjust for maximum SINAD on the SINAD METER at CH16.
L510 Adjust for maximum SINAD on the SINAD meter at CH16.
L510 Adjust for maximum SINAD on the SINAD meter at CH16.
Discriminator
Test Point
L502
J502
RT501
• Dummy Load, 150-ohm
• DC Power Supply: 3.6 V
• SINAD Meter
Dummy Load
(150-ohm)
SP
Digital Voltmeter
SP Terminal
across Dummy Load
Remarks
— 6 —
VTVM
SINAD
Meter
J501
Battery
Terminal