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LA1787M
Operating Characteristics and Symbols Used in the Test Circuit Diagrams
Switches (SW)
Switch on = 1, SW off = 0
There are two switches that use signal transfer.
— SW2: switches between the mixer input and the IF input.
— SW4: switches between noise canceler input and IF output + noise canceler input.
Types of SG used
PG1 (AC1)
AC2
AC3
AC4
AC5
Used for noise canceler testing. A pulse generator and an AF oscillator are required.
Used for FM front end testing. Outputs an 83 MHz signal.
Used for FM IF, noise canceler, and MPX testing. Outputs a 10.7 MHz signal. Stereo modulation must be possible.
Used for AM testing. Outputs 1 MHz and 1.4 MHz signals.
Used with the MRC. Can also be used for AF and OSC.
Power supply
V CC
8V
V CC 1
5V
SD, stereo, seek/stop
V CC 2
V CC 3
0.1 V / 0.7 V / 2 V / 4 V
0.1 V / 0.6 V / 2 V
These levels
must be variable.
Keyed AGC, Mute ATT
HCC, SNC, SASC (MRC)
? Switches
Parameter
ON
OFF
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
SW9
SW10
AM/FM switching. The FE V CC is supplied to pin 62.
FM IF switching. Pin 51/FE output
For conversion gain testing
For switching between noise canceler input and IF output + noise canceler.
High-speed SD
SEEK/STOP (IF BUFF ON/OFF)
MUTE ATT 200 k ?
MUTE ATT 30 k ?
For pilot cancellation testing
Mute off (pin 33)
FM
FE IF OUT (A)
Conversion gain measurement (A)
AC1 (A)
High-speed SD
STOP
MUTE 200 k ?
MUTE 30 k ?
When pilot cancellation is used
MUTE OFF
AM
AC3 (B)
Other/purposes
Other/purposes
Other/purposes
Seek (IF buffer output)
OFF
OFF
When pilot cancellation is not used
MUTE ON
? Trimmers (variable resistors)
VR1
VR2
Separation adjustment
Pilot cancellation adjustment
Test Points
? DC voltages
VD1
VD2
VD3
VD4
VD5
VD6
VD7
FM RF AGC voltage
AM/FM SD, AM Tweet, FM stereo indicator
AM/FM S-meter
MRC output
Mute drive output
AM antenna damping voltage
N.C. Gate time
Pin 2
Pin 26
Pin 24
Pin 27
Pin 33
Pin 46
Pin 8
? AC voltages
VA1
VA2
VA3
VA4
VA5
AM/FM OSC Buff
First IF output
IF counter buffer
MPX OUT Left ch
MPX OUT Right ch
Pin 4
Pin 53 → CF → pin 51 load level (10.7 MHz)
Pin 23 (10.7 MHz/450 kHz)
Pin 15 (AF)
Pin 16 (AF)
No. 6655-5/54
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