Kenwood TK-780 Service Manual page 48

TK-780
Adjustment Location
Switch
PRIORITY
BUSY/
VOLUME
TX LED
UP
SUB
DC VOLUME
SOURCE DOWN DISPLAY
MODULAR
MIC JACK
ALPHANUMERIC
DISPLAY
Note
• Flash memory
The firmware program (User mode, Test mode, Tuning
mode, etc.) and the data programmed by the FPU (KPG-60D)
for the flash memory, is stored in memory. When parts are
changed, program the data again.
• EEPROM
The tuning data (Deviation, Squelch, etc.) for the
EEPROM, is stored in memory. When parts are changed,
readjust the transceiver.
Common Section
Item Condition
1. PLL lock 1) Set test mode
voltage CH : CH3 - Sig1
PTT : OFF (Receive)
PTT : ON (Transmit)
2) CH : CH2 - Sig1
PTT : OFF (Receive)
PTT : ON (Transmit)
48
ADJUSTMENT
AUXILIAY
MONITOR
SERVICE HANDSET
SCAN MAIL
CHANNEL UP
CHANNWL DOWN
CALL
CALL
PROGRAMMABLE
FUNCTION KEYS
Measurement
Test-
Unit
equipment
DVM TX-RX TP1
Power meter (A/2)
Adjustment Point
VR1
L202
PLL/VCO
L203
TP1
L204
TC102
Repair Jig (Chassis)
Use jig (Part No. : A10-4010-02) for repairing the TK-780.
The jig facilitates the voltage check when the voltage on the
component side TX-RX unit (A/2) is checked during repairs.
Adjustment
Terminal Unit Parts
PLL TC101 1.5V (Receive)
TC102 1.5V (Transmit)
Check
TX-RX UNIT (A/2)
TC101
L6
Specifications/Remarks
Method
± 0.1V
8.0V or less