Kenwood TK-780 Service Manual Supplement page 52

TK-780/H
Adjustment Location
Switch
PRIORITY
BUSY/
VOLUME
TX LED
UP
SUB
VOLUME
POWER DOWN DISPLAY
MODULAR MONITOR
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-49D)
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
AUX : ON (Talk-around mode) F. conter
PTT : ON (Transmit)
2) CH : CH2 - Sig1
PTT : ON (Transmit)
52
ADJUSTMENT
AUXILIAY
MONITOR
SERVICE HANDSET
SCAN MAIL
SYSTEM UP
(Trunking Format)
GROUP UP
(Conventional Format)
SYSTEM DOWN
(Trunking Format)
GROUP DOWN
(Conventional Format)
SCAN
PROGRAMMABLE
FUNCTION KEYS
Measurement
Test-
Unit
equipment
DVM TX-RX TP1
Power meter (A/2)
Adjustment Point
VR1
TC1
PLL/VCO
TC102
TP1
Repair Jig (Chassis)
Use jig (Part No. : A10-4010-02) for repairing the TK-780/
780H. 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
TC102 1.5V
Check
TX-RX UNIT (A/2)
TC101
L6
Specifications/Remarks
Method
0.1V
8.0V or less