Kenwood TR-7625 Service Manual page 20

TR-7625
TROUBLESHOOTING
Little or no deflection .
Meter maifunction.
1. Check TP1 level TX-RX unit.
2. Check power supply voltage.
3. Check PLL output level.
Voltage level of
TP2 and Q101 in the
Tx-Rx unit.
No voltage
Normal
About 2.1W 1, Check whether meter lamp is lit green.
2. Confirm HI LOW switch setting.
Almost no power +. Antenna changeover diode (check D7 and D8.)
2. Check Q101, FIB, DRB terminal voltage in Rx-Tx
unit.
Check for
Hi power
1. VR4 adjustment TX-RX unit.
2. Adjustment driver and predriver stages.
No LOW POWER
1. Microphone defective or poor plug contact.
2. IC or VR defective in MIC amplifier.
3. Poor contact at VR1, VR2 in TX-RX unit.
4. Modulator circuit Power supply defective.
{check power supply.)
No sound
Insufficient or no
1. VR1, VR2 adjustment deviation in Tx-Rx unit.
2. Microphone defective.
3. Check power-is present.
4. Check Q1 voltage in Tx-Rx unit supply to modulator
circuit.
Low Mod.
20