Kenwood TK-390 Service Manual

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Contents

47TK-39071TERMINAL FUNCTION / KNB-17A (Ni-Cd BATTERY)T––++Discharge pin sideBreaker(80±5°C)Breaker(70±5°C)Diode ThermisterCharge pin sideKNB-17A External VIewKNB-17A SpecificationsVoltage ....................................... 7.2V (1.2V x 6)Charging current ........................ 1500mAhDimensions (mm) ...................... 58.0 W x 110.8 H x 20.0 D(Projections included)Charger and charging timeKSC-19 (Normal Charger) ...... Approx. 8 hoursKSC-20 (Rapid charger) ......... Approx. 1.3 hourWeight ....................................... 220gKNB-17A Circuit DiagramCN No. Pin No. Name I/O Function26 NC – Not use.27 KCK I Key scan IC clock data input.28 KRS I Key scan IC reset input.29 INAFC I Internal speaker switch input.30 EXAFC I External speaker switch input.31 AMPSW I Audio AMP control switch input.32 OPPTT I For optional board. (See page 22.)33 TCONT I For optional board. (See page 22.)CN2 1 AFE – Audio GND.for X57 2 AFE – Audio GND.CN3 1 Q8 O Key scan IC Q8 signal output.2 Q7 O Key scan IC Q7 signal output.3 PTTE – PTT GND.4 PTT I Normally : 5V, transmit when connected GND.5 KI1 I Key input.6 Q6 O Key scan IC Q6 signal output.CN4 1 + – BTL + output for internal speaker.2 – – BTL – output for internal speaker.CONTROL UNIT (X53-3780-XX) (B/6)CN101 1 E – GND.2 TOGGLE O Normally : 5V, switched toggle whenfor connected GND.X57 3 KI2 O Key output.4 Q6 I Key scan IC Q6 signal input.5 Q7 I Key scan IC Q7 signal input.6 CE I Chip select input for LCD driver.7 CL I Clock data input for LCD driver.8 DI I Data input for LCD driver.9 LAMP – Backlight LED control.Normally : 0V, Lighting : 7.5V10 TX LED – TX LED control.Normally : 0V, Lighting : 7.5V11 BLED – Busy LED control.Normally : 0V, Lighting : 7.5V12 5M – 5V.

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