SB-022 Service notes on TR-2200A 10-31-77 TRANSMITTER 1. No TX RF output: Bad 2SC1169 Q9 on X56-1210-11. 2. No TX: Shield plate touching to circuit board under Q8 driver 2SC741. 3. No TX: Open D2 MI301 on X5501130-01. 4. No TX: Repair broken RCT line from crystal deck to TX oscillator. 5. No TX: Bad Q13 2SA562Y. No T13 voltage on TX X56-1210-00. 6. No modulation: Bad D4 1s1658 on X56-1210-11. 7. No TX: Capacitor C21 lead touching to ground at Q4 on X56-1210-11. 8. No TX: No collector voltage to Q7 Q8. Bad Q15 2SC735 Hi/Low control for Q14 on X56-1210-11. 9. TX distortion: Check D3 Zener 9 volt supply regulator for TX low level stages on X56-1210-11. GENERAL Note On TR-2200A 1. Battery plate overheats: If the red and yellow leads of the external DC cord are connected together, the battery plate will overheat. RECEIVER 1. Receive Sensitivity poor: Bad 10.245 MHz xtal on X55-1130-11. 2. Receive Sensitivity poor: Bad MI301 D4 on X56-1080-00. 3. Receive Sensitivity poor: Bad Q1 3SK41L on X55-1130-11. 4. Bo battery operation: Miscontact of internal switch in power jack. 5. No C9 B+ to receiver: Bad Q12 2SC496 on X56-1210-11. 6. Batteries will not charge: Check for a shorted battery plate. 7. Low Rx sensitivity: Bad D3 1S2588. 8. No squelch: Check Q15 2SC458 on X55-1130-11. 9. Poor squelch when cold: Replace D14-16 1N60. 10. No audio: Bad qudio IC NPC575 Q16 on X56-1210-11. (c) 102177TKC