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World of Ham Radio 1997
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WOHR97_AmSoft_(1997-02-01).iso
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1997-02-01
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==============================================================================
K E N W O O D
>>> A M A T E U R R A D I O S E R V I C E B U L L E T I N <<<
==============================================================================
Kenwood Service Centers
Kenwood Service Corporation Kenwood Service Center, East
2201 East Dominguez Street 829 Lynnhaven Parkway, Suite 130
Long Beach, California 90801 Virginia Beach, Virginia 23452
Telephone 1-310-639-5300 Telephone 1-804-340-1702
==============================================================================
BULLETIN # 22
MODEL: TR-2200A
SUBJECT: SERVICE NOTES
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.