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From inside (document excerpt):
DR-135 / DR-235 / DR-435 Service Manual CONTENTS SPECIFICATIONS GENERAL 2 TRANSMITTER 2 RECEIVER . 2 Mechanical Parts 43 Packing Parts . 43 ACCESSORIES 43 ACCESSORIES(SCREW SET) 43 TNC(EJ41U) 44 TNC (EJ41U) Packing Parts . 45 CIRCUIT DESCRIPTION DR-135 1) Receiver System (DR-135) . 3, 4 2) Transmitter System (DR-135) . 4, 5 3) PLL Synthesizer Circuit (DR-135) . 5, 6 4) Receiver System (DR-235) . 6, 7 5) Transmitter System (DR-235) .
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7, 8 6) PLL Synthesizer Circuit (DR-235) . 8, 9 7) Receiver System (DR-435) . 9, 10 8) Transmitter System (DR-435) . 10 9) PLL Synthesizer Circuit (DR-435) . 11 10) CPU and Peripheral Circuits(DR-135 DR-235 DR-435) . 11,12 11) Power Supply Circuit . 13 12) M3826M8269GP (XA0818) . 14 16 DR-135 ADJUSTMENT 1) Adjustment Spot 46 2) VCO and RX Adjustment Specification . 47 3) Tx Adjustment Specification 47 4) Rx Test Specification . 48 5) Tx Test Specification . 49 DR-235 ADJUSTMENT 1) Adjustment Spot 50 2) VCO and RX Adjustment Specification . 51 3) Tx Adjustment Specification 51 4) Rx Test Specification . 52 5) Tx Test Specification ….. …