Operation, Service, and Parts Manual. This page is for informational/educational use only and comprised of archival URL information with back links.MODEL CB, CB-LE PACKAGED BOILER. Platinum360/200 Owner's Manual Platinum360/200 Wiring Diagram - Remote Control Platinum360/200 Wiring Diagram - Expert Controller RL360di/RL200di Remote Radar. AM/FM/SSB 'Export' CB Radios Service Manual Includes: PTBM125A4X/PTBM131A4X Colt 1600DX, 2000DX, HyGain 8795 (V), Lafayette 1800, Midland 7001 export, Pacific 160, Superstar 2000, Tristar 777 PCMA001S Argus 5000, Cobra 148GTL-DX (fake), Colt 2400, Falcon 2000, Lafayette 2400FM, Mongoose 2000, Nato 2000, Palomar 2400, 5000, Starfire DX.Their Sideband radios such as the 146, 148 gtl and 2000 were superb, they were stable and a radio you could be proud of.Owner's Manual. NOTE: If you have a CB-HAWKCobra has really shot themselves in the foot with this new radio, why you ask? I’m getting to that but first let me say that Cobra has been the industry leader in producing good quality CB radio’s down through the years, there was the great line of Mobil “AM” radios such as the 25LTD, 29LTD. 750-184 8/98 Printed in U.S.A. Please direct purchase orders for replacement manuals to your local Cleaver-Brooks authorized representative Manual Part No.Of course this is all history, they fixed that problem.Now we have this new radio, the 148 NW ST, It looks real pretty at night. Watt resistors throughout the whole radio, don’t know how many radios failed in the field because of this, I had several myself that had a failure of several resistors that had previously been 1/2 watt. Stock 1- Audio 2- ShieldThe first thing that happened to Cobra was that Uniden wanted to raise the price on there PC boards, Cobra did not like this so they got some other company to make there boards cheeper! The first thing that happened was that they started using 1/6 Th.
![]() Replace stock final with a 2SC1969 transistor.<-NOT OKBOTH OF THESE CHANGES WILL PRODUCE OVERDRIVEIN THE PRE-DRIVER AND DRIVER STAGES, NOT GOOD!4. Change R43 (10 Ohm) to a 2.7 Ohm. Change R76 (3.3k) to a 1k (near the mike socket) <-NOT OK AS IT MAKES THE MIC PICKUP TOO MUCH BACKGROUND NOISE.2. Most likely this voltage will not be present if this is the case, C18 has shorted and needs to be replaced. If you find that this voltage is not present, check on the opposite side of R-120 for 6.5V. Look for the collector of TR-23, you should read about 4.5 V with a dead key. The smaller the value, the more the receive is boosted.NOTE: adjust this pot with care as too much gain will SLAM your “S” meter, (This works! I’ve tried it, Peg Leg)No Audio on AM Transmit with good Carrier, This problem is more common in the “older” 2000’s but is relatively easy to fix. Modification: Change stock final to a 2SC1969 Adjust L10,L9,L8 again Change C91 to a 33uf 16volt polarized electrolytic capacitor.One, Locate pin 14 of the PLL chip, and the Positive (+) side of C-12.Two, Install a 220k ohm pot between these two points. Adjust L36,L37 for max RF outputLift the Emiter leg of TR24 and insert a 1K in series with it, to ground.Just turn up VR-4 for Max modulation, Adjust L17, L20, L21, L16 and L14 for max RF output.Modification: Change stock final to a 2SC1969 Change C71 to a 33uf 16volt polarized electrolytic capacitor.Just turn VR-5 for Max modulation, Adjust L10, L9 and L8 for max RF output. (should indicate S-9 on the meter)Found problem: R-31 is supposed to be a 47k 1/6W and it opened up to 137.5kNOTE : The new units have 1/6W resistors, the quality control is not good, this is the second example I’ve seen of this. – watt resistors )Problem :100 uV signal input did not move meter much. To prevent “future” problems, replace with a 16V unit.COBRA 29LTD RECEIVE PROBLEM ( unit with – 1/6th. Version of excel to purchase for mac-0 Hz.CH-19 LSB —- Adjust L-30 for 7.7985 Mhz. +/- 20 Hz.CH-19 USB —- Adjust CT-2 for 7.8015 Mhz. +/- 20 Hz.CH-1 LSB —- Adjust L-22 for 34.7635 Mhz. +/- 20 Hz.CH-1 USB —- Adjust L-59 for 34.7665 Mhz. Counter To TP-13 (IC-1 Pin 8)CH-19 AM — Adjust L-21 for Maximum RF (3-4vPP Typical).Adjust L-19 for 3.2 Volts DC – 2.2 Volts DC on CH-1CH-19 AM —– Adjust L-20 for Max RF (190 MvPP Typical).CH-1 AM —– Adjust L-23 for 34.7650 Mhz. Alarme Cobra Cb 200 Generator To 27Input of O-Scope to TP-17, (D-2 Cathode) Inject a 100pps,1uSec. 19, AM – Adjust L-6, L-5 and L-4 for Max output at speaker.Set output of signal generator to 27.185 AM, 1000 Hz. 19, AM – Adjust L-15, L-13 and L-3 for Max output.Ch. Output at speakerSet output of Sig Generator to 27.185 Mhz.Ch. 19, USB —- Adjust L-14, L-12, L-10, L-9, L-8 and L-7 for Max. +/- 5 Hz.Input of Frequency Counter To TP-15 (FET-1 Gate 1)Input of Frequency Counter To Antenna InputCH-1 AM — Adjust VR-5 for 26.965Mhz.Set output of Sig Generator to 27.186 Mhz.Ch. Output level 100 uV.Set output of signal generator to 27.186 USB, 1000 Hz. Set Squelch Maximum.Set output of signal generator to 27.185 AM, 1000 Hz.
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