Regardless of how youĭo it, you will need to connect a wire bundle from the new RAM Just how you implement this is up to you. Follow me? The pads for the new IC are already present.Ĥ) To adapt to the new RAM, a few traces must be sliced.Ī) Slice the trace connecting pin 28 to pin 26ī) Slice trace connecting pin 27 to pin 23 (bottom of board)Ĭ) Slice trace connecting pin 2 to ground (bottom of board)ĥ) Install the new RAM, and connect a jumper from CPU IC501Ħ) To address the extended memory, external switches must be addedĪnd connected to the unused address lines of the new RAM. Refer to the new 28 pin IC, with pin 4 being the old IC's Notice this is a 24-pin IC, and that there are 4 extra pads Remove screws holding CPU board in front panel.Ĭarefully separate CPU board from keyboard.ģ) Locate IC505 next to CPU and remove it from the board. You will lose all current programs (Sorry!)Ģ) Remove metal shield from panel CAREFULLY! This modification is complicated, so don't try it if you're not fullyġ) Remove front panel from scanner, disconnect wiring harnesses. Parts : Hitachi HM62256LFP-12 (256Kx8 SRAM) or equivalent (flat pack required)ġ0KOhm resistor SIP (or 4 10K 1/8w resistors) Ħ400 channel memory capacity (ADVANCED TECHNICIANS ONLY!) Remove this resistor and replace it with a jumper wire. Locate resistor R228 (27 ohm) on linear board (near IC7). Much more detailed information with ascii schematic Positive when a signal is present, increasing with signal strength.Ī 1Volt full scale panel meter makes a good "S" meter Solder theĠ.1uf capacitor from the jack's center terminal to ground. The free end of this resistor to a rear panel jack (RCA). Parts : 10Kohm 1/8w resistor, 0.1 uf capacitor I foundġ00K gave me all the razor-sharpness I was looking for, without Higher the resistance, the less hysteresis will be present. Remove this resistor, and replace it with a 100-200K resistor. Resistor to get to, since it is on the bottom side of the board. Locate R152 (33K) on the linear PCB (main board). The unit now scans at around 40 channels per second. Replace CX503 (12Mhz) with a 16Mhz crystal, clip diode D503 (near D502) Only a smallĬutting plier is needed, as well as the screwdriver. This mod is so simple, you can do it in less than 3 minutes. Also the signal on the cellular phone is only a You try listening the Mobile signal, you'll only hear the signal being sent Reason is that you'll be able to hear both sides of the conversation. The System A and B Base are the ones to listen to. Turn the radio on and program the limit search memories with the ranges You will see 2 glass diodes sticking out of the PCīoard (PC-3). Looking behind the metal plate covering the front panel, look at your To enable the Radio Shack PRO-2006 scanner to monitor the cellular phoneįrequencies (870.030-879.360 System A Base) (880.650-889.980 System B Base)Īnd the actual mobile telephone frequency (825.030-834.360 System A Mobile)Īnd (835.650-844.980 System B Mobile) do the following:ġ. It is located in the upper left corner of the CPU/display board. To restore the missing CMT frequencies, merely clip diode D502. These are local copys of the mods I found on the net.
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