Sanwa Digital Proportional Radio Control System

Features

Replacing Batteries Method

For GC-2200, GC-3300 & STAC-4

1. Pull the cover toward you while pressing it downward with the thumbs, and the cover can be removed.
2. Take out the battery case inside, and place 8 pieces of UM-3 dry cells according to the polarities indicated at the bottom of the case.
3. Insert the battery case in the body in the direction in which the arrangements of the batteries in the case are visible. (If the case is obliquely inserted, insertion may not be smoothly made. Therefore, insert the case while sliding both ends of the case along the body.)
4. With the hooks on the lower part of the battery case cover applied to the corresponding parts of the body, mount the cover.

Notes for using NiCad battery

1. Disconnect the connector provided on the battery lead lines in the transmitter, and connect the NiCad battery available as option. (If you have bought the unit with NiCad battery, you need not do this work.)
2. Charge the NiCad battery. Remove the tape on the reverse lid of the transmitter and expose the charging jack. Be sure to charge it for 20 hours in the beginning before use. (The same procedures apply to the NiCad battery for the receiver.)
3. Charging for the second time and on shall be given for more than 13 hours. Irrespective of the frequency of use on the previous occasion, be sure to charge the battery for more than 13 hours. Also, in case the battery has not been used for a long period of time (more than 1 month), charge it for 20 hours as in the initial charging.
4. Observe the procedures of 2) & 3) for the charging of the transmitter only or the receiver only.
5. The NiCad battery will not be damaged by a little overcharging. However, evade excessive overcharging which will shorten the life of NiCad battery.
6. Charging with dry cell is not possible. In case of changing the battery from NiCad to a dry cell, a mistake may be avoided if a tape is stuck to the charging jack on the back lid of the transmitter.

Diagram Descriptions:

Figure 1: Illustrates the battery cover removal process by pressing downward and pulling forward. It also shows the battery case being inserted into the main body.

Figure 2: Depicts the correct placement of dry cells within the battery case, showing the positive (+) and negative (-) terminals and emphasizing the importance of not mistaking polarity.

Notes for replacing crystals

1. Mount the specified crystal without mixing up the one for the receiver and the one for the transmitter. The crystal for the transmitter is attached with a crystal case, and the one for the receiver with a drawing ribbon.
2. In case of replacing the band, be sure to change the color of the ribbon for the transmitter.
3. The flag to indicate the band of the crystal for the receiver is attached to the crystal drawing out ribbon. The crystal for the transmitter is indicated by the color of the crystal case itself.

Diagram Description:

Figure 3: Shows the process of replacing a crystal, indicating the frequency indication slot and the crystal being removed or inserted.

Three Divisional Type Servo (SM-391 & SM-392)

The proportional radio control system comprises three main components: transmitter, receiver, and servo. The servo is the most frequent component to experience troubles. Users often attempt to repair servos themselves to ensure readiness for contests. The SM-391 features a three-divisional type system for user-friendly repairs. The disassembled elements are shown in the photograph. The servo's constituent parts are packaged as units, divided into three blocks: motor, print baseplate, and gears. Lead wires connecting circuits have ample space at their soldering points on the print board, reducing the need for advanced soldering techniques. The gear part uses a cartridge system to prevent gear elements from breaking during assembly, significantly cutting down repair time. This SM-391 servo aims to enhance the radio control experience.

Diagram Description:

Figure 4: Displays the disassembled parts of the SM-391 & SM-392 servo, labeling components such as the Semi Assembled Potentiometer and Gear, Motor, Case (main body), Print Circuit BOARD, Case (bottom), Potentiometer lead, and Motor leads.

Description of Receiver and Connection Diagram

For GC-2200/GC-3300:

The receiver has connector holes at the end of the case. Insert each servo connector into the indicated hole according to the servo's function. As the receiver supports crystal replacement, you can change the frequency range by inserting the appropriate RX crystal matching the transmitter's band. To protect the crystal from vibration or poor contact, apply the rubber cap to the inlet during running or flying.

Antenna: Set the antenna at a distance of more than 5 cm from the switch or servo. For electrically driven antennas, keep them more than 10 cm away from the motor. Stretch any extra antenna line steadily and longitudinally, without cutting or bending it.

Diagram Description:

The diagram shows a receiver unit labeled "Receiver" with connections for "BATT." and "FUNC 1", "FUNC 2". It connects via wires to two servo units. A mini-battery case harness is shown, with an inset illustrating "How to lay dry cells". The inset shows four UM-3 dry cells being placed into a battery holder, indicating positive (+) and negative (-) terminals. Text states: "Dry cell: UM-3 x 4 pcs. As an option, nickel-cadmium battery is available."

Receiver and Connection Diagram

For STAC-4/STAC-6/STAC-5MX:

The receiver features connector holes at the case end. Insert each servo connector into the designated hole based on the servo's function. Since the receiver uses crystal replacement, you can select your preferred frequency band by inserting the corresponding RX crystal that matches the transmitter's band. To safeguard the crystal from damage due to vibration or improper contact, ensure the rubber cap is fitted to the inlet before operation.

Antenna: Position the antenna at least 5 cm away from the switch or servo. If using an electrically powered antenna, maintain a distance of over 10 cm from the motor. Ensure any excess antenna wire is extended straight and lengthwise, without any cuts or bends.

Diagram Description:

The diagram illustrates a receiver unit labeled "Receiver" with connections for "BATT." and "FUNC 1", "FUNC 2". It connects via wires to multiple servo units. A mini-battery case harness is depicted, with an inset showing "How to lay dry cells". The inset details the placement of four UM-3 dry cells into a battery holder, showing positive (+) and negative (-) terminals. Text confirms: "Dry cell UM-3 x 4 pcs. As an option NiCad battery is available."

Field Testing and Flight

1. After completing the installation of your radio equipment on your model, it is ready for initial field checks and test flights. It is highly recommended to use a flying site frequented by experienced R/C pilots to benefit from their expertise during these tests and the first flight. They are likely to have a better chance of successfully flying a new model.
2. Have an experienced flyer inspect your installation. They can often identify any mistakes made. Once satisfied, proceed with ground range checks. These checks are crucial for establishing the relationship between ground range and air range. Always perform these checks at the field where you intend to fly; a home check is not valid.
3. Position your model on the ground in an area clear of obstructions, allowing you to observe control surface movement as you move away from the model while manipulating a control stick. Rudder is typically the best surface to monitor due to its visibility from a distance.

Ground Range Check Procedure:

Disconnect your receiver antenna from the vertical fin and coil it into a small bundle, letting it hang from the fuselage side. This reduces the receiver's effective sensitivity. With the transmitter antenna fully collapsed and both transmitter and receiver switches turned on, begin moving a control stick. Observe which control surface moves in response. Gradually move away from the model's nose, continuously moving the stick and carefully watching the surface. At a certain point, the surface's movement will become erratic and no longer follow the stick's input. Experiment by moving the transmitter around and holding it at different angles to find the maximum controllable range. You may need to move even further away. Note this distance; it is your valid ground range.

For powered models, repeat this check with the engine running at full throttle. The distance achieved should be similar. If the distance differs by more than 10 or 15 feet, a vibration problem may exist and should be investigated before flying.

You should achieve a distance of 30 to 50 feet or more.

If these checks are satisfactory, you are ready for your first flight. REMEMBER TO REINSTALL THE RECEIVER ANTENNA TO THE TOP OF THE VERTICAL FIN.

Pre-Flight Checks: ALWAYS ENSURE THE CONTROLS ARE SET FOR PROPER DIRECTION OF MOVEMENT AND PULL OUT THE TRANSMITTER ANTENNA TO ITS FULLEST LENGTH BEFORE FLIGHT.

Have your instructor test fly the model and trim it. Once trimmed, they can begin teaching you to fly, allowing you to enjoy this great sport.

Diagram Description:

The diagram illustrates signal strength relative to distance. It shows a transmitter antenna and a model. As the distance increases, the signal strength decreases from "Strong Signal" to "Very Weak Signal". A crucial advisory states: "Never Point The Transmitter Antenna Directly At The Model During Flight".

Product Images and Manufacturer Information

The manual includes images of the various radio control units:

• GC-2200 Transmitter
• GC-3300 Transmitter
• STAC-4 Transmitter
• STAC-6 Transmitter
• STAC-5MX Transmitter

Manufacturer:

SANWA ELECTRIC CO., LTD.
12. Kuwazucho, 6-chome, Higashisumiyoshi-ku, Osaka, Japan
Phone: (06)719-1171
International Telex: 5278947
Cable Address: "SANWAPARTS OSAKA"