PS-232 2-CHANNEL POWER SUPPLY INSTRUCTION MANUAL
2002 Clear-Com Intercom Systems All Rights Reserved Part Number 810277 Rev. A Clear-Com Intercom Systems 4065 Hollis Street Emeryville, CA 94608-3505 U.S.A Clear-Com is a registered trademark of Clear-Com Intercom Systems. The Clear-Com Logo is a registered trademark of Clear-Com Intercom Systems.
Clear-Com PS-232 Power Supply IMPORTANT SAFETY INSTRUCTIONS 1 Read these instructions. 2 Keep these instructions. 3 Heed all warnings. 4 Follow all instructions. 5 Do not use this apparatus near water. 6 Clean only with dry cloth. 7 Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. 8 Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
Clear-Com PS-232 Power Supply QUICK START 1 Unpack the unit and inspect for any damage that may have occurred in shipping. Connect the proper AC Mains cable to the outlet on the rear panel. 2 Install the PS-232. 3 Connect the intercom lines and Program Input as required. Connect the AC cord to the Mains circuit. 4 Set the two termination switches on the rear panel to ON. 5 Switch the Power ON. The green power light should be ON and the two red overload lights should be OFF.
Clear-Com PS-232 Power Supply shorts on the DC power lines to the stations, and excessive peak loads during power-on and sometimes during use. The mission of an intercom power supply is torn between giving its all to provide power in the face of these adverse conditions and protecting itself from them. This mission finds an intelligent balance in the PS-232.
Clear-Com PS-232 Power Supply MULTI-CHANNEL REMOTE STATIONS MAINTAIN THE POWER LINE ISOLATION: The RM-220, KB-211, and MR-202 as well as any two-channel remote stations or beltpacks are designed to use the isolated power provided by the PS-232. Refer to the INSTALLATION section. LOW NOISE CIRCUITRY: The direct current outputs of the PS-232 contain very little hum and noise. The PS-232 does not contribute to audible noise in the remote stations and beltpacks.
Clear-Com PS-232 Power Supply level in the line is not loud enough, increase the input level with the PROGRAM TRIM control on the rear panel. Conversely, if there is still program heard on a channel when the its level is all the way down, decrease the PROGRAM TRIM level. Any change in the PROGRAM TRIM level control on the rear panel to adjust for one channel will necessitate adjustments on the other channel to compensate. NOTE: Do not force the controls past their stop points as this will damage them.
Clear-Com PS-232 Power Supply system maximum to be exceeded. A channels which is within its maximum current rating will not be affected by the other channel being automatically cutoff. Depending upon how many shorts or overloads a channel has experienced recently, the PS-232 will attempt to turn power on again within 500 mS to 20 seconds of automatically cutting off power to an overloaded channel. This allows momentary short or overload conditions to clear automatically.
Clear-Com PS-232 Power Supply CAUTION: All intercom lines must be terminated. Care must be taken not to '"double-terminate" a line. All unused intercom lines must also be terminated. The PS-232 provides terminations for each of its two channels. Clear-Com main stations and power supplies provide switch-selectable termination networks on all intercom lines. It is up to the user to insure that the terminations are set correctly.
Clear-Com PS-232 Power Supply System Checkout Before you turn on the power: Check Termination There should be one and only one termination for each channel in the system. This termination is usually set to ON at the main station or power supply. To ascertain that only one termination is present on the channel, perform the following test: 1 Using a multimeter, measure the resistance between pins 1 and 3 on one of the Channel A XLR connectors at the rear of the unit.
Clear-Com PS-232 Power Supply MAINTENANCE Troubleshooting Tips Problem: Cause 1: Solution 1: System does not operate. No power to the PS-232. Green POWER light is not illuminated and no OVERLOAD lights are illuminated No AC power to the PS-232. Check AC connection and cable. Plug into dependable AC source. Cause 2: Solution 2: PS-232 has an internal power supply failure. Unit requires servicing.
Clear-Com PS-232 Power Supply Cause 1: Solution 1: High DC resistance in ground return. Use heavier cable; add additional conductor(s) to ground return. Cause 2: Solution 2: MULTI-CHANNEL cable pairs are not individually shielded. Replace cable with individually shield pairs. Cause 3: Solution 3: Headset cables are not wired properly or shielded properly. Correct wiring. Use headsets with properly shielded wiring. Problem: Cause: Solution: Program signal sounds distorted.
Clear-Com PS-232 Power Supply Parts List Part Description .01 uF Ceramic Disc .1 uF Monolithic 10 uF Aluminum 470 uF Aluminum 1000 uF Aluminum 1 uF Tantalum .47 uF Aluminum NP 47 pF Ceramic Disc SMD 470 pF Ceramic Disc SMD .01 uF Ceramic Disc SMD .1 uF Ceramic Disc SMD .22 uF Ceramic Disc SMD .33 uF Ceramic Disc SMD .47 uF Tantalum SMD 22 uF Aluminum SMD LED GREEN, ROUND LED LED RED, ROUND LED LED YELLOW, ROUND LED 10 OHM 1/4W Carbon Film 1K OHM 1/2W Carbon Film .18 OHM 1W Carbon Comp .
Component Layout Drawing
1 2 3 2899 REV ECO# A R34 475 Ch. A Fault (red) J1 +5V D6 R29 10.0K +5V 1 2 3 4 5 6 P5 R2 10 C2 1000uF C5 .33uF RB0 RB1 RB2 RB3 RB4 RB5 A DESCRIPTION DATE 1-11-02 Bias R48 100K C24 47pF BY JKG 7 9 R43 100K D9 BAV70 + - SER A B C D E F G H 1 .1uF C18 R42 47.5K 2 IC3 74HC165 CLK INH SH/LD 3 2 15 1 10 11 12 13 14 3 4 5 6 + 6 5 R49 50K .1uF C17 + - 7 Bias R31 100K IC4B LM833 R47 100K C20 47pF R41 47.5K R30 100K R23 10.
Clear-Com PS-232 Power Supply CLEAR-COM LIMITED WARRANTY Clear-Com products are warranted to be free from defects in materials and workmanship for a period of one year from the date of sale.
Clear-Com PS-232 Power Supply TECHNICAL SPECIFICATIONS POWER SUPPLY Type: Switching, with post filters and overload reset circuitry Output Voltage: 30 volts DC Output Current: Channel A, 1 amp continuous, 2 amps max Channel B, 1 amp continuous, 2 amps max Short Circuit Reset Time: 0.5 to 20 sec.
Clear-Com PS-232 Power Supply GLOSSARY Some of the terms used when discussing critical communications for television or theatre may be new to you as they are unique to intercom applications. Although many of the terms are common to other audio applications, to be certain you understand their meanings we offer the following definitions: All Call: Ability to push one button from the main station and talk to all channels at once on a multiple channel system.
Clear-Com PS-232 Power Supply Program Interrupt: Disconnects the audio source while the talk button on the main station is pushed. (IFB) Remote Mic Kill (RMK): The ability for certain main stations to shut off all microphones on beltpacks in a system. Remote Station: Like the beltpack, this would be any of the products connected to the intercom line that allow duplex or half-duplex conversation, but do not contain a power supply. Sidetone: This is your own voice heard in your earphone as you are speaking.
