INSTALLATION (cont'd)
Connecting the REMOTE ON/OFF Jack
As mentioned under "PA640 PANEL DESCRIPTIONS", the REMOTE ON/OFF jack allows the power to the PA640 to be turned ON and OFF by a remotely applied DC Voltage. Figs. 8 and 9 are typical applications using this feature.
Fig. 8 illustrates how a PA640 can be switched ON and OFF via the switched AC outlet on the rear of a preamplifier. When the preamplifier Power Switch is switched ON, power is applied to the DC adapter which in turn applies 4V to 30V DC to the PA640, switching it ON. Similarly, when the preamplifier is switched OFF, the DC voltage to the PA640 is removed, turning it OFF.
4V to 30V DC Adapter | 3.5mm Plug. |
plugged into a Switched | Tip must be |
AC Outlet on Preamplifier | positive (+). |
Preamplifier
POWER | REMOTE |
| ON/OFF |
®
PA640
SIX CHANNEL POWER AMPLIFIER
SYLMAR, CA | MADE IN U.S.A. |
PA640
Fig. 8 REMOTE ON/OFF Jack Connections
Fig. 9 shows two PA640's in a typical multi-room system with a Xantech ZPR68 6-zone preamp. In this case, the common +12V CO (control output) from the ZPR68 is used to remotely turn the PA640 ON/OFF.
When any one of the zones is turned on, the common +12V CO goes high, turning each of the PA640's ON.
Similarly, when the last zone is turned OFF, the +12V CO drops to 0V and turns the PA640's OFF.
TROUBLE SHOOTING
If you encounter a problem, please review the items in the following list. Be sure, in addition, to check other system components, such as preamplifiers, CD players, speakers, speaker wiring, etc., that may be at fault.
|
| PROBLEM |
| PROBABLE CAUSE AND SOLUTION |
|
| ||
|
|
|
|
|
| |||
|
|
| • Check line cord for good contact in a live AC outlet. |
|
| |||
1. | Power Indicator does not light – no sound. | • If REMOTE ON/OFF jack is used, be sure applied voltage is | ||||||
|
|
| between +4V and +30V DC with proper polarity. See Fig. 8. | |||||
2. | No sound from CH2, CH4 or CH6 when | • BRIDGED/STEREO switch is incorrectly set to BRIDGED |
|
| ||||
| stereo operation is desired. | position. Set to STEREO position. See Fig. 6. |
|
| ||||
|
|
| • Speaker load impedance is less than | |||||
3. | Sound cuts in and out every 3 to 5 seconds. | less than | ||||||
|
|
| as necessary to obtain higher impedance. |
|
| |||
4. | PA640 does not turn OFF when REMOTE | • Be sure that the POWER switch (item 8, fig. 3) is set to the | ||||||
| input voltage goes to 0 Volts. | MANUAL OFF (REMOTE ON/OFF) position. |
|
| ||||
5. | PA640 becomes very warm, shuts OFF, but | • Set POWER switch (item 8, Fig. 3) to MANUAL OFF (OUT) | ||||||
| does not come back ON automatically. | position for 15 seconds, then back ON. If REMOTE ON/OFF | ||||||
|
|
| jack is used, unplug for 15 seconds, then replug. |
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| 9 |
| |
| PA640 |
|
|
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Amplifiers & Preamplifiers