Disassembly 5-3
Revision 2 - 26 April, 2000 HP SERIES DIMMER TECHNICAL MANUAL
5.2 Output faults
If a short-circuit lamp or output cable is plugged into the dimmer, the circuit breaker will
act within milliseconds to disconnect the fault from the dimmer. In nearly all
circumstances, this is quick enough to prevent damage to the output devices.
HP12-TR:
If a triac fails, it will either turn a channel on to full (triac short-circuit), or turn it off
(triac open-circuit). If a triac fault should occur, that channel may be isolated with its
circuit breaker.
A locked-on output will usually be caused by either a faulty triac or opto-isolator. To
discover which it is, use a soldering iron to lift one end of the gate feed resistor (RT1
thru RT12) and apply power to the dimmer. If the channel is still on the triac is faulty,
otherwise the opto is faulty.
HP12-SC, HP6-C:
If an SCR fails, it will generally appear as a short, locking that channel to full. If an SCR
fails open-circuit, the other SCR will generally continue to function, and that channel will
deliver half-wave rectified waveforms to the load.
If a SCR is discovered to be faulty, replace both devices for that channel.
NOTE:
The channel LOAD LED may be used to aid in troubleshooting. This red LED serves
two functions. In normal operation, it acts as an output mimic. When the channel drive is
at zero, it indicates whether that channel’s load is disconnected (or open-circuit).
See section 2.1, item 11 for more information on load checking procedures.
5.3 Operating faults
If a message should appear scrolling across the display: “ADDRESS EXCEPTION
ERROR XXXXXXXX XXXXXXXX XXXXXXXX” where the Xs represent different
characters, write down the characters and contact JANDS Service Department or your
local JANDS Distributor, giving details of the dimmer’s operating conditions that caused
the error, and software version (see section 4.1.4.3). In the meantime, doing a Deep
Clear (see section 4.2) should get the dimmer working again.
5.4 DMX faults
The HP Dimmers feature a “Last Hold” facility that “remembers” the last received DMX
message. In the event of a DMX signal cable being unplugged or severed, the dimmers
will continue to output the “Held” DMX levels until a new DMX message is provided, or
a Snapshot, Scene or Chase function is selected.
The DMX IN LED will light if there is a DMX signal.
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