Crestron QM-RMCRX-BA Specifications download pdf (Page 43)

Crestron QM-RMCRX-BA QuickMedia™ Receiver/Processor

QM-RMCRX-BA Troubleshooting (continued)

TROUBLE POSSIBLE

CAUSE(S)

CORRECTIVE ACTION

Incorrect cable connections. Verify 15-pin output cable connection.

Verify QM input cable connections.

Video from RGB

source is garbled

or no output.

Signal skew due to cable

length or unequal pair length.

Verify maximum QM cable length and

compensation for skew.

Poor RGB or

video image

quality.

Incorrect peak and/or boost

setting.

Adjust peak or boost controls till image

quality is improved.

Hum on audio. Grounding problem. Refer to note and diagram on page 19

for ground wire connection

instructions.

QM input connector loose or

not connected.

Verify that QM input connector is

securely plugged in.

Room output (speaker)

wire(s) loose or not

connected.

Verify that speaker wires connected to

SPEAKER connectors are secure.

Audio distorted

or not present at

room output.

Improper hookup. Verify that you are not using the

SPEAKER output and the AUDIO line

outputs at the same time.

Intermittent or no

audio/mic output.

Incorrect peak setting. Adjust peak control until audio is

restored.

System Monitor Mode

The System Monitor allows you to reload firmware into the QM-RMCRX-BA

in the event that you cannot load the firmware in the normal mode.

Perform the following procedure to correct the “System does not function”

trouble situation (in reference to Corrective Action).

If the system does not function, perform the following procedure:

1. Connect DB9 null-modem RS-232 cable between the PC and

QM-RMCRX-BA COM port B. Refer to “Hardware Hookup”

on page 17.

2. Open Toolbox and select Tools | Manage Address Book to access the

port settings.

3. In the window, select RS-232 (Connection Type), 57600 (Baud Rate),

N (Parity), 8 (Data Bits), 1 (Stop Bits), RTS/CTS On, XON/XOFF

Off, and click OK.

4. Power down the QM-RMCRX-BA.

5. While powering up the QM-RMCRX-BA, press and hold ALT+K on

the keyboard until the following text (or similar) appears in Toolbox.

System Monitor [v1.001 (0001)]

12-19-01 16:25:23 32MB RAM, 4MB FLASH

CS>

NOTE: After this, you can increase the baud rate to 115200 (for faster

communication) by pressing F8 on the keyboard and then selecting 115200 from

the “Set Baud Rate” window.

Operations Guide – DOC. 6332 QuickMedia™ Receiver/Processor: QM-RMCRX-BA • 39

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Crestron QM-RMCRX-BA Specifications Page 43

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