Please note that the TC1128/TC1128X as well as the TC6032 are sold in different versions:
– a +/-12dB system, "R" version
– and a +/-16dB system, "C" version

A standard TC1128 or TC1128X has +/-12dB EQ-range and can NOT communicate with a TC6032.
Latest EPROM version for the standard TC1128/X is respectively 1.23P and 1.23X
The standard TC1128/X can be upgraded to communicate with a +/-12dB "R" version TC6032 by fitting a REMPAL chip:
order code: 927QS2QR0

The TC1128 is also available in a +/-16dB EQ-range version. These TC1128 "C" versions are able to communicate with a +/-16dB "C" version TC6032.
Latest EPROM version for the +/-16dB TC1128 is respectively 1.23C and 1.23XC

It is possible to upgrade a standard +/-12dB version to a +/-16dB version by fitting a upgrade kit.
This kit requires re-calibration of the unit. Please refer to Re-adjustment procedure for LMC chips.
Order codes:
70221S2C0 1128 upgrade to 1128C (+/-16dB)

The display back light is bad:

We have used two different LCD's in the TC1128.

The first display type was an EL-type with a BLUE back light which has been unavailable for some years.
The last display type is a LED-type with a YELLOW/GREEN back light.

If your TC1128 has the old blue back light you need to get an upgrade kit (which include mechanical parts, as the new LCD doesn't fit into the old units). This upgrade kit should be installed by skilled technicians only. (TC order code for an Upgrade kit to new type of LCD Display: 702210711 ).

If your unit has the new yellow/green display you "just" need to get the display replaced. The displays cannot be fixed but needs to be replaced by a skilled technician. (TC order code for a new LCD Display, 5V type: 336050011 + a new ribbon cable for the LCD: 544033011).

Please press the UTIL button during power-on to initialize the TC1128 to the old encoder type.

Reason: The front on the TC1128 was redesigned with a new encoder type (Alps). The old design used a different encoder (Bourns).
Software version 1.23 supports both encoder types.
The new encoder type is default and thus, the TC1128 needs to be initialized by holding UTIL while powering the unit on, in order to obtain correct function of the old encoder type. The encoder function needs to be re-initialized after both a minor- and major reset of the TC1128.

If you have a unit where you need to dial "two clicks" on the encoder to jump one parameter, it means that you have got a new encoder type but either haven't updated the software to 1.23 (shown in the display at power up) or accidentally have initialized the unit to the old encoder type, in this case, please perform a minor reset of the TC1128.

Bad performance, distortion and noise not meeting specs
(with EQ flat, Inputgain at 0dB: THD+N >0,01% @0dBu and noise > -88dBu,
both measurements with 22-22kHz filter)

Answer
There has been a tendency to oscillation on IC330 and 331 due to a comlex circuit and failing chips. The Philips NE5534AN and NE5534N has big production tolerances (and maybe even failure – hasn’t been prooved) which makes the circuit oscillate.

The solution is to use New Japan Radio Co. JRC5534D (NJM5534D) in stead of Philips (Texas NE5534 is not OK to use because of an offset/gain problem).

Order code: 420021511 NJM5534D

Units with serial no. above approx. 784277 have been checked before leaving TC.

Please check RT326

Please remember that replacing RT326 requires re calibration of the 1128.
(the same as if the "LMC"-ICs (IC326-IC329) have been changed to another group no.
Click this link Re-adjustment procedure for LMC chips for instructions)

Please check RT326

Please remember that replacing RT326 requires recalibration of the 1128.
(the same as if the "LMC"-ICs (IC326-IC329) have been changed to another group no. Click Here for instructions)