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Electro-Harmonix V256 Vocoder

Symptom

I had an issue with this pedal, suspecting something wrong with the voltage regulator (actually, the issue was caused by external PSU itself).

Since I was not able to find the schematics, I opened it and decided to do a quick review of the chips.

Description of chips

Once removed all the screws and nuts, be aware the PCB is super-stiff to remove from the casing. It took me 15 minutes at least to do so.

Here are the chips I was able to identify:

IdMan Chip ref Description Used for
U1 CL CZ4272-CZZ 114 dB, 24-Bit, 192 kHz Stereo Codec DAC
U2 TI TLC2272C Dual operational amplifier
U3 No chip found with this reference
U4 AD ADSP-BF532 SBSTZ400 400 MHz High Performance Blackfin Digital Signal Processor Signal processing
U5 SJ6E
U6 No chip found with this reference
U7 TI MC33078 Dual high-speed low noise operational amplifier
U8 TI MC33078 Dual high-speed low noise operational amplifier
U9 TI MC33078 Dual high-speed low noise operational amplifier
U10 ET EM639165TS-7G 8Mega x 16 Synchronous DRAM (SDRAM) Working memory
U11 TI TPS60403DBV Unregulated 60 mA charge pump voltage inverter Signal symmetrization
U12 ON CS51413 1.5 A, 520 kHz Low Voltage Buck Regulators with External Bias or Synchronization Capability Possibly Phantom power
U13 ST 78M05 Voltage regulator Power supply
U14 NS ADC108S022 8-Channel, 50 ksps to 200 ksps, 10-Bit A/D Converter Scanning of potentiometers
U15 No chip found with this reference
U16 ST 25P10VP 1 Mbit Low Voltage Paged Flash Memory With 20 MHz Serial SPI Bus Interface Flash for main DSP
U17 NS LM3578A Switching regulator
U18 TI MC33078 Dual high-speed low noise operational amplifier
U19 TI MC33078 Dual high-speed low noise operational amplifier
U20 ON H11L1-ND Opto-isolator 5.3KV Open collector 6-DIP MIDI input
U21 TT AB45S SSR RELAY SPST-NO 200MA 0-60V Possibly Phantom power

Identification of manufacturers

Code Manufacturer
AD Analog Devices
CL Cirrus Logic
ET EtronTech
NS National Semiconductor
ON On Semiconductor
ST ST Microelectronics
TI Texas Instruments
TT Toward Technologies, Inc.
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