Harman Kardon AVR-133

Questions and Answers

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Leah NelsonAug 19, 2025
How to troubleshoot a Harman Kardon Receiver that won't power on?
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  Timothy DelgadoAug 20, 2025
  If your Harman Kardon Receiver isn't powering on, several factors could be at play. Start by checking the AC cord to ensure it's properly connected. Then, inspect the power transformer and the fuses for any signs of disconnection. Also, verify all connectors are securely in place, changing or re-inserting them if necessary. The ST-By switch, VFD Driver I.C, and resonator should also be checked.
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Connie RichardsAug 22, 2025
Why is my Harman Kardon Receiver remote controller not working?
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  Lori BerryAug 22, 2025
  If your Harman Kardon Receiver's remote controller isn't working, start by checking the batteries. If the batteries are fine, the issue might be with the RMC I.C & Resonator, so these should be checked.
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Michael MorrisAug 25, 2025
Why does my Harman Kardon Receiver power off shortly after turning on?
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  George SchroederAug 25, 2025
  If your Harman Kardon Receiver powers off within 2-3 seconds after turning on, the issue might stem from several components. Start by checking the Regulator I.C and the Drive transistor. Inspect the protection circuit. Ensure all connectors are properly connected, changing or re-inserting them if necessary. Lastly, verify that SLEEP MODE is cancelled.
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watsonmelanieAug 26, 2025
Why is the FM function not working on my Harman Kardon AVR-133?
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  Steven NovakAug 26, 2025
  If your Harman Kardon Receiver is experiencing FM failure, check the FM MUTE adjustment, FRONT-END, and FM DET COIL. Also, check the PLL&MPX IC, including its voltage and control data. Verify the TUNER B+ voltage and the µ-COM I.C & Resonator.
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Sara NguyenAug 28, 2025
Why is the bass/treble control not working on my Harman Kardon AVR-133 Receiver?
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  Kevin FreemanAug 28, 2025
  If you're experiencing issues with the bass or treble control on your Harman Kardon Receiver, start by checking the Volume IC. Additionally, check the resistor/capacitor correction figure for both Bass and Treble.
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Lori MedinaAug 29, 2025
Why is the AM function not working on my Harman Kardon AVR-133?
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  Christopher HarrisAug 30, 2025
  If your Harman Kardon Receiver is experiencing AM failure, check the PLL&MPX IC, including its voltage and control data. Also, check the TUNER B+ voltage, AM OSC COIL, and the µ-COM I.C & Resonator.
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Deborah HollowaySep 1, 2025
What to do if the AMP sound is dead on my Harman Kardon AVR-133?
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  Luis WolfeSep 1, 2025
  If your Harman Kardon Receiver's AMP sound is dead in the left, right, center, or rear channel, check the signal mute TR and ensure connectors are properly connected. Also, make sure the speaker wires are securely inserted. Verify the volume IC and perform an I.C voltage check, looking for +(7.5)V and -(7.5)V. Finally, check the I.C control data and the I.C signal input/output.
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Scott WhiteSep 2, 2025
What causes fuse disconnection in a Harman Kardon AVR-133 Receiver after power on?
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  Todd StuartSep 3, 2025
  If the fuse in your Harman Kardon Receiver keeps disconnecting after powering on, it could be due to an inferior transformer or AMP drive TR. Check the transformer and AMP drive TR. Also, perform a voltage check, specifically looking for B+ (47)V and B- (47)V.
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Erin FrostSep 5, 2025
How do I fix AC-3/DTS failure on my Harman Kardon AVR-133 Receiver?
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  daniel28Sep 5, 2025
  If you're experiencing AC-3/DTS failure (DSP Sound Mode) on your Harman Kardon Receiver, begin by checking the I.C Regulator, DIR, and DSP. For the DIR, check the OSC, BICK, LRCK, and RDATA. For the DSP, check LRCK, Micom Interface Port and SDATA 1, 2, 3, 4. Finally, check the D/A by looking at LRCK/BCK/SDATA and the signal output.
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Dylan ChangSep 6, 2025
Why is there no tuner sound on my Harman Kardon Receiver?
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  Heather DuarteSep 6, 2025
  If your Harman Kardon Receiver's tuner sound is dead in the L/R, LEFT, or RIGHT channel, check the connectors for any disconnection. Inspect the FM DET COIL and AM IFT COIL. Also, check the PLL&MPX IC, including the signal IN/OUT terminal and the I.C driving voltage (+5V, +3V3).

Summary

SAFETY PRECAUTIONS

WARNING

Safety precautions for servicing and AC leakage current check.

BLOCK DIAGRAM

WIRING DIAGRAM

CIRCUIT DESCRIPTION

1. Pin Description

Details the pin functions of the UPD78F0536GK microcontroller.

3. Pin Functions

Lists pin names, symbols, I/O types, and descriptions for the UPD78F0536GK.

ALIGNMENT PROCEDURES

1. Electrical specification.

2. Electrical Characteristics.

TROUBLESHOOTING

SCHEMATIC DIAGRAMS

SCHEMATIC DIAGRAMS(1) PCB1(MAIN-1)

Detailed circuit diagram for the main PCB, part 1.

SCHEMATIC DIAGRAMS(2) PCB1(MAIN-2)

Detailed circuit diagram for the main PCB, part 2.

SCHEMATIC DIAGRAMS(5) PCB3(AMP)

SCHEMATIC DIAGRAMS(6) PCB4(DSP-DA787)

SCHEMATIC DIAGRAMS(7) PCB4(DSP-DIR WITH CODEC)

SCHEMATIC DIAGRAMS(8) PCB4(DSP-UB19022)

SCHEMATIC DIAGRAMS(11) TUNER ASSY

Harman Kardon AVR-133 Specifications

General

Type	AV Receiver
THD	0.07 %
Frequency Response	20 Hz - 20 kHz
Frequency Response (Alternative)	10 Hz - 100 kHz
Input Sensitivity	200 mV
Input Impedance	47 kOhms
Output Power	40 Watts per channel (8 ohms)
Signal to Noise Ratio	80dB
Tuning range	AM/FM
FM tuning range	87.5 MHz - 108 MHz
Video Connections	Composite, S-Video