Page 1
COMPONENTS IDENTIFIED BY MARK ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE...
HT-R320 SPECIFICATIONS Amplifier Section Power Output: 100 W + 100 W Front L/R: 100 W Center 100 W + 100 W Surround L/R , 20 Hz~20 kHz, FTC) 230 W + 230 W (3 , Front) Dynamic Power: 170 W + 170 W (4 , Front)
Page 3
HT-R320 SERVICE PROCEDURES 1. Replacing the fuses 5. Memory Preservation This unit does not require memory preservation batteries. This symbol located near the fuse indicates that the A built-in memory power backup system preserves the contents of fuse used is show operating type, For continued protection against memory during power failures and even when the power cord is unplugged.
Page 4
HT-R320 OPERATION CHECK-1 DC VOLTAGE DETECTION PROTECTORS [NOTE1] Limit time to apply voltage is 0.5 to 1.0 seconds each channel. When protection operation does not occur at once, try several times. [NOTE2] Don't connect speakers or any load. Don't short speaker terminals.
Page 5
HT-R320 OPERATION CHECK-2 OUTPUT LEVEL & THERMAL DETECTION Regarding the power supply system of this unit. <Function> 1. High-voltage mode Usually, the power supply supplies high voltage to the power amplifier circuit when the relay (RL6901) is turned On. 2. Low-voltage mode When as follows, a power supply changes to the state of supplying low voltage when the relay (RL6901) in turned Off.
Page 6
HT-R320 OPERATION CHECK-3 OUTPUT LEVEL & THERMAL DETECTION <Check by test mode> The following is the procedure of checking detection operation of a microprocessor in false, by using test mode. OUTPUT LEVEL DETECTION 1. Set the unit to test mode " Test-3-2 "...
Page 7
HT-R320 OPERATION CHECK-4 DSP DEBUG MODE <Regarding the DSP debug mode> TIn this test mode, the check with normal communication of a microprocessor and the data of DSP and DIR is possible. This information is a help to find the cause of failure.
HT-R320 SCHEMATIC DIAGRAM-5 SPEAKER TERMINAL & POWER SUPPLY SECTION NAETC-7870 C6600 103J D6600 SPEAKER TERMINAL FRONT SPEAKERS-B RL6600 P6800 PC BOARD LSSP RSSP FRONT SPEAKERS-A RL6601 D6601 C6601 103Z RL6603 CENTER SPEAKER P6802 RL6604 D6604 C6604 103J SURROUND SPEAKERS BRLD...
Page 19
HT-R320 NAETC-7868 FLAC1 REGULATOR PC BOARD NOTE FLAC2 MPUGND THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY MPUGND REPLACE ONLY WITH PART NUMBER SPECIFIED. VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE.(NO INPUT SIGNAL). AGND ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
Page 24
HT-R320 SCHEMATIC DIAGRAM-5 SPEAKER TERMINAL & POWER SUPPLY SECTION NAETC-7870 C6600 103J NAETC-7868 D6600 SPEAKER TERMINAL FRONT SPEAKERS-B RL6600 FLAC1 P6800 REGULATOR PC BOARD NOTE FLAC2 PC BOARD MPUGND THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY MPUGND REPLACE ONLY WITH PART NUMBER SPECIFIED.
Page 25
HT-R320 ADJUSTMENT PROCEDURES IDLING CURRENT ADJUSTMENT [Note] No load and No signal Refer to Fig-1 about test points and adjustment points. 1. Before Idling adjustment, turn the trimming resistors R6040, R6041, R6042, R6043 and R6044 to counter clockwise. 2. Connect the DC voltmeter to test point P6080,P6081, P6082, P6083 and P6084.
1/30 PAGE HT-R320 EXPLODED VIEW PARTS LIST NOTE : THE COMPONENTS IDENTIFIED BY THE MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE ONLY WITH PART NUMBER SPECIFIED. REF. NO. PART NAME DESCRIPTION Q'TY PART NO. REMARKS A002...
Page 28
When replacement the following the transistor,made from the same H rank as the original type. Q6050 - Q6054, Q6060 - Q6064 HT-R320 PRINTED CIRCUIT BOARD PARTS LIST NOTE : THE COMPONENTS IDENTIFIED BY THE MARK ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
Page 43
18/30 PAGE Q6703 KTA1268-GR 2215885 PWB3 Q6703 or KTA1268-BL ( 1) 2215886 PWB3 Q6703 or 2SA992-E ( 1) 2211793 PWB3 Q6703 or 2SA992-F ( 1) 2211792 PWB3 Q6901 KTC3199-GR 2215864 PWB3 Q6901 or 2SC1740S-R ( 1) 2213284 PWB3 Q6901 or 2SC1740S-S ( 1) 2213285 PWB3...
Page 44
19/30 PAGE D6307 or DIODE 1SS270A ( 1) 223205 PWB3 D6307 or DIODE WG713A ( 1) 223222 PWB3 D6307 or DIODE 1N4148M ( 1) 223273 PWB3 D6701 DIODE 1SS133 223163 PWB3 D6701 or DIODE 1SS270A ( 1) 223205 PWB3 D6701 or DIODE WG713A ( 1) 223222...
Page 45
20/30 PAGE C6907 MY C MY92-50V-104J 371121044 PWB3 R923 CARBON R R16J-1K 417341024 PWB3 R924 METAL O R RS1/2WBJ-82 443528204 PWB3 R926 CARBON R R16J-4.7K 417344724 PWB3 R6000 CARBON R R16J-5.6K 417345624 PWB3 R6001 CARBON R R16J-5.6K 417345624 PWB3 R6002 CARBON R R16J-5.6K 417345624...
Page 46
21/30 PAGE R6103 or METAL PR MPC708-2WK-0.22 ( 1) 4500027 PWB3 R6104 CEMENT R RSS2WK-0.22 4800071 PWB3 R6104 or OTHER R RGC22-0.22 OHMK ( 1) 4000131 PWB3 R6104 or METAL PR MPC708-2WK-0.22 ( 1) 4500027 PWB3 R6140 CARBON R R16J-22K 417342234 PWB3 R6141...