DOWNLOAD Harman Kardon HK 3770 (serv.man8) Service Manual ↓ Size: 13.19 MB | Pages: 120 in PDF or view online for FREE

Model
HK 3770 (serv.man8)
Pages
120
Size
13.19 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
hk-3770-sm8.pdf
Date
PREV: Harman Kardon HK 3770 (serv.man7) EMC - CB Certificate

Harman Kardon HK 3770 (serv.man8) Service Manual ▷ View online

Harman Kardon
HK 3770 Service Manual
Page 13 of 120
AMPLIFIER SECTION BIAS ADJUSTMENT
Measurement condition
.No input signal or volume position is minium.
.Do not adjust at FM/AM.
Standard value 
.Ideal current = 48mA (±7%)
.Ideal DC Voltage = 22.5mA (±7%)
  ( AMP PCB )
CN51
CN41
DC VOLTMETER : Connect to
CN51 ( L-CH), CN41 ( R-CH)
No.
Channel
Adjust for 
Adjust
1
Left
22.5mV(±7%)
CN51
2
Right
22.5mV(±7%)
CN41
VR203
VR204
Harman Kardon
HK 3770 Service Manual
Page 14 of 120
[ HK3700/3770 Reset Procedure ]
1. Standby mode.
2. Press the Tun mode key for a few seconds.
3. VFD will show as below.
4. Complete reset.
Harman Kardon
HK 3770 Service Manual
Page 15 of 120
[HK3700 Firmware Upgrade Instructions]
1.
Copy the latest firmware files(*.fw and *.ve) to a USB stick's root directory.
2.
Plug a USB stick into the front panel.
3.
Power ON by using the remote control or the set button.
4.
After 30 seconds, press 'STEREO' key and 1,7,1,8 + 'ok' buttons on R/C.
Followings will be shown on the VFD.
VFD 1st line : SYSTEM UPGRADE
VFD 2nd line : Searching..
5.
After USB searching, Venice upgrade begins.
Followings will be shown on the VFD.
VFD 1st line : VENICE UPDATE
VFD 2nd line : [Updating %]
It takes about 6~8 minutes to upgrade the firmware.
Harman Kardon
HK 3770 Service Manual
Page 16 of 120
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