Amp Adjustment - Yamaha RX-Z11 Service Manual

RX-Z11/DSP-Z11
I AMP ADJUSTMENT
Perform all adjustments with no signal applied.
G Idling Current Adjustment
1. Turn all the semi-fixed variable resisters for idling
current adjustment counterclockwise fully.
2. Turn on the power to this unit and wait for 3 minutes.
3. Adjust all channels so that the voltage value at test
point is
4. Readjust all channels so that the voltage value at test
point is the same as center value of the specified
range.
G DC Offset Confirmation
After idling current adjustment, confirm that DC offset
of all channels are within the specified range.
• MAIN L P.C.B.
Item
Rear Presence L CB921 pin1-pin3
Front Presence L CB924 pin1-pin3
Surround Back L CB922 pin1-pin3
Front L CB925 pin1-pin3
Surround L CB920 pin1-pin3
ST912 ST912
VR912 VR912
CB921
DC 6 ±2 mV
Rear Presence L
86
I dling current adjustments/
Test Point Adjustment Point
VR912
VR915
VR913
VR916
VR911
DC -30 mV to +30 mV
DC -30 mV to +30 mV
DC -30 mV to +30 mV
ST913 ST913 ST917 ST917
VR915 VR915 VR913 VR913
CB924 CB922
DC 6 ±2 mV DC 8 ±4 mV
Front Presence L Surround Back L
Rating
DC 6 ±2 mV
ST912-ST915
DC 6 ±2 mV
ST913-ST915
DC 8 ±4 mV
ST917-ST915
DC 8 ±4 mV
ST918-ST915
DC 8 ±4 mV
ST919-ST915
DC -30 mV to +30 mV
DC -30 mV to +30 mV
ST915 ST915
ST918 ST918 ST919 ST919
VR916 VR916 VR911 VR911
CB925 CB920
DC 8 ±4 mV DC 8 ±4 mV
Front L Surround L
DC offset confirmations/
Test Point Rating
DC -30 mV to +30 mV
DC offset
Idling current