This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed that basic service
procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by the users, and have therefore not been restated.
WARNING:Failure to follow appropriate service and safety procedures when servicing this product may result in personal injury, destruc-
tion of expensive components and failure of the product to perform as specified. For these reasons, we advise all Yamaha
product owners that all service required should be performed by an authorized Yamaha Retailer or the appointed service representative.
IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization, certification, recognition of
any applicable technical capabilities, or establish a principal-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and changes in specification are
subject to change without notice or obligation to retrofit. Should any discrepancy appear to exist, please contact the distributor’s Service Division.
WARNING:Static discharges can destroy expensive components. Discharge any static electricity your body may have accumulated by
grounding yourself to the ground bus in the unit (heavy gauge black wires connect to this bus).
IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit.
WARNING:
DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHAT SO
EVER!
Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux
vapor!
If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.
This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductive harm.
IMPORTANT NOTICE FOR THE UNITED KINGDOM
Connecting the Plug and Cord
WARNING: THIS APPARATUS MUST BE EARTHED
IMPORTANT. The wires in this mains lead are coloured in accordance with the following code:
GREEN-AND-YELLOW: EARTH
BLUE: NEUTRAL
BROWN: LIVE
As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your
plug, proceed as follows:
The wire which is coloured GREEN and YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety
earth symbol
The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.
The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.
or colored GREEN or colored GREEN and YELLOW.
■ WARNING
Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed.
8. MONO CN Circuit Board
(Time required: About 3 minutes.)
8-1. Remove the top cover. (See procedure 1)
8-2. Disconnect the connector assemblies from CN21and CN22
connectors of the MAIN circuit board. (Fig. 3)
8-3. Disconnect the fl exible fl at cable from CN23 connector of
the MAIN circuit board. (Fig. 3)
8-4. Remove the six (6) screws marked [39D]. The MONO CN
circuit board can then be removed. (Fig. 3)
9. OUT CN Circuit Board
(Time required: About 4 minutes.)
9-1. Remove the top cover. (See procedure 1).
9-2. Remove the MONO CN circuit board. (See procedure 8)
9-3. Disconnect the connector assemblies from the OUT CN
circuit board. (Fig. 3)
9-4. Remove the two (2) screws marked [34] and the two
screws marked [38]. The OUT CN circuit board can then be
removed. (Fig. 3)
[36A]: BIND HEAD TAPPING SCREW-S 3x6 MFNI33 (WR775800)
バインド S タイト
14
Fig. 4
(図4)
IMX644
11. FRONT L Circuit Board
(Time required: About 5 minutes.)
11-1. Remove the top cover. (See procedure 1)
11-2. Remove the front panel assembly. (See procedure 10)
11-3. Remove the twelve (12) knobs on the left side. (Fig. 5)
11-4. Remove the nine (9) screws marked [36B]. The FRONT L
circuit board can then be removed. (Fig. 5)
11-5. Disconnect the flexible flat cables from the FRONT L
circuit board. (Fig. 5)
12. FRONT R Circuit Board
(Time required: About 4 minutes.)
12-1. Remove the top cover. (See procedure 1)
12-2. Remove the front panel assembly. (See procedure 10)
12-3. Remove the two (2) knobs on the right side. (Fig. 5)
12-4. Remove the four (4) screws marked [36C]. The FRONT R
circuit board can then be removed. (Fig. 5)
12-5. Disconnect the fl exible fl at cable from the FRONT R circuit
[36B]: BIND HEAD TAPPING SCREW-S 3x6 MFNI33 (WR775800)
バインド S タイト
[36C]: BIND HEAD TAPPING SCREW-S 3x6 MFNI33 (WR775800)
バインド S タイト
Fig. 5
(図5)
15
IMX644
13. USB CN Circuit Board
(Time required: About 4 minutes.)
13-1. Remove the top cover. (See procedure 1)
13-2. Remove the front panel assembly. (See procedure 10)
13-3. Remove the screw marked [36D]. The USB CN circuit
board can then be removed. (Fig. 6)
14. Power Switch
(Time required: About 4 minutes.)
14-1. Remove the top cover. (See procedure 1)
14-2. Remove the front panel assembly. (See procedure 10)
14-3. Release the two (2) hooks of the power switch, and remove
the power switch together with the connector assembly and
the switch guide. (Fig. 6)
• OUT CN Circuit Board (LSA10073-01A4H) ....................28
• ST CN Circuit Board (LSA10073-01A3H) ....................26
• USB CN Circuit Board (LSA10073-01A7H) ....................26
Note: See parts list for details of circuit board component parts.
注:シートの部品詳細はパーツリストをご参照ください。
(目次)
17
IMX644
• FRONT L Circuit Board
Component side (部品側)
LOCK
MONO INPUT
to MAIN–CN91
A'
A'
B'
B'
Pattern side (パターン側)
18
2NA-WR77110
0
• FRONT L Circuit Board
IMX644
Component side (部品側)
A'
A'
to MAIN–CN92
STEREO INPUTOUTPUT
to FRONT R–CN93
B'
B'
Pattern side (パターン側)
2NA-WR77110
0
19
IMX644
r '30/53$JSDVJU#PBSE
A#$D
065165
to FRONT L–CN93
MEMORY
POWER ON/OFF
indicator
2NA-WR77080
r '64&$/$JSDVJU#PBSE
to AC INLET
0
to Power Switch
$PNQPOFOUTJEF(部品側)$PNQPOFOUTJEF(部品側)
2NA-WR77100
0
r (1*0$/$JSDVJU#PBSE
to MAIN–CN71
GPI
$PNQPOFOUTJEF(部品側)
20
2NA-WR77070
0
IMX644
r '30/53$JSDVJU#PBSE
2NA-WR77080
0
r '64&$/$JSDVJU#PBSE
1BUUFSOTJEF(パターン側)1BUUFSOTJEF(パターン側)
2NA-WR77100
0
r (1*0$/$JSDVJU#PBSE
1BUUFSOTJEF(パターン側)
2NA-WR77070
0
21
IMX644
• MAIN Circuit Board
Reduction: 17/20
The symbols “D2112, D2212, D2312, D2412, D2512 and D2612” are printed on the circuit board of the early
products and 0 Ω resistors are installed there.