Harman Kardon HK680 - Controls and Functions Overview; Input Selection Controls; Volume and Tone Controls

G HK680
DISASSEMBLY PROCEDURES (REFER TO PAGES 7 AND 22)
[1] CABINET TOP (131) REMOVAL
Remove 8 screws (A) and then remove the Cabinet Top
(131).
FRONT PANEL ASS’Y (AA) REMOVAL
1. Remove the Cabinet Top (131), referring to the previous
step [1].
2. Pull out 3 Rotary Knobs (151).
3. Remove 5 screws (B) and then remove the Front Panel
Ass‘y (AA).
MAIN AMP. P.C. BOARD (PCB-1) REMOVAL
1. Remove the Front Panel Ass‘y (AA), referring to the
previous step [2].
2. Disconnect the 1 connector (CW703) from 1 connector
(CN703) on the Input Selector P.C. Board (PCB-13).
. Pull out the Rotary Knob (150) and 4 Push Buttons (146).
. Disconnect the 1 connector (CW704) from 1 connector
(CN704) on the Volume P.C. Board (PCB-11).
5. Remove 4 screws (C) and then remove the Metal Fitting
(165).
6. Disconnect the 2 connectors (CW284 and CW705) from
2 connectors (CN284 and CN705) on the Main Amp. P.C.
Board (PCB-1).
7. Remove 7 screws (D) and then remove the Main Amp.
P.C. Board (PCB-1). If necessary unsolder the lead wire.
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[4] INPUT SELECTOR P.C. BOARD (PCB-13) REMOVAL
1. Remove the Cabinet Top (131), referring to the previous
step [1].
2. Disconnect the 1 connector (CW703) from 1 connector
(CN703) on the Input Selector P.C. Board (PCB-13).
3. Disconnect the 1 connector (CW281) from 1 connector
(CN281) on the Power Supply P.C. Board (PCB-5).
4. Disconnect the 1 connector (CW704) from 1 connector
(CN704) on the Volume P.C. Board (PCB-11).
5. Disconnect the 1 connector (CW705) from 1 connector
(CN705) on the Main Amp. P.C. Board (PCB-1).
Disconnect the 2 connectors (CW701 and CW702) from
2 connectors (CN701 and CN702) on the Control P.C.
Board (PCB-12).
6. Remove 8 screws (E) and then remove Input Selector
P.C. Board (PCB-13) with Power LED P.C. Board (PCB-
15).
[5] VOLUME P.C. BOARD (PCB-11) REMOVAL
1. Remove the Front Panel Ass‘y (AA), referring to the
previous step [2].
2. Disconnect the connector (CW703) from connector
(CN703) on the Input Selector P.C. Board (PCB-13).
3. Pull out the Rotary Knob (150).
4. Disconnect the 1 connector (CW704) from 1 connector
(CN704) on the Volume P.C. Board (PCB-11).
5. Remove hexagon nut (F) and then remove the Volume
P.C. Board (PCB-11).
[6] TONE CONTROL P.C. BOARD (PCB-9) REMOVAL
1. Remove the Volume P.C. Board (PCB-11), referring to
the previous step [5].
2. Disconnect the 1 connector (CW282) from 1 connector
(CN282) on the Tone Control P.C. Board (PCB-9).
3. Disconnect the 1 connector (CW284) from 1 connector
(CN284) on the Main Amp. P.C. Board (PCB-1).
4. Disconnect the 1 connector (CW203) from 1 connector
(CN283) on the Control P.C. Board (PCB-12).
5. Pull out 2 Push Buttons (146).
6. Remove hexagon nuts (G), 3 screws (H) and then re-
move Tone Control P.C. Board (PCB-9) and Mono/
Stereo Switch P.C. Board (PCB-10).
[7] POWER SUPPLY P.C. BOARD (PCB-5) REMOVAL
1. Remove the Cabinet Top (131), referring to the previous
step [1].
2. Disconnect 2 connectors (CW3 and CW281) from 2
connectors (CN3 and CN281) on the Power Supply P.C.
Board (PCB-5).
3. Remove 2 screws (1) and then remove Power Supply
P.C. Board (PCB-5).
[8] CONTROL P.C. BOARD (PCB-12) REMOVAL
1. Remove the Main Amp. P.C. Board (PCB-1), referring to
the previous step [3].
2. Remove 7 screws (J) and then Control P.C. Board (PCB-
12).
[9] OPTION PHONO P.C. BOARD (PCB-101) REMOVAL
1. Remove the Cabinet Top (131), referring to the previous
step [1].
2. Disconnect the 1 connector (CW602) from 1 connector
(CN102) on the Main P.C. Board (PCB-1).
Disconnect the 1 connector (W601) from 1 connector
(CN101) on the Control P.C. Board (PCB-12).
3. Remove 1 screw (K) and Rivet and then remove the
Phono P.C. Board (PCB-101).